Chris@168: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@168: 
Chris@168: /*
Chris@168:     Sonic Visualiser
Chris@168:     An audio file viewer and annotation editor.
Chris@168:     Centre for Digital Music, Queen Mary, University of London.
Chris@202:     This file copyright 2006 QMUL.
Chris@168:     
Chris@168:     This program is free software; you can redistribute it and/or
Chris@168:     modify it under the terms of the GNU General Public License as
Chris@168:     published by the Free Software Foundation; either version 2 of the
Chris@168:     License, or (at your option) any later version.  See the file
Chris@168:     COPYING included with this distribution for more information.
Chris@168: */
Chris@168: 
Chris@168: #include "StorageAdviser.h"
Chris@168: 
Chris@168: #include "Exceptions.h"
Chris@168: #include "TempDirectory.h"
Chris@168: 
Chris@168: #include "system/System.h"
Chris@168: 
Chris@168: #include <iostream>
Chris@168: 
Chris@374: //#define DEBUG_STORAGE_ADVISER 1
Chris@374: 
Chris@205: long StorageAdviser::m_discPlanned = 0;
Chris@205: long StorageAdviser::m_memoryPlanned = 0;
Chris@205: 
Chris@168: StorageAdviser::Recommendation
Chris@411: StorageAdviser::m_baseRecommendation = StorageAdviser::NoRecommendation;
Chris@411: 
Chris@411: StorageAdviser::Recommendation
Chris@168: StorageAdviser::recommend(Criteria criteria,
Chris@168: 			  int minimumSize,
Chris@168: 			  int maximumSize)
Chris@168: {
Chris@374: #ifdef DEBUG_STORAGE_ADVISER
Chris@170:     std::cerr << "StorageAdviser::recommend: Criteria " << criteria 
Chris@170:               << ", minimumSize " << minimumSize
Chris@170:               << ", maximumSize " << maximumSize << std::endl;
Chris@374: #endif
Chris@170: 
Chris@411:     if (m_baseRecommendation != NoRecommendation) {
Chris@411:         return m_baseRecommendation; // for now
Chris@411:     }
Chris@411: 
Chris@168:     QString path = TempDirectory::getInstance()->getPath();
Chris@170:     int discFree = GetDiscSpaceMBAvailable(path.toLocal8Bit());
Chris@170:     int memoryFree, memoryTotal;
Chris@170:     GetRealMemoryMBAvailable(memoryFree, memoryTotal);
Chris@168: 
Chris@205:     if (discFree > m_discPlanned / 1024 + 1) {
Chris@205:         discFree -= m_discPlanned / 1024 + 1;
Chris@205:     } else if (discFree > 0) { // can also be -1 for unknown
Chris@205:         discFree = 0;
Chris@205:     }
Chris@205: 
Chris@205:     if (memoryFree > m_memoryPlanned / 1024 + 1) {
Chris@205:         memoryFree -= m_memoryPlanned / 1024 + 1;
Chris@205:     } else if (memoryFree > 0) { // can also be -1 for unknown
Chris@205:         memoryFree = 0;
Chris@205:     }
Chris@205: 
Chris@374: #ifdef DEBUG_STORAGE_ADVISER
Chris@334:     std::cerr << "Disc space: " << discFree << ", memory free: " << memoryFree << ", memory total: " << memoryTotal << ", min " << minimumSize << ", max " << maximumSize << std::endl;
Chris@374: #endif
Chris@168: 
Chris@192:     //!!! We have a potentially serious problem here if multiple
Chris@192:     //recommendations are made in advance of any of the resulting
Chris@192:     //allocations, as the allocations that have been recommended for
Chris@192:     //won't be taken into account in subsequent recommendations.
