/*

  * 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.block_app.framework.internal;

 import org.apache.giraph.block_app.framework.api.BlockWorkerReceiveApi;

 import org.apache.giraph.block_app.framework.api.BlockWorkerSendApi;

 import org.apache.giraph.block_app.framework.piece.AbstractPiece.InnerVertexSender;

 import org.apache.giraph.block_app.framework.piece.interfaces.VertexPostprocessor;

 import org.apache.giraph.block_app.framework.piece.interfaces.VertexReceiver;

 import org.apache.giraph.graph.Vertex;

 /**

  * Block execution logic on workers.

  */

 @SuppressWarnings({ "rawtypes", "unchecked" })

 public class BlockWorkerLogic {

   private final BlockWorkerPieces pieces;

   private transient VertexReceiver receiveFunctions;

   private transient InnerVertexSender sendFunctions;

   public BlockWorkerLogic(BlockWorkerPieces pieces) {

     this.pieces = pieces;

   }

   public void preSuperstep(

       BlockWorkerReceiveApi receiveApi, BlockWorkerSendApi sendApi) {

     pieces.getBlockApiHandle().setWorkerReceiveApi(receiveApi);

     pieces.getBlockApiHandle().setWorkerSendApi(sendApi);

     if (pieces.getReceiver() != null) {

       receiveFunctions = pieces.getReceiver().getVertexReceiver(receiveApi);

     }

     if (pieces.getSender() != null) {

       sendFunctions = pieces.getSender().getVertexSender(sendApi);

     }

   }

   public void compute(Vertex vertex, Iterable messages) {

     if (receiveFunctions != null) {

       receiveFunctions.vertexReceive(vertex, messages);

     }

     if (sendFunctions != null) {

       sendFunctions.vertexSend(vertex);

     }

   }

   public void postSuperstep() {

     if (receiveFunctions instanceof VertexPostprocessor) {

       ((VertexPostprocessor) receiveFunctions).postprocess();

     }

     if (sendFunctions != null) {

       sendFunctions.postprocess();

     }

   }

 }