SDN之QoS--3:网络基础信息的测量（Floodlight）
来源：互联网 发布：已婚网友见面目的知乎 编辑：程序博客网 时间：2024/05/23 13:10
模块该部分承接上文，添加三个模块，来实现网络带宽使用、丢包率、链路时延等的测量。当然，读者也可以把他们三个木块合并，只是那样的话，每一个service就不单一了。
一、说在前面
一般来讲，我们在Floodlight中添加自定义的模块，最基础的需要实现以下两个步骤：
- 自定义一个interface,里面写上自定义的方法，当然，需要extends IFloodlightServcice.
- 自定义一个class,实现我们的那个interface,还需要实现IFloodlightModule。如果还需要处理OpenFlow消息还需要实现IOFMessageListener，其他类似；如果需要使用FL提供的线程池，那就需要添加改依赖。
在getModuleDependencies（）中添加接下来，我主要记录我们是如何采集到链路带宽使用情况，以及需要依赖那些service，另外两个模块与这个答题类似，就只贴上代码了。
二、链路带宽使用情况
定义的interface : IMonitorBandwidthService
public interface IMonitorBandwidthService extends IFloodlightService { //带宽使用情况 public Map<NodePortTuple,SwitchPortBandwidth> getBandwidthMap();}然后是定义的MonitorBandwidth
package aaa.net.floodlightcontroller.test;import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Map.Entry;import java.util.concurrent.ScheduledFuture;import java.util.concurrent.TimeUnit;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import net.floodlightcontroller.core.IFloodlightProviderService;import net.floodlightcontroller.core.internal.IOFSwitchService;import net.floodlightcontroller.core.module.FloodlightModuleContext;import net.floodlightcontroller.core.module.FloodlightModuleException;import net.floodlightcontroller.core.module.IFloodlightModule;import net.floodlightcontroller.core.module.IFloodlightService;import net.floodlightcontroller.statistics.IStatisticsService;import net.floodlightcontroller.statistics.StatisticsCollector;import net.floodlightcontroller.statistics.SwitchPortBandwidth;import net.floodlightcontroller.threadpool.IThreadPoolService;import net.floodlightcontroller.topology.NodePortTuple;/** * 带宽获取模块 * @author xjtu * */public class MonitorBandwidth implements IFloodlightModule,IMonitorBandwidthService{ //日志工具 private static final Logger log = LoggerFactory.getLogger(StatisticsCollector.class); //Floodlight最核心的service类，其他service类需要该类提供 protected static IFloodlightProviderService floodlightProvider; //链路数据分析模块，已经由Floodlight实现了，我们只需要调用一下就可以，然后对结果稍做加工，便于我们自己使用 protected static IStatisticsService statisticsService; //Floodllight实现的线程池，当然我们也可以使用Java自带的，但推荐使用这个 private static IThreadPoolService threadPoolService; //Future类，不明白的可以百度 Java现成future,其实C++11也有这个玩意了 private static ScheduledFuture<?> portBandwidthCollector; //交换机相关的service,通过这个服务，我们可以获取所有的交换机，即DataPath private static IOFSwitchService switchService; //存放每条俩路的带宽使用情况 private static Map<NodePortTuple,SwitchPortBandwidth> bandwidth; //搜集数据的周期 private static final int portBandwidthInterval = 4; //告诉FL，我们添加了一个模块，提供了IMonitorBandwidthService @Override public Collection<Class<? extends IFloodlightService>> getModuleServices() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); l.add(IMonitorBandwidthService.class); return l; } //我们前面声明了几个需要使用的service,在这里说明一下实现类 @Override public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() { Map<Class<? extends IFloodlightService>, IFloodlightService> m = new HashMap<Class<? extends IFloodlightService>, IFloodlightService>(); m.put(IMonitorBandwidthService.class, this); return m; } //告诉FL我们以来那些服务，以便于加载 @Override public Collection<Class<? extends IFloodlightService>> getModuleDependencies() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); l.add(IFloodlightProviderService.class); l.add(IStatisticsService.class); l.add(IOFSwitchService.class); l.add(IThreadPoolService.class); return l; } //初始化这些service,个人理解这个要早于startUp()方法的执行，验证很简单，在两个方法里打印当前时间就可以。 @Override public void init(FloodlightModuleContext context) throws FloodlightModuleException { floodlightProvider = context.getServiceImpl(IFloodlightProviderService.class); statisticsService = context.getServiceImpl(IStatisticsService.class); switchService = context.getServiceImpl(IOFSwitchService.class); threadPoolService = context.getServiceImpl(IThreadPoolService.class); } @Override public void startUp(FloodlightModuleContext context) throws FloodlightModuleException { startCollectBandwidth(); } //自定义的开始收集数据的方法，使用了线程池，定周期的执行 private synchronized void startCollectBandwidth(){ portBandwidthCollector = threadPoolService.getScheduledExecutor().scheduleAtFixedRate(new