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LRUEvictionPolicyComparatorTest.java
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LRUEvictionPolicyComparatorTest.java
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/*
* Copyright (c) 2008-2021, Hazelcast, Inc. All Rights Reserved.
*
* 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.hazelcast.internal.eviction.impl.comparator;
import com.hazelcast.spi.eviction.EvictableEntryView;
import com.hazelcast.test.HazelcastSerialClassRunner;
import com.hazelcast.test.annotation.QuickTest;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import static org.junit.Assert.assertEquals;
@RunWith(HazelcastSerialClassRunner.class)
@Category(QuickTest.class)
public class LRUEvictionPolicyComparatorTest {
private static final long NOW = 20;
@Test
public void lru_comparator_does_not_prematurely_select_newly_created_entries() {
// 0. Entries to sort
List<TestEntryView> givenEntries = new LinkedList<>();
givenEntries.add(new TestEntryView(1, 1, 0));
givenEntries.add(new TestEntryView(2, 2, 3));
givenEntries.add(new TestEntryView(3, 2, 0));
givenEntries.add(new TestEntryView(4, 4, 4));
givenEntries.add(new TestEntryView(5, 5, 20));
givenEntries.add(new TestEntryView(6, 6, 6));
givenEntries.add(new TestEntryView(7, 7, 0));
givenEntries.add(new TestEntryView(8, 9, 15));
givenEntries.add(new TestEntryView(9, 10, 10));
givenEntries.add(new TestEntryView(10, 10, 0));
// 1. Create expected list of ordered elements by
// sorting entries based on their idle-times. Longest
// idle time must be the first element of the list.
List<TestEntryView> descOrderByIdleTimes = new LinkedList<>(givenEntries);
Collections.sort(descOrderByIdleTimes, (o1, o2) -> -Long.compare(idleTime(o1), idleTime(o2)));
// 2. Then sort given entries by using LRU eviction comparator.
Collections.sort(givenEntries, (o1, o2) -> LRUEvictionPolicyComparator.INSTANCE.compare(o1, o2));
// 3. Check both lists are equal
assertEquals(descOrderByIdleTimes, givenEntries);
}
private static long idleTime(EvictableEntryView entryView) {
return NOW - Math.max(entryView.getCreationTime(), entryView.getLastAccessTime());
}
private static class TestEntryView implements EvictableEntryView {
private long id;
private long creationTime;
private long lastAccessTime;
TestEntryView(long id, long creationTime, long lastAccessTime) {
this.id = id;
this.creationTime = creationTime;
this.lastAccessTime = lastAccessTime;
}
@Override
public long getCreationTime() {
return creationTime;
}
@Override
public long getLastAccessTime() {
return lastAccessTime;
}
public long getId() {
return id;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
TestEntryView that = (TestEntryView) o;
if (id != that.id) {
return false;
}
if (creationTime != that.creationTime) {
return false;
}
return lastAccessTime == that.lastAccessTime;
}
@Override
public int hashCode() {
int result = (int) (id ^ (id >>> 32));
result = 31 * result + (int) (creationTime ^ (creationTime >>> 32));
result = 31 * result + (int) (lastAccessTime ^ (lastAccessTime >>> 32));
return result;
}
@Override
public String toString() {
return "TestEntryView{"
+ "id=" + id
+ ", now=" + NOW
+ ", creationTime=" + creationTime
+ ", lastAccessTime=" + lastAccessTime
+ ", idleTime=" + idleTime(this) + '}';
}
@Override
public Object getKey() {
throw new UnsupportedOperationException();
}
@Override
public Object getValue() {
throw new UnsupportedOperationException();
}
@Override
public long getHits() {
throw new UnsupportedOperationException();
}
}
}