/*

  * 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.hadoop.io.Text;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 import java.io.DataInput;

 import java.io.DataOutput;

 import java.io.IOException;

 /** Request which sends any Writable message from one worker to another */

 public class SendWorkerToWorkerMessageRequest extends WritableRequest

     implements WorkerRequest<WritableComparable, Writable, Writable> {

   /** Message sent */

   private Writable message;

   /**

    * Default constructor, for reflection

    */

   public SendWorkerToWorkerMessageRequest() {

   }

   /**

    * Constructor with message

    *

    * @param message Message sent

    */

   public SendWorkerToWorkerMessageRequest(Writable message) {

     this.message = message;

   }

   @Override

   public RequestType getType() {

     return RequestType.SEND_WORKER_TO_WORKER_MESSAGE_REQUEST;

   }

   @Override

   void writeRequest(DataOutput output) throws IOException {

     Text.writeString(output, message.getClass().getName());

     message.write(output);

   }

   @Override

   void readFieldsRequest(DataInput input) throws IOException {

     String className = Text.readString(input);

     try {

       message = (Writable) Class.forName(className).newInstance();

       message.readFields(input);

     } catch (InstantiationException | IllegalAccessException |

         ClassNotFoundException e) {

       throw new IllegalStateException(

           "readFieldsRequest: Exception occurred", e);

     }

   }

   @Override

   public void doRequest(

       ServerData<WritableComparable, Writable, Writable> serverData) {

     serverData.addIncomingWorkerToWorkerMessage(message);

   }

 }