| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.hadoop.hbase.monitoring; |
| |
| import static org.junit.Assert.assertFalse; |
| import static org.junit.Assert.assertTrue; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| import org.apache.hadoop.hbase.HBaseClassTestRule; |
| import org.apache.hadoop.hbase.testclassification.MiscTests; |
| import org.apache.hadoop.hbase.testclassification.SmallTests; |
| import org.junit.ClassRule; |
| import org.junit.Test; |
| import org.junit.experimental.categories.Category; |
| |
| /** |
| * Test case for the MemoryBoundedLogMessageBuffer utility. |
| * Ensures that it uses no more memory than it's supposed to, |
| * and that it properly deals with multibyte encodings. |
| */ |
| @Category({MiscTests.class, SmallTests.class}) |
| public class TestMemoryBoundedLogMessageBuffer { |
| |
| @ClassRule |
| public static final HBaseClassTestRule CLASS_RULE = |
| HBaseClassTestRule.forClass(TestMemoryBoundedLogMessageBuffer.class); |
| |
| private static final long TEN_KB = 10 * 1024; |
| private static final String JP_TEXT = "こんにちは"; |
| |
| @Test |
| public void testBuffer() { |
| MemoryBoundedLogMessageBuffer buf = |
| new MemoryBoundedLogMessageBuffer(TEN_KB); |
| |
| for (int i = 0; i < 1000; i++) { |
| buf.add("hello " + i); |
| } |
| assertTrue("Usage too big: " + buf.estimateHeapUsage(), |
| buf.estimateHeapUsage() < TEN_KB); |
| assertTrue("Too many retained: " + buf.getMessages().size(), |
| buf.getMessages().size() < 100); |
| StringWriter sw = new StringWriter(); |
| buf.dumpTo(new PrintWriter(sw)); |
| String dump = sw.toString(); |
| String eol = System.getProperty("line.separator"); |
| assertFalse("The early log messages should be evicted", |
| dump.contains("hello 1" + eol)); |
| assertTrue("The late log messages should be retained", |
| dump.contains("hello 999" + eol)); |
| } |
| |
| @Test |
| public void testNonAsciiEncoding() { |
| MemoryBoundedLogMessageBuffer buf = |
| new MemoryBoundedLogMessageBuffer(TEN_KB); |
| |
| buf.add(JP_TEXT); |
| StringWriter sw = new StringWriter(); |
| buf.dumpTo(new PrintWriter(sw)); |
| String dump = sw.toString(); |
| assertTrue(dump.contains(JP_TEXT)); |
| } |
| |
| } |
| |