| /* |
| * 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.cassandra.thrift; |
| |
| import java.net.InetSocketAddress; |
| import java.net.SocketAddress; |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Encapsulates the current client state (session). |
| * |
| * We rely on the Thrift server to tell us what socket it is |
| * executing a request for via setCurrentSocket, after which currentSession can do its job anywhere. |
| */ |
| public class ThriftSessionManager |
| { |
| private static final Logger logger = LoggerFactory.getLogger(ThriftSessionManager.class); |
| public final static ThriftSessionManager instance = new ThriftSessionManager(); |
| |
| private final ThreadLocal<SocketAddress> remoteSocket = new ThreadLocal<>(); |
| private final ConcurrentHashMap<SocketAddress, ThriftClientState> activeSocketSessions = new ConcurrentHashMap<>(); |
| |
| /** |
| * @param socket the address on which the current thread will work on requests for until further notice |
| */ |
| public void setCurrentSocket(SocketAddress socket) |
| { |
| remoteSocket.set(socket); |
| } |
| |
| /** |
| * @return the current session for the most recently given socket on this thread |
| */ |
| public ThriftClientState currentSession() |
| { |
| SocketAddress socket = remoteSocket.get(); |
| assert socket != null; |
| |
| ThriftClientState cState = activeSocketSessions.get(socket); |
| if (cState == null) |
| { |
| //guarantee atomicity |
| ThriftClientState newState = new ThriftClientState((InetSocketAddress)socket); |
| cState = activeSocketSessions.putIfAbsent(socket, newState); |
| if (cState == null) |
| cState = newState; |
| } |
| return cState; |
| } |
| |
| /** |
| * The connection associated with @param socket is permanently finished. |
| */ |
| public void connectionComplete(SocketAddress socket) |
| { |
| assert socket != null; |
| activeSocketSessions.remove(socket); |
| if (logger.isTraceEnabled()) |
| logger.trace("ClientState removed for socket addr {}", socket); |
| } |
| |
| public int getConnectedClients() |
| { |
| return activeSocketSessions.size(); |
| } |
| } |