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.metrics.impl;
019
020import static org.junit.Assert.assertEquals;
021import static org.junit.Assert.assertNotNull;
022import static org.junit.Assert.assertNull;
023import static org.junit.Assert.assertTrue;
024
025import java.util.Collection;
026import java.util.Set;
027import org.apache.hadoop.hbase.HBaseClassTestRule;
028import org.apache.hadoop.hbase.testclassification.SmallTests;
029import org.junit.Before;
030import org.junit.ClassRule;
031import org.junit.Test;
032import org.junit.experimental.categories.Category;
033
034import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
035
036@Category(SmallTests.class)
037public class TestRefCountingMap {
038
039  @ClassRule
040  public static final HBaseClassTestRule CLASS_RULE =
041    HBaseClassTestRule.forClass(TestRefCountingMap.class);
042
043  private RefCountingMap<String, String> map;
044
045  @Before
046  public void setUp() {
047    map = new RefCountingMap<>();
048  }
049
050  @Test
051  public void testPutGet() {
052    map.put("foo", () -> "foovalue");
053
054    String v = map.get("foo");
055    assertNotNull(v);
056    assertEquals("foovalue", v);
057  }
058
059  @Test
060  public void testPutMulti() {
061    String v1 = map.put("foo", () -> "foovalue");
062    String v2 = map.put("foo", () -> "foovalue2");
063    String v3 = map.put("foo", () -> "foovalue3");
064
065    String v = map.get("foo");
066    assertEquals("foovalue", v);
067    assertEquals(v, v1);
068    assertEquals(v, v2);
069    assertEquals(v, v3);
070  }
071
072  @Test
073  public void testPutRemove() {
074    map.put("foo", () -> "foovalue");
075    String v = map.remove("foo");
076    assertNull(v);
077    v = map.get("foo");
078    assertNull(v);
079  }
080
081  @Test
082  public void testPutRemoveMulti() {
083    map.put("foo", () -> "foovalue");
084    map.put("foo", () -> "foovalue2");
085    map.put("foo", () -> "foovalue3");
086
087    // remove 1
088    String v = map.remove("foo");
089    assertEquals("foovalue", v);
090
091    // remove 2
092    v = map.remove("foo");
093    assertEquals("foovalue", v);
094
095    // remove 3
096    v = map.remove("foo");
097    assertNull(v);
098    v = map.get("foo");
099    assertNull(v);
100  }
101
102  @Test
103  public void testSize() {
104    assertEquals(0, map.size());
105
106    // put a key
107    map.put("foo", () -> "foovalue");
108    assertEquals(1, map.size());
109
110    // put a different key
111    map.put("bar", () -> "foovalue2");
112    assertEquals(2, map.size());
113
114    // put the same key again
115    map.put("bar", () -> "foovalue3");
116    assertEquals(2, map.size()); // map should be same size
117  }
118
119  @Test
120  public void testClear() {
121    map.put("foo", () -> "foovalue");
122    map.put("bar", () -> "foovalue2");
123    map.put("baz", () -> "foovalue3");
124
125    map.clear();
126
127    assertEquals(0, map.size());
128  }
129
130  @Test
131  public void testKeySet() {
132    map.put("foo", () -> "foovalue");
133    map.put("bar", () -> "foovalue2");
134    map.put("baz", () -> "foovalue3");
135
136    Set<String> keys = map.keySet();
137    assertEquals(3, keys.size());
138
139    Lists.newArrayList("foo", "bar", "baz").stream().forEach(v -> assertTrue(keys.contains(v)));
140  }
141
142  @Test
143  public void testValues() {
144    map.put("foo", () -> "foovalue");
145    map.put("foo", () -> "foovalue2");
146    map.put("bar", () -> "foovalue3");
147    map.put("baz", () -> "foovalue4");
148
149    Collection<String> values = map.values();
150    assertEquals(3, values.size());
151
152    Lists.newArrayList("foovalue", "foovalue3", "foovalue4").stream()
153      .forEach(v -> assertTrue(values.contains(v)));
154  }
155}