aiplatform/apiv1/metadata_client.go

// Copyright 2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Code generated by protoc-gen-go_gapic. DO NOT EDIT.

package aiplatform

import (
	"context"
	"fmt"
	"math"
	"net/url"

	aiplatformpb "cloud.google.com/go/aiplatform/apiv1/aiplatformpb"
	iampb "cloud.google.com/go/iam/apiv1/iampb"
	"cloud.google.com/go/longrunning"
	lroauto "cloud.google.com/go/longrunning/autogen"
	longrunningpb "cloud.google.com/go/longrunning/autogen/longrunningpb"
	gax "github.com/googleapis/gax-go/v2"
	"google.golang.org/api/iterator"
	"google.golang.org/api/option"
	"google.golang.org/api/option/internaloption"
	gtransport "google.golang.org/api/transport/grpc"
	locationpb "google.golang.org/genproto/googleapis/cloud/location"
	"google.golang.org/grpc"
	"google.golang.org/protobuf/proto"
)

var newMetadataClientHook clientHook

// MetadataCallOptions contains the retry settings for each method of MetadataClient.
type MetadataCallOptions struct {
	CreateMetadataStore              []gax.CallOption
	GetMetadataStore                 []gax.CallOption
	ListMetadataStores               []gax.CallOption
	DeleteMetadataStore              []gax.CallOption
	CreateArtifact                   []gax.CallOption
	GetArtifact                      []gax.CallOption
	ListArtifacts                    []gax.CallOption
	UpdateArtifact                   []gax.CallOption
	DeleteArtifact                   []gax.CallOption
	PurgeArtifacts                   []gax.CallOption
	CreateContext                    []gax.CallOption
	GetContext                       []gax.CallOption
	ListContexts                     []gax.CallOption
	UpdateContext                    []gax.CallOption
	DeleteContext                    []gax.CallOption
	PurgeContexts                    []gax.CallOption
	AddContextArtifactsAndExecutions []gax.CallOption
	AddContextChildren               []gax.CallOption
	RemoveContextChildren            []gax.CallOption
	QueryContextLineageSubgraph      []gax.CallOption
	CreateExecution                  []gax.CallOption
	GetExecution                     []gax.CallOption
	ListExecutions                   []gax.CallOption
	UpdateExecution                  []gax.CallOption
	DeleteExecution                  []gax.CallOption
	PurgeExecutions                  []gax.CallOption
	AddExecutionEvents               []gax.CallOption
	QueryExecutionInputsAndOutputs   []gax.CallOption
	CreateMetadataSchema             []gax.CallOption
	GetMetadataSchema                []gax.CallOption
	ListMetadataSchemas              []gax.CallOption
	QueryArtifactLineageSubgraph     []gax.CallOption
	GetLocation                      []gax.CallOption
	ListLocations                    []gax.CallOption
	GetIamPolicy                     []gax.CallOption
	SetIamPolicy                     []gax.CallOption
	TestIamPermissions               []gax.CallOption
	CancelOperation                  []gax.CallOption
	DeleteOperation                  []gax.CallOption
	GetOperation                     []gax.CallOption
	ListOperations                   []gax.CallOption
	WaitOperation                    []gax.CallOption
}

func defaultMetadataGRPCClientOptions() []option.ClientOption {
	return []option.ClientOption{
		internaloption.WithDefaultEndpoint("aiplatform.googleapis.com:443"),
		internaloption.WithDefaultEndpointTemplate("aiplatform.UNIVERSE_DOMAIN:443"),
		internaloption.WithDefaultMTLSEndpoint("aiplatform.mtls.googleapis.com:443"),
		internaloption.WithDefaultUniverseDomain("googleapis.com"),
		internaloption.WithDefaultAudience("https://aiplatform.googleapis.com/"),
		internaloption.WithDefaultScopes(DefaultAuthScopes()...),
		internaloption.EnableJwtWithScope(),
		option.WithGRPCDialOption(grpc.WithDefaultCallOptions(
			grpc.MaxCallRecvMsgSize(math.MaxInt32))),
	}
}

func defaultMetadataCallOptions() *MetadataCallOptions {
	return &MetadataCallOptions{
		CreateMetadataStore:              []gax.CallOption{},
		GetMetadataStore:                 []gax.CallOption{},
		ListMetadataStores:               []gax.CallOption{},
		DeleteMetadataStore:              []gax.CallOption{},
		CreateArtifact:                   []gax.CallOption{},
		GetArtifact:                      []gax.CallOption{},
		ListArtifacts:                    []gax.CallOption{},
		UpdateArtifact:                   []gax.CallOption{},
		DeleteArtifact:                   []gax.CallOption{},
		PurgeArtifacts:                   []gax.CallOption{},
		CreateContext:                    []gax.CallOption{},
		GetContext:                       []gax.CallOption{},
		ListContexts:                     []gax.CallOption{},
		UpdateContext:                    []gax.CallOption{},
		DeleteContext:                    []gax.CallOption{},
		PurgeContexts:                    []gax.CallOption{},
		AddContextArtifactsAndExecutions: []gax.CallOption{},
		AddContextChildren:               []gax.CallOption{},
		RemoveContextChildren:            []gax.CallOption{},
		QueryContextLineageSubgraph:      []gax.CallOption{},
		CreateExecution:                  []gax.CallOption{},
		GetExecution:                     []gax.CallOption{},
		ListExecutions:                   []gax.CallOption{},
		UpdateExecution:                  []gax.CallOption{},
		DeleteExecution:                  []gax.CallOption{},
		PurgeExecutions:                  []gax.CallOption{},
		AddExecutionEvents:               []gax.CallOption{},
		QueryExecutionInputsAndOutputs:   []gax.CallOption{},
		CreateMetadataSchema:             []gax.CallOption{},
		GetMetadataSchema:                []gax.CallOption{},
		ListMetadataSchemas:              []gax.CallOption{},
		QueryArtifactLineageSubgraph:     []gax.CallOption{},
		GetLocation:                      []gax.CallOption{},
		ListLocations:                    []gax.CallOption{},
		GetIamPolicy:                     []gax.CallOption{},
		SetIamPolicy:                     []gax.CallOption{},
		TestIamPermissions:               []gax.CallOption{},
		CancelOperation:                  []gax.CallOption{},
		DeleteOperation:                  []gax.CallOption{},
		GetOperation:                     []gax.CallOption{},
		ListOperations:                   []gax.CallOption{},
		WaitOperation:                    []gax.CallOption{},
	}
}

