io.joshworks.snappy.maven.tools.AgentAttacher Maven / Gradle / Ivy
/*
* Copyright 2012-2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.joshworks.snappy.maven.tools;
import java.io.File;
import java.lang.management.ManagementFactory;
import java.lang.reflect.Method;
import java.util.List;
/**
* Utility class to attach an instrumentation agent to the running JVM.
*
* @author Dave Syer
*/
public abstract class AgentAttacher {
private static final String VIRTUAL_MACHINE_CLASS_NAME = "com.sun.tools.attach.VirtualMachine";
public static void attach(File agent) {
try {
String name = ManagementFactory.getRuntimeMXBean().getName();
String pid = name.substring(0, name.indexOf('@'));
ClassLoader classLoader = JvmUtils.getToolsClassLoader();
Class vmClass = classLoader.loadClass(VIRTUAL_MACHINE_CLASS_NAME);
Method attachMethod = vmClass.getDeclaredMethod("attach", String.class);
Object vm = attachMethod.invoke(null, pid);
Method loadAgentMethod = vmClass.getDeclaredMethod("loadAgent", String.class);
loadAgentMethod.invoke(vm, agent.getAbsolutePath());
vmClass.getDeclaredMethod("detach").invoke(vm);
} catch (Exception ex) {
throw new RuntimeException("Unable to attach agent to the JVM", ex);
}
}
public static List commandLineArguments() {
return ManagementFactory.getRuntimeMXBean().getInputArguments();
}
public static boolean hasNoVerify() {
return commandLineArguments().contains("-Xverify:none");
}
}