com.github.mjeanroy.dbunit.cache.GuavaCache Maven / Gradle / Ivy
/**
* The MIT License (MIT)
*
* Copyright (c) 2015-2019 Mickael Jeanroy
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.github.mjeanroy.dbunit.cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.LoadingCache;
/**
* {@link Cache} implementation using Guava {@link LoadingCache}.
*
* @param Type of keys in the cache.
* @param Type of values.
*/
class GuavaCache implements Cache {
/**
* Internal Guava cache.
*/
private final LoadingCache cache;
/**
* Create cache.
*
* @param loader Loader used to compute values in the cache.
*/
GuavaCache(CacheLoader loader) {
this.cache = CacheBuilder.newBuilder().build(new GuavaCacheLoaderAdapter<>(loader));
}
@Override
public V load(K key) {
return cache.getUnchecked(key);
}
@Override
public void clear() {
cache.invalidateAll();
}
@Override
public long size() {
return cache.size();
}
/**
* Simple adapter to translate {@link CacheLoader} to Guava {@link com.google.common.cache.CacheLoader}.
*
* @param Type of keys.
* @param Type of values.
*/
private static class GuavaCacheLoaderAdapter extends com.google.common.cache.CacheLoader {
private final CacheLoader loader;
private GuavaCacheLoaderAdapter(CacheLoader loader) {
this.loader = loader;
}
@Override
public V load(K key) throws Exception {
return loader.load(key);
}
}
}