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GiraphJobObserver 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.job;
20  
21  import org.apache.hadoop.mapreduce.Job;
22  
23  /**
24   * An observer over the job launch lifecycle.
25   */
26  public interface GiraphJobObserver {
27    /**
28     * Callback for job about to start.
29     * @param jobToSubmit Job we're going to submit to hadoop.
30     */
31    void launchingJob(Job jobToSubmit);
32  
33    /**
34     * Callback after job was submitted.
35     * For example, you can track its progress here.
36     * @param submittedJob Job which was submitted.
37     */
38    void jobRunning(Job submittedJob);
39  
40    /**
41     * Callback when job finishes.
42     * @param submittedJob Job that ran in hadoop.
43     * @param passed true if job succeeded.
44     */
45    void jobFinished(Job submittedJob, boolean passed);
46  
47    /**
48     * Called when job gets all mappers and
49     * really starts computations.
50     * May not get called if the job progress tracker
51     * fails.
52     * @param job job that runs
53     */
54    void jobGotAllMappers(Job job);
55  }