hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/protocolrecords/GetContainerStatusesResponse.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.yarn.api.protocolrecords;

import java.util.List;
import java.util.Map;

import org.apache.hadoop.classification.InterfaceAudience.Private;
import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.classification.InterfaceStability.Stable;
import org.apache.hadoop.classification.InterfaceStability.Unstable;
import org.apache.hadoop.yarn.api.ContainerManagementProtocol;
import org.apache.hadoop.yarn.api.records.ContainerId;
import org.apache.hadoop.yarn.api.records.ContainerStatus;
import org.apache.hadoop.yarn.api.records.SerializedException;
import org.apache.hadoop.yarn.util.Records;

/**
 * The response sent by the <code>NodeManager</code> to the
 * <code>ApplicationMaster</code> when asked to obtain the
 * <code>ContainerStatus</code> of requested containers.
 * 
 * @see ContainerManagementProtocol#getContainerStatuses(GetContainerStatusesRequest)
 */
@Public
@Stable
public abstract class GetContainerStatusesResponse {

  @Private
  @Unstable
  public static GetContainerStatusesResponse newInstance(
      List<ContainerStatus> statuses,
      Map<ContainerId, SerializedException> failedRequests) {
    GetContainerStatusesResponse response =
        Records.newRecord(GetContainerStatusesResponse.class);
    response.setContainerStatuses(statuses);
    response.setFailedRequests(failedRequests);
    return response;
  }

  /**
   * Get the <code>ContainerStatus</code>es of the requested containers.
   * 
   * @return <code>ContainerStatus</code>es of the requested containers.
   */
  @Public
  @Stable
  public abstract List<ContainerStatus> getContainerStatuses();

  /**
   * Set the <code>ContainerStatus</code>es of the requested containers.
   */
  @Private
  @Unstable
  public abstract void setContainerStatuses(List<ContainerStatus> statuses);

  /**
   * Get the containerId-to-exception map in which the exception indicates error
   * from per container for failed requests
   * @return map of containerId-to-exception
   */
  @Public
  @Stable
  public abstract Map<ContainerId, SerializedException> getFailedRequests();

  /**
   * Set the containerId-to-exception map in which the exception indicates error
   * from per container for failed requests
   */
  @Private
  @Unstable
  public abstract void setFailedRequests(
      Map<ContainerId, SerializedException> failedContainers);
}