/// <summary>
/// Clears all pending requests, and waits for any active request to complete
/// </summary>
public void Dispose()
{
IAsyncResult resultReply = null;
KeyValuePair <WaitCallback, object>?originalRequest = null;
lock (_syncLock)
{
if (_requests != null)
{
if (_requests.Count > 0)
{
originalRequest = _requests.Dequeue();
}
_requests.Clear();
_requests = null;
}
resultReply = _pendingReplyResult;
_pendingReplyResult = null;
}
if (originalRequest != null && resultReply == null)
{
// We need to wait for the request to complete
while (originalRequest != null)
{
System.Threading.Thread.Sleep(10);
lock (_syncLock)
{
if (_pendingReplyResult != null)
{
originalRequest = null;
resultReply = _pendingReplyResult;
_pendingReplyResult = null;
}
}
}
}
if (resultReply != null)
{
try
{
WaitCallback action = resultReply.AsyncState as WaitCallback;
action.EndInvoke(resultReply);
}
catch
{
}
}
}
/// <summary>
/// Checks the result of the last request, and starts execution of the next pending request
/// </summary>
public object CheckResult()
{
KeyValuePair <WaitCallback, object>?nextPendingRequest = null;
KeyValuePair <WaitCallback, object>?originalRequest = null;
IAsyncResult resultReply = null;
lock (_syncLock)
{
if (_requests == null)
{
return(null); // Has been disposed
}
if (_pendingReplyResult != null)
{
resultReply = _pendingReplyResult;
originalRequest = _requests.Dequeue();
if (_requests.Count > 0)
{
nextPendingRequest = _requests.Peek();
}
_pendingReplyResult = null;
}
}
if (nextPendingRequest.HasValue)
{
nextPendingRequest.Value.Key.BeginInvoke(nextPendingRequest.Value.Value, RequestCallback, nextPendingRequest.Value.Key);
}
if (resultReply != null)
{
WaitCallback action = resultReply.AsyncState as WaitCallback;
action.EndInvoke(resultReply); // Can throw if any pending exception
}
if (originalRequest.HasValue)
{
return(originalRequest.Value.Value);
}
else
{
return(null);
}
}
/// <summary>
/// Implements <see cref="IBackgroundDispatcher.EndInvoke(IAsyncResult)" />.
/// </summary>
public void EndInvoke(IAsyncResult asyncResult)
{
_invokerWaitCallback.EndInvoke(asyncResult);
}