| /** |
| * 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 com.twitter.distributedlog.config; |
| |
| import com.google.common.base.Preconditions; |
| |
| import org.apache.commons.configuration.AbstractConfiguration; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.util.Iterator; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * Configuration view built on concurrent hash map for fast thread-safe access. |
| * Notes: |
| * 1. Multi-property list aggregation will not work in this class. I.e. commons config |
| * normally combines all properties with the same key into one list property automatically. |
| * This class simply overwrites any existing mapping. |
| */ |
| public class ConcurrentBaseConfiguration extends AbstractConfiguration { |
| static final Logger LOG = LoggerFactory.getLogger(ConcurrentBaseConfiguration.class); |
| |
| private final ConcurrentHashMap<String, Object> map; |
| |
| public ConcurrentBaseConfiguration() { |
| this.map = new ConcurrentHashMap<String, Object>(); |
| } |
| |
| @Override |
| protected void addPropertyDirect(String key, Object value) { |
| Preconditions.checkNotNull(value); |
| map.put(key, value); |
| } |
| |
| @Override |
| public Object getProperty(String key) { |
| return map.get(key); |
| } |
| |
| @Override |
| public Iterator getKeys() { |
| return map.keySet().iterator(); |
| } |
| |
| @Override |
| public boolean containsKey(String key) { |
| return map.containsKey(key); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return map.isEmpty(); |
| } |
| |
| @Override |
| protected void clearPropertyDirect(String key) { |
| map.remove(key); |
| } |
| } |