/**
* 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.tez.dag.app;


import org.apache.hadoop.conf.Configuration;
import org.apache.tez.dag.api.TezConfiguration;
import org.apache.tez.dag.app.dag.event.TaskAttemptEventAttemptFailed;
import org.apache.tez.dag.app.dag.event.TaskAttemptEventType;
import org.apache.tez.dag.records.TaskAttemptTerminationCause;
import org.apache.tez.dag.records.TezTaskAttemptID;
import org.apache.tez.runtime.api.TaskFailureType;


/**
 * This class keeps track of tasks that have already been launched. It
 * determines if a task is alive and running or marks a task as dead if it does
 * not hear from it for a long time.
 * 
 */
@SuppressWarnings({"unchecked"})
public class TaskHeartbeatHandler extends HeartbeatHandlerBase<TezTaskAttemptID> {

  public TaskHeartbeatHandler(AppContext context, int expectedConcurrency) {
    super(context, expectedConcurrency, "TaskHeartbeatHandler");
  }

  @Override
  protected int getConfiguredTimeout(Configuration conf) {
    return conf.getInt(TezConfiguration.TASK_HEARTBEAT_TIMEOUT_MS, TezConfiguration.TASK_HEARTBEAT_TIMEOUT_MS_DEFAULT);
  }

  @Override
  protected int getConfiguredTimeoutCheckInterval(Configuration conf) {
    return conf.getInt(TezConfiguration.TASK_HEARTBEAT_TIMEOUT_CHECK_MS, TezConfiguration.TASK_HEARTBEAT_TIMEOUT_CHECK_MS_DEFAULT);
  }

  @Override
  protected boolean hasTimedOut(
      HeartbeatHandlerBase.ReportTime report,
      long currentTime) {
    return (timeOut > 0) && (currentTime > report.getLastPing() + timeOut);
  }

  @Override
  protected void handleTimeOut(TezTaskAttemptID attemptId) {
    eventHandler.handle(new TaskAttemptEventAttemptFailed(attemptId,
        TaskAttemptEventType.TA_TIMED_OUT, TaskFailureType.NON_FATAL, "AttemptID:" + attemptId.toString()
        + " Timed out after " + timeOut / 1000 + " secs", TaskAttemptTerminationCause.TASK_HEARTBEAT_ERROR));
  }
}