com.mgmtp.perfload.agent.Agent Maven / Gradle / Ivy
/*
* Copyright (c) 2013 mgm technology partners GmbH
*
* 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 com.mgmtp.perfload.agent;
import java.lang.instrument.Instrumentation;
import javax.inject.Inject;
import com.google.inject.Injector;
/**
* Java agent main class. Called by the JVM.
*
* @author rnaegele
*/
public class Agent {
private final AgentLogger logger;
private final Transformer transformer;
@Inject
Agent(final AgentLogger logger, final Transformer transformer) {
this.logger = logger;
this.transformer = transformer;
logger.writeln("Starting perfLoad Agent...");
}
void addTransformer(final Instrumentation instrumentation) {
logger.writeln("Adding transformer...");
instrumentation.addTransformer(transformer);
}
/**
* @param agentArgs
* arguments for the agent; not used
* @param instrumentation
* the {@link Instrumentation} instance
*/
public static void premain(final String agentArgs, final Instrumentation instrumentation) {
Injector injector = InjectorHolder.INSTANCE.getInjector();
injector.getInstance(Agent.class).addTransformer(instrumentation);
}
}