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65 lines
2.1 KiB
C++
65 lines
2.1 KiB
C++
//
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// DiskImageImplementation.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 22/09/2017.
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// Copyright 2017 Thomas Harte. All rights reserved.
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//
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template <typename T> HeadPosition DiskImageHolder<T>::get_maximum_head_position() {
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return disk_image_.get_maximum_head_position();
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}
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template <typename T> int DiskImageHolder<T>::get_head_count() {
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return disk_image_.get_head_count();
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}
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template <typename T> bool DiskImageHolder<T>::get_is_read_only() {
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return disk_image_.get_is_read_only();
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}
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template <typename T> void DiskImageHolder<T>::flush_tracks() {
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if(!unwritten_tracks_.empty()) {
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if(!update_queue_) update_queue_ = std::make_unique<Concurrency::AsyncTaskQueue>();
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using TrackMap = std::map<Track::Address, std::shared_ptr<Track>>;
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std::shared_ptr<TrackMap> track_copies(new TrackMap);
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for(const auto &address : unwritten_tracks_) {
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track_copies->insert(std::make_pair(address, std::shared_ptr<Track>(cached_tracks_[address]->clone())));
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}
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unwritten_tracks_.clear();
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update_queue_->enqueue([this, track_copies]() {
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disk_image_.set_tracks(*track_copies);
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});
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}
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}
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template <typename T> void DiskImageHolder<T>::set_track_at_position(Track::Address address, const std::shared_ptr<Track> &track) {
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if(disk_image_.get_is_read_only()) return;
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unwritten_tracks_.insert(address);
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cached_tracks_[address] = track;
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}
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template <typename T> std::shared_ptr<Track> DiskImageHolder<T>::get_track_at_position(Track::Address address) {
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if(address.head >= get_head_count()) return nullptr;
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if(address.position >= get_maximum_head_position()) return nullptr;
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auto cached_track = cached_tracks_.find(address);
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if(cached_track != cached_tracks_.end()) return cached_track->second;
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std::shared_ptr<Track> track = disk_image_.get_track_at_position(address);
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if(!track) return nullptr;
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cached_tracks_[address] = track;
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return track;
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}
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template <typename T> DiskImageHolder<T>::~DiskImageHolder() {
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if(update_queue_) update_queue_->flush();
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}
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template <typename T> bool DiskImageHolder<T>::tracks_differ(Track::Address lhs, Track::Address rhs) {
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return disk_image_.tracks_differ(lhs, rhs);
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}
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