1   /**
2    * Copyright 2011 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.monitoring;
21  
22  import static org.junit.Assert.*;
23  
24  import java.io.PrintWriter;
25  import java.io.StringWriter;
26  
27  import org.apache.hadoop.hbase.MediumTests;
28  import org.junit.Test;
29  import org.junit.experimental.categories.Category;
30  
31  /**
32   * Test case for the MemoryBoundedLogMessageBuffer utility.
33   * Ensures that it uses no more memory than it's supposed to,
34   * and that it properly deals with multibyte encodings.
35   */
36  @Category(MediumTests.class)
37  public class TestMemoryBoundedLogMessageBuffer {
38  
39    private static final long TEN_KB = 10 * 1024;
40    private static final String JP_TEXT = "こんにちは";
41    
42    @Test
43    public void testBuffer() {
44      MemoryBoundedLogMessageBuffer buf =
45        new MemoryBoundedLogMessageBuffer(TEN_KB);
46      
47      for (int i = 0; i < 1000; i++) {
48        buf.add("hello " + i);
49      }
50      assertTrue("Usage too big: " + buf.estimateHeapUsage(),
51          buf.estimateHeapUsage() < TEN_KB);
52      assertTrue("Too many retained: " + buf.getMessages().size(),
53          buf.getMessages().size() < 100);
54      StringWriter sw = new StringWriter();
55      buf.dumpTo(new PrintWriter(sw));
56      String dump = sw.toString();
57      assertFalse("The early log messages should be evicted",
58          dump.contains("hello 1\n"));
59      assertTrue("The late log messages should be retained",
60          dump.contains("hello 999\n"));
61    }
62    
63    @Test
64    public void testNonAsciiEncoding() {
65      MemoryBoundedLogMessageBuffer buf =
66        new MemoryBoundedLogMessageBuffer(TEN_KB);
67      
68      buf.add(JP_TEXT);
69      StringWriter sw = new StringWriter();
70      buf.dumpTo(new PrintWriter(sw));
71      String dump = sw.toString();
72      assertTrue(dump.contains(JP_TEXT));
73    }
74  
75    @org.junit.Rule
76    public org.apache.hadoop.hbase.ResourceCheckerJUnitRule cu =
77      new org.apache.hadoop.hbase.ResourceCheckerJUnitRule();
78  }
79