oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializerAgent Maven / Gradle / Ivy
/*
* The contents of this file are subject to the terms
* of the Common Development and Distribution License
* (the "License"). You may not use this file except
* in compliance with the License.
*
* You can obtain a copy of the license at
* glassfish/bootstrap/legal/CDDLv1.0.txt or
* https://glassfish.dev.java.net/public/CDDLv1.0.html.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* HEADER in each file and include the License file at
* glassfish/bootstrap/legal/CDDLv1.0.txt. If applicable,
* add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your
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// Copyright (c) 1998, 2007, Oracle. All rights reserved.
package oracle.toplink.essentials.internal.ejb.cmp3;
import java.lang.instrument.*;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
/**
* This agent is intended to be run prior to start up on a CMP3 JavaSE application.
* It gets the globalInstrumentation and makes it available to TopLink's initialization code.
* There are two kinds of initialization. Normally, initialization occurs through reflective
* creation and invokation of TopLink JavaSECMPInitializer.
* It is possible to run it with the "main" argument to the agent in which case it will simply
* try to set the globalInstrumentation field on the JavaSECMPInitializer. This type of initialization
* is useful when debugging, but imposes some restrictions on the user. One such restriction is
* that no domain classes that use lazy loading may be references in any way other than reflective in the application
*/
public class JavaSECMPInitializerAgent {
public static void premain(String agentArgs, Instrumentation instr) throws Exception {
// Reflection allows:
// JavaSECMPInitializerAgent to be the *ONLY* class is the jar file specified in -javaagent;
// Loading JavaSECMPInitializer class using SystemClassLoader.
if ((agentArgs != null) && agentArgs.equals("main")) {
initializeFromMain(instr);
} else {
initializeFromAgent(instr);
}
}
public static void initializeFromAgent(Instrumentation instr) throws Exception {
Class cls = Class.forName("oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer");
Method method = cls.getDeclaredMethod("initializeFromAgent", new Class[] { Instrumentation.class });
method.invoke(null, new Object[] { instr });
}
public static void initializeFromMain(Instrumentation instr) throws Exception {
Class cls = Class.forName("oracle.toplink.essentials.internal.ejb.cmp3.JavaSECMPInitializer");
Field field = cls.getField("globalInstrumentation");
field.set(null, instr);
}
}