| /** |
| * 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.curator.framework.imps; |
| |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| |
| class NamespaceFacadeCache |
| { |
| private final CuratorFrameworkImpl client; |
| private final NamespaceFacade nullNamespace; |
| private final CacheLoader<String, NamespaceFacade> loader = new CacheLoader<String, NamespaceFacade>() |
| { |
| @Override |
| public NamespaceFacade load(String namespace) throws Exception |
| { |
| return new NamespaceFacade(client, namespace); |
| } |
| }; |
| private final LoadingCache<String, NamespaceFacade> cache = CacheBuilder.newBuilder() |
| .expireAfterAccess(5, TimeUnit.MINUTES) // does this need config? probably not |
| .build(loader); |
| |
| NamespaceFacadeCache(CuratorFrameworkImpl client) |
| { |
| this.client = client; |
| nullNamespace = new NamespaceFacade(client, null); |
| } |
| |
| NamespaceFacade get(String namespace) |
| { |
| try |
| { |
| return (namespace != null) ? cache.get(namespace) : nullNamespace; |
| } |
| catch ( ExecutionException e ) |
| { |
| throw new RuntimeException(e); // should never happen |
| } |
| } |
| } |