// internalMetadataClient is an interface that defines the methods available from Vertex AI API.
type internalMetadataClient interface {
	Close() error
	setGoogleClientInfo(...string)
	Connection() *grpc.ClientConn
	CreateMetadataStore(context.Context, *aiplatformpb.CreateMetadataStoreRequest, ...gax.CallOption) (*CreateMetadataStoreOperation, error)
	CreateMetadataStoreOperation(name string) *CreateMetadataStoreOperation
	GetMetadataStore(context.Context, *aiplatformpb.GetMetadataStoreRequest, ...gax.CallOption) (*aiplatformpb.MetadataStore, error)
	ListMetadataStores(context.Context, *aiplatformpb.ListMetadataStoresRequest, ...gax.CallOption) *MetadataStoreIterator
	DeleteMetadataStore(context.Context, *aiplatformpb.DeleteMetadataStoreRequest, ...gax.CallOption) (*DeleteMetadataStoreOperation, error)
	DeleteMetadataStoreOperation(name string) *DeleteMetadataStoreOperation
	CreateArtifact(context.Context, *aiplatformpb.CreateArtifactRequest, ...gax.CallOption) (*aiplatformpb.Artifact, error)
	GetArtifact(context.Context, *aiplatformpb.GetArtifactRequest, ...gax.CallOption) (*aiplatformpb.Artifact, error)
	ListArtifacts(context.Context, *aiplatformpb.ListArtifactsRequest, ...gax.CallOption) *ArtifactIterator
	UpdateArtifact(context.Context, *aiplatformpb.UpdateArtifactRequest, ...gax.CallOption) (*aiplatformpb.Artifact, error)
	DeleteArtifact(context.Context, *aiplatformpb.DeleteArtifactRequest, ...gax.CallOption) (*DeleteArtifactOperation, error)
	DeleteArtifactOperation(name string) *DeleteArtifactOperation
	PurgeArtifacts(context.Context, *aiplatformpb.PurgeArtifactsRequest, ...gax.CallOption) (*PurgeArtifactsOperation, error)
	PurgeArtifactsOperation(name string) *PurgeArtifactsOperation
	CreateContext(context.Context, *aiplatformpb.CreateContextRequest, ...gax.CallOption) (*aiplatformpb.Context, error)
	GetContext(context.Context, *aiplatformpb.GetContextRequest, ...gax.CallOption) (*aiplatformpb.Context, error)
	ListContexts(context.Context, *aiplatformpb.ListContextsRequest, ...gax.CallOption) *ContextIterator
	UpdateContext(context.Context, *aiplatformpb.UpdateContextRequest, ...gax.CallOption) (*aiplatformpb.Context, error)
	DeleteContext(context.Context, *aiplatformpb.DeleteContextRequest, ...gax.CallOption) (*DeleteContextOperation, error)
	DeleteContextOperation(name string) *DeleteContextOperation
	PurgeContexts(context.Context, *aiplatformpb.PurgeContextsRequest, ...gax.CallOption) (*PurgeContextsOperation, error)
	PurgeContextsOperation(name string) *PurgeContextsOperation
	AddContextArtifactsAndExecutions(context.Context, *aiplatformpb.AddContextArtifactsAndExecutionsRequest, ...gax.CallOption) (*aiplatformpb.AddContextArtifactsAndExecutionsResponse, error)
	AddContextChildren(context.Context, *aiplatformpb.AddContextChildrenRequest, ...gax.CallOption) (*aiplatformpb.AddContextChildrenResponse, error)
	RemoveContextChildren(context.Context, *aiplatformpb.RemoveContextChildrenRequest, ...gax.CallOption) (*aiplatformpb.RemoveContextChildrenResponse, error)
	QueryContextLineageSubgraph(context.Context, *aiplatformpb.QueryContextLineageSubgraphRequest, ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error)
	CreateExecution(context.Context, *aiplatformpb.CreateExecutionRequest, ...gax.CallOption) (*aiplatformpb.Execution, error)
	GetExecution(context.Context, *aiplatformpb.GetExecutionRequest, ...gax.CallOption) (*aiplatformpb.Execution, error)
	ListExecutions(context.Context, *aiplatformpb.ListExecutionsRequest, ...gax.CallOption) *ExecutionIterator
	UpdateExecution(context.Context, *aiplatformpb.UpdateExecutionRequest, ...gax.CallOption) (*aiplatformpb.Execution, error)
	DeleteExecution(context.Context, *aiplatformpb.DeleteExecutionRequest, ...gax.CallOption) (*DeleteExecutionOperation, error)
	DeleteExecutionOperation(name string) *DeleteExecutionOperation
	PurgeExecutions(context.Context, *aiplatformpb.PurgeExecutionsRequest, ...gax.CallOption) (*PurgeExecutionsOperation, error)
	PurgeExecutionsOperation(name string) *PurgeExecutionsOperation
	AddExecutionEvents(context.Context, *aiplatformpb.AddExecutionEventsRequest, ...gax.CallOption) (*aiplatformpb.AddExecutionEventsResponse, error)
	QueryExecutionInputsAndOutputs(context.Context, *aiplatformpb.QueryExecutionInputsAndOutputsRequest, ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error)
	CreateMetadataSchema(context.Context, *aiplatformpb.CreateMetadataSchemaRequest, ...gax.CallOption) (*aiplatformpb.MetadataSchema, error)
	GetMetadataSchema(context.Context, *aiplatformpb.GetMetadataSchemaRequest, ...gax.CallOption) (*aiplatformpb.MetadataSchema, error)
	ListMetadataSchemas(context.Context, *aiplatformpb.ListMetadataSchemasRequest, ...gax.CallOption) *MetadataSchemaIterator
	QueryArtifactLineageSubgraph(context.Context, *aiplatformpb.QueryArtifactLineageSubgraphRequest, ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error)
	GetLocation(context.Context, *locationpb.GetLocationRequest, ...gax.CallOption) (*locationpb.Location, error)
	ListLocations(context.Context, *locationpb.ListLocationsRequest, ...gax.CallOption) *LocationIterator
	GetIamPolicy(context.Context, *iampb.GetIamPolicyRequest, ...gax.CallOption) (*iampb.Policy, error)
	SetIamPolicy(context.Context, *iampb.SetIamPolicyRequest, ...gax.CallOption) (*iampb.Policy, error)
	TestIamPermissions(context.Context, *iampb.TestIamPermissionsRequest, ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error)
	CancelOperation(context.Context, *longrunningpb.CancelOperationRequest, ...gax.CallOption) error
	DeleteOperation(context.Context, *longrunningpb.DeleteOperationRequest, ...gax.CallOption) error
	GetOperation(context.Context, *longrunningpb.GetOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
	ListOperations(context.Context, *longrunningpb.ListOperationsRequest, ...gax.CallOption) *OperationIterator
	WaitOperation(context.Context, *longrunningpb.WaitOperationRequest, ...gax.CallOption) (*longrunningpb.Operation, error)
}

// MetadataClient is a client for interacting with Vertex AI API.
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
//
// Service for reading and writing metadata entries.
type MetadataClient struct {
	// The internal transport-dependent client.
	internalClient internalMetadataClient

	// The call options for this service.
	CallOptions *MetadataCallOptions

	// LROClient is used internally to handle long-running operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient *lroauto.OperationsClient
}

// Wrapper methods routed to the internal client.

