/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you 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 org.elasticsearch.common.util;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.test.ESTestCase;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
public class SingleObjectCacheTests extends ESTestCase {
public void testRefresh() {
final AtomicInteger count = new AtomicInteger(0);
final AtomicBoolean needsRefresh = new AtomicBoolean(true);
SingleObjectCache<Integer> cache = new SingleObjectCache<Integer>(TimeValue.timeValueMillis(100000), 0) {
@Override
protected Integer refresh() {
return count.incrementAndGet();
}
@Override
protected boolean needsRefresh() {
return needsRefresh.get();
}
};
assertEquals(1, cache.getOrRefresh().intValue());
assertEquals(2, cache.getOrRefresh().intValue());
needsRefresh.set(false);
assertEquals(2, cache.getOrRefresh().intValue());
needsRefresh.set(true);
assertEquals(3, cache.getOrRefresh().intValue());
}
public void testRefreshDoesntBlock() throws InterruptedException {
final AtomicInteger count = new AtomicInteger(0);
final AtomicBoolean needsRefresh = new AtomicBoolean(true);
final CountDownLatch latch = new CountDownLatch(1);
final CountDownLatch waiting = new CountDownLatch(1);
final SingleObjectCache<Integer> cache = new SingleObjectCache<Integer>(TimeValue.timeValueMillis(1000), 0) {
@Override
protected Integer refresh() {
if (count.get() == 1) {
try {
waiting.countDown();
latch.await();
} catch (InterruptedException e) {
assert false;
}
}
return count.incrementAndGet();
}
@Override
protected boolean needsRefresh() {
return needsRefresh.get();
}
};
assertEquals(1, cache.getOrRefresh().intValue());
needsRefresh.set(true);
Thread t = new Thread() {
@Override
public void run() {
Integer value = cache.getOrRefresh();
assertEquals(2, value.intValue());
}
};
t.start();
waiting.await();
assertEquals(1, cache.getOrRefresh().intValue());
needsRefresh.set(false);
latch.countDown();
t.join();
assertEquals(2, cache.getOrRefresh().intValue());
}
}