001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019
020package org.apache.reef.runtime.common.driver.evaluator.pojos;
021
022import org.apache.reef.annotations.audience.DriverSide;
023import org.apache.reef.annotations.audience.Private;
024import org.apache.reef.proto.ReefServiceProtos;
025
026/**
027 * DriverSide representation of EvaluatorStatusProto.
028 */
029@DriverSide
030@Private
031public final class EvaluatorStatusPOJO {
032
033  private final String evaluatorID;
034  private final byte[] evaluatorIdBytes;
035  private final State evaluatorState;
036  private final byte[] errorBytes;
037
038
039  public EvaluatorStatusPOJO(final ReefServiceProtos.EvaluatorStatusProto proto) {
040
041    evaluatorID = proto.getEvaluatorId();
042    evaluatorIdBytes = proto.getEvaluatorIdBytes().toByteArray();
043    evaluatorState = proto.hasState()? getStateFromProto(proto.getState()) : null;
044    errorBytes = proto.hasError() ? proto.getError().toByteArray() : null;
045
046  }
047
048  /**
049   * @return true, if an evaluator has thrown an exception and sent it to a driver
050   */
051  public boolean hasError() {
052    return null != errorBytes;
053  }
054
055  /**
056   * @return serialized exception thrown by an evaluator
057   */
058  public byte[] getError(){
059    return errorBytes;
060  }
061
062  /**
063   * @return current {@link org.apache.reef.runtime.common.driver.evaluator.pojos.State} of a task
064   */
065  public State getState(){
066    return evaluatorState;
067  }
068
069  private State getStateFromProto(final org.apache.reef.proto.ReefServiceProtos.State protoState) {
070
071    switch (protoState) {
072    case INIT:
073      return State.INIT;
074    case RUNNING:
075      return State.RUNNING;
076    case DONE:
077      return State.DONE;
078    case SUSPEND:
079      return State.SUSPEND;
080    case FAILED:
081      return State.FAILED;
082    case KILLED:
083      return State.KILLED;
084    default:
085      throw new IllegalStateException("Unknown state " + protoState + " in EvaluatorStatusProto");
086    }
087  }
088
089}