// Creates a memory stream with the first 4K bytes of the record.
private void CreateMemoryStream()
{
byte[] pData;
int cbData = INITIAL_READ;
int totalSize;
log.ReadRecordPrefix(this.recordSequenceNumber, out pData, ref cbData, out totalSize, out this.prevSeqNum, out this.nextSeqNum);
if (cbData < FileLogRecordHeader.Size)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.LogCorrupt());
this.header = new FileLogRecordHeader(pData);
this.recordSize = totalSize - FileLogRecordHeader.Size;
int streamSize = Math.Min(this.recordSize,
INITIAL_READ - FileLogRecordHeader.Size);
this.stream = new MemoryStream(
pData,
FileLogRecordHeader.Size,
streamSize,
false);
if (totalSize <= INITIAL_READ)
{
// Record is smaller than 4K. We have read the entire record.
this.entireRecordRead = true;
}
}
public AppendHelper(IList <ArraySegment <byte> > data,
SequenceNumber prev,
SequenceNumber next,
bool restartArea)
{
this.prev = prev;
this.next = next;
this.header = new FileLogRecordHeader(null);
this.header.IsRestartArea = restartArea;
this.header.PreviousLsn = prev;
this.header.NextUndoLsn = next;
this.blobs = new UnmanagedBlob[data.Count + 1];
this.handles = new GCHandle[data.Count + 1];
try
{
this.handles[0] = GCHandle.Alloc(header.Bits, GCHandleType.Pinned);
this.blobs[0].cbSize = (uint)FileLogRecordHeader.Size;
this.blobs[0].pBlobData = Marshal.UnsafeAddrOfPinnedArrayElement(header.Bits, 0);
for (int i = 0; i < data.Count; i++)
{
handles[i + 1] = GCHandle.Alloc(data[i].Array, GCHandleType.Pinned);
blobs[i + 1].cbSize = (uint)data[i].Count;
blobs[i + 1].pBlobData = Marshal.UnsafeAddrOfPinnedArrayElement(data[i].Array, data[i].Offset);
}
}
catch
{
Dispose();
throw;
}
}
public AppendHelper(IList<ArraySegment<byte>> data,
SequenceNumber prev,
SequenceNumber next,
bool restartArea)
{
this.prev = prev;
this.next = next;
this.header = new FileLogRecordHeader(null);
this.header.IsRestartArea = restartArea;
this.header.PreviousLsn = prev;
this.header.NextUndoLsn = next;
this.blobs = new UnmanagedBlob[data.Count + 1];
this.handles = new GCHandle[data.Count + 1];
try
{
this.handles[0] = GCHandle.Alloc(header.Bits, GCHandleType.Pinned);
this.blobs[0].cbSize = (uint)FileLogRecordHeader.Size;
this.blobs[0].pBlobData = Marshal.UnsafeAddrOfPinnedArrayElement(header.Bits, 0);
for (int i = 0; i < data.Count; i++)
{
handles[i + 1] = GCHandle.Alloc(data[i].Array, GCHandleType.Pinned);
blobs[i + 1].cbSize = (uint)data[i].Count;
blobs[i + 1].pBlobData = Marshal.UnsafeAddrOfPinnedArrayElement(data[i].Array, data[i].Offset);
}
}
catch
{
Dispose();
throw;
}
}
// Creates a memory stream with the first 4K bytes of the record.
private void CreateMemoryStream()
{
byte[] pData;
int cbData = INITIAL_READ;
int totalSize;
log.ReadRecordPrefix(this.recordSequenceNumber, out pData, ref cbData, out totalSize, out this.prevSeqNum, out this.nextSeqNum);
if (cbData < FileLogRecordHeader.Size)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.LogCorrupt());
}
this.header = new FileLogRecordHeader(pData);
this.recordSize = totalSize - FileLogRecordHeader.Size;
int streamSize = Math.Min(this.recordSize,
INITIAL_READ - FileLogRecordHeader.Size);
this.stream = new MemoryStream(
pData,
FileLogRecordHeader.Size,
streamSize,
false);
if (totalSize <= INITIAL_READ)
{
// Record is smaller than 4K. We have read the entire record.
this.entireRecordRead = true;
}
}
