SNMP4J 异步获取数据 GETBULK

package com.sdstc.maxvalue.nms.services.cheng;


import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;


import org.snmp4j.CommunityTarget;
import org.snmp4j.PDU;
import org.snmp4j.Snmp;
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.Integer32;
import org.snmp4j.smi.Null;
import org.snmp4j.smi.OID;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.VariableBinding;
import org.snmp4j.transport.DefaultUdpTransportMapping;


/**
 * 演示：异步GET OID值
 *
 * blog http://www.micmiu.com
 *
 * @author Michael
 *
 */
public class SnmpWalkAsyn {


public static final int DEFAULT_VERSION = SnmpConstants.version2c;
public static final String DEFAULT_PROTOCOL = "udp";
public static final int DEFAULT_PORT = 161;
public static final long DEFAULT_TIMEOUT = 3 * 1000L;
public static final int DEFAULT_RETRY = 3;


/**
* 创建对象communityTarget
*
* @param targetAddress
* @param community
* @param version
* @param timeOut
* @param retry
* @return CommunityTarget
*/
public static CommunityTarget createDefault(String ip, String community) {
Address address = GenericAddress.parse(DEFAULT_PROTOCOL + ":" + ip + "/" + DEFAULT_PORT);
CommunityTarget target = new CommunityTarget();
target.setCommunity(new OctetString(community));
target.setAddress(address);
target.setVersion(DEFAULT_VERSION);
target.setTimeout(DEFAULT_TIMEOUT); // milliseconds
target.setRetries(DEFAULT_RETRY);
return target;
}


/**
* 异步采集信息
*
* @param ip
* @param community
* @param oid
*/
public static void snmpAsynWalk(String ip, String community, String oid) {
final CommunityTarget target = createDefault(ip, community);
Snmp snmp = null;
try {
System.out.println("----> demo start <----");


DefaultUdpTransportMapping transport = new DefaultUdpTransportMapping();
snmp = new Snmp(transport);
snmp.listen();


final PDU pdu = new PDU();
final OID targetOID = new OID(oid);
final CountDownLatch latch = new CountDownLatch(1);
pdu.add(new VariableBinding(targetOID));
            pdu.setType(PDU.GETBULK);
            pdu.setMaxRepetitions(Integer.MAX_VALUE);
pdu.setNonRepeaters(0);

ResponseListener listener = new ResponseListener() {
public void onResponse(ResponseEvent event) {
((Snmp) event.getSource()).cancel(event.getRequest(), this);


try {
PDU response = event.getResponse();
// PDU request = event.getRequest();
// System.out.println("[request]:" + request);
if (response == null) {
System.out.println("[ERROR]: response is null");
} else if (response.getErrorStatus() != 0) {
System.out.println("[ERROR]: response status" + response.getErrorStatus() + " Text:" + response.getErrorStatusText());
} else {
System.out.println("Received Walk response value :");
VariableBinding vb = response.get(0);


boolean finished = checkWalkFinished(targetOID, pdu, vb);
if (!finished) {
System.out.println(vb.getOid() + " = " + vb.getVariable());
pdu.setRequestID(new Integer32(0));
pdu.set(0, vb);
((Snmp) event.getSource()).getNext(pdu, target, null, this);
} else {
System.out.println("SNMP Asyn walk OID value success !");
latch.countDown();
}
}
} catch (Exception e) {
e.printStackTrace();
latch.countDown();
}


}
};


snmp.getNext(pdu, target, null, listener);
System.out.println("pdu 已发送,等到异步处理结果...");


boolean wait = latch.await(30, TimeUnit.SECONDS);
System.out.println("latch.await =:" + wait);
snmp.close();


System.out.println("----> demo end <----");
} catch (Exception e) {
e.printStackTrace();
System.out.println("SNMP Asyn Walk Exception:" + e);
}


}


private static boolean checkWalkFinished(OID walkOID, PDU pdu, VariableBinding vb) {
boolean finished = false;
if (pdu.getErrorStatus() != 0) {
System.out.println("[true] pdu.getErrorStatus() != 0 ");
System.out.println(pdu.getErrorStatusText());
finished = true;
} else if (vb.getOid() == null) {
System.out.println("[true] vb.getOid() == null");
finished = true;
} else if (vb.getOid().size() < walkOID.size()) {
System.out.println("[true] vb.getOid().size() < targetOID.size()");
finished = true;
} else if (walkOID.leftMostCompare(walkOID.size(), vb.getOid()) != 0) {
System.out.println("[true] targetOID.leftMostCompare() != 0");
finished = true;
} else if (Null.isExceptionSyntax(vb.getVariable().getSyntax())) {
System.out.println("[true] Null.isExceptionSyntax(vb.getVariable().getSyntax())");
finished = true;
} else if (vb.getOid().compareTo(walkOID) <= 0) {
System.out.println("[true] vb.getOid().compareTo(walkOID) <= 0 ");
finished = true;
}
return finished;


}


/**
*
* @param args
*/
public static void main(String[] args) {


String ip = "172.16.5.182";
String community = "public";


List<String> oidList = new ArrayList<String>();
oidList.add(".1.3.6.1.2.1.1.1.0");
oidList.add(".1.3.6.1.2.1.1.3.0");
oidList.add(".1.3.6.1.2.1.1.5.0");
// 异步采集数据
SnmpWalkAsyn.snmpAsynWalk(ip, community, "1.3.6.1.2.1.25.3.2.1.3");


}
}