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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 <map>
#include <set>
#include <string>
#include "net/base/ip_endpoint.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.
//
// Returns true if successful. If the number of pending jobs will exceed
// the limit, does nothing and returns false.
bool PutInQueue(WebSocketJob* job);
// Removes |job| from |queue_| and queues for the destination addresses
// of |job|, and then wakes up jobs that can now resume establishing a
// connection.
void RemoveFromQueue(WebSocketJob* job);
private:
typedef std::deque<WebSocketJob*> ConnectingQueue;
typedef std::map<IPEndPoint, ConnectingQueue> ConnectingAddressMap;
WebSocketThrottle();
~WebSocketThrottle();
friend struct DefaultSingletonTraits<WebSocketThrottle>;
// Examines if any of the given jobs can resume establishing a connection. If
// for all per-address queues for each resolved addresses
// (job->address_list()) of a job, the job is at the front of the queues, the
// job can resume establishing a connection, so wakes up the job.
void WakeupSocketIfNecessary(
const std::set<WebSocketJob*>& wakeup_candidates);
// 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_;
DISALLOW_COPY_AND_ASSIGN(WebSocketThrottle);
};
} // namespace net
#endif // NET_WEBSOCKETS_WEBSOCKET_THROTTLE_H_
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