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9f142c6767
This allows us to use util methods from within config, which is a useful thing to be able to do for, e.g., being able to log errors while loading configuration. It makes sense that the util package should be at the very base of the class inheritance hierarchy; config seems logically higher than it. ------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=144324273
40 lines
1.6 KiB
Java
40 lines
1.6 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.model;
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import static com.google.common.base.Suppliers.memoizeWithExpiration;
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import static google.registry.config.RegistryConfig.getSingletonCacheRefreshDuration;
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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 org.joda.time.Duration;
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/** Utility methods related to caching Datastore entities. */
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public class CacheUtils {
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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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Duration expiration = getSingletonCacheRefreshDuration();
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return expiration.isEqual(ZERO)
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? original
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: memoizeWithExpiration(original, expiration.getMillis(), MILLISECONDS);
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}
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}
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