/*
    * 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);
    }
  }