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//
// Copyright Aliaksei Levin (levlam@telegram.org), Arseny Smirnov (arseny30@gmail.com) 2014-2024
//
// 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/utils/Closure.h"
#include "td/utils/common.h"
#include "td/utils/StringBuilder.h"
#include <type_traits>
#include <utility>
namespace td {
class Actor;
// Events
//
// Small structure (up to 16 bytes) used to send events between actors.
//
// There are some predefined types of events:
// NoType -- unitialized event
// Start -- start actor
// Stop -- stop actor
// Yield -- wake up actor
// Timeout -- some timeout has expired
// Hangup -- hang up called
// Raw -- just pass 8 bytes (union Raw is used for convenience)
// Custom -- Send CustomEvent
template <class T>
std::enable_if_t<!std::is_base_of<Actor, T>::value> start_migrate(T &obj, int32 sched_id) {
}
template <class T>
std::enable_if_t<!std::is_base_of<Actor, T>::value> finish_migrate(T &obj) {
}
class CustomEvent {
public:
CustomEvent() = default;
CustomEvent(const CustomEvent &) = delete;
CustomEvent &operator=(const CustomEvent &) = delete;
CustomEvent(CustomEvent &&) = delete;
CustomEvent &operator=(CustomEvent &&) = delete;
virtual ~CustomEvent() = default;
virtual void run(Actor *actor) = 0;
virtual void start_migrate(int32 sched_id) {
}
virtual void finish_migrate() {
}
};
template <class ClosureT>
class ClosureEvent final : public CustomEvent {
public:
void run(Actor *actor) final {
closure_.run(static_cast<typename ClosureT::ActorType *>(actor));
}
template <class... ArgsT>
explicit ClosureEvent(ArgsT &&...args) : closure_(std::forward<ArgsT>(args)...) {
}
void start_migrate(int32 sched_id) final {
closure_.for_each([sched_id](auto &obj) {
using ::td::start_migrate;
start_migrate(obj, sched_id);
});
}
void finish_migrate() final {
closure_.for_each([](auto &obj) {
using ::td::finish_migrate;
finish_migrate(obj);
});
}
private:
ClosureT closure_;
};
template <class LambdaT>
class LambdaEvent final : public CustomEvent {
public:
void run(Actor *actor) final {
f_();
}
template <class FromLambdaT, std::enable_if_t<!std::is_same<std::decay_t<FromLambdaT>, LambdaEvent>::value, int> = 0>
explicit LambdaEvent(FromLambdaT &&func) : f_(std::forward<FromLambdaT>(func)) {
}
private:
LambdaT f_;
};
class Event {
public:
enum class Type { NoType, Start, Stop, Yield, Timeout, Hangup, Raw, Custom };
Type type;
uint64 link_token = 0;
union Raw {
void *ptr;
CustomEvent *custom_event;
uint32 u32;
uint64 u64;
} data{};
// factory functions
static Event start() {
return Event(Type::Start);
}
static Event stop() {
return Event(Type::Stop);
}
static Event yield() {
return Event(Type::Yield);
}
static Event timeout() {
return Event(Type::Timeout);
}
static Event hangup() {
return Event(Type::Hangup);
}
static Event raw(void *ptr) {
return Event(Type::Raw, ptr);
}
static Event raw(uint32 u32) {
return Event(Type::Raw, u32);
}
static Event raw(uint64 u64) {
return Event(Type::Raw, u64);
}
static Event custom(CustomEvent *custom_event) {
return Event(Type::Custom, custom_event);
}
template <class FromImmediateClosureT>
static Event immediate_closure(FromImmediateClosureT &&closure) {
return custom(
new ClosureEvent<typename FromImmediateClosureT::Delayed>(std::forward<FromImmediateClosureT>(closure)));
}
template <class... ArgsT>
static Event delayed_closure(ArgsT &&...args) {
using DelayedClosureT = decltype(create_delayed_closure(std::forward<ArgsT>(args)...));
return custom(new ClosureEvent<DelayedClosureT>(std::forward<ArgsT>(args)...));
}
template <class FromLambdaT>
static Event from_lambda(FromLambdaT &&func) {
return custom(new LambdaEvent<std::decay_t<FromLambdaT>>(std::forward<FromLambdaT>(func)));
}
Event() : Event(Type::NoType) {
}
Event(const Event &) = delete;
Event &operator=(const Event &) = delete;
Event(Event &&other) noexcept : type(other.type), link_token(other.link_token), data(other.data) {
other.type = Type::NoType;
}
Event &operator=(Event &&other) noexcept {
destroy();
type = other.type;
link_token = other.link_token;
data = other.data;
other.type = Type::NoType;
return *this;
}
~Event() {
destroy();
}
bool empty() const {
return type == Type::NoType;
}
void clear() {
destroy();
type = Type::NoType;
}
Event &set_link_token(uint64 new_link_token) {
link_token = new_link_token;
return *this;
}
friend void start_migrate(Event &obj, int32 sched_id) {
if (obj.type == Type::Custom) {
obj.data.custom_event->start_migrate(sched_id);
}
}
friend void finish_migrate(Event &obj) {
if (obj.type == Type::Custom) {
obj.data.custom_event->finish_migrate();
}
}
private:
explicit Event(Type type) : type(type) {
}
Event(Type type, void *ptr) : Event(type) {
data.ptr = ptr;
}
Event(Type type, CustomEvent *custom_event) : Event(type) {
data.custom_event = custom_event;
}
Event(Type type, uint32 u32) : Event(type) {
data.u32 = u32;
}
Event(Type type, uint64 u64) : Event(type) {
data.u64 = u64;
}
void destroy() {
if (type == Type::Custom) {
delete data.custom_event;
}
}
};
inline StringBuilder &operator<<(StringBuilder &string_builder, const Event &e) {
string_builder << "Event::";
switch (e.type) {
case Event::Type::Start:
return string_builder << "Start";
case Event::Type::Stop:
return string_builder << "Stop";
case Event::Type::Yield:
return string_builder << "Yield";
case Event::Type::Hangup:
return string_builder << "Hangup";
case Event::Type::Timeout:
return string_builder << "Timeout";
case Event::Type::Raw:
return string_builder << "Raw";
case Event::Type::Custom:
return string_builder << "Custom";
case Event::Type::NoType:
default:
return string_builder << "NoType";
}
}
} // namespace td
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