| /** |
| * 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.curator.framework.ensemble; |
| |
| import static org.junit.jupiter.api.Assertions.assertTrue; |
| |
| import org.apache.curator.ensemble.EnsembleProvider; |
| import org.apache.curator.framework.CuratorFramework; |
| import org.apache.curator.framework.CuratorFrameworkFactory; |
| import org.apache.curator.framework.state.ConnectionState; |
| import org.apache.curator.framework.state.ConnectionStateListener; |
| import org.apache.curator.retry.RetryOneTime; |
| import org.apache.curator.test.BaseClassForTests; |
| import org.apache.curator.test.TestingServer; |
| import org.apache.curator.test.Timing; |
| import org.apache.curator.utils.CloseableUtils; |
| import org.junit.jupiter.api.Test; |
| |
| import java.util.concurrent.CountDownLatch; |
| import java.util.concurrent.Semaphore; |
| |
| public class TestEnsembleProvider extends BaseClassForTests |
| { |
| private final Timing timing = new Timing(); |
| |
| @Test |
| public void testBasic() |
| { |
| Semaphore counter = new Semaphore(0); |
| final CuratorFramework client = newClient(counter); |
| try |
| { |
| client.start(); |
| assertTrue(timing.acquireSemaphore(counter)); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(client); |
| } |
| } |
| |
| @Test |
| public void testAfterSessionExpiration() throws Exception |
| { |
| TestingServer oldServer = server; |
| Semaphore counter = new Semaphore(0); |
| final CuratorFramework client = newClient(counter); |
| try |
| { |
| final CountDownLatch connectedLatch = new CountDownLatch(1); |
| final CountDownLatch lostLatch = new CountDownLatch(1); |
| final CountDownLatch reconnectedLatch = new CountDownLatch(1); |
| ConnectionStateListener listener = new ConnectionStateListener() |
| { |
| @Override |
| public void stateChanged(CuratorFramework client, ConnectionState newState) |
| { |
| if ( newState == ConnectionState.CONNECTED ) |
| { |
| connectedLatch.countDown(); |
| } |
| if ( newState == ConnectionState.LOST ) |
| { |
| lostLatch.countDown(); |
| } |
| if ( newState == ConnectionState.RECONNECTED ) |
| { |
| reconnectedLatch.countDown(); |
| } |
| } |
| }; |
| client.getConnectionStateListenable().addListener(listener); |
| client.start(); |
| |
| assertTrue(timing.awaitLatch(connectedLatch)); |
| |
| server.stop(); |
| |
| assertTrue(timing.awaitLatch(lostLatch)); |
| counter.drainPermits(); |
| for ( int i = 0; i < 5; ++i ) |
| { |
| // the ensemble provider should still be called periodically when the connection is lost |
| assertTrue(timing.acquireSemaphore(counter), "Failed when i is: " + i); |
| } |
| |
| server = new TestingServer(); // this changes the CountingEnsembleProvider's value for getConnectionString() - connection should notice this and recover |
| assertTrue(timing.awaitLatch(reconnectedLatch)); |
| } |
| finally |
| { |
| CloseableUtils.closeQuietly(client); |
| CloseableUtils.closeQuietly(oldServer); |
| } |
| } |
| |
| private CuratorFramework newClient(Semaphore counter) |
| { |
| return CuratorFrameworkFactory.builder() |
| .ensembleProvider(new CountingEnsembleProvider(counter)) |
| .sessionTimeoutMs(timing.session()) |
| .connectionTimeoutMs(timing.connection()) |
| .retryPolicy(new RetryOneTime(1)) |
| .build(); |
| } |
| |
| private class CountingEnsembleProvider implements EnsembleProvider |
| { |
| private final Semaphore getConnectionStringCounter; |
| |
| public CountingEnsembleProvider(Semaphore getConnectionStringCounter) |
| { |
| this.getConnectionStringCounter = getConnectionStringCounter; |
| } |
| |
| @Override |
| public void start() |
| { |
| // NOP |
| } |
| |
| @Override |
| public String getConnectionString() |
| { |
| getConnectionStringCounter.release(); |
| return server.getConnectString(); |
| } |
| |
| @Override |
| public void close() |
| { |
| // NOP |
| } |
| |
| @Override |
| public void setConnectionString(String connectionString) |
| { |
| // NOP |
| } |
| |
| @Override |
| public boolean updateServerListEnabled() |
| { |
| return false; |
| } |
| } |
| } |