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111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
//
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// JustInTime.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 28/07/2019.
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// Copyright © 2019 Thomas Harte. All rights reserved.
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//
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#ifndef JustInTime_h
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#define JustInTime_h
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#include "../Concurrency/AsyncTaskQueue.hpp"
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/*!
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A JustInTimeActor holds (i) an embedded object with a run_for method; and (ii) an amount
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of time since run_for was last called.
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Time can be added using the += operator. The -> operator can be used to access the
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embedded object. All time accumulated will be pushed to object before the pointer is returned.
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Machines that accumulate HalfCycle time but supply to a Cycle-counted device may supply a
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separate @c TargetTimeScale at template declaration.
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*/
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template <class T, class LocalTimeScale = HalfCycles, class TargetTimeScale = LocalTimeScale> class JustInTimeActor {
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public:
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/// Constructs a new JustInTimeActor using the same construction arguments as the included object.
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template<typename... Args> JustInTimeActor(Args&&... args) : object_(std::forward<Args>(args)...) {}
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/// Adds time to the actor.
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inline void operator += (const LocalTimeScale &rhs) {
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time_since_update_ += rhs;
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is_flushed_ = false;
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}
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/// Flushes all accumulated time and returns a pointer to the included object.
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inline T *operator->() {
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flush();
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return &object_;
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}
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/// Returns a pointer to the included object without flushing time.
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inline T *last_valid() {
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return &object_;
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}
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/// Flushes all accumulated time.
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inline void flush() {
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if(!is_flushed_) object_.run_for(time_since_update_.template flush<TargetTimeScale>());
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is_flushed_ = true;
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}
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private:
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T object_;
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LocalTimeScale time_since_update_;
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bool is_flushed_ = true;
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};
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/*!
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A AsyncJustInTimeActor acts like a JustInTimeActor but additionally contains an AsyncTaskQueue.
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Any time the amount of accumulated time crosses a threshold provided at construction time,
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the object will be updated on the AsyncTaskQueue.
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*/
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template <class T, class LocalTimeScale = HalfCycles, class TargetTimeScale = LocalTimeScale> class AsyncJustInTimeActor {
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public:
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/// Constructs a new AsyncJustInTimeActor using the same construction arguments as the included object.
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template<typename... Args> AsyncJustInTimeActor(TargetTimeScale threshold, Args&&... args) :
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object_(std::forward<Args>(args)...),
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threshold_(threshold) {}
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/// Adds time to the actor.
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inline void operator += (const LocalTimeScale &rhs) {
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time_since_update_ += rhs;
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if(time_since_update_ >= threshold_) {
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time_since_update_ -= threshold_;
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task_queue_.enqueue([this] () {
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object_.run_for(threshold_);
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});
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}
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is_flushed_ = false;
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}
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/// Flushes all accumulated time and returns a pointer to the included object.
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inline T *operator->() {
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flush();
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return &object_;
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}
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/// Returns a pointer to the included object without flushing time.
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inline T *last_valid() {
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return &object_;
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}
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/// Flushes all accumulated time.
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inline void flush() {
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if(!is_flushed_) {
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task_queue_.flush();
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object_.run_for(time_since_update_.template flush<TargetTimeScale>());
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is_flushed_ = true;
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}
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}
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private:
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T object_;
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LocalTimeScale time_since_update_;
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TargetTimeScale threshold_;
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bool is_flushed_ = true;
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Concurrency::AsyncTaskQueue task_queue_;
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};
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#endif /* JustInTime_h */
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