65 lines
2.2 KiB
Java
65 lines
2.2 KiB
Java
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/**
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* This is free and unencumbered software released into the public domain.
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*
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* Anyone is free to copy, modify, publish, use, compile, sell, or
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* distribute this software, either in source code form or as a compiled
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* binary, for any purpose, commercial or non-commercial, and by any
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* means.
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*
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* In jurisdictions that recognize copyright laws, the author or authors
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* of this software dedicate any and all copyright interest in the
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* software to the public domain. We make this dedication for the benefit
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* of the public at large and to the detriment of our heirs and
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* successors. We intend this dedication to be an overt act of
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* relinquishment in perpetuity of all present and future rights to this
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* software under copyright law.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* For more information, please refer to <http://unlicense.org/>
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*/
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package com.imaginarycode.minecraft.redisbungee.util;
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import java.util.concurrent.Callable;
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import java.util.concurrent.ConcurrentHashMap;
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import java.util.concurrent.ConcurrentMap;
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import java.util.concurrent.ExecutionException;
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// I would use the Guava, but can't because I need a few more properties.
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public class InternalCache<K, V> {
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private final ConcurrentMap<K, V> map = new ConcurrentHashMap<>(128, 0.75f, 4);
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public V get(K key, Callable<V> loader) throws ExecutionException {
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V value = map.get(key);
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if (value == null) {
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try {
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value = loader.call();
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} catch (Exception e) {
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throw new ExecutionException(e);
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}
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if (value == null)
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return null;
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map.putIfAbsent(key, value);
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}
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return value;
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}
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public V put(K key, V value) {
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return map.put(key, value);
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}
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public void invalidate(K key) {
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map.remove(key);
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}
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}
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