private void Worker_DoWork(object sender, DoWorkEventArgs e)
{
LogUpdateRequest request = (LogUpdateRequest)e.Argument;
request.LogContents = logReader.ReadLog(request.LogFileName);
e.Result = request;
}
private void CreateWorkerThread(LogUpdateRequest request)
{
BackgroundWorker worker = new BackgroundWorker();
worker.DoWork += new DoWorkEventHandler(Worker_DoWork);
worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(Worker_RunWorkerCompleted);
worker.WorkerSupportsCancellation = false;
worker.RunWorkerAsync(request);
}
private void Worker_RunWorkerCompleted(object sender, RunWorkerCompletedEventArgs e)
{
LogUpdateRequest request = (LogUpdateRequest)e.Result;
lock (this)
{
int removedRequests = queuedRequests.RemoveAll(
r => String.Equals(r.LogFileName, request.LogFileName, StringComparison.OrdinalIgnoreCase));
Debug.Assert(removedRequests == 1, "The request was not removed from the queue.");
}
request.LogContentsFetchedCallback(request);
((BackgroundWorker)sender).Dispose();
}
public void FetchLogContents(string logFileName, LogContentsFetchedCallback logContentsFetchedCallback)
{
lock (this)
{
// if the log file is already queued, but not yet in processing
LogUpdateRequest existingRequest = queuedRequests.Find(r => String.Equals(r.LogFileName, logFileName, StringComparison.OrdinalIgnoreCase));
if (existingRequest != null)
{
// we ignore the new request, since the old one is already being processed
}
else
{
LogUpdateRequest logUpdateRequest = new LogUpdateRequest(logFileName, logContentsFetchedCallback);
queuedRequests.Add(logUpdateRequest);
CreateWorkerThread(logUpdateRequest);
}
}
}