/*
* Licensed to the Apache Software Foundation (ASF) under one or more contributor license
* agreements. See the NOTICE file distributed with this work for additional information regarding
* copyright ownership. The ASF licenses this file to You 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 org.apache.geode.distributed.internal;
/**
* This class is a test hook to intercept DistributionMessages in the VM receiving the message.
*
*
*/
public abstract class DistributionMessageObserver {
private static DistributionMessageObserver instance;
/**
* Set the instance of the observer. Setting to null will clear the observer.
*
* @param instance
* @return the old observer, or null if there was no old observer.
*/
public static final DistributionMessageObserver setInstance(
DistributionMessageObserver instance) {
DistributionMessageObserver oldInstance = DistributionMessageObserver.instance;
DistributionMessageObserver.instance = instance;
return oldInstance;
}
public static final DistributionMessageObserver getInstance() {
return instance;
}
/**
* Called before a the process method of the DistributionMessage is called
*
* @param dm the distribution manager that received the message
* @param message The message itself
*/
public void beforeProcessMessage(DistributionManager dm, DistributionMessage message) {
}
/**
* Called after the process method of the DistributionMessage is called
*
* @param dm the distribution manager that received the message
* @param message The message itself
*/
public void afterProcessMessage(DistributionManager dm, DistributionMessage message) {
}
/**
* Called just before a message is distributed.
*
* @param dm the distribution manager that's sending the messsage
* @param msg the message itself
*/
public void beforeSendMessage(DistributionManager dm, DistributionMessage msg) {
}
}