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/* -*- 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 transportlayer_h__
#define transportlayer_h__
#include "sigslot.h"
#include "nsCOMPtr.h"
#include "nsIEventTarget.h"
#include "m_cpp_utils.h"
#include "mediapacket.h"
namespace mozilla {
class TransportFlow;
typedef int TransportResult;
enum { TE_WOULDBLOCK = -1, TE_ERROR = -2, TE_INTERNAL = -3 };
#define TRANSPORT_LAYER_ID(name) \
const std::string id() const override { return name; } \
static std::string ID() { return name; }
// Abstract base class for network transport layers.
class TransportLayer : public sigslot::has_slots<> {
public:
// The state of the transport flow
// We can't use "ERROR" because Windows has a macro named "ERROR"
enum State { TS_NONE, TS_INIT, TS_CONNECTING, TS_OPEN, TS_CLOSED, TS_ERROR };
// Is this a stream or datagram flow
TransportLayer() : state_(TS_NONE), flow_id_(), downward_(nullptr) {}
virtual ~TransportLayer() = default;
// Called to initialize
nsresult Init(); // Called by Insert() to set up -- do not override
virtual nsresult InitInternal() { return NS_OK; } // Called by Init
void SetFlowId(const std::string& flow_id) { flow_id_ = flow_id; }
virtual void Chain(TransportLayer* downward);
// Downward interface
TransportLayer* downward() { return downward_; }
// Get the state
State state() const { return state_; }
// Must be implemented by derived classes
virtual TransportResult SendPacket(MediaPacket& packet) = 0;
// Get the thread.
const nsCOMPtr<nsIEventTarget> GetThread() const { return target_; }
// Event definitions that one can register for
// State has changed
sigslot::signal2<TransportLayer*, State> SignalStateChange;
// Data received on the flow
sigslot::signal2<TransportLayer*, MediaPacket&> SignalPacketReceived;
// Return the layer id for this layer
virtual const std::string id() const = 0;
// The id of the flow
const std::string& flow_id() const { return flow_id_; }
protected:
virtual void WasInserted() {}
virtual void SetState(State state, const char* file, unsigned line);
// Check if we are on the right thread
void CheckThread() const { MOZ_ASSERT(CheckThreadInt(), "Wrong thread"); }
State state_;
std::string flow_id_;
TransportLayer* downward_; // The next layer in the stack
nsCOMPtr<nsIEventTarget> target_;
private:
DISALLOW_COPY_ASSIGN(TransportLayer);
bool CheckThreadInt() const {
bool on;
if (!target_) // OK if no thread set.
return true;
NS_ENSURE_SUCCESS(target_->IsOnCurrentThread(&on), false);
NS_ENSURE_TRUE(on, false);
return true;
}
};
#define LAYER_INFO \
"Flow[" << flow_id() << "(none)" \
<< "]; Layer[" << id() << "]: "
#define TL_SET_STATE(x) SetState((x), __FILE__, __LINE__)
} // namespace mozilla
#endif
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