curator-master/curator-recipes/src/test/java/org/apache/curator/framework/client/TestResetConnectionWithBackgroundFailure.java
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 * 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.client;

import static org.junit.jupiter.api.Assertions.assertEquals;
import com.google.common.collect.Queues;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import org.apache.curator.framework.CuratorFramework;
import org.apache.curator.framework.CuratorFrameworkFactory;
import org.apache.curator.framework.recipes.leader.LeaderSelector;
import org.apache.curator.framework.recipes.leader.LeaderSelectorListener;
import org.apache.curator.framework.recipes.leader.LeaderSelectorListenerAdapter;
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.Timing;
import org.apache.curator.utils.CloseableUtils;
import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class TestResetConnectionWithBackgroundFailure extends BaseClassForTests {
    private final Logger log = LoggerFactory.getLogger(getClass());

    @Test
    public void testConnectionStateListener() throws Exception {
        server.stop();

        LeaderSelector selector = null;
        Timing timing = new Timing();
        CuratorFramework client = CuratorFrameworkFactory.newClient(
                server.getConnectString(), timing.session(), timing.connection(), new RetryOneTime(1));
        try {
            client.start();
            timing.sleepABit();

            LeaderSelectorListener listenerLeader = new LeaderSelectorListenerAdapter() {
                @Override
                public void takeLeadership(CuratorFramework client) throws Exception {
                    Thread.currentThread().join();
                }
            };
            selector = new LeaderSelector(client, "/leader", listenerLeader);
            selector.autoRequeue();
            selector.start();

            final BlockingQueue<ConnectionState> listenerSequence = Queues.newLinkedBlockingQueue();
            ConnectionStateListener listener1 = new ConnectionStateListener() {
                @Override
                public void stateChanged(CuratorFramework client, ConnectionState newState) {
                    listenerSequence.add(newState);
                }
            };

            Timing forWaiting = timing.forWaiting();

            client.getConnectionStateListenable().addListener(listener1);
            log.debug("Starting ZK server");
            server.restart();
            assertEquals(
                    listenerSequence.poll(forWaiting.milliseconds(), TimeUnit.MILLISECONDS), ConnectionState.CONNECTED);

            log.debug("Stopping ZK server");
            server.stop();
            assertEquals(
                    listenerSequence.poll(forWaiting.milliseconds(), TimeUnit.MILLISECONDS), ConnectionState.SUSPENDED);
            assertEquals(listenerSequence.poll(forWaiting.milliseconds(), TimeUnit.MILLISECONDS), ConnectionState.LOST);

            log.debug("Starting ZK server");
            server.restart();
            assertEquals(
                    listenerSequence.poll(forWaiting.milliseconds(), TimeUnit.MILLISECONDS),
                    ConnectionState.RECONNECTED);

            log.debug("Stopping ZK server");
            server.close();
            assertEquals(
                    listenerSequence.poll(forWaiting.milliseconds(), TimeUnit.MILLISECONDS), ConnectionState.SUSPENDED);
            assertEquals(listenerSequence.poll(forWaiting.milliseconds(), TimeUnit.MILLISECONDS), ConnectionState.LOST);
        } finally {
            CloseableUtils.closeQuietly(selector);
            CloseableUtils.closeQuietly(client);
        }
    }
}
