// Copyright (c) 2009 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef NET_WEBSOCKETS_WEBSOCKET_THROTTLE_H_ #define NET_WEBSOCKETS_WEBSOCKET_THROTTLE_H_ #pragma once #include <deque> #include <string> #include "base/hash_tables.h" template <typename T> struct DefaultSingletonTraits; namespace net { class SocketStream; class WebSocketJob; // SocketStreamThrottle for WebSocket protocol. // Implements the client-side requirements in the spec. // http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol // 4.1 Handshake // 1. If the user agent already has a Web Socket connection to the // remote host (IP address) identified by /host/, even if known by // another name, wait until that connection has been established or // for that connection to have failed. class WebSocketThrottle { public: // Returns the singleton instance. static WebSocketThrottle* GetInstance(); // Puts |job| in |queue_| and queues for the destination addresses // of |job|. // If other job is using the same destination address, set |job| waiting. void PutInQueue(WebSocketJob* job); // Removes |job| from |queue_| and queues for the destination addresses // of |job|. void RemoveFromQueue(WebSocketJob* job); // Checks sockets waiting in |queue_| and check the socket is the front of // every queue for the destination addresses of |socket|. // If so, the socket can resume estabilshing connection, so wake up // the socket. void WakeupSocketIfNecessary(); private: typedef std::deque<WebSocketJob*> ConnectingQueue; typedef base::hash_map<std::string, ConnectingQueue*> ConnectingAddressMap; WebSocketThrottle(); virtual ~WebSocketThrottle(); friend struct DefaultSingletonTraits<WebSocketThrottle>; // Key: string of host's address. Value: queue of sockets for the address. ConnectingAddressMap addr_map_; // Queue of sockets for websockets in opening state. ConnectingQueue queue_; }; } // namespace net #endif // NET_WEBSOCKETS_WEBSOCKET_THROTTLE_H_