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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2026
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#pragma once
#include "td/telegram/net/NetQuery.h"
#include "td/actor/actor.h"
#include "td/utils/common.h"
#include "td/utils/FlatHashMap.h"
#include "td/utils/Random.h"
#include "td/utils/Slice.h"
#include <limits>
namespace td {
class SequenceDispatcher final : public NetQueryCallback {
public:
class Parent : public Actor {
public:
virtual void ready_to_close() = 0;
virtual void on_result() = 0;
};
SequenceDispatcher() = default;
explicit SequenceDispatcher(ActorShared<Parent> parent) : parent_(std::move(parent)) {
}
void send_with_callback(NetQueryPtr query, ActorShared<NetQueryCallback> callback);
void on_result(NetQueryPtr query) final;
void close_silent();
private:
enum class State : int32 { Start, Wait, Finish, Dummy };
struct Data {
State state_;
NetQueryRef net_query_ref_;
NetQueryPtr query_;
ActorShared<NetQueryCallback> callback_;
uint64 generation_;
int32 total_timeout_;
int32 last_timeout_;
};
ActorShared<Parent> parent_;
size_t id_offset_ = 1;
vector<Data> data_;
size_t finish_i_ = 0; // skip state_ == State::Finish
size_t next_i_ = 0;
size_t last_sent_i_ = std::numeric_limits<size_t>::max();
uint64 generation_ = 1;
uint32 session_rand_ = Random::secure_int32();
static constexpr int32 MAX_SIMULTANEOUS_WAIT = 10;
uint32 wait_cnt_ = 0;
void check_timeout(Data &data);
void try_resend_query(Data &data, NetQueryPtr query);
Data &data_from_token();
void on_resend_ok(NetQueryPtr query);
void on_resend_error();
void do_resend(Data &data);
void do_finish(Data &data);
void loop() final;
void try_shrink();
void timeout_expired() final;
void hangup() final;
void tear_down() final;
};
class MultiSequenceDispatcherOld final : public SequenceDispatcher::Parent {
public:
void send(NetQueryPtr query);
static ActorOwn<MultiSequenceDispatcherOld> create(Slice name) {
return create_actor<MultiSequenceDispatcherOld>(name);
}
private:
struct Data {
int32 cnt_;
ActorOwn<SequenceDispatcher> dispatcher_;
};
FlatHashMap<uint64, Data> dispatchers_;
void on_result() final;
void ready_to_close() final;
};
class MultiSequenceDispatcher : public NetQueryCallback {
public:
virtual void send(NetQueryPtr query) = 0;
static ActorOwn<MultiSequenceDispatcher> create(Slice name);
};
} // namespace td
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