Source code

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 */
019package org.apache.reef.vortex.common;
020
021import org.apache.reef.annotations.Unstable;
022import org.apache.reef.annotations.audience.Private;
023import org.apache.reef.io.serialization.Codec;
024import org.apache.reef.vortex.api.VortexFunction;
025
026/**
027 * Request to execute a tasklet.
028 */
029@Unstable
030@Private
031public final class TaskletExecutionRequest<TInput, TOutput> implements VortexRequest {
032  private final int taskletId;
033  private final VortexFunction<TInput, TOutput> userFunction;
034  private final TInput input;
035
036  /**
037   * @return the type of this VortexRequest.
038   */
039  @Override
040  public RequestType getType() {
041    return RequestType.ExecuteTasklet;
042  }
043
044  /**
045   * Request from Vortex Master to Vortex Worker to execute a tasklet.
046   */
047  public TaskletExecutionRequest(final int taskletId,
048                                 final VortexFunction<TInput, TOutput> userFunction,
049                                 final TInput input) {
050    this.taskletId = taskletId;
051    this.userFunction = userFunction;
052    this.input = input;
053  }
054
055  /**
056   * Execute the function using the input.
057   * @return Output of the function in a serialized form.
058   */
059  public byte[] execute() throws Exception {
060    final TOutput output = userFunction.call(input);
061    final Codec<TOutput> codec = userFunction.getOutputCodec();
062    // TODO[REEF-1113]: Handle serialization failure separately in Vortex
063    return codec.encode(output);
064  }
065
066  /**
067   * @return the ID of the VortexTasklet associated with this VortexRequest.
068   */
069  public int getTaskletId() {
070    return taskletId;
071  }
072
073  /**
074   * Get function of the tasklet.
075   */
076  public VortexFunction getFunction() {
077    return userFunction;
078  }
079
080  /**
081   * Get input of the tasklet.
082   */
083  public TInput getInput() {
084    return input;
085  }
086}