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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 | } | ||