| /* |
| * 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.ambari.server.agent; |
| |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| |
| import org.apache.ambari.server.HostNotRegisteredException; |
| import org.apache.ambari.server.state.Host; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.inject.Singleton; |
| |
| @Singleton |
| public class AgentSessionManager { |
| |
| private final ConcurrentMap<String, Host> registeredHosts = new ConcurrentHashMap<>(); // session ID -> host |
| private final ConcurrentMap<Long, String> registeredSessionIds = new ConcurrentHashMap<>(); |
| |
| public void register(String sessionId, Host host) { |
| Preconditions.checkNotNull(sessionId); |
| Preconditions.checkNotNull(host); |
| Preconditions.checkNotNull(host.getHostId()); |
| |
| String oldSessionId = registeredSessionIds.put(host.getHostId(), sessionId); |
| if (oldSessionId != null) { |
| registeredHosts.remove(oldSessionId); |
| } |
| registeredHosts.put(sessionId, host); |
| } |
| |
| public boolean isRegistered(String sessionId) { |
| return registeredHosts.containsKey(sessionId); |
| } |
| |
| public Host getHost(String sessionId) throws HostNotRegisteredException { |
| Preconditions.checkNotNull(sessionId); |
| |
| Host host = registeredHosts.get(sessionId); |
| if (host != null) { |
| return host; |
| } |
| |
| throw HostNotRegisteredException.forSessionId(sessionId); |
| } |
| |
| public String getSessionId(Long hostId) throws HostNotRegisteredException { |
| Preconditions.checkNotNull(hostId); |
| |
| String sessionId = registeredSessionIds.get(hostId); |
| if (sessionId != null) { |
| return sessionId; |
| } |
| |
| throw HostNotRegisteredException.forHostId(hostId); |
| } |
| |
| public void unregisterByHost(Long hostId) { |
| Preconditions.checkNotNull(hostId); |
| |
| String sessionId = registeredSessionIds.remove(hostId); |
| if (sessionId != null) { |
| registeredHosts.remove(sessionId); |
| } |
| } |
| } |