1 /*
   2  * Copyright (c) 2014, 2017, 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.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 import java.lang.instrument.ClassFileTransformer;
  26 import java.lang.instrument.Instrumentation;
  27 
  28 // This class is available on the classpath so it can be accessed by InstrumentationApp
  29 public class InstrumentationRegisterClassFileTransformer {
  30     private static Instrumentation savedInstrumentation;
  31 
  32     public static void premain(String agentArguments, Instrumentation instrumentation) {
  33         System.out.println("InstrumentationRegisterClassFileTransformer.premain() is called");
  34         instrumentation.addTransformer(new InstrumentationClassFileTransformer(), /*canRetransform=*/true);
  35         savedInstrumentation = instrumentation;
  36     }
  37 
  38     public static Instrumentation getInstrumentation() {
  39         return savedInstrumentation;
  40     }
  41 
  42     public static void agentmain(String args, Instrumentation inst) throws Exception {
  43         premain(args, inst);
  44     }
  45 }