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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 QMUL.
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>
//#define DEBUG_STORAGE_ADVISER 1
size_t StorageAdviser::m_discPlanned = 0;
size_t StorageAdviser::m_memoryPlanned = 0;
StorageAdviser::Recommendation
StorageAdviser::m_baseRecommendation = StorageAdviser::NoRecommendation;
StorageAdviser::Recommendation
StorageAdviser::recommend(Criteria criteria,
size_t minimumSize,
size_t maximumSize)
{
#ifdef DEBUG_STORAGE_ADVISER
SVDEBUG << "StorageAdviser::recommend: Criteria " << criteria
<< ", minimumSize " << minimumSize
<< ", maximumSize " << maximumSize << endl;
#endif
if (m_baseRecommendation != NoRecommendation) {
return m_baseRecommendation; // for now
}
QString path;
try {
path = TempDirectory::getInstance()->getPath();
} catch (std::exception e) {
cerr << "StorageAdviser::recommend: ERROR: Failed to get temporary directory path: " << e.what() << endl;
return Recommendation(UseMemory | ConserveSpace);
}
ssize_t discFree = GetDiscSpaceMBAvailable(path.toLocal8Bit());
ssize_t memoryFree, memoryTotal;
GetRealMemoryMBAvailable(memoryFree, memoryTotal);
if (discFree > ssize_t(m_discPlanned / 1024 + 1)) {
discFree -= m_discPlanned / 1024 + 1;
} else if (discFree > 0) { // can also be -1 for unknown
discFree = 0;
}
if (memoryFree > ssize_t(m_memoryPlanned / 1024 + 1)) {
memoryFree -= m_memoryPlanned / 1024 + 1;
} else if (memoryFree > 0) { // can also be -1 for unknown
memoryFree = 0;
}
#ifdef DEBUG_STORAGE_ADVISER
cerr << "Disc space: " << discFree << ", memory free: " << memoryFree << ", memory total: " << memoryTotal << ", min " << minimumSize << ", max " << maximumSize << endl;
#endif
//!!! 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;
ssize_t minmb = ssize_t(minimumSize / 1024 + 1);
ssize_t maxmb = ssize_t(maximumSize / 1024 + 1);
if (memoryFree == -1) memoryStatus = Unknown;
else if (memoryFree < memoryTotal / 3) memoryStatus = Insufficient;
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;
#ifdef DEBUG_STORAGE_ADVISER
cerr << "Memory status: " << memoryStatus << ", disc status "
<< discStatus << endl;
#endif
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);
}
void
StorageAdviser::notifyPlannedAllocation(AllocationArea area, size_t size)
{
if (area == MemoryAllocation) m_memoryPlanned += size;
else if (area == DiscAllocation) m_discPlanned += size;
// cerr << "storage planned up: memory: " << m_memoryPlanned << ", disc "
// << m_discPlanned << endl;
}
void
StorageAdviser::notifyDoneAllocation(AllocationArea area, size_t size)
{
if (area == MemoryAllocation) {
if (m_memoryPlanned > size) m_memoryPlanned -= size;
else m_memoryPlanned = 0;
} else if (area == DiscAllocation) {
if (m_discPlanned > size) m_discPlanned -= size;
else m_discPlanned = 0;
}
// cerr << "storage planned down: memory: " << m_memoryPlanned << ", disc "
// << m_discPlanned << endl;
}
void
StorageAdviser::setFixedRecommendation(Recommendation recommendation)
{
m_baseRecommendation = recommendation;
}
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