Java Event类代码示例

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
/**
 * verify becomeStandby is not called if already in standby
 */
@Test
public void testSuccessiveStandbyCalls() {
  elector.joinElection(data);

  // make the object go into the monitoring standby state
  elector.processResult(Code.NODEEXISTS.intValue(), ZK_LOCK_NAME, mockZK,
      ZK_LOCK_NAME);
  Mockito.verify(mockApp, Mockito.times(1)).becomeStandby();
  verifyExistCall(1);
  Assert.assertTrue(elector.isMonitorLockNodePending());

  Stat stat = new Stat();
  stat.setEphemeralOwner(0L);
  Mockito.when(mockZK.getSessionId()).thenReturn(1L);
  elector.processResult(Code.OK.intValue(), ZK_LOCK_NAME, mockZK, stat);
  Assert.assertFalse(elector.isMonitorLockNodePending());

  WatchedEvent mockEvent = Mockito.mock(WatchedEvent.class);
  Mockito.when(mockEvent.getPath()).thenReturn(ZK_LOCK_NAME);

  // notify node deletion
  // monitoring should be setup again after event is received
  Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.NodeDeleted);
  elector.processWatchEvent(mockZK, mockEvent);
  // is standby. no need to notify anything now
  Mockito.verify(mockApp, Mockito.times(0)).enterNeutralMode();
  // another joinElection called.
  Mockito.verify(mockZK, Mockito.times(2)).create(ZK_LOCK_NAME, data,
      Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL, elector, mockZK);
  // lost election
  elector.processResult(Code.NODEEXISTS.intValue(), ZK_LOCK_NAME, mockZK,
      ZK_LOCK_NAME);
  // still standby. so no need to notify again
  Mockito.verify(mockApp, Mockito.times(1)).becomeStandby();
  // monitor is set again
  verifyExistCall(2);
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
/**
 * joinElection(..) should happen only after SERVICE_HEALTHY.
 */
@Test
public void testBecomeActiveBeforeServiceHealthy() throws Exception {
  mockNoPriorActive();
  WatchedEvent mockEvent = Mockito.mock(WatchedEvent.class);
  Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.None);
  // session expired should enter safe mode
  // But for first time, before the SERVICE_HEALTY i.e. appData is set,
  // should not enter the election.
  Mockito.when(mockEvent.getState()).thenReturn(Event.KeeperState.Expired);
  elector.processWatchEvent(mockZK, mockEvent);
  // joinElection should not be called.
  Mockito.verify(mockZK, Mockito.times(0)).create(ZK_LOCK_NAME, null,
      Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL, elector, mockZK);
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
private void startConnect() throws IOException {
    state = States.CONNECTING;

    InetSocketAddress addr;
    if (rwServerAddress != null) {
        addr = rwServerAddress;
        rwServerAddress = null;
    } else {
        addr = hostProvider.next(1000);
    }

    setName(getName().replaceAll("\\(.*\\)",
            "(" + addr.getHostName() + ":" + addr.getPort() + ")"));
    if (ZooKeeperSaslClient.isEnabled()) {
        try {
            String principalUserName = System.getProperty(
                    ZK_SASL_CLIENT_USERNAME, "zookeeper");
            zooKeeperSaslClient =
                new ZooKeeperSaslClient(
                        principalUserName+"/"+addr.getHostName());
        } catch (LoginException e) {
            // An authentication error occurred when the SASL client tried to initialize:
            // for Kerberos this means that the client failed to authenticate with the KDC.
            // This is different from an authentication error that occurs during communication
            // with the Zookeeper server, which is handled below.
            LOG.warn("SASL configuration failed: " + e + " Will continue connection to Zookeeper server without "
              + "SASL authentication, if Zookeeper server allows it.");
            eventThread.queueEvent(new WatchedEvent(
              Watcher.Event.EventType.None,
              Watcher.Event.KeeperState.AuthFailed, null));
            saslLoginFailed = true;
        }
    }
    logStartConnect(addr);

    clientCnxnSocket.connect(addr);
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
/**
 * Callback invoked by the ClientCnxnSocket once a connection has been
 * established.
 * 
 * @param _negotiatedSessionTimeout
 * @param _sessionId
 * @param _sessionPasswd
 * @param isRO
 * @throws IOException
 */
void onConnected(int _negotiatedSessionTimeout, long _sessionId,
        byte[] _sessionPasswd, boolean isRO) throws IOException {
    negotiatedSessionTimeout = _negotiatedSessionTimeout;
    if (negotiatedSessionTimeout <= 0) {
        state = States.CLOSED;

        eventThread.queueEvent(new WatchedEvent(
                Watcher.Event.EventType.None,
                Watcher.Event.KeeperState.Expired, null));
        eventThread.queueEventOfDeath();