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *MetadataClient) Close() error {
	return c.internalClient.Close()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *MetadataClient) setGoogleClientInfo(keyval ...string) {
	c.internalClient.setGoogleClientInfo(keyval...)
}

// Connection returns a connection to the API service.
//
// Deprecated: Connections are now pooled so this method does not always
// return the same resource.
func (c *MetadataClient) Connection() *grpc.ClientConn {
	return c.internalClient.Connection()
}

// CreateMetadataStore initializes a MetadataStore, including allocation of resources.
func (c *MetadataClient) CreateMetadataStore(ctx context.Context, req *aiplatformpb.CreateMetadataStoreRequest, opts ...gax.CallOption) (*CreateMetadataStoreOperation, error) {
	return c.internalClient.CreateMetadataStore(ctx, req, opts...)
}

// CreateMetadataStoreOperation returns a new CreateMetadataStoreOperation from a given name.
// The name must be that of a previously created CreateMetadataStoreOperation, possibly from a different process.
func (c *MetadataClient) CreateMetadataStoreOperation(name string) *CreateMetadataStoreOperation {
	return c.internalClient.CreateMetadataStoreOperation(name)
}

// GetMetadataStore retrieves a specific MetadataStore.
func (c *MetadataClient) GetMetadataStore(ctx context.Context, req *aiplatformpb.GetMetadataStoreRequest, opts ...gax.CallOption) (*aiplatformpb.MetadataStore, error) {
	return c.internalClient.GetMetadataStore(ctx, req, opts...)
}

// ListMetadataStores lists MetadataStores for a Location.
func (c *MetadataClient) ListMetadataStores(ctx context.Context, req *aiplatformpb.ListMetadataStoresRequest, opts ...gax.CallOption) *MetadataStoreIterator {
	return c.internalClient.ListMetadataStores(ctx, req, opts...)
}

// DeleteMetadataStore deletes a single MetadataStore and all its child resources (Artifacts,
// Executions, and Contexts).
func (c *MetadataClient) DeleteMetadataStore(ctx context.Context, req *aiplatformpb.DeleteMetadataStoreRequest, opts ...gax.CallOption) (*DeleteMetadataStoreOperation, error) {
	return c.internalClient.DeleteMetadataStore(ctx, req, opts...)
}

// DeleteMetadataStoreOperation returns a new DeleteMetadataStoreOperation from a given name.
// The name must be that of a previously created DeleteMetadataStoreOperation, possibly from a different process.
func (c *MetadataClient) DeleteMetadataStoreOperation(name string) *DeleteMetadataStoreOperation {
	return c.internalClient.DeleteMetadataStoreOperation(name)
}

// CreateArtifact creates an Artifact associated with a MetadataStore.
func (c *MetadataClient) CreateArtifact(ctx context.Context, req *aiplatformpb.CreateArtifactRequest, opts ...gax.CallOption) (*aiplatformpb.Artifact, error) {
	return c.internalClient.CreateArtifact(ctx, req, opts...)
}

// GetArtifact retrieves a specific Artifact.
func (c *MetadataClient) GetArtifact(ctx context.Context, req *aiplatformpb.GetArtifactRequest, opts ...gax.CallOption) (*aiplatformpb.Artifact, error) {
	return c.internalClient.GetArtifact(ctx, req, opts...)
}

// ListArtifacts lists Artifacts in the MetadataStore.
func (c *MetadataClient) ListArtifacts(ctx context.Context, req *aiplatformpb.ListArtifactsRequest, opts ...gax.CallOption) *ArtifactIterator {
	return c.internalClient.ListArtifacts(ctx, req, opts...)
}

// UpdateArtifact updates a stored Artifact.
func (c *MetadataClient) UpdateArtifact(ctx context.Context, req *aiplatformpb.UpdateArtifactRequest, opts ...gax.CallOption) (*aiplatformpb.Artifact, error) {
	return c.internalClient.UpdateArtifact(ctx, req, opts...)
}

// DeleteArtifact deletes an Artifact.
func (c *MetadataClient) DeleteArtifact(ctx context.Context, req *aiplatformpb.DeleteArtifactRequest, opts ...gax.CallOption) (*DeleteArtifactOperation, error) {
	return c.internalClient.DeleteArtifact(ctx, req, opts...)
}

// DeleteArtifactOperation returns a new DeleteArtifactOperation from a given name.
// The name must be that of a previously created DeleteArtifactOperation, possibly from a different process.
func (c *MetadataClient) DeleteArtifactOperation(name string) *DeleteArtifactOperation {
	return c.internalClient.DeleteArtifactOperation(name)
}

// PurgeArtifacts purges Artifacts.
func (c *MetadataClient) PurgeArtifacts(ctx context.Context, req *aiplatformpb.PurgeArtifactsRequest, opts ...gax.CallOption) (*PurgeArtifactsOperation, error) {
	return c.internalClient.PurgeArtifacts(ctx, req, opts...)
}

// PurgeArtifactsOperation returns a new PurgeArtifactsOperation from a given name.
// The name must be that of a previously created PurgeArtifactsOperation, possibly from a different process.
func (c *MetadataClient) PurgeArtifactsOperation(name string) *PurgeArtifactsOperation {
	return c.internalClient.PurgeArtifactsOperation(name)
}

// CreateContext creates a Context associated with a MetadataStore.
func (c *MetadataClient) CreateContext(ctx context.Context, req *aiplatformpb.CreateContextRequest, opts ...gax.CallOption) (*aiplatformpb.Context, error) {
	return c.internalClient.CreateContext(ctx, req, opts...)
}

// GetContext retrieves a specific Context.
func (c *MetadataClient) GetContext(ctx context.Context, req *aiplatformpb.GetContextRequest, opts ...gax.CallOption) (*aiplatformpb.Context, error) {
	return c.internalClient.GetContext(ctx, req, opts...)
}

// ListContexts lists Contexts on the MetadataStore.
func (c *MetadataClient) ListContexts(ctx context.Context, req *aiplatformpb.ListContextsRequest, opts ...gax.CallOption) *ContextIterator {
	return c.internalClient.ListContexts(ctx, req, opts...)
}

// UpdateContext updates a stored Context.
func (c *MetadataClient) UpdateContext(ctx context.Context, req *aiplatformpb.UpdateContextRequest, opts ...gax.CallOption) (*aiplatformpb.Context, error) {
	return c.internalClient.UpdateContext(ctx, req, opts...)
}

// DeleteContext deletes a stored Context.
func (c *MetadataClient) DeleteContext(ctx context.Context, req *aiplatformpb.DeleteContextRequest, opts ...gax.CallOption) (*DeleteContextOperation, error) {
	return c.internalClient.DeleteContext(ctx, req, opts...)
}

// DeleteContextOperation returns a new DeleteContextOperation from a given name.
// The name must be that of a previously created DeleteContextOperation, possibly from a different process.
func (c *MetadataClient) DeleteContextOperation(name string) *DeleteContextOperation {
	return c.internalClient.DeleteContextOperation(name)
}

// PurgeContexts purges Contexts.
func (c *MetadataClient) PurgeContexts(ctx context.Context, req *aiplatformpb.PurgeContextsRequest, opts ...gax.CallOption) (*PurgeContextsOperation, error) {
	return c.internalClient.PurgeContexts(ctx, req, opts...)
}

// PurgeContextsOperation returns a new PurgeContextsOperation from a given name.
// The name must be that of a previously created PurgeContextsOperation, possibly from a different process.
func (c *MetadataClient) PurgeContextsOperation(name string) *PurgeContextsOperation {
	return c.internalClient.PurgeContextsOperation(name)
}

