Mercurial > hg > svcore
view base/StorageAdviser.cpp @ 193:bf1f256864de
* A start to a panner widget to go with thumbwheels
author | Chris Cannam |
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date | Wed, 18 Oct 2006 16:38:30 +0000 |
parents | 900ac6667eab |
children | 91fdc752e540 |
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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */ /* Sonic Visualiser An audio file viewer and annotation editor. Centre for Digital Music, Queen Mary, University of London. This file copyright 2006 Chris Cannam. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. See the file COPYING included with this distribution for more information. */ #include "StorageAdviser.h" #include "Exceptions.h" #include "TempDirectory.h" #include "system/System.h" #include <iostream> StorageAdviser::Recommendation StorageAdviser::recommend(Criteria criteria, int minimumSize, int maximumSize) { std::cerr << "StorageAdviser::recommend: Criteria " << criteria << ", minimumSize " << minimumSize << ", maximumSize " << maximumSize << std::endl; QString path = TempDirectory::getInstance()->getPath(); int discFree = GetDiscSpaceMBAvailable(path.toLocal8Bit()); int memoryFree, memoryTotal; GetRealMemoryMBAvailable(memoryFree, memoryTotal); std::cerr << "Disc space: " << discFree << ", memory free: " << memoryFree << ", memory total: " << memoryTotal << std::endl; //!!! We have a potentially serious problem here if multiple //recommendations are made in advance of any of the resulting //allocations, as the allocations that have been recommended for //won't be taken into account in subsequent recommendations. enum StorageStatus { Unknown, Insufficient, Marginal, Sufficient }; StorageStatus memoryStatus = Unknown; StorageStatus discStatus = Unknown; int minmb = minimumSize / 1024 + 1; int maxmb = maximumSize / 1024 + 1; if (memoryFree == -1) memoryStatus = Unknown; else if (minmb > (memoryFree * 3) / 4) memoryStatus = Insufficient; else if (maxmb > (memoryFree * 3) / 4) memoryStatus = Marginal; else if (minmb > (memoryFree / 3)) memoryStatus = Marginal; else if (memoryTotal == -1 || minmb > (memoryTotal / 10)) memoryStatus = Marginal; else memoryStatus = Sufficient; if (discFree == -1) discStatus = Unknown; else if (minmb > (discFree * 3) / 4) discStatus = Insufficient; else if (maxmb > (discFree / 4)) discStatus = Marginal; else if (minmb > (discFree / 10)) discStatus = Marginal; else discStatus = Sufficient; std::cerr << "Memory status: " << memoryStatus << ", disc status " << discStatus << std::endl; int recommendation = NoRecommendation; if (memoryStatus == Insufficient || memoryStatus == Unknown) { recommendation |= UseDisc; if (discStatus == Insufficient && minmb > discFree) { throw InsufficientDiscSpace(path, minmb, discFree); } if (discStatus == Insufficient || discStatus == Marginal) { recommendation |= ConserveSpace; } else if (discStatus == Unknown && !(criteria & PrecisionCritical)) { recommendation |= ConserveSpace; } else { recommendation |= UseAsMuchAsYouLike; } } else if (memoryStatus == Marginal) { if (((criteria & SpeedCritical) || (criteria & FrequentLookupLikely)) && !(criteria & PrecisionCritical) && !(criteria & LongRetentionLikely)) { // requirements suggest a preference for memory if (discStatus != Insufficient) { recommendation |= PreferMemory; } else { recommendation |= UseMemory; } recommendation |= ConserveSpace; } else { if (discStatus == Insufficient) { recommendation |= (UseMemory | ConserveSpace); } else if (discStatus == Marginal) { recommendation |= (PreferMemory | ConserveSpace); } else if (discStatus == Unknown) { recommendation |= (PreferDisc | ConserveSpace); } else { recommendation |= (UseDisc | UseAsMuchAsYouLike); } } } else { if (discStatus == Insufficient) { recommendation |= (UseMemory | ConserveSpace); } else if (discStatus != Sufficient) { recommendation |= (PreferMemory | ConserveSpace); } else { if ((criteria & SpeedCritical) || (criteria & FrequentLookupLikely)) { recommendation |= PreferMemory; if (criteria & PrecisionCritical) { recommendation |= UseAsMuchAsYouLike; } else { recommendation |= ConserveSpace; } } else { recommendation |= PreferDisc; recommendation |= UseAsMuchAsYouLike; } } } return Recommendation(recommendation); }