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DefaultMessageValueFactory 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.factories;
19  
20  import com.google.common.base.MoreObjects;
21  import org.apache.giraph.conf.ImmutableClassesGiraphConfiguration;
22  import org.apache.giraph.utils.WritableUtils;
23  import org.apache.hadoop.io.Writable;
24  
25  /**
26   * Factory class to create default message values.
27   *
28   * @param <M> Message Value
29   */
30  public class DefaultMessageValueFactory<M extends Writable>
31      implements MessageValueFactory<M> {
32    /** Message value class */
33    private final Class<M> messageValueClass;
34    /** Configuration */
35    private final ImmutableClassesGiraphConfiguration conf;
36  
37    /**
38     * Constructor
39     * @param messageValueClass message value class
40     * @param conf configuration
41     */
42    public DefaultMessageValueFactory(Class<M> messageValueClass,
43        ImmutableClassesGiraphConfiguration conf) {
44      this.messageValueClass = messageValueClass;
45      this.conf = conf;
46    }
47  
48    @Override public M newInstance() {
49      return WritableUtils.createWritable(messageValueClass, conf);
50    }
51  
52    @Override public String toString() {
53      return MoreObjects.toStringHelper(this)
54          .add("messageValueClass", messageValueClass)
55          .toString();
56    }
57  }