public void StartListening()
{
//UPD broadcast client
m_discoveryClient = new UdpClient(JobTransmitter.m_discoveryPortHerd);
HerdAgentUdpState state = new HerdAgentUdpState();
IPEndPoint shepherd = new IPEndPoint(0, 0);
state.ip = shepherd;
// state.herdAgent = this;
m_discoveryClient.BeginReceive(DiscoveryCallback, state);
//TCP communication socket
m_listener = new TcpListener(IPAddress.Any, JobTransmitter.m_comPortHerd);
m_listener.Start();
HerdAgentTcpState tcpState = new HerdAgentTcpState();
tcpState.ip = shepherd;
m_listener.BeginAcceptTcpClient(CommunicationCallback, tcpState);
}
public async void CommunicationCallback(IAsyncResult ar)
{
if (State != AgentState.Busy)
{
LogMessage("Receiving job");
AcceptJobQuery(ar);
try
{
State = AgentState.Busy;
int ret = await ReadAsync(m_cancelTokenSource.Token);
string xmlItem = m_xmlStream.processNextXMLItem();
string xmlItemContent;
int returnCode;
if (xmlItem != "")
{
xmlItemContent = m_xmlStream.getLastXMLItemContent();
if (xmlItemContent == JobTransmitter.m_acquireMessage)
{
LogMessage("Receiving job data from "
+ m_tcpClient.Client.RemoteEndPoint.ToString());
bool bret = await ReceiveJobQuery(m_cancelTokenSource.Token);
if (bret)
{
//run the job
LogMessage("Job received");
LogMessage(m_job.ToString());
LogMessage("Running job");
returnCode = await RunJobAsync(m_cancelTokenSource.Token);
if (returnCode == m_noErrorCode || returnCode == m_jobInternalErrorCode)
{
LogMessage("Job finished. Code=" + returnCode);
await WriteMessageAsync(JobTransmitter.m_endMessage, m_cancelTokenSource.Token, true);
LogMessage("Sending job results");
//we will have to enqueue async write operations to wait for them to finish before closing the tcpClient
StartEnqueueingAsyncWriteOps();
SendJobResult(m_cancelTokenSource.Token);
LogMessage("Job results sent");
}
else if (returnCode == m_remotelyCancelledErrorCode)
{
LogMessage("The job was remotely cancelled");
WriteMessage(JobTransmitter.m_errorMessage, false);
}
}
}
}
}
catch (Exception ex)
{
LogMessage("Unhandled exception in the herd agent's communication callback function");
LogMessage(ex.ToString() + ex.InnerException + ex.StackTrace);
}
finally
{
LogMessage("Waiting for queued async write operations to finish");
waitAsyncWriteOpsToFinish();
LogMessage("Closing the TCP connection");
m_tcpClient.Close();
State = AgentState.Available;
//try to recover
//start listening again
HerdAgentTcpState tcpState = new HerdAgentTcpState();
tcpState.ip = new IPEndPoint(0, 0);
m_listener.BeginAcceptTcpClient(CommunicationCallback, tcpState);
}
}
}