Java example source code file (CacheStatsTest.java)

This example Java source code file (CacheStatsTest.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

cachestats, cachestatstest, testcase

The CacheStatsTest.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 junit.framework.TestCase;

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

  public void testEmpty() {
    CacheStats stats = new CacheStats(0, 0, 0, 0, 0, 0);
    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(0.0, stats.loadExceptionRate());
    assertEquals(0, stats.loadCount());
    assertEquals(0, stats.totalLoadTime());
    assertEquals(0.0, stats.averageLoadPenalty());
    assertEquals(0, stats.evictionCount());
  }

  public void testSingle() {
    CacheStats stats = new CacheStats(11, 13, 17, 19, 23, 27);
    assertEquals(24, stats.requestCount());
    assertEquals(11, stats.hitCount());
    assertEquals(11.0/24, stats.hitRate());
    assertEquals(13, stats.missCount());
    assertEquals(13.0/24, stats.missRate());
    assertEquals(17, stats.loadSuccessCount());
    assertEquals(19, stats.loadExceptionCount());
    assertEquals(19.0/36, stats.loadExceptionRate());
    assertEquals(17 + 19, stats.loadCount());
    assertEquals(23, stats.totalLoadTime());
    assertEquals(23.0/(17 + 19), stats.averageLoadPenalty());
    assertEquals(27, stats.evictionCount());
  }

  public void testMinus() {
    CacheStats one = new CacheStats(11, 13, 17, 19, 23, 27);
    CacheStats two = new CacheStats(53, 47, 43, 41, 37, 31);

    CacheStats diff = two.minus(one);
    assertEquals(76, diff.requestCount());
    assertEquals(42, diff.hitCount());
    assertEquals(42.0/76, diff.hitRate());
    assertEquals(34, diff.missCount());
    assertEquals(34.0/76, diff.missRate());
    assertEquals(26, diff.loadSuccessCount());
    assertEquals(22, diff.loadExceptionCount());
    assertEquals(22.0/48, diff.loadExceptionRate());
    assertEquals(26 + 22, diff.loadCount());
    assertEquals(14, diff.totalLoadTime());
    assertEquals(14.0/(26 + 22), diff.averageLoadPenalty());
    assertEquals(4, diff.evictionCount());

    assertEquals(new CacheStats(0, 0, 0, 0, 0, 0), one.minus(two));
  }

  public void testPlus() {
    CacheStats one = new CacheStats(11, 13, 15, 13, 11, 9);
    CacheStats two = new CacheStats(53, 47, 41, 39, 37, 35);

    CacheStats sum = two.plus(one);
    assertEquals(124, sum.requestCount());
    assertEquals(64, sum.hitCount());
    assertEquals(64.0/124, sum.hitRate());
    assertEquals(60, sum.missCount());
    assertEquals(60.0/124, sum.missRate());
    assertEquals(56, sum.loadSuccessCount());
    assertEquals(52, sum.loadExceptionCount());
    assertEquals(52.0/108, sum.loadExceptionRate());
    assertEquals(56 + 52, sum.loadCount());
    assertEquals(48, sum.totalLoadTime());
    assertEquals(48.0/(56 + 52), sum.averageLoadPenalty());
    assertEquals(44, sum.evictionCount());

    assertEquals(sum, one.plus(two));
  }
}