// 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.h2;
import com.google.common.base.Strings;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.google.common.cache.Weigher;
import com.google.gerrit.lifecycle.LifecycleModule;
import com.google.gerrit.server.cache.CacheBinding;
import com.google.gerrit.server.cache.MemoryCacheFactory;
import com.google.gerrit.server.cache.PersistentCacheFactory;
import com.google.gerrit.server.cache.h2.H2CacheImpl.ValueHolder;
import com.google.gerrit.server.config.ConfigUtil;
import com.google.gerrit.server.config.GerritServerConfig;
import com.google.inject.Inject;
import org.eclipse.jgit.lib.Config;
import java.util.concurrent.TimeUnit;
public class DefaultCacheFactory implements MemoryCacheFactory {
public static class Module extends LifecycleModule {
@Override
protected void configure() {
bind(DefaultCacheFactory.class);
bind(MemoryCacheFactory.class).to(DefaultCacheFactory.class);
bind(PersistentCacheFactory.class).to(H2CacheFactory.class);
listener().to(H2CacheFactory.class);
}
}
private final Config cfg;
@Inject
public DefaultCacheFactory(@GerritServerConfig Config config) {
this.cfg = config;
}
@Override
public <K, V> Cache<K, V> build(CacheBinding<K, V> def) {
return create(def, false).build();
}
@Override
public <K, V> LoadingCache<K, V> build(
CacheBinding<K, V> def,
CacheLoader<K, V> loader) {
return create(def, false).build(loader);
}
@SuppressWarnings("unchecked")
<K, V> CacheBuilder<K, V> create(
CacheBinding<K, V> def,
boolean unwrapValueHolder) {
CacheBuilder<K,V> builder = newCacheBuilder();
builder.recordStats();
builder.maximumWeight(cfg.getLong(
"cache", def.name(), "memoryLimit",
def.maximumWeight()));
Weigher<K, V> weigher = def.weigher();
if (weigher != null && unwrapValueHolder) {
final Weigher<K, V> impl = weigher;
weigher = (Weigher<K, V>) new Weigher<K, ValueHolder<V>> () {
@Override
public int weigh(K key, ValueHolder<V> value) {
return impl.weigh(key, value.value);
}
};
} else if (weigher == null) {
weigher = unitWeight();
}
builder.weigher(weigher);
Long age = def.expireAfterWrite(TimeUnit.SECONDS);
if (has(def.name(), "maxAge")) {
builder.expireAfterWrite(ConfigUtil.getTimeUnit(cfg,
"cache", def.name(), "maxAge",
age != null ? age : 0,
TimeUnit.SECONDS), TimeUnit.SECONDS);
} else if (age != null) {
builder.expireAfterWrite(age, TimeUnit.SECONDS);
}
return builder;
}
private boolean has(String name, String var) {
return !Strings.isNullOrEmpty(cfg.getString("cache", name, var));
}
@SuppressWarnings({"rawtypes", "unchecked"})
private static <K, V> CacheBuilder<K, V> newCacheBuilder() {
CacheBuilder builder = CacheBuilder.newBuilder();
return builder;
}
private static <K, V> Weigher<K, V> unitWeight() {
return new Weigher<K, V>() {
@Override
public int weigh(K key, V value) {
return 1;
}
};
}
}