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46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
//
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// Disk.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 10/07/2016.
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// Copyright © 2016 Thomas Harte. All rights reserved.
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//
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#include "Disk.hpp"
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using namespace Storage::Disk;
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int Disk::get_id_for_track_at_position(unsigned int head, unsigned int position) {
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return (int)(position * get_head_count() + head);
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}
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void Disk::set_track_at_position(unsigned int head, unsigned int position, const std::shared_ptr<Track> &track) {
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if(get_is_read_only()) return;
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int address = get_id_for_track_at_position(head, position);
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cached_tracks_[address] = track;
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if(!update_queue_) update_queue_.reset(new Concurrency::AsyncTaskQueue);
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std::shared_ptr<Track> track_copy(track->clone());
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update_queue_->enqueue([this, head, position, track_copy] {
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store_updated_track_at_position(head, position, track_copy, file_access_mutex_);
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});
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}
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std::shared_ptr<Track> Disk::get_track_at_position(unsigned int head, unsigned int position) {
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int address = get_id_for_track_at_position(head, position);
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std::map<int, std::shared_ptr<Track>>::iterator 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::lock_guard<std::mutex> lock_guard(file_access_mutex_);
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std::shared_ptr<Track> track = get_uncached_track_at_position(head, position);
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cached_tracks_[address] = track;
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return track;
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}
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void Disk::store_updated_track_at_position(unsigned int head, unsigned int position, const std::shared_ptr<Track> &track, std::mutex &file_access_mutex) {}
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void Disk::flush_updates() {
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if(update_queue_) update_queue_->flush();
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}
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