| // 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 com.google.gerrit.server.cache.EvictionPolicy.LFU; |
| import static java.util.concurrent.TimeUnit.DAYS; |
| import static java.util.concurrent.TimeUnit.SECONDS; |
| |
| import com.google.inject.Inject; |
| import com.google.inject.Provider; |
| import com.google.inject.ProvisionException; |
| |
| import net.sf.ehcache.Ehcache; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| final class CacheProvider<K, V> implements Provider<Cache<K, V>>, |
| NamedCacheBinding, UnnamedCacheBinding { |
| private final boolean disk; |
| private int memoryLimit; |
| private int diskLimit; |
| private long maxAge; |
| private EvictionPolicy evictionPolicy; |
| private String cacheName; |
| private ProxyEhcache cache; |
| |
| CacheProvider(final boolean disk) { |
| this.disk = disk; |
| |
| memoryLimit(1024); |
| maxAge(90, DAYS); |
| evictionPolicy(LFU); |
| |
| if (disk) { |
| diskLimit(16384); |
| } |
| } |
| |
| @Inject |
| void setCachePool(final CachePool pool) { |
| this.cache = pool.register(this); |
| } |
| |
| void bind(final Ehcache ehcache) { |
| cache.bind(ehcache); |
| } |
| |
| String getName() { |
| if (cacheName == null) { |
| throw new ProvisionException("Cache has no name"); |
| } |
| return cacheName; |
| } |
| |
| boolean disk() { |
| return disk; |
| } |
| |
| int memoryLimit() { |
| return memoryLimit; |
| } |
| |
| int diskLimit() { |
| return diskLimit; |
| } |
| |
| long maxAge() { |
| return maxAge; |
| } |
| |
| EvictionPolicy evictionPolicy() { |
| return evictionPolicy; |
| } |
| |
| public NamedCacheBinding name(final String name) { |
| if (cacheName != null) { |
| throw new IllegalStateException("Cache name already set"); |
| } |
| cacheName = name; |
| return this; |
| } |
| |
| public NamedCacheBinding memoryLimit(final int objects) { |
| memoryLimit = objects; |
| return this; |
| } |
| |
| public NamedCacheBinding diskLimit(final int objects) { |
| if (!disk) { |
| // TODO This should really be a compile time type error, but I'm |
| // too lazy to create the mess of permutations required to setup |
| // type safe returns for bindings in our little DSL. |
| // |
| throw new IllegalStateException("Cache is not disk based"); |
| } |
| diskLimit = objects; |
| return this; |
| } |
| |
| public NamedCacheBinding maxAge(final long duration, final TimeUnit unit) { |
| maxAge = SECONDS.convert(duration, unit); |
| return this; |
| } |
| |
| @Override |
| public NamedCacheBinding evictionPolicy(final EvictionPolicy policy) { |
| evictionPolicy = policy; |
| return this; |
| } |
| |
| public Cache<K, V> get() { |
| if (cache == null) { |
| throw new ProvisionException("Cache \"" + cacheName + "\" not available"); |
| } |
| return new SimpleCache<K, V>(cache); |
| } |
| } |