/*
    * 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.giraph.comm.requests;
  
  import org.apache.giraph.comm.ServerData;
  import org.apache.giraph.io.InputType;
  
  import java.io.DataInput;
  import java.io.DataOutput;
  import java.io.IOException;
  
  /**
   * A request which master will send to workers to give them splits
   */
  public class ReplyWithInputSplitRequest extends WritableRequest
      implements WorkerRequest {
    /** Type of input split */
    private InputType splitType;
    /** Serialized input split */
    private byte[] serializedInputSplit;
  
    /**
     * Constructor
     *
     * @param splitType Type of input split
     * @param serializedInputSplit Serialized input split
     */
    public ReplyWithInputSplitRequest(InputType splitType,
        byte[] serializedInputSplit) {
      this.splitType = splitType;
      this.serializedInputSplit = serializedInputSplit;
    }
  
    /**
     * Constructor used for reflection only
     */
    public ReplyWithInputSplitRequest() {
    }
  
    @Override
    void readFieldsRequest(DataInput in) throws IOException {
      splitType = InputType.values()[in.readInt()];
      int size = in.readInt();
      serializedInputSplit = new byte[size];
      in.readFully(serializedInputSplit);
    }
  
    @Override
    void writeRequest(DataOutput out) throws IOException {
      out.writeInt(splitType.ordinal());
      out.writeInt(serializedInputSplit.length);
      out.write(serializedInputSplit);
    }
  
    @Override
    public void doRequest(ServerData serverData) {
      serverData.getServiceWorker().getInputSplitsHandler().receivedInputSplit(
          splitType, serializedInputSplit);
    }
  
    @Override
    public RequestType getType() {
      return RequestType.REPLY_WITH_INPUT_SPLIT_REQUEST;
    }
  }