/*

  * 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.master.MasterGlobalCommHandler;

 import org.apache.giraph.io.InputType;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 /**

  * A request which workers will send to master to ask it to give them splits

  */

 public class AskForInputSplitRequest extends WritableRequest

     implements MasterRequest {

   /** Type of split we are requesting */

   private InputType splitType;

   /** Task id of worker which requested the split */

   private int workerTaskId;

   /**

    * Whether this is the first split a thread is requesting,

    * or this request indicates that previously requested input split was done

    */

   private boolean isFirstSplit;

   /**

    * Constructor

    *

    * @param splitType Type of split we are requesting

    * @param workerTaskId Task id of worker which requested the split

    * @param isFirstSplit Whether this is the first split a thread is requesting,

    *   or this request indicates that previously requested input split was done

    */

   public AskForInputSplitRequest(InputType splitType, int workerTaskId,

       boolean isFirstSplit) {

     this.splitType = splitType;

     this.workerTaskId = workerTaskId;

     this.isFirstSplit = isFirstSplit;

   }

   /**

    * Constructor used for reflection only

    */

   public AskForInputSplitRequest() {

   }

   @Override

   public void doRequest(MasterGlobalCommHandler commHandler) {

     commHandler.getInputSplitsHandler().sendSplitTo(

         splitType, workerTaskId, isFirstSplit);

   }

   @Override

   void readFieldsRequest(DataInput in) throws IOException {

     splitType = InputType.values()[in.readInt()];

     workerTaskId = in.readInt();

     isFirstSplit = in.readBoolean();

   }

   @Override

   void writeRequest(DataOutput out) throws IOException {

     out.writeInt(splitType.ordinal());

     out.writeInt(workerTaskId);

     out.writeBoolean(isFirstSplit);

   }

   @Override

   public RequestType getType() {

     return RequestType.ASK_FOR_INPUT_SPLIT_REQUEST;

   }

 }