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 }