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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  
19  package org.apache.giraph.comm.flow_control;
20  
21  import org.apache.giraph.comm.netty.NettyClient;
22  import org.apache.giraph.comm.netty.handler.AckSignalFlag;
23  import org.apache.giraph.comm.requests.WritableRequest;
24  
25  /**
26   * Representation of a flow control policy that does not do anything other than
27   * the vanilla network client request transfer mechanism
28   */
29  public class NoOpFlowControl implements FlowControl {
30    /** Netty client */
31    private final NettyClient nettyClient;
32  
33    /**
34     * Constructor
35     *
36     * @param nettyClient netty client
37     */
38    public NoOpFlowControl(NettyClient nettyClient) {
39      this.nettyClient = nettyClient;
40    }
41  
42    @Override
43    public void sendRequest(int destTaskId, WritableRequest request) {
44      nettyClient.doSend(destTaskId, request);
45    }
46  
47    @Override
48    public void messageAckReceived(int taskId, long requestId, int response) { }
49  
50    @Override
51    public AckSignalFlag getAckSignalFlag(int response) {
52      return AckSignalFlag.values()[response];
53    }
54  
55    @Override
56    public void waitAllRequests() { }
57  
58    @Override
59    public int getNumberOfUnsentRequests() {
60      return 0;
61    }
62  
63    @Override
64    public int calculateResponse(AckSignalFlag alreadyDone, int taskId) {
65      return alreadyDone.ordinal();
66    }
67  
68    @Override
69    public void shutdown() { }
70  
71    @Override
72    public void logInfo() { }
73  }