chromium/third_party/webrtc/p2p/base/regathering_controller.h

/*
 *  Copyright 2018 The WebRTC Project Authors. All rights reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef P2P_BASE_REGATHERING_CONTROLLER_H_
#define P2P_BASE_REGATHERING_CONTROLLER_H_

#include <memory>

#include "api/task_queue/pending_task_safety_flag.h"
#include "p2p/base/ice_transport_internal.h"
#include "p2p/base/port_allocator.h"
#include "rtc_base/thread.h"

namespace webrtc {

// Controls regathering of candidates for the ICE transport passed into it,
// reacting to signals like SignalWritableState, SignalNetworkRouteChange, etc.,
// using methods like GetStats to get additional information, and calling
// methods like RegatherOnFailedNetworks on the PortAllocatorSession when
// regathering is desired.
//
// "Regathering" is defined as gathering additional candidates within a single
// ICE generation (or in other words, PortAllocatorSession), and is possible
// when "continual gathering" is enabled. This may allow connectivity to be
// maintained and/or restored without a full ICE restart.
//
// Regathering will only begin after PortAllocationSession is set via
// set_allocator_session. This should be called any time the "active"
// PortAllocatorSession is changed (in other words, when an ICE restart occurs),
// so that candidates are gathered for the "current" ICE generation.
//
// All methods of BasicRegatheringController should be called on the same
// thread as the one passed to the constructor, and this thread should be the
// same one where PortAllocatorSession runs, which is also identical to the
// network thread of the ICE transport, as given by
// P2PTransportChannel::thread().
class BasicRegatheringController : public sigslot::has_slots<> { … };

}  // namespace webrtc

#endif  // P2P_BASE_REGATHERING_CONTROLLER_H_