/*

  * 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.netty.handler;

 import org.apache.giraph.comm.flow_control.FlowControl;

 import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;

 import org.apache.giraph.comm.ServerData;

 import org.apache.giraph.comm.requests.WorkerRequest;

 import org.apache.giraph.graph.TaskInfo;

 import org.apache.hadoop.io.Writable;

 import org.apache.hadoop.io.WritableComparable;

 /**

  * Handler for requests on worker

  *

  * @param <I> Vertex id

  * @param <V> Vertex data

  * @param <E> Edge data

  * @param <M> Message data

  */

 public class WorkerRequestServerHandler<I extends WritableComparable,

     V extends Writable, E extends Writable, M extends Writable> extends

     RequestServerHandler<WorkerRequest<I, V, E>> {

   /** Data that can be accessed for handling requests */

   private final ServerData<I, V, E> serverData;

   /**

    * Constructor with external server data

    *

    * @param serverData               Data held by the server

    * @param workerRequestReservedMap Worker request reservation map

    * @param conf                     Configuration

    * @param myTaskInfo               Current task info

    * @param exceptionHandler         Handles uncaught exceptions

    * @param flowControl              Reference to the flow control used

    */

   public WorkerRequestServerHandler(ServerData<I, V, E> serverData,

       WorkerRequestReservedMap workerRequestReservedMap,

       ImmutableClassesGiraphConfiguration conf,

       TaskInfo myTaskInfo,

       Thread.UncaughtExceptionHandler exceptionHandler,

       FlowControl flowControl) {

     super(workerRequestReservedMap, conf, myTaskInfo, exceptionHandler);

     this.serverData = serverData;

     this.flowControl = flowControl;

   }

   @Override

   public void processRequest(WorkerRequest<I, V, E> request) {

     request.doRequest(serverData);

   }

   /** Factory for {@link WorkerRequestServerHandler} */

   public static class Factory<I extends WritableComparable,

       V extends Writable, E extends Writable> implements

       RequestServerHandler.Factory {

     /** Data that can be accessed for handling requests */

     private final ServerData<I, V, E> serverData;

     /** Flow control used in sending requests */

     private FlowControl flowControl;

     /**

      * Constructor

      *

      * @param serverData Data held by the server

      */

     public Factory(ServerData<I, V, E> serverData) {

       this.serverData = serverData;

     }

     @Override

     public RequestServerHandler newHandler(

         WorkerRequestReservedMap workerRequestReservedMap,

         ImmutableClassesGiraphConfiguration conf,

         TaskInfo myTaskInfo,

         Thread.UncaughtExceptionHandler exceptionHandler) {

       return new WorkerRequestServerHandler<I, V, E, Writable>(serverData,

           workerRequestReservedMap, conf, myTaskInfo, exceptionHandler,

           flowControl);

     }

     @Override

     public void setFlowControl(FlowControl flowControl) {

       this.flowControl = flowControl;

     }

   }

 }