/// <summary>
/// Called by serial receive dispatcher and resolve the waiting items
/// </summary>
/// <param name="message"></param>
public void FeedMessage(string message)
{
//separate the prefix
//locate the awaiting task
//release the task with message
//if no message is registered, abadon this message and throw a warning
var tokens = message.Split(' ');
var prefix = tokens[0];
var msgbody = String.Join(" ", tokens.Skip(1)).Trim();
lock (_poolLock)
{
QueuedResponseHandler foundItem = null;
try
{
foundItem = _pool.Where(handler => handler.Identifier == prefix).First();
}
catch (Exception e)
{
// ignored
}
if (foundItem != null)
{
// resolve the target
foundItem.MessageBody = msgbody;
foundItem.Signal.Set();
}
}
}
/// <summary>
/// This sync function ensure the message is successfully queued into the buffer
/// </summary>
/// <param name="responsePrefix"></param>
/// <param name="timeout"></param>
public QueuedResponseHandler RegisterAwaiter(string responsePrefix)
{
var item = new QueuedResponseHandler()
{
Identifier = responsePrefix,
Signal = new ManualResetEvent(false)
};
lock (_poolLock)
{
_pool.Add(item);
}
return(item);
}
public Task <string> WaitForResultAsync(QueuedResponseHandler item, int timeout = 1000)
{
return(Task.Run(() =>
{
var triggered = item.Signal.WaitOne(timeout);
lock (_poolLock)
{
_pool.Remove(item);
}
if (!triggered)
{
throw new TimeoutException($"Wait for result of command {item.Identifier} time out");
}
return Task.FromResult(item.MessageBody);
}));
}
