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/*
* Copyright 2000-2014 JetBrains s.r.o.
*
* Licensed 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 com.intellij.util.containers;
import com.intellij.openapi.util.text.StringUtil;
import gnu.trove.TObjectHashingStrategy;
import org.junit.Test;
import java.lang.ref.SoftReference;
import java.util.List;
import java.util.Map;
import java.util.Set;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class ConcurrentMapsTest {
private static final TObjectHashingStrategy<String> CUSTOM_STRATEGY = new TObjectHashingStrategy<String>() {
@Override
public int computeHashCode(String object) {
return Character.toLowerCase(object.charAt(object.length() - 1));
}
@Override
public boolean equals(String o1, String o2) {
return StringUtil.equalsIgnoreCase(o1, o2);
}
};
@Test
public void testKeysRemovedWhenIdentityStrategyIsUsed() {
@SuppressWarnings("unchecked") ConcurrentWeakHashMap<Object, Object> map = new ConcurrentWeakHashMap<Object, Object>(TObjectHashingStrategy.IDENTITY);
map.put(new Object(), new Object());
tryGcSoftlyReachableObjects(); // sometimes weak references are not collected under linux, try to stress gc to force them
do {
System.gc();
}
while (!map.processQueue());
map.put(this, this);
assertEquals(1, map.underlyingMapSize());
}
@Test
public void testRemoveFromSoftEntrySet() {
ConcurrentSoftHashMap<Object, Object> map = new ConcurrentSoftHashMap<Object, Object>();
map.put(this, this);
Set<Map.Entry<Object,Object>> entries = map.entrySet();
assertEquals(1, entries.size());
Map.Entry<Object, Object> entry = entries.iterator().next();
entries.remove(entry);
assertTrue(map.isEmpty());
}
@Test
public void testRemoveFromWeakEntrySet() {
ConcurrentWeakHashMap<Object, Object> map = new ConcurrentWeakHashMap<Object, Object>();
map.put(this, this);
Set<Map.Entry<Object,Object>> entries = map.entrySet();
assertEquals(1, entries.size());
Map.Entry<Object, Object> entry = entries.iterator().next();
entries.remove(entry);
assertTrue(map.isEmpty());
}
@Test
public void testTossedWeakKeysAreRemoved() {
ConcurrentWeakHashMap<Object, Object> map = new ConcurrentWeakHashMap<Object, Object>();
map.put(new Object(), new Object());
tryGcSoftlyReachableObjects(); // sometimes weak references are not collected under linux, try to stress gc to force them
do {
System.gc();
}
while (!map.processQueue());
assertEquals(0, map.underlyingMapSize());
map.put(this, this);
assertEquals(1, map.underlyingMapSize());
}
public static void tryGcSoftlyReachableObjects() {
SoftReference<?> reference = new SoftReference<Object>(new Object());
List<Object> list = ContainerUtil.newArrayList();
while (reference.get() != null) {
int chunk = (int)Math.min(Runtime.getRuntime().freeMemory() / 2, Integer.MAX_VALUE);
list.add(new SoftReference<byte[]>(new byte[chunk]));
}
}
@Test
public void testTossedSoftKeysAreRemoved() {
ConcurrentSoftHashMap<Object, Object> map = new ConcurrentSoftHashMap<Object, Object>();
map.put(new Object(), new Object());
tryGcSoftlyReachableObjects();
do {
System.gc();
}
while (!map.processQueue());
assertEquals(0, map.underlyingMapSize());
map.put(this, this);
assertEquals(1, map.underlyingMapSize());
}
@Test
public void testTossedWeakValueIsRemoved() {
ConcurrentWeakValueHashMap<Object, Object> map = new ConcurrentWeakValueHashMap<Object, Object>();
map.put(new Object(), new Object());
tryGcSoftlyReachableObjects(); // sometimes weak references are not collected under linux, try to stress gc to force them
do {
System.gc();
}
while (!map.processQueue());
assertEquals(0, map.underlyingMapSize());
map.put(this, this);
assertEquals(1, map.underlyingMapSize());
}
@Test
public void testTossedSoftValueIsRemoved() {
ConcurrentSoftValueHashMap<Object, Object> map = new ConcurrentSoftValueHashMap<Object, Object>();
map.put(new Object(), new Object());
tryGcSoftlyReachableObjects();
do {
System.gc();
}
while (!map.processQueue());
assertEquals(0, map.underlyingMapSize());
map.put(this, this);
assertEquals(1, map.underlyingMapSize());
}
@Test
public void testCustomStrategy() {
SoftHashMap<String, String> map = new SoftHashMap<String, String>(CUSTOM_STRATEGY);
map.put("ab", "ab");
assertTrue(map.containsKey("AB"));
String removed = map.remove("aB");
assertEquals("ab", removed);
assertTrue(map.isEmpty());
}
@Test
public void testCustomStrategyForConcurrentSoft() {
ConcurrentSoftHashMap<String, String> map = new ConcurrentSoftHashMap<String, String>(CUSTOM_STRATEGY);
map.put("ab", "ab");
assertEquals(1, map.size());
assertTrue(map.containsKey("AB"));
String removed = map.remove("aB");
assertEquals("ab", removed);
assertTrue(map.isEmpty());
}
@Test
public void testCustomStrategyForConcurrentWeakSoft() {
ConcurrentWeakKeySoftValueHashMap<String, String> map = new ConcurrentWeakKeySoftValueHashMap<String, String>(1,1,1,CUSTOM_STRATEGY);
map.put("ab", "ab");
assertEquals(1, map.size());
assertTrue(map.containsKey("AB"));
String removed = map.remove("aB");
assertEquals("ab", removed);
assertTrue(map.isEmpty());
}
@Test
public void testTossedSoftKeyAndValue() {
SoftKeySoftValueHashMap<Object, Object> map = new SoftKeySoftValueHashMap<Object, Object>();
map.put(new Object(), new Object());
tryGcSoftlyReachableObjects();
do {
System.gc();
}
while (!map.processQueue());
assertTrue(map.isEmpty());
}
@Test
public void testTossedWeakKeyAndValue() {
WeakKeyWeakValueHashMap<Object, Object> map = new WeakKeyWeakValueHashMap<Object, Object>();
map.put(new Object(), new Object());
tryGcSoftlyReachableObjects();
do {
System.gc();
}
while (!map.processQueue());
assertTrue(map.isEmpty());
}
}
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