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SingleCached.java
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SingleCached.java
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/*
* Copyright (C) Posten Norge AS
*
* 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 no.digipost.cache2.inmemory;
import no.digipost.cache2.loader.Callables;
import no.digipost.cache2.loader.Loader;
import java.util.List;
import java.util.UUID;
import java.util.concurrent.Callable;
import java.util.stream.Stream;
import static java.util.Arrays.asList;
import static java.util.stream.Collectors.toList;
import static java.util.stream.Stream.concat;
import static no.digipost.cache2.inmemory.CacheConfig.initialCapacity;
import static no.digipost.cache2.inmemory.CacheConfig.maximumSize;
/**
* Adapts the {@link Cache} to be more appropriate for single value caches.
*
* @param <V> The type of the single element contained in this cache.
*/
public final class SingleCached<V> {
private final Cache<String, V> cache;
private final Loader<? super String, V> resolver;
private String key;
public SingleCached(Callable<V> resolver, CacheConfig ... configs) {
this(Callables.toLoader(resolver), configs);
}
public SingleCached(Loader<? super String, V> resolver, CacheConfig ... configs) {
this(resolver, asList(configs));
}
public SingleCached(String name, Callable<V> resolver, CacheConfig ... configs) {
this(name, Callables.toLoader(resolver), configs);
}
public SingleCached(String name, Loader<? super String, V> resolver, CacheConfig ... configs) {
this(name, resolver, asList(configs));
}
public SingleCached(Callable<V> resolver, List<CacheConfig> configs) {
this(Callables.toLoader(resolver), configs);
}
public SingleCached(Loader<? super String, V> resolver, List<CacheConfig> configs) {
this("single-value-cache-" + UUID.randomUUID(), resolver, configs);
}
public SingleCached(String name, Callable<V> resolver, List<CacheConfig> configs) {
this(name, Callables.toLoader(resolver), configs);
}
public SingleCached(String name, Loader<? super String, V> resolver, List<CacheConfig> configs) {
this(name + "-cachekey", resolver, Cache.create(name, concat(Stream.of(initialCapacity(1), maximumSize(1)), configs.stream()).collect(toList())));
}
SingleCached(String cacheKey, Loader<? super String, V> resolver, Cache<String, V> underlyingCache) {
this.cache = underlyingCache;
this.resolver = resolver;
this.key = cacheKey;
}
public V get() {
return cache.get(key, resolver);
}
public void invalidate() {
cache.invalidateAll();
}
}