gecko-dev/media/mtransport/transportflow.h

87 lines
2.6 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
// Original author: ekr@rtfm.com
#ifndef transportflow_h__
#define transportflow_h__
#include <deque>
#include <queue>
#include <string>
#include "nscore.h"
#include "nsISupportsImpl.h"
#include "transportlayer.h"
#include "m_cpp_utils.h"
// A stack of transport layers acts as a flow.
// Generally, one reads and writes to the top layer.
namespace mozilla {
class TransportFlow : public sigslot::has_slots<> {
public:
TransportFlow()
: id_("(anonymous)"),
state_(TransportLayer::TS_NONE) {}
TransportFlow(const std::string id)
: id_(id),
state_(TransportLayer::TS_NONE) {}
~TransportFlow();
const std::string& id() const { return id_; }
// Layer management. Note PushLayer() is not thread protected, so
// either:
// (a) Do it in the thread handling the I/O
// (b) Do it before you activate the I/O system
//
// The flow takes ownership of the layers after a successful
// push.
nsresult PushLayer(TransportLayer *layer);
// Convenience function to push multiple layers on. Layers
// are pushed on in the order that they are in the queue.
// Any failures cause the flow to become inoperable and
// destroys all the layers including those already pushed.
// TODO(ekr@rtfm.com): Change layers to be ref-counted.
nsresult PushLayers(nsAutoPtr<std::queue<TransportLayer *> > layers);
TransportLayer *top() const;
TransportLayer *GetLayer(const std::string& id) const;
// Wrappers for whatever TLayer happens to be the top layer
// at the time. This way you don't need to do top()->Foo().
TransportLayer::State state(); // Current state
TransportResult SendPacket(const unsigned char *data, size_t len);
// State has changed. Reflects the top flow.
sigslot::signal2<TransportFlow *, TransportLayer::State>
SignalStateChange;
// Data received on the flow
sigslot::signal3<TransportFlow*, const unsigned char *, size_t>
SignalPacketReceived;
NS_INLINE_DECL_THREADSAFE_REFCOUNTING(TransportFlow)
private:
DISALLOW_COPY_ASSIGN(TransportFlow);
void StateChange(TransportLayer *layer, TransportLayer::State state);
void StateChangeInt(TransportLayer::State state);
void PacketReceived(TransportLayer* layer, const unsigned char *data,
size_t len);
std::string id_;
std::deque<TransportLayer *> layers_;
TransportLayer::State state_;
};
} // close namespace
#endif