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...java/com/hazelcast/internal/eviction/impl/comparator/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. | ||
*/ | ||
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package com.hazelcast.internal.eviction.impl.comparator; | ||
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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; | ||
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import java.util.Collections; | ||
import java.util.LinkedList; | ||
import java.util.List; | ||
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import static org.junit.Assert.assertEquals; | ||
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@RunWith(HazelcastSerialClassRunner.class) | ||
@Category(QuickTest.class) | ||
public class LRUEvictionPolicyComparatorTest { | ||
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private static final long NOW = 20; | ||
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@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)); | ||
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// 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))); | ||
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// 2. Then sort given entries by using LRU eviction comparator. | ||
Collections.sort(givenEntries, (o1, o2) -> LRUEvictionPolicyComparator.INSTANCE.compare(o1, o2)); | ||
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// 3. Check both lists are equal | ||
assertEquals(descOrderByIdleTimes, givenEntries); | ||
} | ||
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private static long idleTime(TestEntryView entryView) { | ||
return NOW - Math.max(entryView.getCreationTime(), entryView.getLastAccessTime()); | ||
} | ||
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private static class TestEntryView implements EvictableEntryView { | ||
private long id; | ||
private long creationTime; | ||
private long lastAccessTime; | ||
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TestEntryView(long id, long creationTime, long lastAccessTime) { | ||
this.id = id; | ||
this.creationTime = creationTime; | ||
this.lastAccessTime = lastAccessTime; | ||
} | ||
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@Override | ||
public long getCreationTime() { | ||
return creationTime; | ||
} | ||
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@Override | ||
public long getLastAccessTime() { | ||
return lastAccessTime; | ||
} | ||
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public long getId() { | ||
return id; | ||
} | ||
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@Override | ||
public boolean equals(Object o) { | ||
if (this == o) { | ||
return true; | ||
} | ||
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if (o == null || getClass() != o.getClass()) { | ||
return false; | ||
} | ||
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TestEntryView that = (TestEntryView) o; | ||
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if (id != that.id) { | ||
return false; | ||
} | ||
if (creationTime != that.creationTime) { | ||
return false; | ||
} | ||
return lastAccessTime == that.lastAccessTime; | ||
} | ||
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@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; | ||
} | ||
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@Override | ||
public String toString() { | ||
return "TestEntryView{" | ||
+ "id=" + id | ||
+ ", now=" + NOW | ||
+ ", creationTime=" + creationTime | ||
+ ", lastAccessTime=" + lastAccessTime | ||
+ ", idleTime=" + idleTime(this) + '}'; | ||
} | ||
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@Override | ||
public Object getKey() { | ||
throw new UnsupportedOperationException(); | ||
} | ||
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@Override | ||
public Object getValue() { | ||
throw new UnsupportedOperationException(); | ||
} | ||
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@Override | ||
public long getHits() { | ||
throw new UnsupportedOperationException(); | ||
} | ||
} | ||
} |