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utils: add wrapper for the loading cache
Follow up for apache#9638 Creates a utility class LazyCache which currently wraps Caffeine library Cache class. Signed-off-by: Abhishek Kumar <[email protected]>
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48 changes: 48 additions & 0 deletions
48
utils/src/main/java/org/apache/cloudstack/utils/cache/LazyCache.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF 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. | ||
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| package org.apache.cloudstack.utils.cache; | ||
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| import java.util.concurrent.TimeUnit; | ||
| import java.util.function.Function; | ||
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| import com.github.benmanes.caffeine.cache.Caffeine; | ||
| import com.github.benmanes.caffeine.cache.LoadingCache; | ||
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| public class LazyCache<K, V> { | ||
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| private final LoadingCache<K, V> cache; | ||
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| public LazyCache(long maximumSize, long expireAfterWriteSeconds, Function<K, V> loader) { | ||
| this.cache = Caffeine.newBuilder() | ||
| .maximumSize(maximumSize) | ||
| .expireAfterWrite(expireAfterWriteSeconds, TimeUnit.SECONDS) | ||
| .build(loader::apply); | ||
| } | ||
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| public V get(K key) { | ||
| return cache.get(key); | ||
| } | ||
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| public void invalidate(K key) { | ||
| cache.invalidate(key); | ||
| } | ||
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| public void clear() { | ||
| cache.invalidateAll(); | ||
| } | ||
| } |
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115
utils/src/test/java/org/apache/cloudstack/utils/cache/LazyCacheTest.java
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| // Licensed to the Apache Software Foundation (ASF) under one | ||
| // or more contributor license agreements. See the NOTICE file | ||
| // distributed with this work for additional information | ||
| // regarding copyright ownership. The ASF 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. | ||
|
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| package org.apache.cloudstack.utils.cache; | ||
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| import static org.junit.Assert.assertEquals; | ||
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| import java.util.function.Function; | ||
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| import org.junit.Assert; | ||
| import org.junit.Before; | ||
| import org.junit.Test; | ||
| import org.junit.runner.RunWith; | ||
| import org.mockito.Mockito; | ||
| import org.mockito.junit.MockitoJUnitRunner; | ||
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| @RunWith(MockitoJUnitRunner.class) | ||
| public class LazyCacheTest { | ||
| private final long expireSeconds = 1; | ||
| private final String cacheValuePrefix = "ComputedValueFor:"; | ||
| private LazyCache<String, String> cache; | ||
| private Function<String, String> mockLoader; | ||
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| @Before | ||
| public void setUp() { | ||
| mockLoader = Mockito.mock(Function.class); | ||
| Mockito.when(mockLoader.apply(Mockito.anyString())).thenAnswer(invocation -> cacheValuePrefix + invocation.getArgument(0)); | ||
| cache = new LazyCache<>(4, expireSeconds, mockLoader); | ||
| } | ||
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| @Test | ||
| public void testCacheMissAndLoader() { | ||
| String key = "key1"; | ||
| String value = cache.get(key); | ||
| assertEquals(cacheValuePrefix + key, value); | ||
| Mockito.verify(mockLoader).apply(key); | ||
| } | ||
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| @Test | ||
| public void testLoaderNotCalledIfPresent() { | ||
| String key = "key2"; | ||
| cache.get(key); | ||
| try { | ||
| Thread.sleep((long)(0.9 * expireSeconds * 1000)); | ||
| } catch (InterruptedException ie) { | ||
| Assert.fail(String.format("Exception occurred: %s", ie.getMessage())); | ||
| } | ||
| cache.get(key); | ||
| Mockito.verify(mockLoader, Mockito.times(1)).apply(key); | ||
| } | ||
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| @Test | ||
| public void testCacheExpiration() { | ||
| String key = "key3"; | ||
| cache.get(key); | ||
| try { | ||
| Thread.sleep((long)(1.1 * expireSeconds * 1000)); | ||
| } catch (InterruptedException ie) { | ||
| Assert.fail(String.format("Exception occurred: %s", ie.getMessage())); | ||
| } | ||
| cache.get(key); | ||
| Mockito.verify(mockLoader, Mockito.times(2)).apply(key); | ||
| } | ||
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| @Test | ||
| public void testInvalidateKey() { | ||
| String key = "key4"; | ||
| cache.get(key); | ||
| cache.invalidate(key); | ||
| cache.get(key); | ||
| Mockito.verify(mockLoader, Mockito.times(2)).apply(key); | ||
| } | ||
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| @Test | ||
| public void testClearCache() { | ||
| String key1 = "key5"; | ||
| String key2 = "key6"; | ||
| cache.get(key1); | ||
| cache.get(key2); | ||
| cache.clear(); | ||
| cache.get(key1); | ||
| Mockito.verify(mockLoader, Mockito.times(2)).apply(key1); | ||
| Mockito.verify(mockLoader, Mockito.times(1)).apply(key2); | ||
| } | ||
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| @Test | ||
| public void testMaximumSize() { | ||
| String key = "key7"; | ||
| cache.get(key); | ||
| for (int i = 0; i < 4; i++) { | ||
| cache.get(String.format("newkey-%d", i)); | ||
| } | ||
| try { | ||
| Thread.sleep(100); | ||
| } catch (InterruptedException ie) { | ||
| Assert.fail(String.format("Exception occurred: %s", ie.getMessage())); | ||
| } | ||
| cache.get(key); | ||
| Mockito.verify(mockLoader, Mockito.times(2)).apply(key); | ||
| } | ||
| } |