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// 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 com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
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.time.Duration;
class CacheProvider<K, V> implements Provider<Cache<K, V>>, CacheBinding<K, V>, CacheDef<K, V> {
private final CacheModule module;
final String name;
private final TypeLiteral<K> keyType;
private final TypeLiteral<V> valType;
private String configKey;
private long maximumWeight;
private Duration expireAfterWrite;
private Duration expireFromMemoryAfterAccess;
private Provider<CacheLoader<K, V>> loader;
private Provider<Weigher<K, V>> weigher;
private String plugin;
private MemoryCacheFactory memoryCacheFactory;
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;
}
@Override
public CacheBinding<K, V> maximumWeight(long weight) {
checkNotFrozen();
maximumWeight = weight;
return this;
}
@Override
public CacheBinding<K, V> expireAfterWrite(Duration duration) {
checkNotFrozen();
expireAfterWrite = duration;
return this;
}
@Override
public CacheBinding<K, V> expireFromMemoryAfterAccess(Duration duration) {
checkNotFrozen();
expireFromMemoryAfterAccess = duration;
return this;
}
@Override
public CacheBinding<K, V> loader(Class<? extends CacheLoader<K, V>> impl) {
checkNotFrozen();
loader = module.bindCacheLoader(this, impl);
return this;
}
@Override
public CacheBinding<K, V> weigher(Class<? extends Weigher<K, V>> impl) {
checkNotFrozen();
weigher = module.bindWeigher(this, impl);
return this;
}
@Override
public CacheBinding<K, V> configKey(String name) {
checkNotFrozen();
configKey = requireNonNull(name);
return this;
}
@Override
public String name() {
if (!Strings.isNullOrEmpty(plugin)) {
return plugin + "." + name;
}
return name;
}
@Override
public String configKey() {
return configKey != null ? configKey : name();
}
@Override
public TypeLiteral<K> keyType() {
return keyType;
}
@Override
public TypeLiteral<V> valueType() {
return valType;
}
@Override
public long maximumWeight() {
return maximumWeight;
}
@Override
@Nullable
public Duration expireAfterWrite() {
return expireAfterWrite;
}
@Override
@Nullable
public Duration expireFromMemoryAfterAccess() {
return expireFromMemoryAfterAccess;
}
@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() {
freeze();
CacheLoader<K, V> ldr = loader();
return ldr != null ? memoryCacheFactory.build(this, ldr) : memoryCacheFactory.build(this);
}
protected void checkNotFrozen() {
checkState(!frozen, "binding frozen, cannot be modified");
}
protected void freeze() {
frozen = true;
}
}
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