| /* |
| * 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; |
| |
| import org.apache.geode.annotations.internal.MutableForTesting; |
| |
| /** |
| * This class is a test hook to intercept messages in the VM receiving the message. |
| */ |
| public abstract class DistributionMessageObserver { |
| |
| @MutableForTesting |
| private static DistributionMessageObserver instance; |
| |
| /** |
| * Set the instance of the observer. Setting to null will clear the observer. |
| * |
| * @return the old observer, or null if there was no old observer. |
| */ |
| public static DistributionMessageObserver setInstance(DistributionMessageObserver instance) { |
| DistributionMessageObserver oldInstance = DistributionMessageObserver.instance; |
| DistributionMessageObserver.instance = instance; |
| return oldInstance; |
| } |
| |
| public static 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(ClusterDistributionManager dm, DistributionMessage message) { |
| // override as needed |
| } |
| |
| /** |
| * 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(ClusterDistributionManager dm, DistributionMessage message) { |
| // override as needed |
| } |
| |
| /** |
| * Called just before a message is distributed. |
| * |
| * @param dm the distribution manager that's sending the message |
| * @param message the message itself |
| */ |
| public void beforeSendMessage(ClusterDistributionManager dm, DistributionMessage message) { |
| // override as needed |
| } |
| } |