// AddContextArtifactsAndExecutions adds a set of Artifacts and Executions to a Context. If any of the
// Artifacts or Executions have already been added to a Context, they are
// simply skipped.
func (c *MetadataClient) AddContextArtifactsAndExecutions(ctx context.Context, req *aiplatformpb.AddContextArtifactsAndExecutionsRequest, opts ...gax.CallOption) (*aiplatformpb.AddContextArtifactsAndExecutionsResponse, error) {
	return c.internalClient.AddContextArtifactsAndExecutions(ctx, req, opts...)
}

// AddContextChildren adds a set of Contexts as children to a parent Context. If any of the
// child Contexts have already been added to the parent Context, they are
// simply skipped. If this call would create a cycle or cause any Context to
// have more than 10 parents, the request will fail with an INVALID_ARGUMENT
// error.
func (c *MetadataClient) AddContextChildren(ctx context.Context, req *aiplatformpb.AddContextChildrenRequest, opts ...gax.CallOption) (*aiplatformpb.AddContextChildrenResponse, error) {
	return c.internalClient.AddContextChildren(ctx, req, opts...)
}

// RemoveContextChildren remove a set of children contexts from a parent Context. If any of the
// child Contexts were NOT added to the parent Context, they are
// simply skipped.
func (c *MetadataClient) RemoveContextChildren(ctx context.Context, req *aiplatformpb.RemoveContextChildrenRequest, opts ...gax.CallOption) (*aiplatformpb.RemoveContextChildrenResponse, error) {
	return c.internalClient.RemoveContextChildren(ctx, req, opts...)
}

// QueryContextLineageSubgraph retrieves Artifacts and Executions within the specified Context, connected
// by Event edges and returned as a LineageSubgraph.
func (c *MetadataClient) QueryContextLineageSubgraph(ctx context.Context, req *aiplatformpb.QueryContextLineageSubgraphRequest, opts ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error) {
	return c.internalClient.QueryContextLineageSubgraph(ctx, req, opts...)
}

// CreateExecution creates an Execution associated with a MetadataStore.
func (c *MetadataClient) CreateExecution(ctx context.Context, req *aiplatformpb.CreateExecutionRequest, opts ...gax.CallOption) (*aiplatformpb.Execution, error) {
	return c.internalClient.CreateExecution(ctx, req, opts...)
}

// GetExecution retrieves a specific Execution.
func (c *MetadataClient) GetExecution(ctx context.Context, req *aiplatformpb.GetExecutionRequest, opts ...gax.CallOption) (*aiplatformpb.Execution, error) {
	return c.internalClient.GetExecution(ctx, req, opts...)
}

// ListExecutions lists Executions in the MetadataStore.
func (c *MetadataClient) ListExecutions(ctx context.Context, req *aiplatformpb.ListExecutionsRequest, opts ...gax.CallOption) *ExecutionIterator {
	return c.internalClient.ListExecutions(ctx, req, opts...)
}

// UpdateExecution updates a stored Execution.
func (c *MetadataClient) UpdateExecution(ctx context.Context, req *aiplatformpb.UpdateExecutionRequest, opts ...gax.CallOption) (*aiplatformpb.Execution, error) {
	return c.internalClient.UpdateExecution(ctx, req, opts...)
}

// DeleteExecution deletes an Execution.
func (c *MetadataClient) DeleteExecution(ctx context.Context, req *aiplatformpb.DeleteExecutionRequest, opts ...gax.CallOption) (*DeleteExecutionOperation, error) {
	return c.internalClient.DeleteExecution(ctx, req, opts...)
}

// DeleteExecutionOperation returns a new DeleteExecutionOperation from a given name.
// The name must be that of a previously created DeleteExecutionOperation, possibly from a different process.
func (c *MetadataClient) DeleteExecutionOperation(name string) *DeleteExecutionOperation {
	return c.internalClient.DeleteExecutionOperation(name)
}

// PurgeExecutions purges Executions.
func (c *MetadataClient) PurgeExecutions(ctx context.Context, req *aiplatformpb.PurgeExecutionsRequest, opts ...gax.CallOption) (*PurgeExecutionsOperation, error) {
	return c.internalClient.PurgeExecutions(ctx, req, opts...)
}

// PurgeExecutionsOperation returns a new PurgeExecutionsOperation from a given name.
// The name must be that of a previously created PurgeExecutionsOperation, possibly from a different process.
func (c *MetadataClient) PurgeExecutionsOperation(name string) *PurgeExecutionsOperation {
	return c.internalClient.PurgeExecutionsOperation(name)
}

// AddExecutionEvents adds Events to the specified Execution. An Event indicates whether an
// Artifact was used as an input or output for an Execution. If an Event
// already exists between the Execution and the Artifact, the Event is
// skipped.
func (c *MetadataClient) AddExecutionEvents(ctx context.Context, req *aiplatformpb.AddExecutionEventsRequest, opts ...gax.CallOption) (*aiplatformpb.AddExecutionEventsResponse, error) {
	return c.internalClient.AddExecutionEvents(ctx, req, opts...)
}

// QueryExecutionInputsAndOutputs obtains the set of input and output Artifacts for this Execution, in the
// form of LineageSubgraph that also contains the Execution and connecting
// Events.
func (c *MetadataClient) QueryExecutionInputsAndOutputs(ctx context.Context, req *aiplatformpb.QueryExecutionInputsAndOutputsRequest, opts ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error) {
	return c.internalClient.QueryExecutionInputsAndOutputs(ctx, req, opts...)
}

// CreateMetadataSchema creates a MetadataSchema.
func (c *MetadataClient) CreateMetadataSchema(ctx context.Context, req *aiplatformpb.CreateMetadataSchemaRequest, opts ...gax.CallOption) (*aiplatformpb.MetadataSchema, error) {
	return c.internalClient.CreateMetadataSchema(ctx, req, opts...)
}

// GetMetadataSchema retrieves a specific MetadataSchema.
func (c *MetadataClient) GetMetadataSchema(ctx context.Context, req *aiplatformpb.GetMetadataSchemaRequest, opts ...gax.CallOption) (*aiplatformpb.MetadataSchema, error) {
	return c.internalClient.GetMetadataSchema(ctx, req, opts...)
}

// ListMetadataSchemas lists MetadataSchemas.
func (c *MetadataClient) ListMetadataSchemas(ctx context.Context, req *aiplatformpb.ListMetadataSchemasRequest, opts ...gax.CallOption) *MetadataSchemaIterator {
	return c.internalClient.ListMetadataSchemas(ctx, req, opts...)
}

// QueryArtifactLineageSubgraph retrieves lineage of an Artifact represented through Artifacts and
// Executions connected by Event edges and returned as a LineageSubgraph.
func (c *MetadataClient) QueryArtifactLineageSubgraph(ctx context.Context, req *aiplatformpb.QueryArtifactLineageSubgraphRequest, opts ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error) {
	return c.internalClient.QueryArtifactLineageSubgraph(ctx, req, opts...)
}

