Showing the changes to java/pkg/sun/tracing/ProbeSkeleton.java (1 of 18352 files). Show all
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| 1 | +/* | |
| 2 | + * Copyright (c) 2008, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.tracing; | |
| 27 | + | |
| 28 | +import java.lang.reflect.Method; | |
| 29 | +import java.lang.reflect.Field; | |
| 30 | +import com.sun.tracing.Probe; | |
| 31 | + | |
| 32 | +/** | |
| 33 | + * Provides common code for implementation of {@code Probe} classes. | |
| 34 | + * | |
| 35 | + * @since 1.7 | |
| 36 | + */ | |
| 37 | +public abstract class ProbeSkeleton implements Probe { | |
| 38 | + | |
| 39 | + protected Class<?>[] parameters; | |
| 40 | + | |
| 41 | + protected ProbeSkeleton(Class<?>[] parameters) { | |
| 42 | + this.parameters = parameters; | |
| 43 | + } | |
| 44 | + | |
| 45 | + public abstract boolean isEnabled(); // framework-dependent | |
| 46 | + | |
| 47 | + /** | |
| 48 | + * Triggers the probe with verified arguments. | |
| 49 | + * | |
| 50 | + * The caller of this method must have already determined that the | |
| 51 | + * arity and types of the arguments match what the probe was | |
| 52 | + * declared with. | |
| 53 | + */ | |
| 54 | + public abstract void uncheckedTrigger(Object[] args); // framework-dependent | |
| 55 | + | |
| 56 | + private static boolean isAssignable(Object o, Class<?> formal) { | |
| 57 | + if (o != null) { | |
| 58 | + if ( !formal.isInstance(o) ) { | |
| 59 | + if ( formal.isPrimitive() ) { // o might be a boxed primitive | |
| 60 | + try { | |
| 61 | + // Yuck. There must be a better way of doing this | |
| 62 | + Field f = o.getClass().getField("TYPE"); | |
| 63 | + return formal.isAssignableFrom((Class<?>)f.get(null)); | |
| 64 | + } catch (Exception e) { | |
| 65 | + /* fall-through. */ | |
| 66 | + } | |
| 67 | + } | |
| 68 | + return false; | |
| 69 | + } | |
| 70 | + } | |
| 71 | + return true; | |
| 72 | + } | |
| 73 | + | |
| 74 | + /** | |
| 75 | + * Performs a type-check of the parameters before triggering the probe. | |
| 76 | + */ | |
| 77 | + public void trigger(Object ... args) { | |
| 78 | + if (args.length != parameters.length) { | |
| 79 | + throw new IllegalArgumentException("Wrong number of arguments"); | |
| 80 | + } else { | |
| 81 | + for (int i = 0; i < parameters.length; ++i) { | |
| 82 | + if ( !isAssignable(args[i], parameters[i]) ) { | |
| 83 | + throw new IllegalArgumentException( | |
| 84 | + "Wrong type of argument at position " + i); | |
| 85 | + } | |
| 86 | + } | |
| 87 | + uncheckedTrigger(args); | |
| 88 | + } | |
| 89 | + } | |
| 90 | +} | |