| /** |
| * 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.client.resolver; |
| |
| import java.net.InetSocketAddress; |
| import java.net.SocketAddress; |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| /** |
| * Default implementation of {@link RegionResolver}. |
| */ |
| public class DefaultRegionResolver implements RegionResolver { |
| |
| private static final String DEFAULT_REGION = "default-region"; |
| |
| private final Map<SocketAddress, String> regionOverrides = |
| new HashMap<SocketAddress, String>(); |
| private final ConcurrentMap<SocketAddress, String> regionMap = |
| new ConcurrentHashMap<SocketAddress, String>(); |
| |
| public DefaultRegionResolver() { |
| } |
| |
| public DefaultRegionResolver(Map<SocketAddress, String> regionOverrides) { |
| this.regionOverrides.putAll(regionOverrides); |
| } |
| |
| @Override |
| public String resolveRegion(SocketAddress address) { |
| String region = regionMap.get(address); |
| if (null == region) { |
| region = doResolveRegion(address); |
| regionMap.put(address, region); |
| } |
| return region; |
| } |
| |
| private String doResolveRegion(SocketAddress address) { |
| String region = regionOverrides.get(address); |
| if (null != region) { |
| return region; |
| } |
| |
| String domainName; |
| if (address instanceof InetSocketAddress) { |
| InetSocketAddress iAddr = (InetSocketAddress) address; |
| domainName = iAddr.getHostName(); |
| } else { |
| domainName = address.toString(); |
| } |
| String[] parts = domainName.split("\\."); |
| if (parts.length <= 0) { |
| return DEFAULT_REGION; |
| } |
| String hostName = parts[0]; |
| String[] labels = hostName.split("-"); |
| if (labels.length != 4) { |
| return DEFAULT_REGION; |
| } |
| return labels[0]; |
| } |
| |
| @Override |
| public void removeCachedHost(SocketAddress address) { |
| regionMap.remove(address); |
| } |
| } |