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51 lines
1.5 KiB
C++
51 lines
1.5 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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{
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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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{
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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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modified_tracks_.insert(address);
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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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{
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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::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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std::shared_ptr<Track> Disk::get_modified_track_at_position(unsigned int head, unsigned int position)
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{
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int address = get_id_for_track_at_position(head, position);
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if(modified_tracks_.find(address) == modified_tracks_.end()) return nullptr;
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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 nullptr;
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return cached_track->second;
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}
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bool Disk::get_is_modified()
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{
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return !modified_tracks_.empty();
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}
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