chromium/third_party/webrtc/net/dcsctp/socket/callback_deferrer.h

/*
 *  Copyright (c) 2021 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 NET_DCSCTP_SOCKET_CALLBACK_DEFERRER_H_
#define NET_DCSCTP_SOCKET_CALLBACK_DEFERRER_H_

#include <cstdint>
#include <functional>
#include <memory>
#include <string>
#include <utility>
#include <vector>

#include "absl/strings/string_view.h"
#include "absl/types/variant.h"
#include "api/array_view.h"
#include "api/ref_counted_base.h"
#include "api/scoped_refptr.h"
#include "api/task_queue/task_queue_base.h"
#include "net/dcsctp/public/dcsctp_message.h"
#include "net/dcsctp/public/dcsctp_socket.h"

namespace dcsctp {
// Defers callbacks until they can be safely triggered.
//
// There are a lot of callbacks from the dcSCTP library to the client,
// such as when messages are received or streams are closed. When the client
// receives these callbacks, the client is expected to be able to call into the
// library - from within the callback. For example, sending a reply message when
// a certain SCTP message has been received, or to reconnect when the connection
// was closed for any reason. This means that the dcSCTP library must always be
// in a consistent and stable state when these callbacks are delivered, and to
// ensure that's the case, callbacks are not immediately delivered from where
// they originate, but instead queued (deferred) by this class. At the end of
// any public API method that may result in callbacks, they are triggered and
// then delivered.
//
// There are a number of exceptions, which is clearly annotated in the API.
class CallbackDeferrer : public DcSctpSocketCallbacks { … };
}  // namespace dcsctp

#endif  // NET_DCSCTP_SOCKET_CALLBACK_DEFERRER_H_