[SNMP4J] TCP Port not closed when invoked transport.close method

[Frank Fock]

Hi Vijay,

Depending on your operating system TCP ports may
not immediately be available for reuse. See
http://java.sun.com/j2se/1.5.0/docs/api/java/net/Socket.html#setReuseAddress(boolean)
for an explanation.

To allow immediate reuse, you will have to implement
your own TCPTransportMapping.

I will provide a hookup-method to allow setting socket
options by extending the default mappings.

Best regards,
Frank

Vijay Reddy (dvsreddy) wrote:
> Hi,
>  
> Am trying to write SNMP TCP Trap receiver program. Am able to receive
> traps, but when tried to close the connection,  still the TCP port is
> listening mode.
>  
>  
> Can you please let me know if anything wrong in my code as provide
> below, Am working in Eclipse IDE, port is released only when closing the
> Eclipse IDE.
>  
>  
> private synchronized void listen(IPAddress receiverIp , int
> connectionType, int dest_port ) throws IOException, InterruptedException
> {
> 
> String sourceIp = receiverIp.getIPAddress()+ "/"+dest_port; 
> 
> Snmp snmp = null; 
> 
> if (connectionType == TrapConstants.TCP) {
> 
> transport = new DefaultTcpTransportMapping(new TcpAddress(sourceIp));
> 
> } else { 
> 
> transport = new DefaultUdpTransportMapping(new UdpAddress(sourceIp));
> 
> }
> 
> ThreadPool threadPool =
> 
> ThreadPool.create("DispatcherPool", NUMBER_OF_THREADS);
> 
> MessageDispatcher mtDispatcher =
> 
> new MultiThreadedMessageDispatcher(threadPool, new
> MessageDispatcherImpl()); 
> 
> mtDispatcher.addMessageProcessingModel(new MPv2c()); 
> 
> snmp = new Snmp(mtDispatcher, transport); 
> 
> snmp.addCommandResponder(this);
> 
> transport.listen();
> 
> LogManager.getTextLog().debug("Listening on "+sourceIp); 
> 
> }
> 
> public synchronized void processPdu(CommandResponderEvent event) {
> 
> PDU command = event.getPDU(); 
> 
> if (command != null) { 
> 
> receivedEventList.add(command);
> 
> }
> 
> }
> 
> public void close() throws IOException {
> 
> transport.close();   // Call is successfull  but doesn't release the
> port immediately.
> 
> }
> 
>  
>  
>  
> Thanks and regards,
> Vijay
> _______________________________________________
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> SNMP4J at agentpp.org
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