com.hotels.styx.api.common.Caches Maven / Gradle / Ivy
/*
Copyright (C) 2013-2018 Expedia Inc.
Licensed 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.
*/
package com.hotels.styx.api.common;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import java.util.function.Function;
/**
* Provides convenience method(s) for using Guava's loading cache.
*/
public final class Caches {
private Caches() {
}
/**
* Creates a LoadingCache with default settings.
*
* @param loadingFunction loading function
* @param key type
* @param value type
* @return loading cache
*/
public static LoadingCache cache(Function loadingFunction) {
return CacheBuilder.newBuilder()
.build(new CacheLoader() {
@Override
public V load(K key) throws Exception {
return loadingFunction.apply(key);
}
});
}
}