// GetLocation gets information about a location.
func (c *MetadataClient) GetLocation(ctx context.Context, req *locationpb.GetLocationRequest, opts ...gax.CallOption) (*locationpb.Location, error) {
	return c.internalClient.GetLocation(ctx, req, opts...)
}

// ListLocations lists information about the supported locations for this service.
func (c *MetadataClient) ListLocations(ctx context.Context, req *locationpb.ListLocationsRequest, opts ...gax.CallOption) *LocationIterator {
	return c.internalClient.ListLocations(ctx, req, opts...)
}

// GetIamPolicy gets the access control policy for a resource. Returns an empty policy
// if the resource exists and does not have a policy set.
func (c *MetadataClient) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	return c.internalClient.GetIamPolicy(ctx, req, opts...)
}

// SetIamPolicy sets the access control policy on the specified resource. Replaces
// any existing policy.
//
// Can return NOT_FOUND, INVALID_ARGUMENT, and PERMISSION_DENIED
// errors.
func (c *MetadataClient) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	return c.internalClient.SetIamPolicy(ctx, req, opts...)
}

// TestIamPermissions returns permissions that a caller has on the specified resource. If the
// resource does not exist, this will return an empty set of
// permissions, not a NOT_FOUND error.
//
// Note: This operation is designed to be used for building
// permission-aware UIs and command-line tools, not for authorization
// checking. This operation may “fail open” without warning.
func (c *MetadataClient) TestIamPermissions(ctx context.Context, req *iampb.TestIamPermissionsRequest, opts ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error) {
	return c.internalClient.TestIamPermissions(ctx, req, opts...)
}

// CancelOperation is a utility method from google.longrunning.Operations.
func (c *MetadataClient) CancelOperation(ctx context.Context, req *longrunningpb.CancelOperationRequest, opts ...gax.CallOption) error {
	return c.internalClient.CancelOperation(ctx, req, opts...)
}

// DeleteOperation is a utility method from google.longrunning.Operations.
func (c *MetadataClient) DeleteOperation(ctx context.Context, req *longrunningpb.DeleteOperationRequest, opts ...gax.CallOption) error {
	return c.internalClient.DeleteOperation(ctx, req, opts...)
}

// GetOperation is a utility method from google.longrunning.Operations.
func (c *MetadataClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	return c.internalClient.GetOperation(ctx, req, opts...)
}

// ListOperations is a utility method from google.longrunning.Operations.
func (c *MetadataClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	return c.internalClient.ListOperations(ctx, req, opts...)
}

// WaitOperation is a utility method from google.longrunning.Operations.
func (c *MetadataClient) WaitOperation(ctx context.Context, req *longrunningpb.WaitOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	return c.internalClient.WaitOperation(ctx, req, opts...)
}

// metadataGRPCClient is a client for interacting with Vertex AI API over gRPC transport.
//
// Methods, except Close, may be called concurrently. However, fields must not be modified concurrently with method calls.
type metadataGRPCClient struct {
	// Connection pool of gRPC connections to the service.
	connPool gtransport.ConnPool

	// Points back to the CallOptions field of the containing MetadataClient
	CallOptions **MetadataCallOptions

	// The gRPC API client.
	metadataClient aiplatformpb.MetadataServiceClient

	// LROClient is used internally to handle long-running operations.
	// It is exposed so that its CallOptions can be modified if required.
	// Users should not Close this client.
	LROClient **lroauto.OperationsClient

	operationsClient longrunningpb.OperationsClient

	iamPolicyClient iampb.IAMPolicyClient

	locationsClient locationpb.LocationsClient

	// The x-goog-* metadata to be sent with each request.
	xGoogHeaders []string
}

// NewMetadataClient creates a new metadata service client based on gRPC.
// The returned client must be Closed when it is done being used to clean up its underlying connections.
//
// Service for reading and writing metadata entries.
func NewMetadataClient(ctx context.Context, opts ...option.ClientOption) (*MetadataClient, error) {
	clientOpts := defaultMetadataGRPCClientOptions()
	if newMetadataClientHook != nil {
		hookOpts, err := newMetadataClientHook(ctx, clientHookParams{})
		if err != nil {
			return nil, err
		}
		clientOpts = append(clientOpts, hookOpts...)
	}

	connPool, err := gtransport.DialPool(ctx, append(clientOpts, opts...)...)
	if err != nil {
		return nil, err
	}
	client := MetadataClient{CallOptions: defaultMetadataCallOptions()}

	c := &metadataGRPCClient{
		connPool:         connPool,
		metadataClient:   aiplatformpb.NewMetadataServiceClient(connPool),
		CallOptions:      &client.CallOptions,
		operationsClient: longrunningpb.NewOperationsClient(connPool),
		iamPolicyClient:  iampb.NewIAMPolicyClient(connPool),
		locationsClient:  locationpb.NewLocationsClient(connPool),
	}
	c.setGoogleClientInfo()

	client.internalClient = c

	client.LROClient, err = lroauto.NewOperationsClient(ctx, gtransport.WithConnPool(connPool))
	if err != nil {
		// This error "should not happen", since we are just reusing old connection pool
		// and never actually need to dial.
		// If this does happen, we could leak connp. However, we cannot close conn:
		// If the user invoked the constructor with option.WithGRPCConn,
		// we would close a connection that's still in use.
		// TODO: investigate error conditions.
		return nil, err
	}
	c.LROClient = &client.LROClient
	return &client, nil
}

// Connection returns a connection to the API service.
//
// Deprecated: Connections are now pooled so this method does not always
// return the same resource.
func (c *metadataGRPCClient) Connection() *grpc.ClientConn {
	return c.connPool.Conn()
}

// setGoogleClientInfo sets the name and version of the application in
// the `x-goog-api-client` header passed on each request. Intended for
// use by Google-written clients.
func (c *metadataGRPCClient) setGoogleClientInfo(keyval ...string) {
	kv := append([]string{"gl-go", gax.GoVersion}, keyval...)
	kv = append(kv, "gapic", getVersionClient(), "gax", gax.Version, "grpc", grpc.Version)
	c.xGoogHeaders = []string{"x-goog-api-client", gax.XGoogHeader(kv...)}
}

