[SNMP4J] SNMP Async Method call

[Smith, Ryan]

Included below is the code to reproduce the behavior I am describing.
If you run this example, the main thread dies but the async send() call
keeps the application from exiting.
How do I tell the async thread that is hanging there to end gracefully?

(ps - you can use this code to update the example on :
http://www.snmp4j.org/doc/org/snmp4j/Snmp.html 
since sendPDU() doesn't exist anymore. )

-Ryan

///////////////////////////////////////////////////

import java.io.IOException;

import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
import org.snmp4j.TransportMapping;
import org.snmp4j.event.ResponseEvent;
import org.snmp4j.event.ResponseListener;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.smi.Address;
import org.snmp4j.smi.GenericAddress;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;

public class SnmpAsyncExample {
	
	public static void main(String...args) throws IOException {
		/** our mode of transport for these snmp messages (udp).
*/
		TransportMapping transport = new
DefaultUdpTransportMapping();

		/** The snmp class from snmp4j. */
		Snmp snmp = new Snmp(transport);
		
		Address targetAddress =
GenericAddress.parse("udp:127.0.0.1/162");
		
		//An asynchronous SNMPv1 request is sent by the
following code:
	    // setting up target
		CommunityTarget target = new CommunityTarget();
		target.setCommunity(new OctetString("public"));
		target.setAddress(targetAddress);
		target.setRetries(2);
		target.setTimeout(1500);
		target.setVersion(SnmpConstants.version1);
		// creating PDU
		PDU pdu = new PDU();
		pdu.add(new VariableBinding(new OID(new int[]
{1,3,6,1,2,1,1,1})));
		pdu.add(new VariableBinding(new OID(new int[]
{1,3,6,1,2,1,1,2})));
		pdu.setType(PDU.GETNEXT);
		// sending request
		ResponseListener listener = new ResponseListener() {
		    public void onResponse(ResponseEvent event) {
		    // Always cancel async request when response has
been received
		    // otherwise a memory leak is created! Not canceling
a request
		    // immediately can be useful when sending a request
to a broadcast
		    // address.
		    ((Snmp)event.getSource()).cancel(event.getRequest(),
this);
		    System.out.println("Received response PDU is:
"+event.getResponse());
		    }
		};
		snmp.send(pdu, target, null, listener);
		System.out.println("Main thread is exiting...");
	}		
	
} 

///////////////////////////////////////////////////////////

Ryan Smith 
1625 South Congress Ave. 
Suite 200 
Delray Beach, FL 33445 
Tel:(561) 454-7600 
www.shsolutions.com <http://www.shsolutions.com/>