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58 lines
2.4 KiB
Java
58 lines
2.4 KiB
Java
// Copyright 2016 The Nomulus Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package google.registry.util;
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import static com.google.common.base.Suppliers.memoizeWithExpiration;
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import static java.util.concurrent.TimeUnit.MILLISECONDS;
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import static org.joda.time.Duration.ZERO;
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import com.google.common.base.Supplier;
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import google.registry.config.RegistryEnvironment;
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import org.joda.time.Duration;
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/** Utility methods related to caching. */
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public class CacheUtils {
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private static final RegistryEnvironment ENVIRONMENT = RegistryEnvironment.get();
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/**
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* Memoize a supplier, with a short expiration specified in the environment config.
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*
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* <p>Use this for things that might change while code is running. (For example, the various
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* lists downloaded from the TMCH get updated in datastore and the caches need to be refreshed.)
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*/
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public static <T> Supplier<T> memoizeWithShortExpiration(Supplier<T> original) {
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return memoizeForDuration(original, ENVIRONMENT.config().getSingletonCacheRefreshDuration());
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}
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/**
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* Memoize a supplier, with a long expiration specified in the environment config.
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*
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* <p>Use this for things that are loaded lazily but then will never change. This allows the test
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* config to set the expiration time to zero so that different test values can be substituted in,
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* while allowing the production config to set the expiration to forever.
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*/
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public static <T> Supplier<T> memoizeWithLongExpiration(Supplier<T> original) {
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return memoizeForDuration(original, ENVIRONMENT.config().getSingletonCachePersistDuration());
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}
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/** Memoize a supplier, with a given expiration. */
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private static <T> Supplier<T> memoizeForDuration(Supplier<T> original, Duration expiration) {
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return expiration.isEqual(ZERO)
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? original // memoizeWithExpiration won't accept 0 as a refresh duration.
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: memoizeWithExpiration(original, expiration.getMillis(), MILLISECONDS);
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}
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}
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