Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
NoMessage |
|
| 2.0;2 |
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.types; | |
19 | ||
20 | import java.io.DataInput; | |
21 | import java.io.DataOutput; | |
22 | import java.io.IOException; | |
23 | ||
24 | import org.apache.hadoop.io.Writable; | |
25 | ||
26 | /** | |
27 | * Type marking that in a particular superstep there will not be | |
28 | * sent messages. | |
29 | * We cannot use NullWritable for this, as you could send NullWritable, | |
30 | * to send a signal (whether a vertex receives a message or not) | |
31 | */ | |
32 | 0 | public class NoMessage implements Writable { |
33 | @Override | |
34 | public void readFields(DataInput in) throws IOException { | |
35 | 0 | throw new IllegalStateException("NoMessage should never be read"); |
36 | } | |
37 | ||
38 | @Override | |
39 | public void write(DataOutput out) throws IOException { | |
40 | 0 | throw new IllegalStateException("NoMessage should never be written"); |
41 | } | |
42 | } |