Package net.rubyeye.xmemcached.impl

Source Code of net.rubyeye.xmemcached.impl.MemcachedHandler$CheckHeartResultThread

/**
*Copyright [2009-2010] [dennis zhuang(killme2008@gmail.com)]
*Licensed 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 net.rubyeye.xmemcached.impl;

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicInteger;

import net.rubyeye.xmemcached.MemcachedClient;
import net.rubyeye.xmemcached.MemcachedClientStateListener;
import net.rubyeye.xmemcached.auth.AuthMemcachedConnectListener;
import net.rubyeye.xmemcached.command.Command;
import net.rubyeye.xmemcached.command.CommandType;
import net.rubyeye.xmemcached.command.MapReturnValueAware;
import net.rubyeye.xmemcached.command.OperationStatus;
import net.rubyeye.xmemcached.command.binary.BinaryGetCommand;
import net.rubyeye.xmemcached.command.binary.BinaryVersionCommand;
import net.rubyeye.xmemcached.command.text.TextGetOneCommand;
import net.rubyeye.xmemcached.command.text.TextVersionCommand;
import net.rubyeye.xmemcached.monitor.StatisticsHandler;
import net.rubyeye.xmemcached.networking.MemcachedSession;
import net.rubyeye.xmemcached.networking.MemcachedSessionConnectListener;
import net.rubyeye.xmemcached.utils.InetSocketAddressWrapper;
import net.rubyeye.xmemcached.utils.Protocol;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.code.yanf4j.core.Session;
import com.google.code.yanf4j.core.impl.HandlerAdapter;
import com.google.code.yanf4j.util.SystemUtils;

/**
* Memcached Session Handler,used for dispatching commands and session's
* lifecycle management
*
* @author dennis
*
*/
public class MemcachedHandler extends HandlerAdapter {

  private final StatisticsHandler statisticsHandler;

  private ExecutorService heartBeatThreadPool;

  private final MemcachedSessionConnectListener listener;

  private final MemcachedClient client;
  private static final Logger log = LoggerFactory
      .getLogger(MemcachedHandler.class);

  /**
   * On receive message from memcached server
   */
  @Override
  public final void onMessageReceived(final Session session, final Object msg) {
    Command command = (Command) msg;
    if (this.statisticsHandler.isStatistics()) {
      if (command.getMergeCount() > 0) {
        int size = ((MapReturnValueAware) command).getReturnValues()
            .size();
        this.statisticsHandler.statistics(CommandType.GET_HIT, size);
        this.statisticsHandler.statistics(CommandType.GET_MISS, command
            .getMergeCount()
            - size);
      } else if (command instanceof TextGetOneCommand
          || command instanceof BinaryGetCommand) {
        if (command.getResult() != null) {
          this.statisticsHandler.statistics(CommandType.GET_HIT);
        } else {
          this.statisticsHandler.statistics(CommandType.GET_MISS);
        }
      } else {
        this.statisticsHandler.statistics(command.getCommandType());
      }
    }
  }

  private volatile boolean enableHeartBeat = true;

  public void setEnableHeartBeat(boolean enableHeartBeat) {
    this.enableHeartBeat = enableHeartBeat;
  }

  /**
   * put command which have been sent to queue
   */
  @Override
  public final void onMessageSent(Session session, Object msg) {
    Command command = (Command) msg;
    command.setStatus(OperationStatus.SENT);
    if (!command.isNoreply()
        || this.client.getProtocol() == Protocol.Binary) {
      ((MemcachedTCPSession) session).addCommand(command);
    }
  }

  @Override
  public void onExceptionCaught(Session session, Throwable throwable) {
    log.error("XMemcached network layout exception", throwable);
  }

  /**
   * On session started
   */
  @Override
  public void onSessionStarted(Session session) {
    session.setUseBlockingRead(true);
    session.setAttribute(HEART_BEAT_FAIL_COUNT_ATTR, new AtomicInteger(0));
    for (MemcachedClientStateListener listener : this.client
        .getStateListeners()) {
      listener.onConnected(this.client, session.getRemoteSocketAddress());
    }
    this.listener.onConnect((MemcachedTCPSession) session, this.client);
  }

