| // Copyright (C) 2012 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 com.google.common.base.Preconditions; |
| import com.google.common.base.Strings; |
| import com.google.common.cache.Cache; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.Weigher; |
| import com.google.gerrit.common.Nullable; |
| import com.google.gerrit.extensions.annotations.PluginName; |
| import com.google.inject.Inject; |
| import com.google.inject.Provider; |
| import com.google.inject.TypeLiteral; |
| |
| import java.util.concurrent.TimeUnit; |
| |
| class CacheProvider<K, V> |
| implements Provider<Cache<K, V>>, |
| CacheBinding<K, V> { |
| private final CacheModule module; |
| final String name; |
| private final TypeLiteral<K> keyType; |
| private final TypeLiteral<V> valType; |
| private boolean persist; |
| private long maximumWeight; |
| private Long expireAfterWrite; |
| private Provider<CacheLoader<K, V>> loader; |
| private Provider<Weigher<K, V>> weigher; |
| |
| private String plugin; |
| private MemoryCacheFactory memoryCacheFactory; |
| private PersistentCacheFactory persistentCacheFactory; |
| private boolean frozen; |
| |
| CacheProvider(CacheModule module, |
| String name, |
| TypeLiteral<K> keyType, |
| TypeLiteral<V> valType) { |
| this.module = module; |
| this.name = name; |
| this.keyType = keyType; |
| this.valType = valType; |
| } |
| |
| @Inject(optional = true) |
| void setPluginName(@PluginName String pluginName) { |
| this.plugin = pluginName; |
| } |
| |
| @Inject |
| void setMemoryCacheFactory(MemoryCacheFactory factory) { |
| this.memoryCacheFactory = factory; |
| } |
| |
| @Inject(optional = true) |
| void setPersistentCacheFactory(@Nullable PersistentCacheFactory factory) { |
| this.persistentCacheFactory = factory; |
| } |
| |
| CacheBinding<K, V> persist(boolean p) { |
| Preconditions.checkState(!frozen, "binding frozen, cannot be modified"); |
| persist = p; |
| return this; |
| } |
| |
| @Override |
| public CacheBinding<K, V> maximumWeight(long weight) { |
| Preconditions.checkState(!frozen, "binding frozen, cannot be modified"); |
| maximumWeight = weight; |
| return this; |
| } |
| |
| @Override |
| public CacheBinding<K, V> expireAfterWrite(long duration, TimeUnit unit) { |
| Preconditions.checkState(!frozen, "binding frozen, cannot be modified"); |
| expireAfterWrite = SECONDS.convert(duration, unit); |
| return this; |
| } |
| |
| @Override |
| public CacheBinding<K, V> loader(Class<? extends CacheLoader<K, V>> impl) { |
| Preconditions.checkState(!frozen, "binding frozen, cannot be modified"); |
| loader = module.bindCacheLoader(this, impl); |
| return this; |
| } |
| |
| @Override |
| public CacheBinding<K, V> weigher(Class<? extends Weigher<K, V>> impl) { |
| Preconditions.checkState(!frozen, "binding frozen, cannot be modified"); |
| weigher = module.bindWeigher(this, impl); |
| return this; |
| } |
| |
| @Override |
| public String name() { |
| if (!Strings.isNullOrEmpty(plugin)) { |
| return plugin + "." + name; |
| } |
| return name; |
| } |
| |
| @Override |
| public TypeLiteral<K> keyType() { |
| return keyType; |
| } |
| |
| @Override |
| public TypeLiteral<V> valueType() { |
| return valType; |
| } |
| |
| @Override |
| public long maximumWeight() { |
| return maximumWeight; |
| } |
| |
| @Override |
| @Nullable |
| public Long expireAfterWrite(TimeUnit unit) { |
| return expireAfterWrite != null |
| ? unit.convert(expireAfterWrite, SECONDS) |
| : null; |
| } |
| |
| @Override |
| @Nullable |
| public Weigher<K, V> weigher() { |
| return weigher != null ? weigher.get() : null; |
| } |
| |
| @Override |
| @Nullable |
| public CacheLoader<K, V> loader() { |
| return loader != null ? loader.get() : null; |
| } |
| |
| @Override |
| public Cache<K, V> get() { |
| frozen = true; |
| |
| if (loader != null) { |
| CacheLoader<K, V> ldr = loader.get(); |
| if (persist && persistentCacheFactory != null) { |
| return persistentCacheFactory.build(this, ldr); |
| } |
| return memoryCacheFactory.build(this, ldr); |
| } else if (persist && persistentCacheFactory != null) { |
| return persistentCacheFactory.build(this); |
| } else { |
| return memoryCacheFactory.build(this); |
| } |
| } |
| } |