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