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/*
* 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 com.google.common.cache.TestingCacheLoaders.incrementingLoader;
import static java.util.concurrent.TimeUnit.MILLISECONDS;
import com.google.common.cache.TestingCacheLoaders.IncrementingLoader;
import com.google.common.testing.FakeTicker;
import junit.framework.TestCase;
/**
* Tests relating to automatic cache refreshing.
*
* @author Charles Fry
*/
public class CacheRefreshTest extends TestCase {
public void testAutoRefresh() {
FakeTicker ticker = new FakeTicker();
IncrementingLoader loader = incrementingLoader();
LoadingCache<Integer, Integer> cache =
CacheBuilder.newBuilder()
.refreshAfterWrite(3, MILLISECONDS)
.expireAfterWrite(6, MILLISECONDS)
.lenientParsing()
.ticker(ticker)
.build(loader);
int expectedLoads = 0;
int expectedReloads = 0;
for (int i = 0; i < 3; i++) {
assertEquals(Integer.valueOf(i), cache.getUnchecked(i));
expectedLoads++;
assertEquals(expectedLoads, loader.getLoadCount());
assertEquals(expectedReloads, loader.getReloadCount());
ticker.advance(1, MILLISECONDS);
}
assertEquals(Integer.valueOf(0), cache.getUnchecked(0));
assertEquals(Integer.valueOf(1), cache.getUnchecked(1));
assertEquals(Integer.valueOf(2), cache.getUnchecked(2));
assertEquals(expectedLoads, loader.getLoadCount());
assertEquals(expectedReloads, loader.getReloadCount());
// refresh 0
ticker.advance(1, MILLISECONDS);
assertEquals(Integer.valueOf(1), cache.getUnchecked(0));
expectedReloads++;
assertEquals(Integer.valueOf(1), cache.getUnchecked(1));
assertEquals(Integer.valueOf(2), cache.getUnchecked(2));
assertEquals(expectedLoads, loader.getLoadCount());
assertEquals(expectedReloads, loader.getReloadCount());
// write to 1 to delay its refresh
cache.asMap().put(1, -1);
ticker.advance(1, MILLISECONDS);
assertEquals(Integer.valueOf(1), cache.getUnchecked(0));
assertEquals(Integer.valueOf(-1), cache.getUnchecked(1));
assertEquals(Integer.valueOf(2), cache.getUnchecked(2));
assertEquals(expectedLoads, loader.getLoadCount());
assertEquals(expectedReloads, loader.getReloadCount());
// refresh 2
ticker.advance(1, MILLISECONDS);
assertEquals(Integer.valueOf(1), cache.getUnchecked(0));
assertEquals(Integer.valueOf(-1), cache.getUnchecked(1));
assertEquals(Integer.valueOf(3), cache.getUnchecked(2));
expectedReloads++;
assertEquals(expectedLoads, loader.getLoadCount());
assertEquals(expectedReloads, loader.getReloadCount());
ticker.advance(1, MILLISECONDS);
assertEquals(Integer.valueOf(1), cache.getUnchecked(0));
assertEquals(Integer.valueOf(-1), cache.getUnchecked(1));
assertEquals(Integer.valueOf(3), cache.getUnchecked(2));
assertEquals(expectedLoads, loader.getLoadCount());
assertEquals(expectedReloads, loader.getReloadCount());
// refresh 0 and 1
ticker.advance(1, MILLISECONDS);
assertEquals(Integer.valueOf(2), cache.getUnchecked(0));
expectedReloads++;
assertEquals(Integer.valueOf(0), cache.getUnchecked(1));
expectedReloads++;
assertEquals(Integer.valueOf(3), cache.getUnchecked(2));
assertEquals(expectedLoads, loader.getLoadCount());
assertEquals(expectedReloads, loader.getReloadCount());
}
}
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