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c458c05801
The dark lord Gosling designed the Java package naming system so that ownership flows from the DNS system. Since we own the domain name registry.google, it seems only appropriate that we should use google.registry as our package name.
60 lines
2.5 KiB
Java
60 lines
2.5 KiB
Java
// Copyright 2016 The Domain Registry 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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