cpp.react/include/react/Domain.h at master · lineCode/cpp.react · GitHub

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// Copyright Sebastian Jeckel 2014.

// 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)

#ifndef REACT_DOMAIN_H_INCLUDED

#define REACT_DOMAIN_H_INCLUDED

#pragma once

#include "react/detail/Defs.h"

#include <memory>

#include <utility>

#include "react/detail/DomainBase.h"

#include "react/detail/ReactiveInput.h"

#include "react/detail/graph/ContinuationNodes.h"

#ifdef REACT_ENABLE_LOGGING

#include "react/logging/EventLog.h"

#include "react/logging/EventRecords.h"

#endif //REACT_ENABLE_LOGGING

/*****************************************/ REACT_BEGIN /*****************************************/

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Forward declarations

///////////////////////////////////////////////////////////////////////////////////////////////////

template <typename D, typename S>

class Signal;

template <typename D, typename S>

class VarSignal;

template <typename D, typename S, typename TOp>

class TempSignal;

template <typename D, typename E>

class Events;

template <typename D, typename E>

class EventSource;

template <typename D, typename E, typename TOp>

class TempEvents;

enum class Token;

template <typename D>

class Observer;

template <typename D>

class ScopedObserver;

template <typename D>

class Reactor;

template <typename D, typename ... TValues>

class SignalPack;

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Common types & constants

///////////////////////////////////////////////////////////////////////////////////////////////////

using REACT_IMPL::TransactionFlagsT;

// ETransactionFlags

using REACT_IMPL::ETransactionFlags;

using REACT_IMPL::allow_merging;

#ifdef REACT_ENABLE_LOGGING

using REACT_IMPL::EventLog;

#endif //REACT_ENABLE_LOGGING

// Domain modes

using REACT_IMPL::EDomainMode;

using REACT_IMPL::sequential;

using REACT_IMPL::sequential_concurrent;

using REACT_IMPL::parallel;

using REACT_IMPL::parallel_concurrent;

// Expose enum type so aliases for engines can be declared, but don't

// expose the actual enum values as they are reserved for internal use.

using REACT_IMPL::EPropagationMode;

using REACT_IMPL::WeightHint;

///////////////////////////////////////////////////////////////////////////////////////////////////

/// TransactionStatus

///////////////////////////////////////////////////////////////////////////////////////////////////

class TransactionStatus

{

using StateT = REACT_IMPL::SharedWaitingState;

using PtrT = REACT_IMPL::WaitingStatePtrT;

public:

// Default ctor

inline TransactionStatus() :

statePtr_( StateT::Create() )

{}

// Move ctor

inline TransactionStatus(TransactionStatus&& other) :

statePtr_( std::move(other.statePtr_) )

{

other.statePtr_ = StateT::Create();

}

// Move assignment

inline TransactionStatus& operator=(TransactionStatus&& other)

{

if (this != &other)

{

statePtr_ = std::move(other.statePtr_);

other.statePtr_ = StateT::Create();

}

return *this;

}

// Deleted copy ctor & assignment

TransactionStatus(const TransactionStatus&) = delete;

TransactionStatus& operator=(const TransactionStatus&) = delete;

inline void Wait()

{

assert(statePtr_.Get() != nullptr);

statePtr_->Wait();

}

private:

PtrT statePtr_;

template <typename D, typename F>

friend void AsyncTransaction(TransactionStatus& status, F&& func);

template <typename D, typename F>

friend void AsyncTransaction(TransactionFlagsT flags, TransactionStatus& status, F&& func);

};

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Continuation

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename D2 = D

class Continuation : public REACT_IMPL::ContinuationBase<D,D2>

{

private:

using NodePtrT = REACT_IMPL::NodeBasePtrT<D>;

public:

using SourceDomainT = D;

using TargetDomainT = D2;

// Default ctor

Continuation() = default;

// Move ctor

Continuation(Continuation&& other) :

Continuation::ContinuationBase( std::move(other) )

{}

// Node ctor

explicit Continuation(NodePtrT&& nodePtr) :

Continuation::ContinuationBase( std::move(nodePtr) )

{}

// Move assignment

Continuation& operator=(Continuation&& other)

{

Continuation::ContinuationBase::operator=( std::move(other) );

return *this;

}

// Deleted copy ctor & assignment

Continuation(const Continuation&) = delete;

Continuation& operator=(const Continuation&) = delete;

};

