/**
* 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;
/**
* Event listener that gets implemented and registered with {@link HystrixNetworkAuditorAgent#registerEventListener(HystrixNetworkAuditorEventListener)} by the application
* running Hystrix in the application classloader into this JavaAgent running in the boot classloader so events can be invoked on code inside the application classloader.
*/
public interface HystrixNetworkAuditorEventListener {
/**
* Invoked by the {@link HystrixNetworkAuditorAgent} when network events occur.
* <p>
* An event may be the opening of a socket, channel or reading/writing bytes. It is not guaranteed to be a one-to-one relationship with a request/response.
* <p>
* No arguments are returned as it is left to the implementation to decide whether the current thread stacktrace should be captured or not.
* <p>
* Typical implementations will want to filter to non-Hystrix isolated network traffic with code such as this:
*
* <pre> {@code
*
* if (Hystrix.getCurrentThreadExecutingCommand() == null) {
* // this event is not inside a Hystrix context (according to ThreadLocal variables)
* StackTraceElement[] stack = Thread.currentThread().getStackTrace();
* // increment counters, fire alerts, log stack traces etc
* }
* } </pre>
*
*/
public void handleNetworkEvent();
}