public void Reset()
{
lock (this.syncRoot)
{
if (this.state == State.Disposed)
{
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(Error.ObjectDisposed());
}
if (this.current != null)
{
this.current.Detach();
this.current = null;
}
if ((this.readContext != null) &&
(!this.readContext.IsInvalid))
{
this.readContext.Close();
this.readContext = null;
}
this.state = State.BeforeFirst;
}
}
bool ReadLogRecord()
{
if (!((this.readContext == null || this.readContext.IsInvalid) && (this.current == null)))
{
// An internal consistency check has failed. The indicates a bug in IO.Log's internal processing
// Rather than proceeding with non-deterministic execution and risking the loss or corruption of
// log records, we failfast the process.
DiagnosticUtility.FailFast("Should only call this for first record!");
}
unsafe
{
byte *readBuffer;
int bufferLength;
byte recordType;
ulong lsnUser;
ulong lsnPrevious;
if (!UnsafeNativeMethods.ReadLogRecordSync(
this.recordSequence.MarshalContext,
ref this.startLsn,
this.mode,
out readBuffer,
out bufferLength,
out recordType,
out lsnUser,
out lsnPrevious,
out this.readContext))
{
this.state = State.AfterLast;
return(false);
}
if ((recordType & Const.ClfsDataRecord) != 0)
{
this.current = new LogLogRecord(
new SequenceNumber(this.startLsn),
new SequenceNumber(lsnUser),
new SequenceNumber(lsnPrevious),
readBuffer,
bufferLength);
this.state = State.Valid;
return(true);
}
else
{
return(ReadNextLogRecord());
}
}
}
public void Dispose()
{
lock (this.syncRoot)
{
if (this.current != null)
{
this.current.Detach();
this.current = null;
}
if ((this.readContext != null) &&
(!this.readContext.IsInvalid))
{
this.readContext.Close();
}
this.state = State.Disposed;
}
}
bool ReadRestartArea()
{
if (!((this.readContext == null || this.readContext.IsInvalid) && (this.current == null)))
{
// An internal consistency check has failed. The indicates a bug in IO.Log's internal processing
// Rather than proceeding with non-deterministic execution and risking the loss or corruption of
// log records, we failfast the process.
DiagnosticUtility.FailFast("Should only call this for first record!");
}
unsafe
{
byte *readBuffer;
int bufferLength;
ulong lsnRecord;
if (!UnsafeNativeMethods.ReadLogRestartAreaSync(
this.recordSequence.MarshalContext,
out readBuffer,
out bufferLength,
out lsnRecord,
out this.readContext))
{
this.state = State.AfterLast;
return(false);
}
this.current = new LogLogRecord(
new SequenceNumber(lsnRecord),
SequenceNumber.Invalid,
SequenceNumber.Invalid,
readBuffer,
bufferLength);
this.state = State.Valid;
return(true);
}
}
