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BlockApi 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.block_app.framework.api;
19  
20  /**
21   * Basic block computation API for accessing items
22   * present on both workers and master.
23   */
24  public interface BlockApi extends BlockConfApi {
25   /**
26     * Get number of workers
27     *
28     * @return Number of workers
29     */
30    int getWorkerCount();
31  
32    /**
33     * Get the total (all workers) number of vertices that
34     * existed at the start of the current piece.
35     *
36     * Recommended to avoid it, as it introduces global dependencies,
37     * code will not be able to work on top of a subgraphs any more.
38     * This number should be easily computable via reducer or aggregator.
39     */
40    @Deprecated
41    long getTotalNumVertices();
42  
43    /**
44     * Get the total (all workers) number of edges that
45     * existed at the start of the current piece.
46     *
47     * Recommended to avoid it, as it introduces global dependencies,
48     * code will not be able to work on top of a subgraphs any more.
49     * This number should be easily computable via reducer or aggregator.
50     */
51    @Deprecated
52    long getTotalNumEdges();
53  }