| /* |
| * 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_examples.durableMessaging; |
| |
| import static org.apache.geode.distributed.ConfigurationProperties.DURABLE_CLIENT_ID; |
| import static org.apache.geode.distributed.ConfigurationProperties.DURABLE_CLIENT_TIMEOUT; |
| import static org.apache.geode.distributed.ConfigurationProperties.LOG_LEVEL; |
| |
| import java.util.concurrent.CountDownLatch; |
| |
| import org.apache.geode.cache.EntryEvent; |
| import org.apache.geode.cache.InterestResultPolicy; |
| import org.apache.geode.cache.Region; |
| import org.apache.geode.cache.client.ClientCache; |
| import org.apache.geode.cache.client.ClientCacheFactory; |
| import org.apache.geode.cache.client.ClientRegionFactory; |
| import org.apache.geode.cache.client.ClientRegionShortcut; |
| import org.apache.geode.cache.util.CacheListenerAdapter; |
| |
| public class Example { |
| private static final int numEvents = 10; |
| private static final CountDownLatch waitForEventsLatch = new CountDownLatch(numEvents); |
| |
| public static void main(String[] args) throws Exception { |
| ClientCache clientCacheOne = createDurableClient(); |
| |
| final String regionName = "example-region"; |
| |
| // Create a local caching proxy region that matches the server region |
| ClientRegionFactory<Integer, String> clientOneRegionFactory = |
| clientCacheOne.createClientRegionFactory(ClientRegionShortcut.PROXY); |
| Region<Integer, String> exampleClientRegionOne = clientOneRegionFactory.create(regionName); |
| |
| // Register interest to create the durable client message queue |
| exampleClientRegionOne.registerInterestForAllKeys(InterestResultPolicy.DEFAULT, true); |
| |
| // Close the client cache with keepalive set to true so |
| // the durable client messages are preserved |
| // for the duration of the configured timeout. In practice, |
| // it is more likely the client would disconnect |
| // due to a temporary network issue, but for this example the cache is explicitly closed. |
| clientCacheOne.close(true); |
| |
| // Create a second client to do puts with while the first client is disconnected |
| ClientCache clientCacheTwo = new ClientCacheFactory().addPoolLocator("127.0.0.1", 10334) |
| .set("log-level", "WARN").create(); |
| |
| ClientRegionFactory<Integer, String> clientTwoRegionFactory = |
| clientCacheTwo.createClientRegionFactory(ClientRegionShortcut.PROXY); |
| Region<Integer, String> exampleClientRegionTwo = clientTwoRegionFactory.create(regionName); |
| |
| for (int i = 0; i < numEvents; ++i) { |
| exampleClientRegionTwo.put(i, "testValue" + i); |
| } |
| |
| // Close the second client and restart the durable client |
| clientCacheTwo.close(false); |
| |
| clientCacheOne = createDurableClient(); |
| |
| // Add an example cache listener so this client can react |
| // when the server sends this client's events from the |
| // durable message queue. This isn't required but helps |
| // illustrate that the events are delivered successfully. |
| clientOneRegionFactory = clientCacheOne.createClientRegionFactory(ClientRegionShortcut.PROXY); |
| exampleClientRegionOne = clientOneRegionFactory |
| .addCacheListener(new ExampleCacheListener<Integer, String>()).create(regionName); |
| |
| // Signal to the server that this client is ready to receive events. |
| // Events in this client's durable message queue |
| // will then be delivered and trigger our example cache listener. |
| clientCacheOne.readyForEvents(); |
| |
| // Use a count down latch to ensure that this client receives all queued events from the server |
| waitForEventsLatch.await(); |
| } |
| |
| private static ClientCache createDurableClient() { |
| return new ClientCacheFactory().addPoolLocator("127.0.0.1", 10334) |
| // Provide a unique identifier for this client's durable subscription message queue |
| .set(DURABLE_CLIENT_ID, "1") |
| // Provide a timeout in seconds for how long the server will wait for the client to |
| // reconnect. |
| // If this property isn't set explicitly, it defaults to 300 seconds. |
| .set(DURABLE_CLIENT_TIMEOUT, "200") |
| // This is required so the client can register interest for all keys on this durable client |
| .setPoolSubscriptionEnabled(true).set(LOG_LEVEL, "WARN").create(); |
| } |
| |
| public static class ExampleCacheListener<Integer, String> |
| extends CacheListenerAdapter<Integer, String> { |
| public ExampleCacheListener() {} |
| |
| @Override |
| public void afterCreate(EntryEvent<Integer, String> event) { |
| System.out.println( |
| "Received create for key " + event.getKey() + " after durable client reconnection"); |
| waitForEventsLatch.countDown(); |
| } |
| } |
| } |