| // Copyright (C) 2021 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.googlesource.gerrit.modules.cache.chroniclemap; |
| |
| import com.google.common.cache.CacheStats; |
| import com.google.common.cache.LoadingCache; |
| import com.google.gerrit.common.Nullable; |
| import java.util.concurrent.Callable; |
| import java.util.concurrent.ExecutionException; |
| |
| class InMemoryCacheLoadingFromStoreImpl<K, V> implements InMemoryCache<K, V> { |
| private final LoadingCache<K, TimedValue<V>> loadingFromStoreCache; |
| private final boolean loadingFromSource; |
| |
| /** |
| * Creates an in-memory cache backed by a LoadingCache linked to loader from ChronicleMap. |
| * |
| * @param loadingFromStoreCache LoadingCache linked to loader from ChronicleMap |
| * @param loadingFromSource true if the loadingFromStoreCache is also loading from the data source |
| */ |
| InMemoryCacheLoadingFromStoreImpl( |
| LoadingCache<K, TimedValue<V>> loadingFromStoreCache, boolean loadingFromSource) { |
| this.loadingFromStoreCache = loadingFromStoreCache; |
| this.loadingFromSource = loadingFromSource; |
| } |
| |
| @Override |
| public @Nullable TimedValue<V> getIfPresent(Object key) { |
| return loadingFromStoreCache.getIfPresent(key); |
| } |
| |
| @Override |
| public TimedValue<V> get(K key, Callable<? extends TimedValue<V>> valueLoader) throws Exception { |
| return loadingFromStoreCache.get(key, valueLoader); |
| } |
| |
| @Override |
| public void put(K key, TimedValue<V> value) { |
| loadingFromStoreCache.put(key, value); |
| } |
| |
| @Override |
| public boolean isLoadingCache() { |
| return loadingFromSource; |
| } |
| |
| @Override |
| public TimedValue<V> get(K key) throws ExecutionException { |
| TimedValue<V> cachedValue = getIfPresent(key); |
| if (cachedValue != null) { |
| return cachedValue; |
| } |
| |
| if (loadingFromSource) { |
| return loadingFromStoreCache.get(key); |
| } |
| |
| throw new UnsupportedOperationException( |
| String.format("Could not load value for %s without any loader", key)); |
| } |
| |
| @Override |
| public void refresh(K key) { |
| if (loadingFromSource) { |
| loadingFromStoreCache.refresh(key); |
| } |
| } |
| |
| @Override |
| public CacheStats stats() { |
| return loadingFromStoreCache.stats(); |
| } |
| |
| @Override |
| public long size() { |
| return loadingFromStoreCache.size(); |
| } |
| |
| @Override |
| public void invalidate(Object key) { |
| loadingFromStoreCache.invalidate(key); |
| } |
| |
| @Override |
| public void invalidateAll() { |
| loadingFromStoreCache.invalidateAll(); |
| } |
| } |