  /**
   * Check if have to reconnect on session closed
   */
  @Override
  public final void onSessionClosed(Session session) {
    this.client.getConnector().removeSession(session);
    MemcachedTCPSession memcachedSession = (MemcachedTCPSession) session;
    // destroy memached session
    memcachedSession.destroy();
    if (this.client.getConnector().isStarted()
        && memcachedSession.isAllowReconnect()) {
      this.reconnect(memcachedSession);
    }
    for (MemcachedClientStateListener listener : this.client
        .getStateListeners()) {
      listener.onDisconnected(this.client, session
          .getRemoteSocketAddress());
    }
  }

  /**
   * Do a heartbeat action
   */
  @Override
  public void onSessionIdle(Session session) {
    if (this.enableHeartBeat) {
      log.debug("Session (%s) is idle,send heartbeat", session
          .getRemoteSocketAddress() == null ? "unknown" : SystemUtils
          .getRawAddress(session.getRemoteSocketAddress())
          + ":" + session.getRemoteSocketAddress().getPort());
      Command versionCommand = null;
      CountDownLatch latch = new CountDownLatch(1);
      if (this.client.getProtocol() == Protocol.Binary) {
        versionCommand = new BinaryVersionCommand(latch, session
            .getRemoteSocketAddress());

      } else {
        versionCommand = new TextVersionCommand(latch, session
            .getRemoteSocketAddress());
      }
      session.write(versionCommand);
      // Start a check thread,avoid blocking reactor thread
      if (this.heartBeatThreadPool != null) {
        this.heartBeatThreadPool.execute(new CheckHeartResultThread(
            versionCommand, session));
      }
    }

  }

  private static final String HEART_BEAT_FAIL_COUNT_ATTR = "heartBeatFailCount";
  private static final int MAX_HEART_BEAT_FAIL_COUNT = 5;

  final static class CheckHeartResultThread implements Runnable {

    private final Command versionCommand;
    private final Session session;

    public CheckHeartResultThread(Command versionCommand, Session session) {
      super();
      this.versionCommand = versionCommand;
      this.session = session;
    }

    public void run() {
      try {
        AtomicInteger heartBeatFailCount = (AtomicInteger) this.session
            .getAttribute(HEART_BEAT_FAIL_COUNT_ATTR);
        if (heartBeatFailCount != null) {
          if (!this.versionCommand.getLatch().await(2000,
              TimeUnit.MILLISECONDS)) {
            heartBeatFailCount.incrementAndGet();
          }
          if (this.versionCommand.getResult() == null) {
            heartBeatFailCount.incrementAndGet();
          } else {
            // reset
            heartBeatFailCount.set(0);
          }
          // 10 times fail
          if (heartBeatFailCount.get() > MAX_HEART_BEAT_FAIL_COUNT) {
            log
                .warn("Session("
                    + SystemUtils
                        .getRawAddress(this.session
                            .getRemoteSocketAddress())
                    + ":"
                    + this.session.getRemoteSocketAddress()
                        .getPort()
                    + ") heartbeat fail 10 times,close session and try to heal it");
            this.session.close();// close session
            heartBeatFailCount.set(0);
          }
        }
      } catch (InterruptedException e) {
        // ignore
      }
    }
  }

  /**
   * Auto reconect to memcached server
   *
   * @param session
   */
  protected void reconnect(MemcachedTCPSession session) {
    if (!this.client.isShutdown()) {
      // Prevent reconnecting repeatedly
      synchronized (session) {
        if (!session.isAllowReconnect()) {
          return;
        }
        session.setAllowReconnect(false);
      }
      MemcachedSession memcachedTCPSession = session;
      InetSocketAddressWrapper inetSocketAddressWrapper = memcachedTCPSession
          .getInetSocketAddressWrapper();
      this.client.getConnector().addToWatingQueue(
          new ReconnectRequest(inetSocketAddressWrapper, 0,
              this.client.getHealSessionInterval()));
    }
  }

  public void stop() {
    this.heartBeatThreadPool.shutdown();
  }

  public void start() {
    int serverSize = this.client.getAvaliableServers().size();
    this.heartBeatThreadPool = Executors
        .newFixedThreadPool(serverSize == 0 ? Runtime.getRuntime()
            .availableProcessors() : serverSize);
  }

  public MemcachedHandler(MemcachedClient client) {
    super();
    this.client = client;
    this.listener = new AuthMemcachedConnectListener();
    this.statisticsHandler = new StatisticsHandler();

  }

}
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