        String warnInfo;
        warnInfo = "Unable to reconnect to ZooKeeper service, session 0x"
            + Long.toHexString(sessionId) + " has expired";
        LOG.warn(warnInfo);
        throw new SessionExpiredException(warnInfo);
    }
    if (!readOnly && isRO) {
        LOG.error("Read/write client got connected to read-only server");
    }
    readTimeout = negotiatedSessionTimeout * 2 / 3;
    connectTimeout = negotiatedSessionTimeout / hostProvider.size();
    hostProvider.onConnected();
    sessionId = _sessionId;
    sessionPasswd = _sessionPasswd;
    state = (isRO) ?
            States.CONNECTEDREADONLY : States.CONNECTED;
    seenRwServerBefore |= !isRO;
    LOG.info("Session establishment complete on server "
            + clientCnxnSocket.getRemoteSocketAddress()
            + ", sessionid = 0x" + Long.toHexString(sessionId)
            + ", negotiated timeout = " + negotiatedSessionTimeout
            + (isRO ? " (READ-ONLY mode)" : ""));
    KeeperState eventState = (isRO) ?
            KeeperState.ConnectedReadOnly : KeeperState.SyncConnected;
    eventThread.queueEvent(new WatchedEvent(
            Watcher.Event.EventType.None,
            eventState, null));
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
public void process(WatchedEvent event) {
    super.process(event);
    if (event.getType() != Event.EventType.None) {
        try {
            events.put(event);
        } catch (InterruptedException e) {
            LOG.warn("ignoring interrupt during event.put");
        }
    }
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
void queueEvent(String clientPath, int err,
        Set<Watcher> materializedWatchers, EventType eventType) {
    KeeperState sessionState = KeeperState.SyncConnected;
    if (KeeperException.Code.SESSIONEXPIRED.intValue() == err
            || KeeperException.Code.CONNECTIONLOSS.intValue() == err) {
        sessionState = Event.KeeperState.Disconnected;
    }
    WatchedEvent event = new WatchedEvent(eventType, sessionState,
            clientPath);
    eventThread.queueEvent(event, materializedWatchers);
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
public void process(WatchedEvent event) {
    super.process(event);
    if (event.getType() != Event.EventType.None) {
        timeOfLastWatcherInvocation = System.currentTimeMillis();
        try {
            events.put(event);
        } catch (InterruptedException e) {
            LOG.warn("ignoring interrupt during event.put");
        }
    }
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
/**
 * verify becomeStandby is not called if already in standby
 */
@Test
public void testSuccessiveStandbyCalls() {
  elector.joinElection(data);

  // make the object go into the monitoring standby state
  elector.processResult(Code.NODEEXISTS.intValue(), ZK_LOCK_NAME, mockZK,
      ZK_LOCK_NAME);
  Mockito.verify(mockApp, Mockito.times(1)).becomeStandby();
  verifyExistCall(1);

  WatchedEvent mockEvent = Mockito.mock(WatchedEvent.class);
  Mockito.when(mockEvent.getPath()).thenReturn(ZK_LOCK_NAME);

  // notify node deletion
  // monitoring should be setup again after event is received
  Mockito.when(mockEvent.getType()).thenReturn(Event.EventType.NodeDeleted);
  elector.processWatchEvent(mockZK, mockEvent);
  // is standby. no need to notify anything now
  Mockito.verify(mockApp, Mockito.times(0)).enterNeutralMode();
  // another joinElection called.
  Mockito.verify(mockZK, Mockito.times(2)).create(ZK_LOCK_NAME, data,
      Ids.OPEN_ACL_UNSAFE, CreateMode.EPHEMERAL, elector, mockZK);
  // lost election
  elector.processResult(Code.NODEEXISTS.intValue(), ZK_LOCK_NAME, mockZK,
      ZK_LOCK_NAME);
  // still standby. so no need to notify again
  Mockito.verify(mockApp, Mockito.times(1)).becomeStandby();
  // monitor is set again
  verifyExistCall(2);
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
private void startConnect() throws IOException {
    state = States.CONNECTING;

    InetSocketAddress addr;
    if (rwServerAddress != null) {
        addr = rwServerAddress;
        rwServerAddress = null;
    } else {
        addr = hostProvider.next(1000);
    }

    setName(getName().replaceAll("\\(.*\\)",
            "(" + addr.getHostName() + ":" + addr.getPort() + ")"));
    try {
        zooKeeperSaslClient = new ZooKeeperSaslClient("zookeeper/"+addr.getHostName());
    } catch (LoginException e) {
        // An authentication error occurred when the SASL client tried to initialize:
        // for Kerberos this means that the client failed to authenticate with the KDC.
        // This is different from an authentication error that occurs during communication
        // with the Zookeeper server, which is handled below.
        LOG.warn("SASL configuration failed: " + e + " Will continue connection to Zookeeper server without "
          + "SASL authentication, if Zookeeper server allows it.");
        eventThread.queueEvent(new WatchedEvent(
          Watcher.Event.EventType.None,
          Watcher.Event.KeeperState.AuthFailed, null));
        saslLoginFailed = true;
    }
    logStartConnect(addr);

