/// <summary>
/// The constructor.
/// </summary>
/// <param name="random">Specifies the CryptoRandom to use for random selection.</param>
/// <param name="log">Specifies the output log.</param>
/// <param name="src">Specifies the data source that holds the data on the database.</param>
/// <param name="factory">Specifies the data factory used to access the database data.</param>
/// <param name="rgAbort">Specifies the cancel handles.</param>
/// <param name="nMaxLoadCount">Optionally, specifies to automaticall start the image refresh which only applies when the number of images loaded into memory is less than the actual number of images (default = false).</param>
public MasterList(CryptoRandom random, Log log, SourceDescriptor src, DatasetFactory factory, List <WaitHandle> rgAbort, int nMaxLoadCount = 0)
{
m_random = random;
m_log = log;
m_src = src;
m_factory = factory;
m_rgAbort.Add(m_evtCancel);
if (rgAbort.Count > 0)
{
m_rgAbort.AddRange(rgAbort);
}
m_imgMean = m_factory.LoadImageMean(m_src.ID);
m_nLoadCount = nMaxLoadCount;
if (m_nLoadCount == 0 || m_nLoadCount > m_src.ImageCount)
{
m_nLoadCount = m_src.ImageCount;
}
m_rgImages = new SimpleDatum[m_nLoadCount];
m_nLoadedCount = 0;
if (m_nLoadCount < m_src.ImageCount)
{
m_refreshManager = new RefreshManager(random, m_src, m_factory);
}
}
public LoadSequence(CryptoRandom random, int nCount, int nImageCount, RefreshManager refresh)
{
// When using load limit (count < image count), load item indexes in such
// a way that balances the number of items per label.
if (nCount < nImageCount)
{
Dictionary <int, List <DbItem> > rgItemsByLabel = refresh.GetItemsByLabel();
List <int> rgLabel = rgItemsByLabel.Where(p => p.Value.Count > 0).Select(p => p.Key).ToList();
for (int i = 0; i < nCount; i++)
{
int nLabelIdx = random.Next(rgLabel.Count);
int nLabel = rgLabel[nLabelIdx];
List <DbItem> rgItems = rgItemsByLabel[nLabel];
int nItemIdx = random.Next(rgItems.Count);
DbItem item = rgItems[nItemIdx];
m_rgLoadSequence.Add(item.Index);
rgLabel.Remove(nLabel);
if (rgLabel.Count == 0)
{
rgLabel = rgItemsByLabel.Where(p => p.Value.Count > 0).Select(p => p.Key).ToList();
}
}
refresh.Reset();
}
// Otherwise just load all item indexes.
else
{
for (int i = 0; i < nCount; i++)
{
m_rgLoadSequence.Add(i);
}
}
}
