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BlockWorkerValueAccessor 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   * Function for accessing WorkerValue.
22   *
23   * Intentionally hidden from APIs, to allow usage only
24   * within PieceWithWorkerContext.
25   */
26  public interface BlockWorkerValueAccessor {
27    /**
28     * Get global worker value.
29     * Value returned can be accessed from may threads, and so all
30     * accesses to it should be done in a thread-safe manner!
31     *
32     * This is the only place in Blocks Framework where you need
33     * to take care of concurrency.
34     */
35    Object getWorkerValue();
36  }