TaskUtils.java

// Copyright 2016 Twitter. All rights reserved.
//
// 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 com.twitter.heron.scheduler.mesos.framework;

/**
 * Utils class fot mesos task
 */

public final class TaskUtils {
  private TaskUtils() {
    super();
  }

  //TaskIdFormat: TASK_NAME:ATTEMPT
  public static final String TASK_ID_TEMPLATE = "%s:%d";

  // TaskNameFormat: container_${CONTAINER_INDEX}_${SYSTEM_CURRENT_TIME}
  public static final String TASK_NAME_TEMPLATE = "container_%d_%d";

  public static String getTaskNameForContainerIndex(int containerIndex) {
    return String.format(TASK_NAME_TEMPLATE, containerIndex, System.currentTimeMillis());
  }

  public static String getTaskId(String taskName, int attempt) {
    return String.format(TASK_ID_TEMPLATE, taskName, attempt);
  }

  public static boolean isValidTaskId(String taskId) {
    String[] info = taskId.split(":");
    return info.length == 2;
  }

  public static String getTaskNameForTaskId(String taskId) {
    return taskId.split(":")[0];
  }

  public static int getAttemptForTaskId(String taskId) {
    return Integer.parseInt(taskId.split(":")[1]);
  }

  public static int getContainerIndexForTaskId(String taskId) {
    String taskName = getTaskNameForTaskId(taskId);
    return Integer.parseInt(taskName.split("_")[1]);
  }
}