| /* |
| * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.tracing; |
| |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Field; |
| import com.sun.tracing.Probe; |
| |
| /** |
| * Provides common code for implementation of {@code Probe} classes. |
| * |
| * @since 1.7 |
| */ |
| public abstract class ProbeSkeleton implements Probe { |
| |
| protected Class<?>[] parameters; |
| |
| protected ProbeSkeleton(Class<?>[] parameters) { |
| this.parameters = parameters; |
| } |
| |
| public abstract boolean isEnabled(); // framework-dependent |
| |
| /** |
| * Triggers the probe with verified arguments. |
| * |
| * The caller of this method must have already determined that the |
| * arity and types of the arguments match what the probe was |
| * declared with. |
| */ |
| public abstract void uncheckedTrigger(Object[] args); // framework-dependent |
| |
| private static boolean isAssignable(Object o, Class<?> formal) { |
| if (o != null) { |
| if ( !formal.isInstance(o) ) { |
| if ( formal.isPrimitive() ) { // o might be a boxed primitive |
| try { |
| // Yuck. There must be a better way of doing this |
| Field f = o.getClass().getField("TYPE"); |
| return formal.isAssignableFrom((Class<?>)f.get(null)); |
| } catch (Exception e) { |
| /* fall-through. */ |
| } |
| } |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** |
| * Performs a type-check of the parameters before triggering the probe. |
| */ |
| public void trigger(Object ... args) { |
| if (args.length != parameters.length) { |
| throw new IllegalArgumentException("Wrong number of arguments"); |
| } else { |
| for (int i = 0; i < parameters.length; ++i) { |
| if ( !isAssignable(args[i], parameters[i]) ) { |
| throw new IllegalArgumentException( |
| "Wrong type of argument at position " + i); |
| } |
| } |
| uncheckedTrigger(args); |
| } |
| } |
| } |