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.test;
  
  import java.io.IOException;
  import java.nio.file.Files;
  import java.util.concurrent.CountDownLatch;
  import java.util.concurrent.TimeUnit;
  import lombok.extern.slf4j.Slf4j;
  import org.apache.bookkeeper.meta.LongHierarchicalLedgerManagerFactory;
  import org.apache.bookkeeper.zookeeper.ZooKeeperClient;
  import org.apache.zookeeper.KeeperException;
  import org.apache.zookeeper.ZooKeeper;
  import org.apache.zookeeper.test.QuorumUtil;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Provides multi node zookeeper cluster.
   */
  @Slf4j
  public class ZooKeeperClusterUtil implements ZooKeeperCluster {
  
      static {
          enableZookeeperTestEnvVariables();
      }
  
      static final Logger LOG = LoggerFactory.getLogger(ZooKeeperClusterUtil.class);
      private final int numOfZKNodes;
      public QuorumUtil quorumUtil;
      String connectString;
      protected ZooKeeper zkc; // zookeeper client
  
      public static void enableZookeeperTestEnvVariables() {
          /*
           * org.apache.zookeeper.test.ClientBase uses FourLetterWordMain, from
           * 3.5.3 four letter words are disabled by default due to security
           * reasons
           */
          System.setProperty("zookeeper.4lw.commands.whitelist", "*");
          System.setProperty("zookeeper.admin.enableServer", "false");
          try {
              System.setProperty("build.test.dir", Files.createTempDirectory("zktests").toFile().getCanonicalPath());
          } catch (IOException e) {
              log.error("Failed to create temp dir, so setting build.test.dir system property to /tmp");
              System.setProperty("build.test.dir", "/tmp");
          }
      }
  
      public ZooKeeperClusterUtil(int numOfZKNodes) throws IOException, KeeperException, InterruptedException {
          if ((numOfZKNodes < 3) || (numOfZKNodes % 2 == 0)) {
              throw new IllegalArgumentException("numOfZKNodes should be atleast 3 and it should not be even number");
          }
          this.numOfZKNodes = numOfZKNodes;
      }
  
      @Override
      public String getZooKeeperConnectString() {
          return connectString;
      }
  
      @Override
      public String getMetadataServiceUri() {
          return getMetadataServiceUri("/ledgers");
      }
  
      @Override
      public String getMetadataServiceUri(String zkLedgersRootPath) {
          return getMetadataServiceUri(zkLedgersRootPath, LongHierarchicalLedgerManagerFactory.NAME);
      }
  
      @Override
      public String getMetadataServiceUri(String zkLedgersRootPath, String type) {
          /*
           * URI doesn't accept ',', for more info. check
           * AbstractConfiguration.getMetadataServiceUri()
           */
          return "zk+" + type + "://" + connectString.replace(",", ";") + zkLedgersRootPath;
      }
  
      @Override
      public ZooKeeper getZooKeeperClient() {
          return zkc;
      }
  
      @Override
      public void startCluster() throws Exception {
          // QuorumUtil will start 2*n+1 nodes.
          quorumUtil = new QuorumUtil(numOfZKNodes / 2);
          quorumUtil.startAll();
          connectString = quorumUtil.getConnString();
          // create a zookeeper client
          if (LOG.isDebugEnabled()) {
              LOG.debug("Instantiate ZK Client");
          }
          zkc = ZooKeeperClient.newBuilder().connectString(getZooKeeperConnectString()).sessionTimeoutMs(10000).build();
  
          // create default bk ensemble
          createBKEnsemble("/ledgers");
      }
  
      @Override
      public void stopCluster() throws Exception {
          if (zkc != null) {
              zkc.close();
          }
          quorumUtil.shutdownAll();
      }
  
      @Override
      public void restartCluster() throws Exception {
          quorumUtil.startAll();
      }
  
      @Override
      public void killCluster() throws Exception {
          quorumUtil.tearDown();
      }
  
      @Override
      public void sleepCluster(int time, TimeUnit timeUnit, CountDownLatch l) throws InterruptedException, IOException {
          throw new UnsupportedOperationException("sleepServer operation is not supported for ZooKeeperClusterUtil");
      }
  
      public void stopPeer(int id) throws Exception {
          quorumUtil.shutdown(id);
      }
  
      public void enableLocalSession(boolean localSessionEnabled) {
          quorumUtil.enableLocalSession(localSessionEnabled);
      }
  }
  