/*
    * 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.flow_control;
  
  import org.apache.giraph.comm.netty.NettyClient;
  import org.apache.giraph.comm.netty.handler.AckSignalFlag;
  import org.apache.giraph.comm.requests.WritableRequest;
  
  /**
   * Representation of a flow control policy that does not do anything other than
   * the vanilla network client request transfer mechanism
   */
  public class NoOpFlowControl implements FlowControl {
    /** Netty client */
    private final NettyClient nettyClient;
  
    /**
     * Constructor
     *
     * @param nettyClient netty client
     */
    public NoOpFlowControl(NettyClient nettyClient) {
      this.nettyClient = nettyClient;
    }
  
    @Override
    public void sendRequest(int destTaskId, WritableRequest request) {
      nettyClient.doSend(destTaskId, request);
    }
  
    @Override
    public void messageAckReceived(int taskId, long requestId, int response) { }
  
    @Override
    public AckSignalFlag getAckSignalFlag(int response) {
      return AckSignalFlag.values()[response];
    }
  
    @Override
    public void waitAllRequests() { }
  
    @Override
    public int getNumberOfUnsentRequests() {
      return 0;
    }
  
    @Override
    public int calculateResponse(AckSignalFlag alreadyDone, int taskId) {
      return alreadyDone.ordinal();
    }
  
    @Override
    public void logInfo() { }
  }