Java example source code file (CacheManualTest.java)

This example Java source code file (CacheManualTest.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

cache, cachemanualtest, cachestats, integer, object, testcase

The CacheManualTest.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 static java.util.Arrays.asList;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;

import junit.framework.TestCase;

/**
 * @author Charles Fry
 */
public class CacheManualTest extends TestCase {

  public void testGetIfPresent() {
    Cache<Object, Object> cache = CacheBuilder.newBuilder().recordStats().build();
    CacheStats stats = cache.stats();
    assertEquals(0, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(0, stats.hitCount());

    Object one = new Object();
    Object two = new Object();

    assertNull(cache.getIfPresent(one));
    stats = cache.stats();
    assertEquals(1, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(0, stats.hitCount());
    assertNull(cache.asMap().get(one));
    assertFalse(cache.asMap().containsKey(one));
    assertFalse(cache.asMap().containsValue(two));

    assertNull(cache.getIfPresent(two));
    stats = cache.stats();
    assertEquals(2, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(0, stats.hitCount());
    assertNull(cache.asMap().get(two));
    assertFalse(cache.asMap().containsKey(two));
    assertFalse(cache.asMap().containsValue(one));

    cache.put(one, two);

    assertSame(two, cache.getIfPresent(one));
    stats = cache.stats();
    assertEquals(2, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(1, stats.hitCount());
    assertSame(two, cache.asMap().get(one));
    assertTrue(cache.asMap().containsKey(one));
    assertTrue(cache.asMap().containsValue(two));

    assertNull(cache.getIfPresent(two));
    stats = cache.stats();
    assertEquals(3, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(1, stats.hitCount());
    assertNull(cache.asMap().get(two));
    assertFalse(cache.asMap().containsKey(two));
    assertFalse(cache.asMap().containsValue(one));

    cache.put(two, one);

    assertSame(two, cache.getIfPresent(one));
    stats = cache.stats();
    assertEquals(3, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(2, stats.hitCount());
    assertSame(two, cache.asMap().get(one));
    assertTrue(cache.asMap().containsKey(one));
    assertTrue(cache.asMap().containsValue(two));

    assertSame(one, cache.getIfPresent(two));
    stats = cache.stats();
    assertEquals(3, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(3, stats.hitCount());
    assertSame(one, cache.asMap().get(two));
    assertTrue(cache.asMap().containsKey(two));
    assertTrue(cache.asMap().containsValue(one));
  }

  public void testGetAllPresent() {
    Cache<Integer, Integer> cache = CacheBuilder.newBuilder().recordStats().build();
    CacheStats stats = cache.stats();
    assertEquals(0, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(0, stats.hitCount());

    assertEquals(ImmutableMap.of(), cache.getAllPresent(ImmutableList.<Integer>of()));
    stats = cache.stats();
    assertEquals(0, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(0, stats.hitCount());

    assertEquals(ImmutableMap.of(), cache.getAllPresent(asList(1, 2, 3)));
    stats = cache.stats();
    assertEquals(3, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(0, stats.hitCount());

    cache.put(2, 22);

    assertEquals(ImmutableMap.of(2, 22), cache.getAllPresent(asList(1, 2, 3)));
    stats = cache.stats();
    assertEquals(5, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(1, stats.hitCount());

    cache.put(3, 33);

    assertEquals(ImmutableMap.of(2, 22, 3, 33), cache.getAllPresent(asList(1, 2, 3)));
    stats = cache.stats();
    assertEquals(6, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(3, stats.hitCount());

    cache.put(1, 11);

    assertEquals(ImmutableMap.of(1, 11, 2, 22, 3, 33), cache.getAllPresent(asList(1, 2, 3)));
    stats = cache.stats();
    assertEquals(6, stats.missCount());
    assertEquals(0, stats.loadSuccessCount());
    assertEquals(0, stats.loadExceptionCount());
    assertEquals(6, stats.hitCount());
  }

}