Chris@192: 
Chris@170:     enum StorageStatus {
Chris@170:         Unknown,
Chris@170:         Insufficient,
Chris@170:         Marginal,
Chris@170:         Sufficient
Chris@170:     };
Chris@168: 
Chris@170:     StorageStatus memoryStatus = Unknown;
Chris@170:     StorageStatus discStatus = Unknown;
Chris@170: 
Chris@170:     int minmb = minimumSize / 1024 + 1;
Chris@170:     int maxmb = maximumSize / 1024 + 1;
Chris@170: 
Chris@170:     if (memoryFree == -1) memoryStatus = Unknown;
Chris@170:     else if (minmb > (memoryFree * 3) / 4) memoryStatus = Insufficient;
Chris@170:     else if (maxmb > (memoryFree * 3) / 4) memoryStatus = Marginal;
Chris@170:     else if (minmb > (memoryFree / 3)) memoryStatus = Marginal;
Chris@170:     else if (memoryTotal == -1 ||
Chris@170:              minmb > (memoryTotal / 10)) memoryStatus = Marginal;
Chris@359:     else if (memoryFree < memoryTotal / 4) memoryStatus = Marginal;
Chris@170:     else memoryStatus = Sufficient;
Chris@170: 
Chris@170:     if (discFree == -1) discStatus = Unknown;
Chris@170:     else if (minmb > (discFree * 3) / 4) discStatus = Insufficient;
Chris@173:     else if (maxmb > (discFree / 4)) discStatus = Marginal;
Chris@173:     else if (minmb > (discFree / 10)) discStatus = Marginal;
Chris@170:     else discStatus = Sufficient;
Chris@170: 
Chris@374: #ifdef DEBUG_STORAGE_ADVISER
Chris@170:     std::cerr << "Memory status: " << memoryStatus << ", disc status "
Chris@170:               << discStatus << std::endl;
Chris@374: #endif
Chris@170: 
Chris@170:     int recommendation = NoRecommendation;
Chris@170: 
Chris@170:     if (memoryStatus == Insufficient || memoryStatus == Unknown) {
Chris@170: 
Chris@170:         recommendation |= UseDisc;
Chris@170: 
Chris@170:         if (discStatus == Insufficient && minmb > discFree) {
Chris@170:             throw InsufficientDiscSpace(path, minmb, discFree);
Chris@170:         }
Chris@170: 
Chris@170:         if (discStatus == Insufficient || discStatus == Marginal) {
Chris@170:             recommendation |= ConserveSpace;
Chris@170:         } else if (discStatus == Unknown && !(criteria & PrecisionCritical)) {
Chris@170:             recommendation |= ConserveSpace;
Chris@170:         } else {
Chris@170:             recommendation |= UseAsMuchAsYouLike;
Chris@170:         }
Chris@170: 
Chris@170:     } else if (memoryStatus == Marginal) {
Chris@170: 
Chris@170:         if (((criteria & SpeedCritical) ||
Chris@170:              (criteria & FrequentLookupLikely)) &&
Chris@170:             !(criteria & PrecisionCritical) &&
Chris@170:             !(criteria & LongRetentionLikely)) {
Chris@170: 
Chris@170:             // requirements suggest a preference for memory
Chris@170: 
Chris@170:             if (discStatus != Insufficient) {
Chris@170:                 recommendation |= PreferMemory;
Chris@170:             } else {
Chris@170:                 recommendation |= UseMemory;
Chris@170:             }
Chris@170: 
Chris@170:             recommendation |= ConserveSpace;
Chris@170: 
Chris@170:         } else {
Chris@170: 
Chris@170:             if (discStatus == Insufficient) {
Chris@170:                 recommendation |= (UseMemory | ConserveSpace);
Chris@170:             } else if (discStatus == Marginal) {
Chris@170:                 recommendation |= (PreferMemory | ConserveSpace);
Chris@170:             } else if (discStatus == Unknown) {
Chris@170:                 recommendation |= (PreferDisc | ConserveSpace);
Chris@170:             } else {
Chris@170:                 recommendation |= (UseDisc | UseAsMuchAsYouLike);
Chris@170:             }
Chris@170:         }    
Chris@170: 
Chris@170:     } else {
Chris@170: 
Chris@170:         if (discStatus == Insufficient) {
Chris@170:             recommendation |= (UseMemory | ConserveSpace);
Chris@170:         } else if (discStatus != Sufficient) {
Chris@170:             recommendation |= (PreferMemory | ConserveSpace);
Chris@170:         } else {
Chris@170: 
Chris@170:             if ((criteria & SpeedCritical) ||
Chris@170:                 (criteria & FrequentLookupLikely)) {
Chris@170:                 recommendation |= PreferMemory;
Chris@170:                 if (criteria & PrecisionCritical) {
Chris@170:                     recommendation |= UseAsMuchAsYouLike;
Chris@170:                 } else {
Chris@170:                     recommendation |= ConserveSpace;
Chris@170:                 }
Chris@170:             } else {
Chris@170:                 recommendation |= PreferDisc;
Chris@170:                 recommendation |= UseAsMuchAsYouLike;
Chris@170:             }
Chris@170:         }
Chris@170:     }
Chris@170: 
Chris@170:     return Recommendation(recommendation);
Chris@168: }
Chris@168: 
Chris@205: void
Chris@205: StorageAdviser::notifyPlannedAllocation(AllocationArea area, int size)
Chris@205: {
Chris@205:     if (area == MemoryAllocation) m_memoryPlanned += size;
Chris@205:     else if (area == DiscAllocation) m_discPlanned += size;
Chris@259: //    std::cerr << "storage planned up: memory: " << m_memoryPlanned << ", disc "
Chris@259: //              << m_discPlanned << std::endl;
Chris@205: }
Chris@205: 
Chris@205: void
Chris@205: StorageAdviser::notifyDoneAllocation(AllocationArea area, int size)
Chris@205: {
Chris@205:     if (area == MemoryAllocation) {
Chris@205:         if (m_memoryPlanned > size) m_memoryPlanned -= size;
Chris@205:         else m_memoryPlanned = 0;
Chris@205:     } else if (area == DiscAllocation) {
Chris@205:         if (m_discPlanned > size) m_discPlanned -= size; 
Chris@205:         else m_discPlanned = 0;
Chris@205:     }
Chris@259: //    std::cerr << "storage planned down: memory: " << m_memoryPlanned << ", disc "
Chris@259: //              << m_discPlanned << std::endl;
Chris@205: }
Chris@205: 
Chris@411: void
Chris@411: StorageAdviser::setFixedRecommendation(Recommendation recommendation)
Chris@411: {
Chris@411:     m_baseRecommendation = recommendation;
Chris@411: }
Chris@411: