public Relay Sync(int timeout = Timeout.Infinite)
{
log.Debug("synchronize processes");
log.Debug("clear stop and sync events and clear ports exceptions");
stop.Reset();
sync.Reset();
portsExceptions = new List <Exception>();
string message = new JObject(new JProperty("sync", true)).ToString(Formatting.None);
log.DebugFormat("sync message\n{0}", message);
log.Debug("begin asynchronous write port B");
portB.BeginWrite(message, delegate(IAsyncResult _ar) { ((Relay)_ar.AsyncState).SyncWriteCallback(_ar); }, this);
log.DebugFormat("wait for stop event (timeout={0})", timeout);
if (!stop.WaitOne(timeout))
{
throw new TimeoutException("Processes synchronization timeout.");
}
log.Debug("stop event");
log.Debug("check ports exceptions");
if (portsExceptions.Count > 0)
{
log.Debug("generate aggregated exception");
throw new AggregateException(portsExceptions);
}
log.Debug("check sync event");
if (!sync.WaitOne(0))
{
throw new SynchronizationException();
}
log.Debug("processes are synchronized");
return(this);
}
private void SyncReadCallback(IAsyncResult ar)
{
try
{
log.Debug("end asynchronous read port");
string message = port.EndRead(ar);
log.DebugFormat("received message\n{0}", message);
log.Debug("begin asynchronous write port");
port.BeginWrite(message, delegate(IAsyncResult _ar) { ((Scan)_ar.AsyncState).SyncWriteCallback(_ar); }, this);
}
catch (Exception ex)
{
log.Error("unhandled exception port", ex);
portException = ex;
stop.Set();
}
}
private void ReadPortBCallback(IAsyncResult ar)
{
log.Debug("read port B callback");
try
{
string message = portB.EndRead(ar);
log.DebugFormat("received message\n{0}", message);
if (!stop.WaitOne(0))
{
try
{
log.Debug("start asynchronous write port A");
portA.BeginWrite(message, delegate(IAsyncResult _ar) { ((Relay)_ar.AsyncState).WritePortACallback(_ar); }, this);
}
catch (Exception ex)
{
log.Error("unhandled exception port A", ex);
portsExceptions.Add(ex);
stop.Set();
}
}
else
{
log.Debug("stop signalled");
}
}
catch (EndOfInputStreamException)
{
log.Debug("end of native messages stream port B");
stop.Set();
}
catch (Exception ex)
{
log.Error("unhandled exception port B", ex);
portsExceptions.Add(ex);
stop.Set();
}
}