// Close closes the connection to the API service. The user should invoke this when
// the client is no longer required.
func (c *metadataGRPCClient) Close() error {
	return c.connPool.Close()
}

func (c *metadataGRPCClient) CreateMetadataStore(ctx context.Context, req *aiplatformpb.CreateMetadataStoreRequest, opts ...gax.CallOption) (*CreateMetadataStoreOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).CreateMetadataStore[0:len((*c.CallOptions).CreateMetadataStore):len((*c.CallOptions).CreateMetadataStore)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.CreateMetadataStore(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &CreateMetadataStoreOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) GetMetadataStore(ctx context.Context, req *aiplatformpb.GetMetadataStoreRequest, opts ...gax.CallOption) (*aiplatformpb.MetadataStore, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetMetadataStore[0:len((*c.CallOptions).GetMetadataStore):len((*c.CallOptions).GetMetadataStore)], opts...)
	var resp *aiplatformpb.MetadataStore
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.GetMetadataStore(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) ListMetadataStores(ctx context.Context, req *aiplatformpb.ListMetadataStoresRequest, opts ...gax.CallOption) *MetadataStoreIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListMetadataStores[0:len((*c.CallOptions).ListMetadataStores):len((*c.CallOptions).ListMetadataStores)], opts...)
	it := &MetadataStoreIterator{}
	req = proto.Clone(req).(*aiplatformpb.ListMetadataStoresRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*aiplatformpb.MetadataStore, string, error) {
		resp := &aiplatformpb.ListMetadataStoresResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.metadataClient.ListMetadataStores(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetMetadataStores(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *metadataGRPCClient) DeleteMetadataStore(ctx context.Context, req *aiplatformpb.DeleteMetadataStoreRequest, opts ...gax.CallOption) (*DeleteMetadataStoreOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).DeleteMetadataStore[0:len((*c.CallOptions).DeleteMetadataStore):len((*c.CallOptions).DeleteMetadataStore)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.DeleteMetadataStore(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeleteMetadataStoreOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) CreateArtifact(ctx context.Context, req *aiplatformpb.CreateArtifactRequest, opts ...gax.CallOption) (*aiplatformpb.Artifact, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).CreateArtifact[0:len((*c.CallOptions).CreateArtifact):len((*c.CallOptions).CreateArtifact)], opts...)
	var resp *aiplatformpb.Artifact
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.CreateArtifact(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) GetArtifact(ctx context.Context, req *aiplatformpb.GetArtifactRequest, opts ...gax.CallOption) (*aiplatformpb.Artifact, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetArtifact[0:len((*c.CallOptions).GetArtifact):len((*c.CallOptions).GetArtifact)], opts...)
	var resp *aiplatformpb.Artifact
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.GetArtifact(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) ListArtifacts(ctx context.Context, req *aiplatformpb.ListArtifactsRequest, opts ...gax.CallOption) *ArtifactIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListArtifacts[0:len((*c.CallOptions).ListArtifacts):len((*c.CallOptions).ListArtifacts)], opts...)
	it := &ArtifactIterator{}
	req = proto.Clone(req).(*aiplatformpb.ListArtifactsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*aiplatformpb.Artifact, string, error) {
		resp := &aiplatformpb.ListArtifactsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.metadataClient.ListArtifacts(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetArtifacts(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *metadataGRPCClient) UpdateArtifact(ctx context.Context, req *aiplatformpb.UpdateArtifactRequest, opts ...gax.CallOption) (*aiplatformpb.Artifact, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "artifact.name", url.QueryEscape(req.GetArtifact().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).UpdateArtifact[0:len((*c.CallOptions).UpdateArtifact):len((*c.CallOptions).UpdateArtifact)], opts...)
	var resp *aiplatformpb.Artifact
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.UpdateArtifact(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) DeleteArtifact(ctx context.Context, req *aiplatformpb.DeleteArtifactRequest, opts ...gax.CallOption) (*DeleteArtifactOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).DeleteArtifact[0:len((*c.CallOptions).DeleteArtifact):len((*c.CallOptions).DeleteArtifact)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.DeleteArtifact(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeleteArtifactOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) PurgeArtifacts(ctx context.Context, req *aiplatformpb.PurgeArtifactsRequest, opts ...gax.CallOption) (*PurgeArtifactsOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).PurgeArtifacts[0:len((*c.CallOptions).PurgeArtifacts):len((*c.CallOptions).PurgeArtifacts)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.PurgeArtifacts(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &PurgeArtifactsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) CreateContext(ctx context.Context, req *aiplatformpb.CreateContextRequest, opts ...gax.CallOption) (*aiplatformpb.Context, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).CreateContext[0:len((*c.CallOptions).CreateContext):len((*c.CallOptions).CreateContext)], opts...)
	var resp *aiplatformpb.Context
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.CreateContext(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) GetContext(ctx context.Context, req *aiplatformpb.GetContextRequest, opts ...gax.CallOption) (*aiplatformpb.Context, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetContext[0:len((*c.CallOptions).GetContext):len((*c.CallOptions).GetContext)], opts...)
	var resp *aiplatformpb.Context
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.GetContext(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) ListContexts(ctx context.Context, req *aiplatformpb.ListContextsRequest, opts ...gax.CallOption) *ContextIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListContexts[0:len((*c.CallOptions).ListContexts):len((*c.CallOptions).ListContexts)], opts...)
	it := &ContextIterator{}
	req = proto.Clone(req).(*aiplatformpb.ListContextsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*aiplatformpb.Context, string, error) {
		resp := &aiplatformpb.ListContextsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.metadataClient.ListContexts(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetContexts(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *metadataGRPCClient) UpdateContext(ctx context.Context, req *aiplatformpb.UpdateContextRequest, opts ...gax.CallOption) (*aiplatformpb.Context, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "context.name", url.QueryEscape(req.GetContext().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).UpdateContext[0:len((*c.CallOptions).UpdateContext):len((*c.CallOptions).UpdateContext)], opts...)
	var resp *aiplatformpb.Context
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.UpdateContext(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) DeleteContext(ctx context.Context, req *aiplatformpb.DeleteContextRequest, opts ...gax.CallOption) (*DeleteContextOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).DeleteContext[0:len((*c.CallOptions).DeleteContext):len((*c.CallOptions).DeleteContext)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.DeleteContext(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeleteContextOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) PurgeContexts(ctx context.Context, req *aiplatformpb.PurgeContextsRequest, opts ...gax.CallOption) (*PurgeContextsOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).PurgeContexts[0:len((*c.CallOptions).PurgeContexts):len((*c.CallOptions).PurgeContexts)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.PurgeContexts(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &PurgeContextsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) AddContextArtifactsAndExecutions(ctx context.Context, req *aiplatformpb.AddContextArtifactsAndExecutionsRequest, opts ...gax.CallOption) (*aiplatformpb.AddContextArtifactsAndExecutionsResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "context", url.QueryEscape(req.GetContext()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).AddContextArtifactsAndExecutions[0:len((*c.CallOptions).AddContextArtifactsAndExecutions):len((*c.CallOptions).AddContextArtifactsAndExecutions)], opts...)
	var resp *aiplatformpb.AddContextArtifactsAndExecutionsResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.AddContextArtifactsAndExecutions(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) AddContextChildren(ctx context.Context, req *aiplatformpb.AddContextChildrenRequest, opts ...gax.CallOption) (*aiplatformpb.AddContextChildrenResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "context", url.QueryEscape(req.GetContext()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).AddContextChildren[0:len((*c.CallOptions).AddContextChildren):len((*c.CallOptions).AddContextChildren)], opts...)
	var resp *aiplatformpb.AddContextChildrenResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.AddContextChildren(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) RemoveContextChildren(ctx context.Context, req *aiplatformpb.RemoveContextChildrenRequest, opts ...gax.CallOption) (*aiplatformpb.RemoveContextChildrenResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "context", url.QueryEscape(req.GetContext()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).RemoveContextChildren[0:len((*c.CallOptions).RemoveContextChildren):len((*c.CallOptions).RemoveContextChildren)], opts...)
	var resp *aiplatformpb.RemoveContextChildrenResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.RemoveContextChildren(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) QueryContextLineageSubgraph(ctx context.Context, req *aiplatformpb.QueryContextLineageSubgraphRequest, opts ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "context", url.QueryEscape(req.GetContext()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).QueryContextLineageSubgraph[0:len((*c.CallOptions).QueryContextLineageSubgraph):len((*c.CallOptions).QueryContextLineageSubgraph)], opts...)
	var resp *aiplatformpb.LineageSubgraph
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.QueryContextLineageSubgraph(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) CreateExecution(ctx context.Context, req *aiplatformpb.CreateExecutionRequest, opts ...gax.CallOption) (*aiplatformpb.Execution, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).CreateExecution[0:len((*c.CallOptions).CreateExecution):len((*c.CallOptions).CreateExecution)], opts...)
	var resp *aiplatformpb.Execution
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.CreateExecution(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) GetExecution(ctx context.Context, req *aiplatformpb.GetExecutionRequest, opts ...gax.CallOption) (*aiplatformpb.Execution, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetExecution[0:len((*c.CallOptions).GetExecution):len((*c.CallOptions).GetExecution)], opts...)
	var resp *aiplatformpb.Execution
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.GetExecution(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) ListExecutions(ctx context.Context, req *aiplatformpb.ListExecutionsRequest, opts ...gax.CallOption) *ExecutionIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListExecutions[0:len((*c.CallOptions).ListExecutions):len((*c.CallOptions).ListExecutions)], opts...)
	it := &ExecutionIterator{}
	req = proto.Clone(req).(*aiplatformpb.ListExecutionsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*aiplatformpb.Execution, string, error) {
		resp := &aiplatformpb.ListExecutionsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.metadataClient.ListExecutions(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetExecutions(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *metadataGRPCClient) UpdateExecution(ctx context.Context, req *aiplatformpb.UpdateExecutionRequest, opts ...gax.CallOption) (*aiplatformpb.Execution, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "execution.name", url.QueryEscape(req.GetExecution().GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).UpdateExecution[0:len((*c.CallOptions).UpdateExecution):len((*c.CallOptions).UpdateExecution)], opts...)
	var resp *aiplatformpb.Execution
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.UpdateExecution(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) DeleteExecution(ctx context.Context, req *aiplatformpb.DeleteExecutionRequest, opts ...gax.CallOption) (*DeleteExecutionOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).DeleteExecution[0:len((*c.CallOptions).DeleteExecution):len((*c.CallOptions).DeleteExecution)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.DeleteExecution(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &DeleteExecutionOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) PurgeExecutions(ctx context.Context, req *aiplatformpb.PurgeExecutionsRequest, opts ...gax.CallOption) (*PurgeExecutionsOperation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).PurgeExecutions[0:len((*c.CallOptions).PurgeExecutions):len((*c.CallOptions).PurgeExecutions)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.PurgeExecutions(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return &PurgeExecutionsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, resp),
	}, nil
}

