/// <summary>
/// Begins asynchronous processing of a single <see cref="T:MySpace.DataRelay.RelayMessage"/>.
/// </summary>
/// <param name="message">The <see cref="T:MySpace.DataRelay.RelayMessage"/>.</param>
/// <param name="state">Callers can put any state they like here.</param>
/// <param name="callback">The method to call upon completion.</param>
/// <returns>
/// Returns an <see cref="T:System.IAsyncResult"/>.
/// </returns>
public IAsyncResult BeginHandleMessage(RelayMessage message, object state, AsyncCallback callback)
{
if (!message.IsTwoWayMessage)
{
// cheat for now and just handle in messages synchronously
// as long as the type doesn't use sync in messages then
// we won't block on IO anyway.
HandleMessage(message);
return(SynchronousAsyncResult.CreateAndComplete(callback, state));
}
SimpleLinkedList <Node> nodes = PrepareMessage(message, false);
Node node;
if (nodes.Pop(out node))
{
var result = new AsynchronousResult <Node>((ar, n, m) =>
{
n.EndHandleOutMessage(ar);
int allowedRetries = NodeManager.Instance.GetRetryCountForMessage(message);
while (message.ErrorType == RelayErrorType.NodeUnreachable && --allowedRetries >= 0)
{
if (PrepareMessage(message, true).Pop(out node))
{
node.HandleOutMessage(message);
}
else
{
message.SetError(RelayErrorType.NoNodesAvailable);
}
}
}, node, message);
var origCallback = callback;
if (callback != null)
{
callback = ar =>
{
result.InnerResult = ar;
origCallback(result);
};
}
result.InnerResult = node.BeginHandleOutMessage(message, callback, state);
return(result);
}
else
{
message.SetError(RelayErrorType.NoNodesAvailable);
}
return(SynchronousAsyncResult.CreateAndComplete(callback, state));
}
/// <summary>
/// Begins asynchronous processing of a single <see cref="T:MySpace.DataRelay.RelayMessage"/>.
/// </summary>
/// <param name="message">The <see cref="T:MySpace.DataRelay.RelayMessage"/>.</param>
/// <param name="state">Callers can put any state they like here.</param>
/// <param name="callback">The method to call upon completion.</param>
/// <returns>
/// Returns an <see cref="T:System.IAsyncResult"/>.
/// </returns>
public virtual IAsyncResult BeginHandleMessage(RelayMessage message, object state, AsyncCallback callback)
{
if (!message.IsTwoWayMessage)
{
// cheat for now and just handle in messages synchronously
// as long as the type doesn't use sync in messages then
// we won't block on IO anyway.
HandleMessage(message);
return(SynchronousAsyncResult.CreateAndComplete(callback, state));
}
LinkedListStack <Node> nodes = PrepareMessage(message);
Node node;
if (nodes.Pop(out node))
{
var result = new AsynchronousResult <Node>((ar, n, m) =>
{
try
{
n.EndHandleOutMessage(ar);
RetryHandleMessageOnError(message, node);
}
catch (Exception ex)
{
log.Error(ex);
}
}, node, message);
var origCallback = callback;
if (callback != null)
{
callback = ar =>
{
result.InnerResult = ar;
origCallback(result);
};
}
result.InnerResult = node.BeginHandleOutMessage(message, callback, state);
return(result);
}
message.SetError(RelayErrorType.NoNodesAvailable);
return(SynchronousAsyncResult.CreateAndComplete(callback, state));
}
/// <summary>
/// Begins asynchronous processing of a <see cref="T:System.Collections.Generic.List`1"/> of <see cref="T:MySpace.DataRelay.RelayMessage"/>s.
/// </summary>
/// <param name="messages">The list of <see cref="T:MySpace.DataRelay.RelayMessage"/>s.</param>
/// <param name="state">Callers can put any state they like here.</param>
/// <param name="callback">The method to call upon completion.</param>
/// <returns>
/// Returns an <see cref="T:System.IAsyncResult"/>.
/// </returns>
/// <remarks>
/// <para>This method simply redirects to the synchronous <see cref="HandleMessages"/> method for now.
/// In the future this may change if we have compelling use-cases for making bulk message handling asynchronous.</para>
/// </remarks>
IAsyncResult IAsyncDataHandler.BeginHandleMessages(IList <RelayMessage> messages, object state, AsyncCallback callback)
{
// cheat and handle lists synchronously for now
HandleMessages(messages);
return(SynchronousAsyncResult.CreateAndComplete(callback, state));
}