| // Copyright (C) 2009 The Android Open Source Project |
| // |
| // 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.google.gerrit.server.cache; |
| |
| import static java.util.concurrent.TimeUnit.SECONDS; |
| |
| import net.sf.ehcache.CacheException; |
| import net.sf.ehcache.Ehcache; |
| import net.sf.ehcache.Element; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| /** |
| * A fast in-memory and/or on-disk based cache. |
| * |
| * @type <K> type of key used to lookup entries in the cache. |
| * @type <V> type of value stored within each cache entry. |
| */ |
| final class SimpleCache<K, V> implements Cache<K, V> { |
| private static final Logger log = LoggerFactory.getLogger(SimpleCache.class); |
| |
| private final Ehcache self; |
| |
| SimpleCache(final Ehcache self) { |
| this.self = self; |
| } |
| |
| Ehcache getEhcache() { |
| return self; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public V get(final K key) { |
| if (key == null) { |
| return null; |
| } |
| final Element m; |
| try { |
| m = self.get(key); |
| } catch (IllegalStateException err) { |
| log.error("Cannot lookup " + key + " in \"" + self.getName() + "\"", err); |
| return null; |
| } catch (CacheException err) { |
| log.error("Cannot lookup " + key + " in \"" + self.getName() + "\"", err); |
| return null; |
| } |
| return m != null ? (V) m.getObjectValue() : null; |
| } |
| |
| public void put(final K key, final V value) { |
| self.put(new Element(key, value)); |
| } |
| |
| public void remove(final K key) { |
| if (key != null) { |
| self.remove(key); |
| } |
| } |
| |
| @Override |
| public long getTimeToLive(final TimeUnit unit) { |
| final long maxAge = self.getCacheConfiguration().getTimeToLiveSeconds(); |
| return unit.convert(maxAge, SECONDS); |
| } |
| |
| @Override |
| public String toString() { |
| return "Cache[" + self.getName() + "]"; |
| } |
| } |