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fixup! update shardsizeexpression every 10 seconds
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with this work for | ||
| * additional information regarding copyright ownership. Crate 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. | ||
| * | ||
| * However, if you have executed another commercial license agreement | ||
| * with Crate these terms will supersede the license and you may use the | ||
| * software solely pursuant to the terms of the relevant commercial agreement. | ||
| */ | ||
|
|
||
| package io.crate.core; | ||
|
|
||
| import java.util.concurrent.TimeUnit; | ||
|
|
||
| /** | ||
| * A cache for a single reference that is cached for <code>cacheTime</code> milliseconds | ||
| * and after that refreshed by calling {@link #refresh()} on new access to {@link #get()}. | ||
| * @param <T> | ||
| */ | ||
| public abstract class CachedRef<T> { | ||
|
|
||
| private final long cacheTime; | ||
| private long cachedAt = 0L; | ||
| private volatile T value = null; | ||
|
|
||
| public CachedRef(long cacheTime, TimeUnit timeUnit) { | ||
| this.cacheTime = timeUnit.toMillis(cacheTime); | ||
| } | ||
|
|
||
| /** | ||
| * guaranteed to be not null if {@link #refresh()} does not return null. | ||
| * @return the cached value or a refreshed one. | ||
| */ | ||
| public T get() { | ||
| ensureValue(); | ||
| return value; | ||
| } | ||
|
|
||
| private synchronized void ensureValue() { | ||
| long curTime = System.currentTimeMillis(); | ||
| if (value == null || curTime - cachedAt > cacheTime) { | ||
| value = refresh(); | ||
| cachedAt = curTime; | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * create a new value | ||
| * @return the new value | ||
| */ | ||
| public abstract T refresh(); | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,71 @@ | ||
| /* | ||
| * Licensed to CRATE Technology GmbH ("Crate") under one or more contributor | ||
| * license agreements. See the NOTICE file distributed with this work for | ||
| * additional information regarding copyright ownership. Crate 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. | ||
| * | ||
| * However, if you have executed another commercial license agreement | ||
| * with Crate these terms will supersede the license and you may use the | ||
| * software solely pursuant to the terms of the relevant commercial agreement. | ||
| */ | ||
|
|
||
| package io.crate.core; | ||
|
|
||
| import com.carrotsearch.randomizedtesting.annotations.Repeat; | ||
| import io.crate.test.integration.CrateUnitTest; | ||
| import org.junit.Test; | ||
|
|
||
| import java.util.concurrent.TimeUnit; | ||
| import java.util.concurrent.atomic.AtomicLong; | ||
|
|
||
| import static org.hamcrest.Matchers.greaterThan; | ||
| import static org.hamcrest.Matchers.is; | ||
|
|
||
| public class CachedRefTest extends CrateUnitTest { | ||
|
|
||
| @Test | ||
| public void testZeroCacheAlwaysRefresh() throws Exception { | ||
| CachedRef<Long> longCache = new CachedRef<Long>(0, TimeUnit.MILLISECONDS) { | ||
| private AtomicLong internalLong = new AtomicLong(0L); | ||
| @Override | ||
| public Long refresh() { | ||
| return internalLong.incrementAndGet(); | ||
| } | ||
| }; | ||
| long previous = -1L; | ||
| for (int i = 0; i < 1000; i++) { | ||
| long cur = longCache.get(); | ||
| assertThat(cur, is(greaterThan(previous))); | ||
| previous = cur; | ||
| Thread.sleep(1); | ||
| } | ||
| } | ||
|
|
||
| @Repeat(iterations=10) | ||
| @Test | ||
| public void testRefresh() throws Exception { | ||
| CachedRef<Long> longCache = new CachedRef<Long>(10, TimeUnit.MILLISECONDS) { | ||
| private AtomicLong internalLong = new AtomicLong(0L); | ||
| @Override | ||
| public Long refresh() { | ||
| return internalLong.incrementAndGet(); | ||
| } | ||
| }; | ||
|
|
||
| long first = longCache.get(); | ||
| assertThat(first, is(1L)); | ||
| assertThat(longCache.get(), is(first)); | ||
| Thread.sleep(12); | ||
| assertThat(longCache.get(), is(2L)); | ||
| } | ||
| } |
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