Mercurial > hg > release > thermostat-1.2
view vm-profiler/jvm-agent/src/main/java/com/redhat/thermostat/vm/profiler/agent/jvm/ProfilerAgent.java @ 1614:37bcf1f12fd8
Make the profiler jvm-agent work with Java 6
Reviewed-by: vanaltj
Review-thread: http://icedtea.classpath.org/pipermail/thermostat/2014-December/012210.html
author | Omair Majid <omajid@redhat.com> |
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date | Wed, 10 Dec 2014 19:47:50 -0500 |
parents | 247db2fa05c5 |
children | c6ae78b6f3ac |
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/* * Copyright 2012-2014 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2, or (at your * option) any later version. * * Thermostat is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.vm.profiler.agent.jvm; import java.io.IOException; import java.lang.instrument.Instrumentation; import java.lang.reflect.Constructor; import java.lang.reflect.Method; import java.lang.reflect.InvocationTargetException; import java.util.jar.JarFile; /** * This is an {@link Instrumentation} agent that sets up the classpath with jars * supplied as agent parameters and then invokes {@link Main}. */ public class ProfilerAgent { public static void premain(String agentArgs, Instrumentation instrumentation) { initializeAgent(agentArgs, instrumentation); } public static void agentmain(String agentArgs, Instrumentation instrumentation) { initializeAgent(agentArgs, instrumentation); } private static void initializeAgent(String args, Instrumentation instrumentation) { System.out.println("AGENT: loaded"); // This is the saner approach, but for now we are brute-forcing a // hardcoded path using a manifest entry // String jars = args; // addJarsToClassPath(jars, instrumentation); invokeMain(instrumentation); } private static void addJarsToClassPath(String jars, Instrumentation instrumentation) throws AssertionError { // System.out.println("Classpath: " + System.getProperty("java.class.path")); boolean addToBoot = true; String[] jarPaths = jars.split(":"); for (String jarPath : jarPaths) { JarFile jarFile = null; try { jarFile = new JarFile(jarPath); // FIXME needs to be bootclassloader if it is to be visible everywhere if (addToBoot) { instrumentation.appendToBootstrapClassLoaderSearch(jarFile); } else { instrumentation.appendToSystemClassLoaderSearch(jarFile); } System.out.println("AGENT: Added" + jarPath + " to " + (addToBoot ? "bootstrap" : "system") + " classpath"); } catch (IOException e) { throw new AssertionError(jarFile + " not found!"); } } } private static void invokeMain(Instrumentation instrumentation) { try { // do this via reflection so the version in system boot classpath is used! Class<?> klass = ClassLoader.getSystemClassLoader().loadClass("com.redhat.thermostat.vm.profiler.agent.jvm.Main"); Constructor<?> constructor = klass.getConstructor(Instrumentation.class); Object main = constructor.newInstance(instrumentation); Method runMethod = klass.getMethod("run"); runMethod.invoke(main); } catch (ClassNotFoundException e) { e.printStackTrace(); System.err.println("Unable to initialize agent"); } catch (NoSuchMethodException e) { e.printStackTrace(); System.err.println("Unable to initialize agent"); } catch (IllegalAccessException e) { e.printStackTrace(); System.err.println("Unable to initialize agent"); } catch (InstantiationException e) { e.printStackTrace(); System.err.println("Unable to initialize agent"); } catch (InvocationTargetException e) { e.printStackTrace(); System.err.println("Unable to initialize agent"); } catch (SecurityException e) { e.printStackTrace(); System.err.println("Unable to initialize agent"); } } }