Mercurial > hg > svcore
view base/StorageAdviser.h @ 169:603991c63ff6
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author | Chris Cannam |
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date | Mon, 25 Sep 2006 20:32:44 +0000 |
parents | 04baa690f90d |
children | b23eea68357e |
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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. */ #ifndef _STORAGE_ADVISER_H_ #define _STORAGE_ADVISER_H_ /** * A utility class designed to help decide whether to store cache data * (for example FFT outputs) in memory or on disk in the TempDirectory. */ class StorageAdviser { public: // pass to recommend() zero or more of these OR'd together enum Criteria { SpeedCritical = 1, PrecisionCritical = 2, RepeatabilityUseful = 4 }; // recommend() returns one or two of these OR'd together enum Recommendation { UseMemory = 1, UseDisc = 2, ConserveSpace = 4, UseAsMuchAsYouLike = 8 }; // May throw InsufficientDiscSpace exception if it looks like // minimumSize won't fit on the disc. /** * Recommend where to store some data, given certain storage and * recall criteria. The minimum size is the approximate amount of * data in bytes that will be stored if the recommendation is to * ConserveSpace; the maximum size is approximately the amount * that will be used if UseAsMuchAsYouLike is returned. **!!! sizes should be longer types */ static Recommendation recommend(Criteria criteria, int minimumSize, int maximumSize); }; #endif