changeset 200:2f2d282d45d0

* Somewhat better handling of running out of memory or disc space

--- a/data/fft/FFTDataServer.cpp	Fri Nov 10 17:45:26 2006 +0000
+++ b/data/fft/FFTDataServer.cpp	Mon Nov 13 14:48:57 2006 +0000
@@ -23,8 +23,12 @@
 #include "system/System.h"
 
 #include "base/StorageAdviser.h"
+#include "base/Exceptions.h"
 #include "base/Profiler.h"
 
+#include <QMessageBox>
+#include <QApplication>
+
 
 //#define DEBUG_FFT_SERVER 1
 //#define DEBUG_FFT_SERVER_FILL 1
@@ -76,19 +80,26 @@
         return server;
     }
 
-    m_servers[n] = ServerCountPair
-        (new FFTDataServer(n,
-                           model,
-                           channel,
-                           windowType,
-                           windowSize,
-                           windowIncrement,
-                           fftSize,
-                           polar,
-                           fillFromColumn),
-         1);
+    try {
+        server = new FFTDataServer(n,
+                                   model,
+                                   channel,
+                                   windowType,
+                                   windowSize,
+                                   windowIncrement,
+                                   fftSize,
+                                   polar,
+                                   fillFromColumn);
+    } catch (InsufficientDiscSpace) {
+        delete server;
+        server = 0;
+    }
 
-    return m_servers[n].first;
+    if (server) {
+        m_servers[n] = ServerCountPair(server, 1);
+    }
+
+    return server;
 }
 
 FFTDataServer *
@@ -364,9 +375,11 @@
     int minimumSize = (cells / 1024) * sizeof(uint16_t); // kb
     int maximumSize = (cells / 1024) * sizeof(float); // kb
 
-    //!!! catch InsufficientDiscSpace
+    // This can throw InsufficientDiscSpace.  We don't catch it here -- we
+    // haven't allocated anything yet and can safely let the exception out.
+    // Caller needs to check for it.
     
-    StorageAdviser::Recommendation recommendation =
+    StorageAdviser::Recommendation recommendation = 
         StorageAdviser::recommend(criteria, minimumSize, maximumSize);
 
     std::cerr << "Recommendation was: " << recommendation << std::endl;
@@ -544,32 +557,46 @@
 
     FFTCache *cache = 0;
 
-    if (m_memoryCache) {
+    try {
+        
+        if (m_memoryCache) {
 
-        cache = new FFTMemoryCache();
+            cache = new FFTMemoryCache();
 
-    } else if (m_compactCache) {
+        } else if (m_compactCache) {
 
-        cache = new FFTFileCache(name, MatrixFile::ReadWrite,
-                                 FFTFileCache::Compact);
+            cache = new FFTFileCache(name, MatrixFile::ReadWrite,
+                                     FFTFileCache::Compact);
 
-    } else {
+        } else {
 
-        cache = new FFTFileCache(name, MatrixFile::ReadWrite,
-                                 m_polar ? FFTFileCache::Polar :
-                                           FFTFileCache::Rectangular);
+            cache = new FFTFileCache(name, MatrixFile::ReadWrite,
+                                     m_polar ? FFTFileCache::Polar :
+                                               FFTFileCache::Rectangular);
+        }
+
+        size_t width = m_cacheWidth;
+        if (c * m_cacheWidth + width > m_width) {
+            width = m_width - c * m_cacheWidth;
+        }
+
+        cache->resize(width, m_height);
+        cache->reset();
+
+    } catch (std::bad_alloc) {
+        std::cerr << "ERROR: Memory allocation failed in FFTFileCache::resize:"
+                  << " abandoning this cache" << std::endl;
+        //!!! Shouldn't be using QtGui here.  Need a better way to report this.
+        QMessageBox::critical
+            (0, QApplication::tr("FFT cache resize failed"),
+             QApplication::tr
+             ("Failed to create or resize an FFT model slice.\n"
+              "There may be insufficient memory or disc space to continue."));
+        delete cache;
+        m_caches[c] = 0;
+        return 0;
     }
 
-//    FFTCache *cache = new FFTMemoryCache();
-
-    size_t width = m_cacheWidth;
-    if (c * m_cacheWidth + width > m_width) {
-        width = m_width - c * m_cacheWidth;
-    }
-
-    cache->resize(width, m_height);
-    cache->reset();
-
     m_caches[c] = cache;
     m_lastUsedCache = c;
 
@@ -583,6 +610,7 @@
 
     size_t col;
     FFTCache *cache = getCache(x, col);
+    if (!cache) return 0;
 
     if (!cache->haveSetColumnAt(col)) {
         std::cerr << "FFTDataServer::getMagnitudeAt: calling fillColumn(" 
@@ -599,6 +627,7 @@
 
     size_t col;
     FFTCache *cache = getCache(x, col);
+    if (!cache) return 0;
 
     if (!cache->haveSetColumnAt(col)) {
         fillColumn(x);
@@ -613,6 +642,7 @@
 
     size_t col;
     FFTCache *cache = getCache(x, col);
+    if (!cache) return 0;
 
     if (!cache->haveSetColumnAt(col)) {
         fillColumn(x);
@@ -627,6 +657,7 @@
 
     size_t col;
     FFTCache *cache = getCache(x, col);
+    if (!cache) return 0;
 
     if (!cache->haveSetColumnAt(col)) {
         fillColumn(x);
@@ -641,6 +672,7 @@
 
     size_t col;
     FFTCache *cache = getCache(x, col);
+    if (!cache) { real = 0; imaginary = 0; return; }
 
     if (!cache->haveSetColumnAt(col)) {
 #ifdef DEBUG_FFT_SERVER
@@ -672,6 +704,7 @@
 
     size_t col;
     FFTCache *cache = getCache(x, col);
+    if (!cache) return true;
 
     return cache->haveSetColumnAt(col);
 }    
@@ -686,6 +719,7 @@
     std::cout << "FFTDataServer::fillColumn(" << x << ")" << std::endl;
 #endif
     FFTCache *cache = getCache(x, col);
+    if (!cache) return;
 
     QMutexLocker locker(&m_writeMutex);
 

--- a/data/model/FFTModel.cpp	Fri Nov 10 17:45:26 2006 +0000
+++ b/data/model/FFTModel.cpp	Mon Nov 13 14:48:57 2006 +0000
@@ -42,6 +42,8 @@
                                                polar,
                                                fillFromColumn);
 
+    if (!m_server) return; // caller should check isOK()
+
     size_t xratio = windowIncrement / m_server->getWindowIncrement();
     size_t yratio = m_server->getFFTSize() / fftSize;
 
@@ -71,7 +73,7 @@
 
 FFTModel::~FFTModel()
 {
-    FFTDataServer::releaseInstance(m_server);
+    if (m_server) FFTDataServer::releaseInstance(m_server);
 }
 
 size_t