core/src/main/java/org/apache/hadoop/chukwa/datacollection/writer/ClientAck.java

/*
 * 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.hadoop.chukwa.datacollection.writer;


import org.apache.log4j.Logger;

public class ClientAck {
  static Logger log = Logger.getLogger(ClientAck.class);

  // TODO move all constant to config

  public static final int OK = 100;
  public static final int KO = -100;
  public static final int KO_LOCK = -200;

  private long ts = 0;

  private Object lock = new Object();
  private int status = 0;
  private Throwable exception = null;
  private int waitTime = 6 * 1000;// 6 secs
  private int timeOut = 15 * 1000;

  public ClientAck() {
    this.ts = System.currentTimeMillis() + timeOut;
  }

  public int getTimeOut() {
    return timeOut;
  }

  public void wait4Ack() {
    synchronized (lock) {
      // log.info(">>>>>>>>>>>>>>>>>>>>>>>>> Client synch");
      while (this.status == 0) {
        // log.info(">>>>>>>>>>>>>>>>>>>>>>>>> Client Before wait");
        try {
          lock.wait(waitTime);
        } catch (InterruptedException e) {
        }
        long now = System.currentTimeMillis();
        if (now > ts) {
          this.status = KO_LOCK;
          this.exception = new RuntimeException("More than maximum time lock ["
              + this.toString() + "]");
        }
      }
      // log.info("[" + Thread.currentThread().getName() +
      // "] >>>>>>>>>>>>>>>>> Client after wait status [" + status + "] [" +
      // this.toString() + "]");
    }
  }

  public void releaseLock(int status, Throwable exception) {
    this.exception = exception;
    this.status = status;

    // log.info("[" + Thread.currentThread().getName() +
    // "] <<<<<<<<<<<<<<<<< Server synch [" + status + "] ----->>>> [" +
    // this.toString() + "]");
    synchronized (lock) {
      // log.info("<<<<<<<<<<<<<<< Server before notify");
      lock.notifyAll();
    }
    // log.info("<<<<<<<<<<<<<<< Server after notify");
  }

  public int getStatus() {
    return status;
  }

  public void setStatus(int status) {
    this.status = status;
  }

  public Throwable getException() {
    return exception;
  }

  public void setException(Throwable exception) {
    this.exception = exception;
  }
}