content: /*
   *
   * 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.bookkeeper.replication;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertNotNull;
  import static org.junit.Assert.assertTrue;
  
  import java.io.IOException;
  import java.util.concurrent.TimeUnit;
  import org.apache.bookkeeper.bookie.BookieImpl;
  import org.apache.bookkeeper.meta.zk.ZKMetadataClientDriver;
  import org.apache.bookkeeper.net.BookieId;
  import org.apache.bookkeeper.test.BookKeeperClusterTestCase;
  import org.apache.bookkeeper.util.TestUtils;
  import org.apache.zookeeper.ZooKeeper;
  import org.awaitility.Awaitility;
  import org.junit.Test;
  
  /**
   * Test the AuditorPeer.
   */
  public class AutoRecoveryMainTest extends BookKeeperClusterTestCase {
  
      public AutoRecoveryMainTest() {
          super(3);
      }
  
      /**
       * Test the startup of the auditorElector and RW.
       */
      @Test
      public void testStartup() throws Exception {
          AutoRecoveryMain main = new AutoRecoveryMain(confByIndex(0));
          try {
              main.start();
              Thread.sleep(500);
              assertTrue("AuditorElector should be running",
                      main.auditorElector.isRunning());
              assertTrue("Replication worker should be running",
                      main.replicationWorker.isRunning());
          } finally {
              main.shutdown();
          }
      }
  
      /*
       * Test the shutdown of all daemons
       */
      @Test
      public void testShutdown() throws Exception {
          AutoRecoveryMain main = new AutoRecoveryMain(confByIndex(0));
          main.start();
          Thread.sleep(500);
          assertTrue("AuditorElector should be running",
                  main.auditorElector.isRunning());
          assertTrue("Replication worker should be running",
                  main.replicationWorker.isRunning());
  
          main.shutdown();
          assertFalse("AuditorElector should not be running",
                  main.auditorElector.isRunning());
          assertFalse("Replication worker should not be running",
                  main.replicationWorker.isRunning());
      }
  
      /**
       * Test that, if an autorecovery looses its ZK connection/session it will
       * shutdown.
       */
      @Test
      public void testAutoRecoverySessionLoss() throws Exception {
          /*
           * initialize three AutoRecovery instances.
           */
          AutoRecoveryMain main1 = new AutoRecoveryMain(confByIndex(0));
          AutoRecoveryMain main2 = new AutoRecoveryMain(confByIndex(1));
          AutoRecoveryMain main3 = new AutoRecoveryMain(confByIndex(2));
  
          /*
           * start main1, make sure all the components are started and main1 is
           * the current Auditor
           */
          ZKMetadataClientDriver zkMetadataClientDriver1 = startAutoRecoveryMain(main1);
          ZooKeeper zk1 = zkMetadataClientDriver1.getZk();
  
          // Wait until auditor gets elected
          for (int i = 0; i < 10; i++) {
              try {
                  if (main1.auditorElector.getCurrentAuditor() != null) {
                      break;
                  } else {
                      Thread.sleep(1000);
                  }
              } catch (IOException e) {
                  Thread.sleep(1000);
              }
          }
          BookieId currentAuditor = main1.auditorElector.getCurrentAuditor();
          assertNotNull(currentAuditor);
          Auditor auditor1 = main1.auditorElector.getAuditor();
          assertEquals("Current Auditor should be AR1", currentAuditor, BookieImpl.getBookieId(confByIndex(0)));
          Awaitility.waitAtMost(30, TimeUnit.SECONDS).untilAsserted(() -> {
              assertNotNull(auditor1);
              assertTrue("Auditor of AR1 should be running", auditor1.isRunning());
          });
  
  
          /*
           * start main2 and main3
           */
          ZKMetadataClientDriver zkMetadataClientDriver2 = startAutoRecoveryMain(main2);
          ZooKeeper zk2 = zkMetadataClientDriver2.getZk();
          ZKMetadataClientDriver zkMetadataClientDriver3 = startAutoRecoveryMain(main3);
          ZooKeeper zk3 = zkMetadataClientDriver3.getZk();
  
          /*
           * make sure AR1 is still the current Auditor and AR2's and AR3's
           * auditors are not running.
           */
          assertEquals("Current Auditor should still be AR1", currentAuditor, BookieImpl.getBookieId(confByIndex(0)));
          Awaitility.await().untilAsserted(() -> {
              assertTrue("AR2's Auditor should not be running", (main2.auditorElector.getAuditor() == null
                      || !main2.auditorElector.getAuditor().isRunning()));
              assertTrue("AR3's Auditor should not be running", (main3.auditorElector.getAuditor() == null
                      || !main3.auditorElector.getAuditor().isRunning()));
          });
  
  
          /*
           * expire zk2 and zk1 sessions.
           */
          zkUtil.expireSession(zk2);
          zkUtil.expireSession(zk1);
  
          /*
           * wait for some time for all the components of AR1 and AR2 are
           * shutdown.
           */
          for (int i = 0; i < 10; i++) {
              if (!main1.auditorElector.isRunning() && !main1.replicationWorker.isRunning()
                      && !main1.isAutoRecoveryRunning() && !main2.auditorElector.isRunning()
                      && !main2.replicationWorker.isRunning() && !main2.isAutoRecoveryRunning()) {
                  break;
              }
              Thread.sleep(1000);
          }
  
          /*
           * the AR3 should be current auditor.
           */
          currentAuditor = main3.auditorElector.getCurrentAuditor();
          assertEquals("Current Auditor should be AR3", currentAuditor, BookieImpl.getBookieId(confByIndex(2)));
          Awaitility.await().untilAsserted(() -> {
              assertNotNull(main3.auditorElector.getAuditor());
              assertTrue("Auditor of AR3 should be running", main3.auditorElector.getAuditor().isRunning());
          });
  
          Awaitility.await().untilAsserted(() -> {
              /*
               * since AR3 is current auditor, AR1's auditor should not be running
               * anymore.
               */
              assertFalse("AR1's auditor should not be running", auditor1.isRunning());
  
              /*
               * components of AR2 and AR3 should not be running since zk1 and zk2
               * sessions are expired.
               */
              assertFalse("Elector1 should have shutdown", main1.auditorElector.isRunning());
              assertFalse("RW1 should have shutdown", main1.replicationWorker.isRunning());
              assertFalse("AR1 should have shutdown", main1.isAutoRecoveryRunning());
              assertFalse("Elector2 should have shutdown", main2.auditorElector.isRunning());
              assertFalse("RW2 should have shutdown", main2.replicationWorker.isRunning());
              assertFalse("AR2 should have shutdown", main2.isAutoRecoveryRunning());
          });
  
      }
  
      /*
       * start autoRecoveryMain and make sure all its components are running and
       * myVote node is existing
       */
      ZKMetadataClientDriver startAutoRecoveryMain(AutoRecoveryMain autoRecoveryMain) throws Exception {
          autoRecoveryMain.start();
          ZKMetadataClientDriver metadataClientDriver = (ZKMetadataClientDriver) autoRecoveryMain.bkc
                  .getMetadataClientDriver();
          TestUtils.assertEventuallyTrue("autoRecoveryMain components should be running",
                  () -> autoRecoveryMain.auditorElector.isRunning()
                          && autoRecoveryMain.replicationWorker.isRunning() && autoRecoveryMain.isAutoRecoveryRunning());
          return metadataClientDriver;
      }
  }
  