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/*
* libjingle
* Copyright 2004--2005, Google Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _CRICKET_P2P_BASE_TRANSPORTCHANNEL_H_
#define _CRICKET_P2P_BASE_TRANSPORTCHANNEL_H_
#include <string>
#include "talk/base/basictypes.h"
#include "talk/base/sigslot.h"
#include "talk/base/socket.h"
namespace cricket {
// A TransportChannel represents one logical stream of packets that are sent
// between the two sides of a session.
class TransportChannel: public sigslot::has_slots<> {
public:
TransportChannel(const std::string& name, const std::string &session_type)
: name_(name), session_type_(session_type), readable_(false), writable_(false) {}
virtual ~TransportChannel() {}
// Returns the name of this channel.
const std::string& name() const { return name_; }
const std::string& session_type() const { return session_type_; }
// Returns the readable and states of this channel. Each time one of these
// states changes, a signal is raised. These states are aggregated by the
// TransportManager.
bool readable() const { return readable_; }
bool writable() const { return writable_; }
sigslot::signal1<TransportChannel*> SignalReadableState;
sigslot::signal1<TransportChannel*> SignalWritableState;
// Attempts to send the given packet. The return value is < 0 on failure.
virtual int SendPacket(const char *data, size_t len) = 0;
// Sets a socket option on this channel. Note that not all options are
// supported by all transport types.
virtual int SetOption(talk_base::Socket::Option opt, int value) = 0;
// Returns the most recent error that occurred on this channel.
virtual int GetError() = 0;
// Signalled each time a packet is received on this channel.
sigslot::signal3<TransportChannel*, const char*, size_t> SignalReadPacket;
// This signal occurs when there is a change in the way that packets are
// being routed. The address indicates the address of the first hop in the
// new route, if this is known. If this cannot be determined or is not well-
// defined, then the channel may give an address of 0.
sigslot::signal2<TransportChannel*, const talk_base::SocketAddress&>
SignalRouteChange;
// Invoked when the channel is being destroyed.
sigslot::signal1<TransportChannel*> SignalDestroyed;
// TODO: Generalize network monitoring.
// Debugging description of this transport channel.
std::string ToString() const;
protected:
// Sets the readable state, signaling if necessary.
void set_readable(bool readable);
// Sets the writable state, signaling if necessary.
void set_writable(bool writable);
private:
std::string name_;
std::string session_type_;
bool readable_;
bool writable_;
DISALLOW_EVIL_CONSTRUCTORS(TransportChannel);
};
} // namespace cricket
#endif // _CRICKET_P2P_BASE_TRANSPORTCHANNEL_H_
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