| // Copyright 2014 Google Inc. All Rights Reserved. |
| // |
| // 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 |
| // |
| // http://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. |
| |
| package com.google.enterprise.adaptor; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.enterprise.adaptor.prebuilt.StreamingCommand; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.RuntimeMXBean; |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Properties; |
| import java.util.Set; |
| |
| /** |
| * Creates a Java process with similar settings to the current process. |
| */ |
| class JavaExec { |
| /** |
| * Property names whose value refers to a file. These properties' values may |
| * need modification to point to the correct file, since the working |
| * directories can be different. |
| */ |
| private static final Set<String> FILE_PROPERTIES |
| = Collections.unmodifiableSet(new HashSet<String>(Arrays.asList( |
| "javax.net.ssl.keyStore", "javax.net.ssl.trustStore", |
| "java.util.logging.config.file"))); |
| |
| @VisibleForTesting |
| static RuntimeMXBean runtimeMxBean = ManagementFactory.getRuntimeMXBean(); |
| |
| // Prevent instantiation. |
| private JavaExec() {} |
| |
| /** |
| * Execute {@code jar} as a subprocess with working directory {@code |
| * workingDir} with application arguments {@code args}. {@code jar} is |
| * relative to {@code workingDir}. If {@code workingDir} is {@code null}, then |
| * the current working directory is used. |
| */ |
| public static int exec(File jar, File workingDir, List<String> args) |
| throws IOException, InterruptedException { |
| Properties props = System.getProperties(); |
| String javaHome = props.getProperty("java.home"); |
| String javaExe = props.getProperty("os.name").startsWith("Windows") |
| ? "java.exe" : "java"; |
| File java = new File(new File(new File(javaHome), "bin"), javaExe); |
| if (!java.exists()) { |
| throw new IOException("Could not find java executable at " |
| + java.getPath()); |
| } |
| List<String> command = new ArrayList<String>(); |
| command.add(java.getPath()); |
| command.addAll(computeJvmArgs(workingDir)); |
| command.add("-jar"); |
| command.add(jar.getPath()); |
| command.addAll(args); |
| return StreamingCommand.exec(command.toArray(new String[0]), workingDir, |
| StreamingCommand.streamInputSource( |
| new java.io.ByteArrayInputStream(new byte[0])), |
| StreamingCommand.streamOutputSink(System.out), |
| StreamingCommand.streamOutputSink(System.err)); |
| } |
| |
| private static List<String> computeJvmArgs(File workingDir) { |
| List<String> curArgs = runtimeMxBean.getInputArguments(); |
| List<String> newArgs = new ArrayList<String>(curArgs.size()); |
| for (String arg : curArgs) { |
| if (arg.startsWith("-D")) { |
| String[] parts = arg.substring(2).split("=", 2); |
| if (FILE_PROPERTIES.contains(parts[0])) { |
| // Make path to value absolute, so working directory won't impact its |
| // meaning. |
| arg = "-D" + parts[0] + "=" + new File(parts[1]).getAbsolutePath(); |
| } |
| } |
| newArgs.add(arg); |
| } |
| return newArgs; |
| } |
| } |