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Java example source code file (AbstractCacheTest.java)

This example Java source code file (AbstractCacheTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstractcache, abstractcachetest, atomicreference, cache, cachestats, integer, list, object, override, simplestatscounter, testcase, unsupportedoperationexception, util

The AbstractCacheTest.java Java example source code

/*
 * Copyright (C) 2011 The Guava Authors
 *
 * 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.google.common.cache;

import com.google.common.cache.AbstractCache.SimpleStatsCounter;
import com.google.common.cache.AbstractCache.StatsCounter;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Lists;

import junit.framework.TestCase;

import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

/**
 * Unit test for {@link AbstractCache}.
 *
 * @author Charles Fry
 */
public class AbstractCacheTest extends TestCase {

  public void testGetIfPresent() {
    final AtomicReference<Object> valueRef = new AtomicReference();
    Cache<Object, Object> cache = new AbstractCache() {
      @Override
      public Object getIfPresent(Object key) {
        return valueRef.get();
      }
    };

    assertNull(cache.getIfPresent(new Object()));

    Object newValue = new Object();
    valueRef.set(newValue);
    assertSame(newValue, cache.getIfPresent(new Object()));
  }

  public void testGetAllPresent_empty() {
    Cache<Object, Object> cache = new AbstractCache() {
      @Override
      public Object getIfPresent(Object key) {
        return null;
      }
    };

    assertEquals(
        ImmutableMap.of(),
        cache.getAllPresent(ImmutableList.of(new Object())));
  }

  public void testGetAllPresent_cached() {
    final Object cachedKey = new Object();
    final Object cachedValue = new Object();
    Cache<Object, Object> cache = new AbstractCache() {
      @Override
      public Object getIfPresent(Object key) {
        return cachedKey.equals(key) ? cachedValue : null;
      }
    };

    assertEquals(
        ImmutableMap.of(cachedKey, cachedValue),
        cache.getAllPresent(ImmutableList.of(cachedKey, new Object())));
  }

  public void testInvalidateAll() {
    final List<Object> invalidated = Lists.newArrayList();
    Cache<Integer, Integer> cache = new AbstractCache() {
      @Override
      public Integer getIfPresent(Object key) {
        throw new UnsupportedOperationException();
      }

      @Override
      public void invalidate(Object key) {
        invalidated.add(key);
      }
    };

    List<Integer> toInvalidate = ImmutableList.of(1, 2, 3, 4);
    cache.invalidateAll(toInvalidate);
    assertEquals(toInvalidate, invalidated);
  }

  public void testEmptySimpleStats() {
    StatsCounter counter = new SimpleStatsCounter();
    CacheStats stats = counter.snapshot();
    assertEquals(0, stats.requestCount());
    assertEquals(0, stats.hitCount());
    assertEquals(1.0, stats.hitRate());
    assertEquals(0, stats.missCount());
    assertEquals(0.0, stats.missRate());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(0, stats.loadCount());
    assertEquals(0, stats.totalLoadTime());
    assertEquals(0.0, stats.averageLoadPenalty());
    assertEquals(0, stats.evictionCount());
  }

  public void testSingleSimpleStats() {
    StatsCounter counter = new SimpleStatsCounter();
    for (int i = 0; i < 11; i++) {
      counter.recordHits(1);
    }
    for (int i = 0; i < 13; i++) {
      counter.recordLoadSuccess(i);
    }
    for (int i = 0; i < 17; i++) {
      counter.recordLoadException(i);
    }
    for (int i = 0; i < 23; i++) {
      counter.recordMisses(1);
    }
    for (int i = 0; i < 27; i++) {
      counter.recordEviction();
    }
    CacheStats stats = counter.snapshot();
    int requestCount = 11 + 23;
    assertEquals(requestCount, stats.requestCount());
    assertEquals(11, stats.hitCount());
    assertEquals(11.0 / requestCount, stats.hitRate());
    int missCount = 23;
    assertEquals(missCount, stats.missCount());
    assertEquals(((double) missCount) / requestCount, stats.missRate());
    assertEquals(13, stats.loadSuccessCount());
    assertEquals(17, stats.loadExceptionCount());
    assertEquals(13 + 17, stats.loadCount());
    assertEquals(214, stats.totalLoadTime());
    assertEquals(214.0 / (13 + 17), stats.averageLoadPenalty());
    assertEquals(27, stats.evictionCount());
  }

  public void testSimpleStatsIncrementBy() {
    long totalLoadTime = 0;

    SimpleStatsCounter counter1 = new SimpleStatsCounter();
    for (int i = 0; i < 11; i++) {
      counter1.recordHits(1);
    }
    for (int i = 0; i < 13; i++) {
      counter1.recordLoadSuccess(i);
      totalLoadTime += i;
    }
    for (int i = 0; i < 17; i++) {
      counter1.recordLoadException(i);
      totalLoadTime += i;
    }
    for (int i = 0; i < 19; i++) {
      counter1.recordMisses(1);
    }
    for (int i = 0; i < 23; i++) {
      counter1.recordEviction();
    }

    SimpleStatsCounter counter2 = new SimpleStatsCounter();
    for (int i = 0; i < 27; i++) {
      counter2.recordHits(1);
    }
    for (int i = 0; i < 31; i++) {
      counter2.recordLoadSuccess(i);
      totalLoadTime += i;
    }
    for (int i = 0; i < 37; i++) {
      counter2.recordLoadException(i);
      totalLoadTime += i;
    }
    for (int i = 0; i < 41; i++) {
      counter2.recordMisses(1);
    }
    for (int i = 0; i < 43; i++) {
      counter2.recordEviction();
    }

    counter1.incrementBy(counter2);
    assertEquals(new CacheStats(38, 60, 44, 54, totalLoadTime, 66),
        counter1.snapshot());
  }

}




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