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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.hadoop.hbase.util;
19  
20  import static org.junit.Assert.assertEquals;
21  import static org.junit.Assert.assertFalse;
22  import static org.junit.Assert.assertNull;
23  import static org.junit.Assert.assertTrue;
24  
25  import org.apache.hadoop.hbase.testclassification.SmallTests;
26  import org.junit.Test;
27  import org.junit.experimental.categories.Category;
28  
29  @Category(SmallTests.class)
30  public class TestBoundedArrayQueue {
31  
32    private int qMaxElements = 5;
33    private BoundedArrayQueue<Integer> queue = new BoundedArrayQueue<Integer>(qMaxElements);
34  
35    @Test
36    public void testBoundedArrayQueueOperations() throws Exception {
37      assertEquals(0, queue.size());
38      assertNull(queue.poll());
39      assertNull(queue.peek());
40      for(int i=0;i<qMaxElements;i++){
41        assertTrue(queue.offer(i));
42      }
43      assertEquals(qMaxElements, queue.size());
44      assertFalse(queue.offer(0));
45      assertEquals(0, queue.peek().intValue());
46      assertEquals(0, queue.peek().intValue());
47      for (int i = 0; i < qMaxElements; i++) {
48        assertEquals(i, queue.poll().intValue());
49      }
50      assertEquals(0, queue.size());
51      assertNull(queue.poll());
52      // Write after one cycle is over
53      assertTrue(queue.offer(100));
54      assertTrue(queue.offer(1000));
55      assertEquals(100, queue.peek().intValue());
56      assertEquals(100, queue.poll().intValue());
57      assertEquals(1000, queue.poll().intValue());
58    }
59  }