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CreateSourceVertexCallback 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.edge;
20  
21  import org.apache.giraph.conf.GiraphConfigurationSettable;
22  import org.apache.hadoop.io.Writable;
23  
24  /**
25   * Implementations of this interface can decide whether
26   * we should create a vertex when it is not present in vertex input
27   * but exists in edge input.
28   *
29   * @param <I> vertex id
30   */
31  public interface CreateSourceVertexCallback<I extends Writable>
32      extends GiraphConfigurationSettable {
33  
34    /**
35     * Should we create a vertex that doesn't exist in vertex input
36     * but only exists in edge input
37     * @param vertexId the id of vertex to be created
38     * @return true if we should create a vertex
39     */
40    boolean shouldCreateSourceVertex(I vertexId);
41  
42  }