    clientCnxnSocket.connect(addr);
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
/**
 * Callback invoked by the ClientCnxnSocket once a connection has been
 * established.
 * 
 * @param _negotiatedSessionTimeout
 * @param _sessionId
 * @param _sessionPasswd
 * @param isRO
 * @throws IOException
 */
void onConnected(int _negotiatedSessionTimeout, long _sessionId,
        byte[] _sessionPasswd, boolean isRO) throws IOException {
    negotiatedSessionTimeout = _negotiatedSessionTimeout;
    if (negotiatedSessionTimeout <= 0) {
        state = States.CLOSED;

        eventThread.queueEvent(new WatchedEvent(
                Watcher.Event.EventType.None,
                Watcher.Event.KeeperState.Expired, null));
        eventThread.queueEventOfDeath();
        throw new SessionExpiredException(
                "Unable to reconnect to ZooKeeper service, session 0x"
                        + Long.toHexString(sessionId) + " has expired");
    }
    if (!readOnly && isRO) {
        LOG.error("Read/write client got connected to read-only server");
    }
    readTimeout = negotiatedSessionTimeout * 2 / 3;
    connectTimeout = negotiatedSessionTimeout / hostProvider.size();
    hostProvider.onConnected();
    sessionId = _sessionId;
    sessionPasswd = _sessionPasswd;
    state = (isRO) ?
            States.CONNECTEDREADONLY : States.CONNECTED;
    seenRwServerBefore |= !isRO;
    LOG.info("Session establishment complete on server "
            + clientCnxnSocket.getRemoteSocketAddress()
            + ", sessionid = 0x" + Long.toHexString(sessionId)
            + ", negotiated timeout = " + negotiatedSessionTimeout
            + (isRO ? " (READ-ONLY mode)" : ""));
    KeeperState eventState = (isRO) ?
            KeeperState.ConnectedReadOnly : KeeperState.SyncConnected;
    eventThread.queueEvent(new WatchedEvent(
            Watcher.Event.EventType.None,
            eventState, null));
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
private void startConnect() throws IOException {
    state = States.CONNECTING;

    InetSocketAddress addr;
    if (rwServerAddress != null) {
        addr = rwServerAddress;
        rwServerAddress = null;
    } else {
        addr = hostProvider.next(1000);
    }

    setName(getName().replaceAll("\\(.*\\)",
            "(" + addr.getHostName() + ":" + addr.getPort() + ")"));
    try {
        zooKeeperSaslClient = new ZooKeeperSaslClient("zookeeper/" + addr.getHostName());
    } catch (LoginException e) {
        // An authentication error occurred when the SASL client tried to initialize:
        // for Kerberos this means that the client failed to authenticate with the KDC.
        // This is different from an authentication error that occurs during communication
        // with the Zookeeper server, which is handled below.
        LOG.warn("SASL configuration failed: " + e + " Will continue connection to Zookeeper server without "
                + "SASL authentication, if Zookeeper server allows it.");
        eventThread.queueEvent(new WatchedEvent(
                Watcher.Event.EventType.None,
                Watcher.Event.KeeperState.AuthFailed, null));
        saslLoginFailed = true;
    }
    logStartConnect(addr);

    clientCnxnSocket.connect(addr);
}
 

import org.apache.zookeeper.Watcher.Event; //导入依赖的package包/类
/**
 * Callback invoked by the ClientCnxnSocket once a connection has been
 * established.
 *
 * @param _negotiatedSessionTimeout
 * @param _sessionId
 * @param _sessionPasswd
 * @param isRO
 * @throws IOException
 */
void onConnected(int _negotiatedSessionTimeout, long _sessionId,
                 byte[] _sessionPasswd, boolean isRO) throws IOException {
    negotiatedSessionTimeout = _negotiatedSessionTimeout;
    if (negotiatedSessionTimeout <= 0) {
        state = States.CLOSED;

        eventThread.queueEvent(new WatchedEvent(
                Watcher.Event.EventType.None,
                Watcher.Event.KeeperState.Expired, null));
        eventThread.queueEventOfDeath();
        throw new SessionExpiredException(
                "Unable to reconnect to ZooKeeper service, session 0x"
                        + Long.toHexString(sessionId) + " has expired");
    }
    if (!readOnly && isRO) {
        LOG.error("Read/write client got connected to read-only server");
    }
    readTimeout = negotiatedSessionTimeout * 2 / 3;
    connectTimeout = negotiatedSessionTimeout / hostProvider.size();
    hostProvider.onConnected();
    sessionId = _sessionId;
    sessionPasswd = _sessionPasswd;
    state = (isRO) ?
            States.CONNECTEDREADONLY : States.CONNECTED;
    seenRwServerBefore |= !isRO;
    LOG.info("Session establishment complete on server "
            + clientCnxnSocket.getRemoteSocketAddress()
            + ", sessionid = 0x" + Long.toHexString(sessionId)
            + ", negotiated timeout = " + negotiatedSessionTimeout
            + (isRO ? " (READ-ONLY mode)" : ""));
    KeeperState eventState = (isRO) ?
            KeeperState.ConnectedReadOnly : KeeperState.SyncConnected;
    eventThread.queueEvent(new WatchedEvent(
            Watcher.Event.EventType.None,
            eventState, null));
}