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StoreIncomingMessageIOCommand xref
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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.ooc.command;
20  
21  import org.apache.giraph.ooc.OutOfCoreEngine;
22  import org.apache.giraph.ooc.data.DiskBackedMessageStore;
23  
24  import java.io.IOException;
25  
26  import static com.google.common.base.Preconditions.checkState;
27  
28  /**
29   * IOCommand to store incoming message of a particular partition.
30   */
31  public class StoreIncomingMessageIOCommand extends IOCommand {
32    /**
33     * Constructor
34     *
35     * @param oocEngine out-of-core engine
36     * @param partitionId id of the partition to store its incoming messages
37     */
38    public StoreIncomingMessageIOCommand(OutOfCoreEngine oocEngine,
39                                         int partitionId) {
40      super(oocEngine, partitionId);
41    }
42  
43    @Override
44    public boolean execute() throws IOException {
45      boolean executed = false;
46      if (oocEngine.getMetaPartitionManager()
47          .startOffloadingMessages(partitionId)) {
48        DiskBackedMessageStore messageStore =
49            (DiskBackedMessageStore)
50                oocEngine.getServerData().getIncomingMessageStore();
51        checkState(messageStore != null);
52        numBytesTransferred +=
53            messageStore.offloadPartitionData(partitionId);
54        oocEngine.getMetaPartitionManager().doneOffloadingMessages(partitionId);
55        executed = true;
56      }
57      return executed;
58    }
59  
60    @Override
61    public IOCommandType getType() {
62      return IOCommandType.STORE_MESSAGE;
63    }
64  
65    @Override
66    public String toString() {
67      return "StoreIncomingMessageIOCommand: (partitionId = " + partitionId + ")";
68    }
69  }