/*
    * 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();
      }
    }
  }