Examples of org.apache.zookeeper.server.NIOServerCnxnFactory

org.apache.zookeeper.server.NIOServerCnxnFactory
NIOServerCnxnFactory implements a multi-threaded ServerCnxnFactory using NIO non-blocking socket calls. Communication between threads is handled via queues. - 1 accept thread, which accepts new connections and assigns to a selector thread - 1-N selector threads, each of which selects on 1/N of the connections. The reason the factory supports more than one selector thread is that with large numbers of connections, select() itself can become a performance bottleneck. - 0-M socket I/O worker threads, which perform basic socket reads and writes. If configured with 0 worker threads, the selector threads do the socket I/O directly. - 1 connection expiration thread, which closes idle connections; this is necessary to expire connections on which no session is established. Typical (default) thread counts are: on a 32 core machine, 1 accept thread, 1 connection expiration thread, 4 selector threads, and 64 worker threads.

        tickTimeToUse = this.tickTime;
      } else {
        tickTimeToUse = TICK_TIME;
      }
      ZooKeeperServer server = new ZooKeeperServer(dir, dir, tickTimeToUse);    
      NIOServerCnxnFactory standaloneServerFactory;
      while (true) {
        try {
          standaloneServerFactory = new NIOServerCnxnFactory();
          standaloneServerFactory.configure(
            new InetSocketAddress(clientPort),
            configuration.getInt(HConstants.ZOOKEEPER_MAX_CLIENT_CNXNS,
              1000));
        } catch (BindException e) {
          LOG.info("Failed binding ZK Server to client port: " + clientPort);
          //this port is already in use. try to use another
          clientPort++;
          continue;
        }
        break;
      }
      
      // Start up this ZK server
      standaloneServerFactory.startup(server);  
      if (!waitForServerUp(clientPort, CONNECTION_TIMEOUT)) {
        throw new IOException("Waiting for startup of standalone server");
      }
      
      clientPortList.add(clientPort);

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    if (!started) {
      return;
    }
    // shut down all the zk servers
    for (int i = 0; i < standaloneServerFactoryList.size(); i++) {
      NIOServerCnxnFactory standaloneServerFactory =
        standaloneServerFactoryList.get(i);      
      int clientPort = clientPortList.get(i);
      
      standaloneServerFactory.shutdown();
      if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
        throw new IOException("Waiting for shutdown of standalone server");
      }
    }

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    if (!started || activeZKServerIndex < 0 ) {
      return -1;
    }
    
    // Shutdown the current active one
    NIOServerCnxnFactory standaloneServerFactory =
      standaloneServerFactoryList.get(activeZKServerIndex);
    int clientPort = clientPortList.get(activeZKServerIndex);
    
    standaloneServerFactory.shutdown();
    if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
      throw new IOException("Waiting for shutdown of standalone server");
    }
    
    // remove the current active zk server

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      return ;
    }
    
    int backupZKServerIndex = activeZKServerIndex+1;
    // Shutdown the current active one
    NIOServerCnxnFactory standaloneServerFactory =
      standaloneServerFactoryList.get(backupZKServerIndex);
    int clientPort = clientPortList.get(backupZKServerIndex);
    
    standaloneServerFactory.shutdown();
    if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
      throw new IOException("Waiting for shutdown of standalone server");
    }
    
    // remove this backup zk server

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        tickTimeToUse = this.tickTime;
      } else {
        tickTimeToUse = TICK_TIME;
      }
      ZooKeeperServer server = new ZooKeeperServer(dir, dir, tickTimeToUse);
      NIOServerCnxnFactory standaloneServerFactory;
      while (true) {
        try {
          standaloneServerFactory = new NIOServerCnxnFactory();
          standaloneServerFactory.configure(
            new InetSocketAddress(tentativePort), 1000);
        } catch (BindException e) {
          LOG.debug("Failed binding ZK Server to client port: " +
            tentativePort);
          // This port is already in use, try to use another.
          tentativePort++;
          continue;
        }
        break;
      }


      // Start up this ZK server
      standaloneServerFactory.startup(server);
      if (!waitForServerUp(tentativePort, CONNECTION_TIMEOUT)) {
        throw new IOException("Waiting for startup of standalone server");
      }


      // We have selected this port as a client port.

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    if (!started) {
      return;
    }
    // shut down all the zk servers
    for (int i = 0; i < standaloneServerFactoryList.size(); i++) {
      NIOServerCnxnFactory standaloneServerFactory =
        standaloneServerFactoryList.get(i);
      int clientPort = clientPortList.get(i);


      standaloneServerFactory.shutdown();
      if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
        throw new IOException("Waiting for shutdown of standalone server");
      }
    }

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    if (!started || activeZKServerIndex < 0) {
      return -1;
    }


    // Shutdown the current active one
    NIOServerCnxnFactory standaloneServerFactory =
      standaloneServerFactoryList.get(activeZKServerIndex);
    int clientPort = clientPortList.get(activeZKServerIndex);


    standaloneServerFactory.shutdown();
    if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
      throw new IOException("Waiting for shutdown of standalone server");
    }


    // remove the current active zk server

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      return;
    }


    int backupZKServerIndex = activeZKServerIndex + 1;
    // Shutdown the current active one
    NIOServerCnxnFactory standaloneServerFactory =
      standaloneServerFactoryList.get(backupZKServerIndex);
    int clientPort = clientPortList.get(backupZKServerIndex);


    standaloneServerFactory.shutdown();
    if (!waitForServerDown(clientPort, CONNECTION_TIMEOUT)) {
      throw new IOException("Waiting for shutdown of standalone server");
    }


    // remove this backup zk server

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     * ZOOKEEPR-1382 test class
     */
    @Test
    public void testWatchesWithClientSessionTimeout() throws Exception {


        NIOServerCnxnFactory serverCnxnFactory = new NIOServerCnxnFactory();


        ZKDatabase database = new ZKDatabase(null);
        database.setlastProcessedZxid(2L);
        QuorumPeer quorumPeer = mock(QuorumPeer.class);
        FileTxnSnapLog logfactory = mock(FileTxnSnapLog.class);

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    log.info("Starting embedded zookeeper server on port " + clientPort);
    ZooKeeperServer zooKeeperServer = new ZooKeeperServer();
    configure(zooKeeperServer, config);


    this.connectionFactory = new NIOServerCnxnFactory();
    this.connectionFactory.configure(config.getClientPortAddress(), config.getMaxClientCnxns());
    try {
      this.connectionFactory.startup(zooKeeperServer);
    } catch (InterruptedException e) {
      throw new RuntimeException("Server Interrupted", e);

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