public void CreateSnapshotTest()
{
HistorianKey key = new HistorianKey();
HistorianValue value = new HistorianValue();
key.Timestamp = 1;
key.PointID = 2;
value.Value1 = 3;
value.Value2 = 4;
using (SortedTreeTable <HistorianKey, HistorianValue> target = SortedTreeFile.CreateInMemory().OpenOrCreateTable <HistorianKey, HistorianValue>(EncodingDefinition.FixedSizeCombinedEncoding))
{
ulong date = 1;
ulong pointId = 2;
ulong value1 = 3;
ulong value2 = 4;
SortedTreeTableSnapshotInfo <HistorianKey, HistorianValue> snap1;
using (SortedTreeTableEditor <HistorianKey, HistorianValue> fileEditor = target.BeginEdit())
{
fileEditor.AddPoint(key, value);
key.Timestamp++;
fileEditor.AddPoint(key, value);
snap1 = target.AcquireReadSnapshot();
fileEditor.Commit();
}
SortedTreeTableSnapshotInfo <HistorianKey, HistorianValue> snap2 = target.AcquireReadSnapshot();
using (SortedTreeTableReadSnapshot <HistorianKey, HistorianValue> instance = snap1.CreateReadSnapshot())
{
SortedTreeScannerBase <HistorianKey, HistorianValue> scanner = instance.GetTreeScanner();
scanner.SeekToStart();
Assert.AreEqual(false, scanner.Read(key, value));
}
using (SortedTreeTableReadSnapshot <HistorianKey, HistorianValue> instance = snap2.CreateReadSnapshot())
{
SortedTreeScannerBase <HistorianKey, HistorianValue> scanner = instance.GetTreeScanner();
scanner.SeekToStart();
Assert.AreEqual(true, scanner.Read(key, value));
Assert.AreEqual(1uL, key.Timestamp);
Assert.AreEqual(2uL, key.PointID);
Assert.AreEqual(3uL, value.Value1);
Assert.AreEqual(4uL, value.Value2);
}
Assert.AreEqual(1uL, target.FirstKey.Timestamp);
Assert.AreEqual(2uL, target.LastKey.Timestamp);
}
}
public void ConcurrentReadingFromAFile()
{
string fileName = @"C:\Temp\ArchiveFile.d2";
HistorianKey key1 = new HistorianKey();
HistorianKey key2 = new HistorianKey();
HistorianValue value1 = new HistorianValue();
HistorianValue value2 = new HistorianValue();
using (SortedTreeFile file = SortedTreeFile.OpenFile(fileName, isReadOnly: true))
using (SortedTreeTable <HistorianKey, HistorianValue> table = file.OpenTable <HistorianKey, HistorianValue>())
{
SortedTreeTableSnapshotInfo <HistorianKey, HistorianValue> snapshotInfo = table.AcquireReadSnapshot();
using (SortedTreeTableReadSnapshot <HistorianKey, HistorianValue> reader1 = snapshotInfo.CreateReadSnapshot())
using (SortedTreeTableReadSnapshot <HistorianKey, HistorianValue> reader2 = snapshotInfo.CreateReadSnapshot())
{
SortedTreeScannerBase <HistorianKey, HistorianValue> scanner1 = reader1.GetTreeScanner();
SortedTreeScannerBase <HistorianKey, HistorianValue> scanner2 = reader2.GetTreeScanner();
scanner1.SeekToStart();
scanner2.SeekToStart();
bool scanner1Read = scanner1.Read(key1, value1);
bool scanner2Read = scanner2.Read(key2, value2);
while (scanner1Read && scanner2Read)
{
Assert.AreEqual(key1.Timestamp, key2.Timestamp);
Assert.AreEqual(key1.PointID, key2.PointID);
Assert.AreEqual(key1.EntryNumber, key2.EntryNumber);
Assert.AreEqual(value1.Value1, value2.Value1);
Assert.AreEqual(value1.Value2, value2.Value2);
Assert.AreEqual(value1.Value3, value2.Value3);
scanner1Read = scanner1.Read(key1, value1);
scanner2Read = scanner2.Read(key2, value2);
}
}
}
ReadDataFromAFile();
}