001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.monitoring;
019
020import static org.junit.jupiter.api.Assertions.assertFalse;
021import static org.junit.jupiter.api.Assertions.assertTrue;
022
023import java.io.PrintWriter;
024import java.io.StringWriter;
025import org.apache.hadoop.hbase.testclassification.MiscTests;
026import org.apache.hadoop.hbase.testclassification.SmallTests;
027import org.junit.jupiter.api.Tag;
028import org.junit.jupiter.api.Test;
029
030/**
031 * Test case for the MemoryBoundedLogMessageBuffer utility. Ensures that it uses no more memory than
032 * it's supposed to, and that it properly deals with multibyte encodings.
033 */
034@Tag(MiscTests.TAG)
035@Tag(SmallTests.TAG)
036public class TestMemoryBoundedLogMessageBuffer {
037
038  private static final long TEN_KB = 10 * 1024;
039  private static final String JP_TEXT = "こんにちは";
040
041  @Test
042  public void testBuffer() {
043    MemoryBoundedLogMessageBuffer buf = new MemoryBoundedLogMessageBuffer(TEN_KB);
044
045    for (int i = 0; i < 1000; i++) {
046      buf.add("hello " + i);
047    }
048    assertTrue(buf.estimateHeapUsage() < TEN_KB, "Usage too big: " + buf.estimateHeapUsage());
049    assertTrue(buf.getMessages().size() < 100, "Too many retained: " + buf.getMessages().size());
050    StringWriter sw = new StringWriter();
051    buf.dumpTo(new PrintWriter(sw));
052    String dump = sw.toString();
053    String eol = System.getProperty("line.separator");
054    assertFalse(dump.contains("hello 1" + eol), "The early log messages should be evicted");
055    assertTrue(dump.contains("hello 999" + eol), "The late log messages should be retained");
056  }
057
058  @Test
059  public void testNonAsciiEncoding() {
060    MemoryBoundedLogMessageBuffer buf = new MemoryBoundedLogMessageBuffer(TEN_KB);
061
062    buf.add(JP_TEXT);
063    StringWriter sw = new StringWriter();
064    buf.dumpTo(new PrintWriter(sw));
065    String dump = sw.toString();
066    assertTrue(dump.contains(JP_TEXT));
067  }
068
069}