| /** |
| * 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.hdfs.server.namenode; |
| |
| import static org.junit.Assert.*; |
| |
| import org.junit.Test; |
| |
| /** |
| * Test for {@link NameCache} class |
| */ |
| public class TestNameCache { |
| @Test |
| public void testDictionary() throws Exception { |
| // Create dictionary with useThreshold 2 |
| NameCache<String> cache = |
| new NameCache<String>(2); |
| String[] matching = {"part1", "part10000000", "fileabc", "abc", "filepart"}; |
| String[] notMatching = {"spart1", "apart", "abcd", "def"}; |
| |
| for (String s : matching) { |
| // Add useThreshold times so the names are promoted to dictionary |
| cache.put(s); |
| assertTrue(s == cache.put(s)); |
| } |
| for (String s : notMatching) { |
| // Add < useThreshold times so the names are not promoted to dictionary |
| cache.put(s); |
| } |
| |
| // Mark dictionary as initialized |
| cache.initialized(); |
| |
| for (String s : matching) { |
| verifyNameReuse(cache, s, true); |
| } |
| // Check dictionary size |
| assertEquals(matching.length, cache.size()); |
| |
| for (String s : notMatching) { |
| verifyNameReuse(cache, s, false); |
| } |
| } |
| |
| private void verifyNameReuse(NameCache<String> cache, String s, boolean reused) { |
| cache.put(s); |
| int lookupCount = cache.getLookupCount(); |
| if (reused) { |
| // Dictionary returns non null internal value |
| assertNotNull(cache.put(s)); |
| // Successful lookup increments lookup count |
| assertEquals(lookupCount + 1, cache.getLookupCount()); |
| } else { |
| // Dictionary returns null - since name is not in the dictionary |
| assertNull(cache.put(s)); |
| // Lookup count remains the same |
| assertEquals(lookupCount, cache.getLookupCount()); |
| } |
| } |
| } |