diff base/StorageAdviser.cpp @ 0:fc9323a41f5a

start base : Sonic Visualiser sv1-1.0rc1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/base/StorageAdviser.cpp	Fri May 11 09:08:14 2007 +0000
@@ -0,0 +1,187 @@
+/* -*- 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>
+
+long StorageAdviser::m_discPlanned = 0;
+long StorageAdviser::m_memoryPlanned = 0;
+
+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);
+
+    if (discFree > m_discPlanned / 1024 + 1) {
+        discFree -= m_discPlanned / 1024 + 1;
+    } else if (discFree > 0) { // can also be -1 for unknown
+        discFree = 0;
+    }
+
+    if (memoryFree > m_memoryPlanned / 1024 + 1) {
+        memoryFree -= m_memoryPlanned / 1024 + 1;
+    } else if (memoryFree > 0) { // can also be -1 for unknown
+        memoryFree = 0;
+    }
+
+    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);
+}
+
+void
+StorageAdviser::notifyPlannedAllocation(AllocationArea area, int size)
+{
+    if (area == MemoryAllocation) m_memoryPlanned += size;
+    else if (area == DiscAllocation) m_discPlanned += size;
+//    std::cerr << "storage planned up: memory: " << m_memoryPlanned << ", disc "
+//              << m_discPlanned << std::endl;
+}
+
+void
+StorageAdviser::notifyDoneAllocation(AllocationArea area, int 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;
+    }
+//    std::cerr << "storage planned down: memory: " << m_memoryPlanned << ", disc "
+//              << m_discPlanned << std::endl;
+}
+