func (c *metadataGRPCClient) AddExecutionEvents(ctx context.Context, req *aiplatformpb.AddExecutionEventsRequest, opts ...gax.CallOption) (*aiplatformpb.AddExecutionEventsResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "execution", url.QueryEscape(req.GetExecution()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).AddExecutionEvents[0:len((*c.CallOptions).AddExecutionEvents):len((*c.CallOptions).AddExecutionEvents)], opts...)
	var resp *aiplatformpb.AddExecutionEventsResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.AddExecutionEvents(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) QueryExecutionInputsAndOutputs(ctx context.Context, req *aiplatformpb.QueryExecutionInputsAndOutputsRequest, opts ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "execution", url.QueryEscape(req.GetExecution()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).QueryExecutionInputsAndOutputs[0:len((*c.CallOptions).QueryExecutionInputsAndOutputs):len((*c.CallOptions).QueryExecutionInputsAndOutputs)], opts...)
	var resp *aiplatformpb.LineageSubgraph
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.QueryExecutionInputsAndOutputs(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) CreateMetadataSchema(ctx context.Context, req *aiplatformpb.CreateMetadataSchemaRequest, opts ...gax.CallOption) (*aiplatformpb.MetadataSchema, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).CreateMetadataSchema[0:len((*c.CallOptions).CreateMetadataSchema):len((*c.CallOptions).CreateMetadataSchema)], opts...)
	var resp *aiplatformpb.MetadataSchema
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.CreateMetadataSchema(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) GetMetadataSchema(ctx context.Context, req *aiplatformpb.GetMetadataSchemaRequest, opts ...gax.CallOption) (*aiplatformpb.MetadataSchema, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetMetadataSchema[0:len((*c.CallOptions).GetMetadataSchema):len((*c.CallOptions).GetMetadataSchema)], opts...)
	var resp *aiplatformpb.MetadataSchema
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.GetMetadataSchema(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) ListMetadataSchemas(ctx context.Context, req *aiplatformpb.ListMetadataSchemasRequest, opts ...gax.CallOption) *MetadataSchemaIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "parent", url.QueryEscape(req.GetParent()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListMetadataSchemas[0:len((*c.CallOptions).ListMetadataSchemas):len((*c.CallOptions).ListMetadataSchemas)], opts...)
	it := &MetadataSchemaIterator{}
	req = proto.Clone(req).(*aiplatformpb.ListMetadataSchemasRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*aiplatformpb.MetadataSchema, string, error) {
		resp := &aiplatformpb.ListMetadataSchemasResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.metadataClient.ListMetadataSchemas(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetMetadataSchemas(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *metadataGRPCClient) QueryArtifactLineageSubgraph(ctx context.Context, req *aiplatformpb.QueryArtifactLineageSubgraphRequest, opts ...gax.CallOption) (*aiplatformpb.LineageSubgraph, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "artifact", url.QueryEscape(req.GetArtifact()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).QueryArtifactLineageSubgraph[0:len((*c.CallOptions).QueryArtifactLineageSubgraph):len((*c.CallOptions).QueryArtifactLineageSubgraph)], opts...)
	var resp *aiplatformpb.LineageSubgraph
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.metadataClient.QueryArtifactLineageSubgraph(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) GetLocation(ctx context.Context, req *locationpb.GetLocationRequest, opts ...gax.CallOption) (*locationpb.Location, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetLocation[0:len((*c.CallOptions).GetLocation):len((*c.CallOptions).GetLocation)], opts...)
	var resp *locationpb.Location
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.locationsClient.GetLocation(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) ListLocations(ctx context.Context, req *locationpb.ListLocationsRequest, opts ...gax.CallOption) *LocationIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListLocations[0:len((*c.CallOptions).ListLocations):len((*c.CallOptions).ListLocations)], opts...)
	it := &LocationIterator{}
	req = proto.Clone(req).(*locationpb.ListLocationsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*locationpb.Location, string, error) {
		resp := &locationpb.ListLocationsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.locationsClient.ListLocations(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetLocations(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *metadataGRPCClient) GetIamPolicy(ctx context.Context, req *iampb.GetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetIamPolicy[0:len((*c.CallOptions).GetIamPolicy):len((*c.CallOptions).GetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamPolicyClient.GetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) SetIamPolicy(ctx context.Context, req *iampb.SetIamPolicyRequest, opts ...gax.CallOption) (*iampb.Policy, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).SetIamPolicy[0:len((*c.CallOptions).SetIamPolicy):len((*c.CallOptions).SetIamPolicy)], opts...)
	var resp *iampb.Policy
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamPolicyClient.SetIamPolicy(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) TestIamPermissions(ctx context.Context, req *iampb.TestIamPermissionsRequest, opts ...gax.CallOption) (*iampb.TestIamPermissionsResponse, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "resource", url.QueryEscape(req.GetResource()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).TestIamPermissions[0:len((*c.CallOptions).TestIamPermissions):len((*c.CallOptions).TestIamPermissions)], opts...)
	var resp *iampb.TestIamPermissionsResponse
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.iamPolicyClient.TestIamPermissions(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) CancelOperation(ctx context.Context, req *longrunningpb.CancelOperationRequest, opts ...gax.CallOption) error {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).CancelOperation[0:len((*c.CallOptions).CancelOperation):len((*c.CallOptions).CancelOperation)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.operationsClient.CancelOperation(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *metadataGRPCClient) DeleteOperation(ctx context.Context, req *longrunningpb.DeleteOperationRequest, opts ...gax.CallOption) error {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).DeleteOperation[0:len((*c.CallOptions).DeleteOperation):len((*c.CallOptions).DeleteOperation)], opts...)
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		_, err = c.operationsClient.DeleteOperation(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	return err
}