///////////////////////////////////////////////////////////////////////////////////////////////////

/// MakeContinuation - Signals

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename DOut = D,

typename S,

typename FIn

auto MakeContinuation(TransactionFlagsT flags, const Signal<D,S>& trigger, FIn&& func)

-> Continuation<D,DOut>

{

static_assert(DOut::is_concurrent,

"MakeContinuation: Target domain does not support concurrent input.");

using REACT_IMPL::SignalContinuationNode;

using F = typename std::decay<FIn>::type;

return Continuation<D,DOut>(

std::make_shared<SignalContinuationNode<D,DOut,S,F>>(

flags, GetNodePtr(trigger), std::forward<FIn>(func)));

}

template

typename D,

typename DOut = D,

typename S,

typename FIn

auto MakeContinuation(const Signal<D,S>& trigger, FIn&& func)

-> Continuation<D,DOut>

{

return MakeContinuation<D,DOut>(0, trigger, std::forward<FIn>(func));

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// MakeContinuation - Events

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename DOut = D,

typename E,

typename FIn

auto MakeContinuation(TransactionFlagsT flags, const Events<D,E>& trigger, FIn&& func)

-> Continuation<D,DOut>

{

static_assert(DOut::is_concurrent,

"MakeContinuation: Target domain does not support concurrent input.");

using REACT_IMPL::EventContinuationNode;

using REACT_IMPL::AddContinuationRangeWrapper;

using REACT_IMPL::IsCallableWith;

using REACT_IMPL::EventRange;

using F = typename std::decay<FIn>::type;

using WrapperT =

typename std::conditional<

IsCallableWith<F,void, EventRange<E>>::value,

typename std::conditional<

IsCallableWith<F, void, E>::value,

AddContinuationRangeWrapper<E, F>,

void

>::type

>::type;

static_assert(! std::is_same<WrapperT,void>::value,

"MakeContinuation: Passed function does not match any of the supported signatures.");

return Continuation<D,DOut>(

std::make_shared<EventContinuationNode<D,DOut,E,WrapperT>>(

flags, GetNodePtr(trigger), std::forward<FIn>(func)));

}

template

typename D,

typename DOut = D,

typename E,

typename FIn

auto MakeContinuation(const Events<D,E>& trigger, FIn&& func)

-> Continuation<D,DOut>

{

return MakeContinuation<D,DOut>(0, trigger, std::forward<FIn>(func));

}

///////////////////////////////////////////////////////////////////////////////////////////////////

/// MakeContinuation - Synced

///////////////////////////////////////////////////////////////////////////////////////////////////

template

typename D,

typename DOut = D,

typename E,

typename FIn,

typename ... TDepValues

auto MakeContinuation(TransactionFlagsT flags, const Events<D,E>& trigger,

const SignalPack<D,TDepValues...>& depPack, FIn&& func)

-> Continuation<D,DOut>

{

static_assert(DOut::is_concurrent,

"MakeContinuation: Target domain does not support concurrent input.");

using REACT_IMPL::SyncedContinuationNode;

using REACT_IMPL::AddContinuationRangeWrapper;

using REACT_IMPL::IsCallableWith;

using REACT_IMPL::EventRange;

using F = typename std::decay<FIn>::type;

using WrapperT =

typename std::conditional<

IsCallableWith<F, void, EventRange<E>, TDepValues ...>::value,

typename std::conditional<

IsCallableWith<F, void, E, TDepValues ...>::value,

AddContinuationRangeWrapper<E, F, TDepValues ...>,

void

>::type

>::type;

static_assert(! std::is_same<WrapperT,void>::value,

"MakeContinuation: Passed function does not match any of the supported signatures.");

struct NodeBuilder_

{

NodeBuilder_(TransactionFlagsT flags, const Events<D,E>& trigger, FIn&& func) :

MyFlags( flags ),

MyTrigger( trigger ),

MyFunc( std::forward<FIn>(func) )

{}

auto operator()(const Signal<D,TDepValues>& ... deps)

-> Continuation<D,DOut>

{

return Continuation<D,DOut>(

std::make_shared<SyncedContinuationNode<D,DOut,E,WrapperT,TDepValues...>>(

MyFlags,

GetNodePtr(MyTrigger),

std::forward<FIn>(MyFunc), GetNodePtr(deps) ...));

}

TransactionFlagsT MyFlags;

const Events<D,E>& MyTrigger;

FIn MyFunc;

