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.dtrace;

    27 

    28 import java.lang.reflect.Method;

    29 import java.lang.reflect.InvocationTargetException;

    30 

    31 import sun.tracing.ProbeSkeleton;

    32 

    33 class DTraceProbe extends ProbeSkeleton {

    34     private Object proxy;

    35     private Method declared_method;

    36     private Method implementing_method;

    37 

    38     DTraceProbe(Object proxy, Method m) {

    39         super(m.getParameterTypes());

    40         this.proxy = proxy;

    41         this.declared_method = m;

    42         try {

    43             // The JVM will override the proxy method's implementation with

    44             // a version that will invoke the probe.

    45             this.implementing_method =  proxy.getClass().getMethod(

    46                 m.getName(), m.getParameterTypes());

    47         } catch (NoSuchMethodException e) {

    48             throw new RuntimeException("Internal error, wrong proxy class");

    49         }

    50     }

    51 

    52     public boolean isEnabled() {

    53         return JVM.isEnabled(implementing_method);

    54     }

    55 

    56     public void uncheckedTrigger(Object[] args) {

    57         try {

    58             implementing_method.invoke(proxy, args);

    59         } catch (IllegalAccessException e) {

    60             assert false;

    61         } catch (InvocationTargetException e) {

    62             assert false;

    63         }

    64     }

    65 

    66     String getProbeName() {

    67         return DTraceProvider.getProbeName(declared_method);

    68     }

    69 

    70     String getFunctionName() {

    71         return DTraceProvider.getFunctionName(declared_method);

    72     }

    73 

    74     Method getMethod() {

    75         return implementing_method;

    76     }

    77 

    78     Class<?>[] getParameterTypes() {

    79         return this.parameters;

    80     }

    81 }

    82