curator-master/curator-client/src/test/java/org/apache/curator/TestSessionFailRetryLoop.java
/*
 * 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;

import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import static org.junit.jupiter.api.Assertions.fail;
import java.util.concurrent.Callable;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.curator.retry.ExponentialBackoffRetry;
import org.apache.curator.test.BaseClassForTests;
import org.apache.curator.test.Timing;
import org.apache.curator.utils.CloseableUtils;
import org.junit.jupiter.api.Test;

public class TestSessionFailRetryLoop extends BaseClassForTests {
    @Test
    public void testRetry() throws Exception {
        Timing timing = new Timing();
        final CuratorZookeeperClient client = new CuratorZookeeperClient(
                server.getConnectString(),
                timing.session(),
                timing.connection(),
                null,
                new ExponentialBackoffRetry(100, 3));
        SessionFailRetryLoop retryLoop = client.newSessionFailRetryLoop(SessionFailRetryLoop.Mode.RETRY);
        retryLoop.start();
        try {
            client.start();
            final AtomicBoolean secondWasDone = new AtomicBoolean(false);
            final AtomicBoolean firstTime = new AtomicBoolean(true);
            while (retryLoop.shouldContinue()) {
                try {
                    RetryLoop.callWithRetry(client, new Callable<Void>() {
                        @Override
                        public Void call() throws Exception {
                            if (firstTime.compareAndSet(true, false)) {
                                assertNull(client.getZooKeeper().exists("/foo/bar", false));
                                client.getZooKeeper().getTestable().injectSessionExpiration();
                                client.getZooKeeper();
                                client.blockUntilConnectedOrTimedOut();
                            }

                            assertNull(client.getZooKeeper().exists("/foo/bar", false));
                            return null;
                        }
                    });

                    RetryLoop.callWithRetry(client, new Callable<Void>() {
                        @Override
                        public Void call() throws Exception {
                            assertFalse(firstTime.get());
                            assertNull(client.getZooKeeper().exists("/foo/bar", false));
                            secondWasDone.set(true);
                            return null;
                        }
                    });
                } catch (Exception e) {
                    retryLoop.takeException(e);
                }
            }

            assertTrue(secondWasDone.get());
        } finally {
            retryLoop.close();
            CloseableUtils.closeQuietly(client);
        }
    }

    @Test
    public void testRetryStatic() throws Exception {
        Timing timing = new Timing();
        final CuratorZookeeperClient client = new CuratorZookeeperClient(
                server.getConnectString(),
                timing.session(),
                timing.connection(),
                null,
                new ExponentialBackoffRetry(100, 3));
        SessionFailRetryLoop retryLoop = client.newSessionFailRetryLoop(SessionFailRetryLoop.Mode.RETRY);
        retryLoop.start();
        try {
            client.start();
            final AtomicBoolean secondWasDone = new AtomicBoolean(false);
            final AtomicBoolean firstTime = new AtomicBoolean(true);
            SessionFailRetryLoop.callWithRetry(client, SessionFailRetryLoop.Mode.RETRY, new Callable<Object>() {
                @Override
                public Object call() throws Exception {
                    RetryLoop.callWithRetry(client, new Callable<Void>() {
                        @Override
                        public Void call() throws Exception {
                            if (firstTime.compareAndSet(true, false)) {
                                assertNull(client.getZooKeeper().exists("/foo/bar", false));
                                client.getZooKeeper().getTestable().injectSessionExpiration();
                                client.getZooKeeper();
                                client.blockUntilConnectedOrTimedOut();
                            }

                            assertNull(client.getZooKeeper().exists("/foo/bar", false));
                            return null;
                        }
                    });

                    RetryLoop.callWithRetry(client, new Callable<Void>() {
                        @Override
                        public Void call() throws Exception {
                            assertFalse(firstTime.get());
                            assertNull(client.getZooKeeper().exists("/foo/bar", false));
                            secondWasDone.set(true);
                            return null;
                        }
                    });
                    return null;
                }
            });

            assertTrue(secondWasDone.get());
        } finally {
            retryLoop.close();
            CloseableUtils.closeQuietly(client);
        }
    }

    @Test
    public void testBasic() throws Exception {
        final Timing timing = new Timing();
        final CuratorZookeeperClient client = new CuratorZookeeperClient(
                server.getConnectString(),
                timing.session(),
                timing.connection(),
                null,
                new ExponentialBackoffRetry(100, 3));
        SessionFailRetryLoop retryLoop = client.newSessionFailRetryLoop(SessionFailRetryLoop.Mode.FAIL);
        retryLoop.start();
        try {
            client.start();
            try {
                while (retryLoop.shouldContinue()) {
                    try {
                        RetryLoop.callWithRetry(client, new Callable<Void>() {
                            @Override
                            public Void call() throws Exception {
                                assertNull(client.getZooKeeper().exists("/foo/bar", false));
                                client.getZooKeeper().getTestable().injectSessionExpiration();

                                timing.sleepABit();

                                client.getZooKeeper();
                                client.blockUntilConnectedOrTimedOut();
                                assertNull(client.getZooKeeper().exists("/foo/bar", false));
                                return null;
                            }
                        });
                    } catch (Exception e) {
                        retryLoop.takeException(e);
                    }
                }

                fail();
            } catch (SessionFailRetryLoop.SessionFailedException dummy) {
                // correct
            }
        } finally {
            retryLoop.close();
            CloseableUtils.closeQuietly(client);
        }
    }

    @Test
    public void testBasicStatic() throws Exception {
        Timing timing = new Timing();
        final CuratorZookeeperClient client = new CuratorZookeeperClient(
                server.getConnectString(),
                timing.session(),
                timing.connection(),
                null,
                new ExponentialBackoffRetry(100, 3));
        SessionFailRetryLoop retryLoop = client.newSessionFailRetryLoop(SessionFailRetryLoop.Mode.FAIL);
        retryLoop.start();
        try {
            client.start();
            try {
                SessionFailRetryLoop.callWithRetry(client, SessionFailRetryLoop.Mode.FAIL, new Callable<Object>() {
                    @Override
                    public Object call() throws Exception {
                        RetryLoop.callWithRetry(client, new Callable<Void>() {
                            @Override
                            public Void call() throws Exception {
                                assertNull(client.getZooKeeper().exists("/foo/bar", false));
                                client.getZooKeeper().getTestable().injectSessionExpiration();

                                client.getZooKeeper();
                                client.blockUntilConnectedOrTimedOut();
                                assertNull(client.getZooKeeper().exists("/foo/bar", false));
                                return null;
                            }
                        });
                        return null;
                    }
                });
            } catch (SessionFailRetryLoop.SessionFailedException dummy) {
                // correct
            }
        } finally {
            retryLoop.close();
            CloseableUtils.closeQuietly(client);
        }
    }
}
