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// Copyright (c) 2011 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_
#include <deque>
#include <string>
#include "base/hash_tables.h"
#include "net/base/net_export.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 NET_EXPORT_PRIVATE 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_
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