/**
* Copyright 2013 Netflix, Inc.
*
* 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.netflix.hystrix.contrib.networkauditor;
import java.lang.instrument.Instrumentation;
/**
* Java Agent to instrument network code in the java.* libraries and use Hystrix state to determine if calls are Hystrix-isolated or not.
*/
public class HystrixNetworkAuditorAgent {
private static final HystrixNetworkAuditorEventListener DEFAULT_BRIDGE = new HystrixNetworkAuditorEventListener() {
@Override
public void handleNetworkEvent() {
// do nothing
}
};
private static volatile HystrixNetworkAuditorEventListener bridge = DEFAULT_BRIDGE;
public static void premain(String agentArgs, Instrumentation inst) {
inst.addTransformer(new NetworkClassTransform());
}
/**
* Invoked by instrumented code when network access occurs.
*/
public static void notifyOfNetworkEvent() {
bridge.handleNetworkEvent();
}
/**
* Register the implementation of the {@link HystrixNetworkAuditorEventListener} that will receive the events.
*
* @param bridge
* {@link HystrixNetworkAuditorEventListener} implementation
*/
public static void registerEventListener(HystrixNetworkAuditorEventListener bridge) {
if (bridge == null) {
throw new IllegalArgumentException("HystrixNetworkAuditorEventListener can not be NULL");
}
HystrixNetworkAuditorAgent.bridge = bridge;
}
}