private void PageTracing(PagingAction action)
{
_stopTracePage = true;
StopFind();
lock (btnNext)
{
btnNext.Enabled = false;
btnLast.Enabled = false;
btnPrevious.Enabled = false;
btnTop.Enabled = false;
if (_tracingPageResult != null && _tracingPageDelegate != null)
{
_tracingPageDelegate.EndInvoke(_tracingPageResult);
}
_stopTracePage = false;
_tracingPageResult = _tracingPageDelegate.BeginInvoke(action,
new AsyncCallback(new Action <IAsyncResult>(
a =>
{
BeginInvoke(new Action(() =>
{
btnNext.Enabled = true;
btnLast.Enabled = true;
if (_currentPageTopOffset > 0 &&
MemoryMappedLog.TraceReader.NextReadOffset > 0)
{
btnPrevious.Enabled = true;
btnTop.Enabled = true;
}
}));
})), null);
}
}
private void TracingPageThread(PagingAction action)
{
int lastOffset = 0;
if (action == PagingAction.Previous)
{
_currentPageBottomOffset = _currentPageTopOffset;
lastOffset = _currentPageTopOffset;
}
else
{
_currentPageTopOffset = _currentPageBottomOffset;
lastOffset = _currentPageBottomOffset;
}
rtbTrace.Invoke(new Action(() => rtbTrace.Text = ""));
int numMessagesOutstanding = _pageSize;// + (action == PagingAction.Previous ? 1 : 0);
while (!_stopTracePage && numMessagesOutstanding > 0)
{
List <string> messages;
if (action == PagingAction.Next)
{
messages = MemoryMappedLog.TraceReader.ReadNextMessages(
numMessagesOutstanding, lastOffset);
lastOffset = MemoryMappedLog.TraceReader.NextReadOffset;
// For next, we wait until N number of messages have been received.
numMessagesOutstanding -= messages.Count;
}
else
{
messages = MemoryMappedLog.TraceReader.ReadPreviousMessages(
numMessagesOutstanding, lastOffset);
numMessagesOutstanding -= messages.Count;
if (numMessagesOutstanding > 0)
{
messages.AddRange(MemoryMappedLog.TraceReader.ReadNextMessages(numMessagesOutstanding, lastOffset));
_currentPageBottomOffset = MemoryMappedLog.TraceReader.NextReadOffset;
}
// For previous, we only try to get N number of previous messages once
numMessagesOutstanding = 0;
}
IAsyncResult appendResult = rtbTrace.BeginInvoke(new Action(() =>
{
foreach (string message in messages)
{
if (_stopTracePage)
{
break;
}
AddTraceMessage(message);
}
}));
Thread.Sleep(1);
}
if (action == PagingAction.Previous)
{
_currentPageTopOffset = MemoryMappedLog.TraceReader.NextReadOffset;
}
else
{
_currentPageBottomOffset = MemoryMappedLog.TraceReader.NextReadOffset;
}
}