func (c *metadataGRPCClient) GetOperation(ctx context.Context, req *longrunningpb.GetOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).GetOperation[0:len((*c.CallOptions).GetOperation):len((*c.CallOptions).GetOperation)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.operationsClient.GetOperation(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

func (c *metadataGRPCClient) ListOperations(ctx context.Context, req *longrunningpb.ListOperationsRequest, opts ...gax.CallOption) *OperationIterator {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).ListOperations[0:len((*c.CallOptions).ListOperations):len((*c.CallOptions).ListOperations)], opts...)
	it := &OperationIterator{}
	req = proto.Clone(req).(*longrunningpb.ListOperationsRequest)
	it.InternalFetch = func(pageSize int, pageToken string) ([]*longrunningpb.Operation, string, error) {
		resp := &longrunningpb.ListOperationsResponse{}
		if pageToken != "" {
			req.PageToken = pageToken
		}
		if pageSize > math.MaxInt32 {
			req.PageSize = math.MaxInt32
		} else if pageSize != 0 {
			req.PageSize = int32(pageSize)
		}
		err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
			var err error
			resp, err = c.operationsClient.ListOperations(ctx, req, settings.GRPC...)
			return err
		}, opts...)
		if err != nil {
			return nil, "", err
		}

		it.Response = resp
		return resp.GetOperations(), resp.GetNextPageToken(), nil
	}
	fetch := func(pageSize int, pageToken string) (string, error) {
		items, nextPageToken, err := it.InternalFetch(pageSize, pageToken)
		if err != nil {
			return "", err
		}
		it.items = append(it.items, items...)
		return nextPageToken, nil
	}

	it.pageInfo, it.nextFunc = iterator.NewPageInfo(fetch, it.bufLen, it.takeBuf)
	it.pageInfo.MaxSize = int(req.GetPageSize())
	it.pageInfo.Token = req.GetPageToken()

	return it
}

func (c *metadataGRPCClient) WaitOperation(ctx context.Context, req *longrunningpb.WaitOperationRequest, opts ...gax.CallOption) (*longrunningpb.Operation, error) {
	hds := []string{"x-goog-request-params", fmt.Sprintf("%s=%v", "name", url.QueryEscape(req.GetName()))}

	hds = append(c.xGoogHeaders, hds...)
	ctx = gax.InsertMetadataIntoOutgoingContext(ctx, hds...)
	opts = append((*c.CallOptions).WaitOperation[0:len((*c.CallOptions).WaitOperation):len((*c.CallOptions).WaitOperation)], opts...)
	var resp *longrunningpb.Operation
	err := gax.Invoke(ctx, func(ctx context.Context, settings gax.CallSettings) error {
		var err error
		resp, err = c.operationsClient.WaitOperation(ctx, req, settings.GRPC...)
		return err
	}, opts...)
	if err != nil {
		return nil, err
	}
	return resp, nil
}

// CreateMetadataStoreOperation returns a new CreateMetadataStoreOperation from a given name.
// The name must be that of a previously created CreateMetadataStoreOperation, possibly from a different process.
func (c *metadataGRPCClient) CreateMetadataStoreOperation(name string) *CreateMetadataStoreOperation {
	return &CreateMetadataStoreOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// DeleteArtifactOperation returns a new DeleteArtifactOperation from a given name.
// The name must be that of a previously created DeleteArtifactOperation, possibly from a different process.
func (c *metadataGRPCClient) DeleteArtifactOperation(name string) *DeleteArtifactOperation {
	return &DeleteArtifactOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// DeleteContextOperation returns a new DeleteContextOperation from a given name.
// The name must be that of a previously created DeleteContextOperation, possibly from a different process.
func (c *metadataGRPCClient) DeleteContextOperation(name string) *DeleteContextOperation {
	return &DeleteContextOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// DeleteExecutionOperation returns a new DeleteExecutionOperation from a given name.
// The name must be that of a previously created DeleteExecutionOperation, possibly from a different process.
func (c *metadataGRPCClient) DeleteExecutionOperation(name string) *DeleteExecutionOperation {
	return &DeleteExecutionOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// DeleteMetadataStoreOperation returns a new DeleteMetadataStoreOperation from a given name.
// The name must be that of a previously created DeleteMetadataStoreOperation, possibly from a different process.
func (c *metadataGRPCClient) DeleteMetadataStoreOperation(name string) *DeleteMetadataStoreOperation {
	return &DeleteMetadataStoreOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// PurgeArtifactsOperation returns a new PurgeArtifactsOperation from a given name.
// The name must be that of a previously created PurgeArtifactsOperation, possibly from a different process.
func (c *metadataGRPCClient) PurgeArtifactsOperation(name string) *PurgeArtifactsOperation {
	return &PurgeArtifactsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// PurgeContextsOperation returns a new PurgeContextsOperation from a given name.
// The name must be that of a previously created PurgeContextsOperation, possibly from a different process.
func (c *metadataGRPCClient) PurgeContextsOperation(name string) *PurgeContextsOperation {
	return &PurgeContextsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}

// PurgeExecutionsOperation returns a new PurgeExecutionsOperation from a given name.
// The name must be that of a previously created PurgeExecutionsOperation, possibly from a different process.
func (c *metadataGRPCClient) PurgeExecutionsOperation(name string) *PurgeExecutionsOperation {
	return &PurgeExecutionsOperation{
		lro: longrunning.InternalNewOperation(*c.LROClient, &longrunningpb.Operation{Name: name}),
	}
}