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WorkerGCPiece 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  package org.apache.giraph.block_app.library.gc;
19  
20  import org.apache.giraph.block_app.framework.api.BlockWorkerContextSendApi;
21  import org.apache.giraph.block_app.framework.piece.PieceWithWorkerContext;
22  import org.apache.giraph.types.NoMessage;
23  import org.apache.hadoop.io.Writable;
24  import org.apache.hadoop.io.WritableComparable;
25  
26  import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
27  
28  /**
29   * Dummy piece to hint System.gc()
30   */
31  public class WorkerGCPiece extends PieceWithWorkerContext<WritableComparable,
32      Writable, Writable, NoMessage, Object, NoMessage, Object>  {
33  
34    @Override
35    @SuppressFBWarnings(value = "DM_GC")
36    public void workerContextSend(
37        BlockWorkerContextSendApi<WritableComparable, NoMessage> workerContextApi,
38        Object executionStage,
39        Object workerValue) {
40      System.gc();
41    }
42  }