| /** |
| * 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.atlas.ha; |
| |
| import org.apache.atlas.AtlasConstants; |
| import org.apache.atlas.AtlasException; |
| import org.apache.commons.configuration.Configuration; |
| import org.apache.commons.lang.StringUtils; |
| import org.apache.hadoop.net.NetUtils; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.net.InetSocketAddress; |
| |
| public class AtlasServerIdSelector { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(AtlasServerIdSelector.class); |
| |
| /** |
| * Return the ID corresponding to this Atlas instance. |
| * |
| * The match is done by looking for an ID configured in {@link HAConfiguration#ATLAS_SERVER_IDS} key |
| * that has a host:port entry for the key {@link HAConfiguration#ATLAS_SERVER_ADDRESS_PREFIX}+ID where |
| * the host is a local IP address and port is set in the system property |
| * {@link AtlasConstants#SYSTEM_PROPERTY_APP_PORT}. |
| * |
| * @param configuration |
| * @return |
| * @throws AtlasException if no ID is found that maps to a local IP Address or port |
| */ |
| public static String selectServerId(Configuration configuration) throws AtlasException { |
| // ids are already trimmed by this method |
| String[] ids = configuration.getStringArray(HAConfiguration.ATLAS_SERVER_IDS); |
| String matchingServerId = null; |
| int appPort = Integer.parseInt(System.getProperty(AtlasConstants.SYSTEM_PROPERTY_APP_PORT)); |
| for (String id : ids) { |
| String hostPort = configuration.getString(HAConfiguration.ATLAS_SERVER_ADDRESS_PREFIX +id); |
| if (!StringUtils.isEmpty(hostPort)) { |
| InetSocketAddress socketAddress; |
| try { |
| socketAddress = NetUtils.createSocketAddr(hostPort); |
| } catch (Exception e) { |
| LOG.warn("Exception while trying to get socket address for {}", hostPort, e); |
| continue; |
| } |
| if (!socketAddress.isUnresolved() |
| && NetUtils.isLocalAddress(socketAddress.getAddress()) |
| && appPort == socketAddress.getPort()) { |
| LOG.info("Found matched server id {} with host port: {}", id, hostPort); |
| matchingServerId = id; |
| break; |
| } |
| } else { |
| LOG.info("Could not find matching address entry for id: {}", id); |
| } |
| } |
| if (matchingServerId == null) { |
| String msg = String.format("Could not find server id for this instance. " + |
| "Unable to find IDs matching any local host and port binding among %s", |
| StringUtils.join(ids, ",")); |
| throw new AtlasException(msg); |
| } |
| return matchingServerId; |
| } |
| |
| } |