};

return REACT_IMPL::apply(

NodeBuilder_( flags, trigger, std::forward<FIn>(func) ),

depPack.Data);

}

template

typename D,

typename DOut = D,

typename E,

typename FIn,

typename ... TDepValues

auto MakeContinuation(const Events<D,E>& trigger,

const SignalPack<D,TDepValues...>& depPack, FIn&& func)

-> Continuation<D,DOut>

{

return MakeContinuation<D,DOut>(0, trigger, depPack, std::forward<FIn>(func));

}

///////////////////////////////////////////////////////////////////////////////////////////////

/// DoTransaction

///////////////////////////////////////////////////////////////////////////////////////////////

template <typename D, typename F>

void DoTransaction(F&& func)

{

using REACT_IMPL::DomainSpecificInputManager;

DomainSpecificInputManager<D>::Instance().DoTransaction(0, std::forward<F>(func));

}

template <typename D, typename F>

void DoTransaction(TransactionFlagsT flags, F&& func)

{

using REACT_IMPL::DomainSpecificInputManager;

DomainSpecificInputManager<D>::Instance().DoTransaction(flags, std::forward<F>(func));

}

///////////////////////////////////////////////////////////////////////////////////////////////

/// AsyncTransaction

///////////////////////////////////////////////////////////////////////////////////////////////

template <typename D, typename F>

void AsyncTransaction(F&& func)

{

static_assert(D::is_concurrent,

"AsyncTransaction: Domain does not support concurrent input.");

using REACT_IMPL::DomainSpecificInputManager;

DomainSpecificInputManager<D>::Instance()

.AsyncTransaction(0, nullptr, std::forward<F>(func));

}

template <typename D, typename F>

void AsyncTransaction(TransactionFlagsT flags, F&& func)

{

static_assert(D::is_concurrent,

"AsyncTransaction: Domain does not support concurrent input.");

using REACT_IMPL::DomainSpecificInputManager;

DomainSpecificInputManager<D>::Instance()

.AsyncTransaction(flags, nullptr, std::forward<F>(func));

}

template <typename D, typename F>

void AsyncTransaction(TransactionStatus& status, F&& func)

{

static_assert(D::is_concurrent,

"AsyncTransaction: Domain does not support concurrent input.");

using REACT_IMPL::DomainSpecificInputManager;

DomainSpecificInputManager<D>::Instance()

.AsyncTransaction(0, status.statePtr_, std::forward<F>(func));

}

template <typename D, typename F>

void AsyncTransaction(TransactionFlagsT flags, TransactionStatus& status, F&& func)

{

static_assert(D::is_concurrent,

"AsyncTransaction: Domain does not support concurrent input.");

using REACT_IMPL::DomainSpecificInputManager;

DomainSpecificInputManager<D>::Instance()

.AsyncTransaction(flags, status.statePtr_, std::forward<F>(func));

}

/******************************************/ REACT_END /******************************************/

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Domain definition macro

///////////////////////////////////////////////////////////////////////////////////////////////////

#define REACTIVE_DOMAIN(name, ...) \

struct name : \

public REACT_IMPL::DomainBase<name, REACT_IMPL::DomainPolicy< __VA_ARGS__ >> {}; \

static REACT_IMPL::DomainInitializer<name> name ## _initializer_;

A brief reminder why the domain initializer is here:

Each domain has a couple of singletons (debug log, engine, input manager) which are

currently implemented as meyer singletons. From what I understand, these are thread-safe

in C++11, but not all compilers implement that yet. That's why a static initializer has

been added to make sure singleton creation happens before any multi-threaded access.

This implemenation is obviously inconsequential.

///////////////////////////////////////////////////////////////////////////////////////////////////

/// Define type aliases for given domain

///////////////////////////////////////////////////////////////////////////////////////////////////

#define USING_REACTIVE_DOMAIN(name) \

template <typename S> \

using SignalT = Signal<name,S>; \

template <typename S> \

using VarSignalT = VarSignal<name,S>; \

template <typename E = Token> \

using EventsT = Events<name,E>; \

template <typename E = Token> \

using EventSourceT = EventSource<name,E>; \

using ObserverT = Observer<name>; \

using ScopedObserverT = ScopedObserver<name>; \

using ReactorT = Reactor<name>;

#endif // REACT_DOMAIN_H_INCLUDED

cpp.react/include/react/Domain.h at master · lineCode/cpp.react · GitHub

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