| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.drill.exec.store.sys.store.provider; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.apache.drill.exec.store.sys.VersionedPersistentStore; |
| import org.apache.drill.common.AutoCloseables; |
| import org.apache.drill.exec.exception.StoreException; |
| import org.apache.drill.exec.store.sys.PersistentStore; |
| import org.apache.drill.exec.store.sys.PersistentStoreConfig; |
| import org.apache.drill.exec.store.sys.PersistentStoreProvider; |
| import org.apache.drill.common.util.function.CheckedFunction; |
| |
| public class CachingPersistentStoreProvider extends BasePersistentStoreProvider { |
| |
| private final Map<PersistentStoreConfig<?>, PersistentStore<?>> storeCache = new ConcurrentHashMap<>(); |
| private final Map<PersistentStoreConfig<?>, VersionedPersistentStore<?>> versionedStoreCache = new ConcurrentHashMap<>(); |
| private final PersistentStoreProvider provider; |
| |
| public CachingPersistentStoreProvider(PersistentStoreProvider provider) { |
| this.provider = provider; |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public <V> PersistentStore<V> getOrCreateStore(final PersistentStoreConfig<V> config) throws StoreException { |
| CheckedFunction<PersistentStoreConfig<?>, PersistentStore<?>, StoreException> function = provider::getOrCreateStore; |
| return (PersistentStore<V>) storeCache.computeIfAbsent(config, function); |
| } |
| |
| @Override |
| @SuppressWarnings("unchecked") |
| public <V> VersionedPersistentStore<V> getOrCreateVersionedStore(PersistentStoreConfig<V> config) throws StoreException { |
| CheckedFunction<PersistentStoreConfig<?>, VersionedPersistentStore<?>, StoreException> function = provider::getOrCreateVersionedStore; |
| return (VersionedPersistentStore<V>) versionedStoreCache.computeIfAbsent(config, function); |
| } |
| |
| @Override |
| public void start() throws Exception { |
| provider.start(); |
| } |
| |
| @Override |
| public void close() throws Exception { |
| List<AutoCloseable> closeables = new ArrayList<>(); |
| |
| // add un-versioned stores |
| closeables.addAll(storeCache.values()); |
| storeCache.clear(); |
| |
| // add versioned stores |
| closeables.addAll(versionedStoreCache.values()); |
| versionedStoreCache.clear(); |
| |
| // add provider |
| closeables.add(provider); |
| |
| AutoCloseables.close(closeables); |
| } |
| |
| } |