GetBandwidthThread(), portBandwidthInterval, portBandwidthInterval, TimeUnit.SECONDS); log.warn("Statistics collection thread(s) started"); } //自定义的线程类，在上面的方法中实例化，并被调用 /** * Single thread for collecting switch statistics and * containing the reply. */ private class GetBandwidthThread extends Thread implements Runnable { private Map<NodePortTuple,SwitchPortBandwidth> bandwidth; public Map<NodePortTuple, SwitchPortBandwidth> getBandwidth() { return bandwidth; }// public void setBandwidth(Map<NodePortTuple, SwitchPortBandwidth> bandwidth) {// this.bandwidth = bandwidth;// } @Override public void run() { System.out.println("GetBandwidthThread run()...."); bandwidth =getBandwidthMap(); System.out.println("bandwidth.size():"+bandwidth.size()); } } /** * 获取带宽使用情况 * 需要简单的换算 根据 switchPortBand.getBitsPerSecondRx().getValue()/(8*1024) + switchPortBand.getBitsPerSecondTx().getValue()/(8*1024) 计算带宽 */ public Map<NodePortTuple,SwitchPortBandwidth> getBandwidthMap(){ bandwidth = statisticsService.getBandwidthConsumption();// // for(NodePortTuple tuple:bandwidth.keySet()){// System.out.println(tuple.getNodeId().toString()+","+tuple.getPortId().getPortNumber());// System.out.println();// } Iterator<Entry<NodePortTuple,SwitchPortBandwidth>> iter = bandwidth.entrySet().iterator(); while (iter.hasNext()) { Entry<NodePortTuple,SwitchPortBandwidth> entry = iter.next(); NodePortTuple tuple = entry.getKey(); SwitchPortBandwidth switchPortBand = entry.getValue(); System.out.print(tuple.getNodeId()+","+tuple.getPortId().getPortNumber()+","); System.out.println(switchPortBand.getBitsPerSecondRx().getValue()/(8*1024) + switchPortBand.getBitsPerSecondTx().getValue()/(8*1024)); } return bandwidth; }}三、链路丢包率统计
import net.floodlightcontroller.core.module.IFloodlightService;public interface IMonitorPkLossService extends IFloodlightService {// public Map<> getPkLoss(Object o1,Object o2);}package aaa.net.floodlightcontroller.test;import java.lang.Thread.State;import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Set;import java.util.Map.Entry;import java.util.concurrent.ScheduledFuture;import java.util.concurrent.TimeUnit;import org.projectfloodlight.openflow.protocol.OFMessage;import org.projectfloodlight.openflow.protocol.OFPortStatsEntry;import org.projectfloodlight.openflow.protocol.OFPortStatsReply;import org.projectfloodlight.openflow.protocol.OFStatsReply;import org.projectfloodlight.openflow.protocol.OFStatsRequest;import org.projectfloodlight.openflow.protocol.OFStatsType;import org.projectfloodlight.openflow.protocol.OFType;import org.projectfloodlight.openflow.protocol.OFVersion;import org.projectfloodlight.openflow.protocol.match.Match;import org.projectfloodlight.openflow.protocol.ver13.OFMeterSerializerVer13;import org.projectfloodlight.openflow.types.DatapathId;import org.projectfloodlight.openflow.types.OFPort;import org.projectfloodlight.openflow.types.TableId;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import com.google.common.primitives.UnsignedLong;import com.google.common.util.concurrent.ListenableFuture;import net.floodlightcontroller.core.FloodlightContext;import net.floodlightcontroller.core.IFloodlightProviderService;import net.floodlightcontroller.core.IOFMessageListener;import net.floodlightcontroller.core.IOFSwitch;import net.floodlightcontroller.core.internal.IOFSwitchService;import net.floodlightcontroller.core.module.FloodlightModuleContext;import net.floodlightcontroller.core.module.FloodlightModuleException;import net.floodlightcontroller.core.module.IFloodlightModule;import net.floodlightcontroller.core.module.IFloodlightService;import net.floodlightcontroller.statistics.IStatisticsService;import net.floodlightcontroller.statistics.StatisticsCollector;import net.floodlightcontroller.threadpool.IThreadPoolService;import net.floodlightcontroller.topology.NodePortTuple;/** * 获取丢包率模块 * @author xjtu * */public class MonitorPkLoss implements IMonitorPkLossService,IFloodlightModule,IOFMessageListener { private static final Logger log = LoggerFactory.getLogger(StatisticsCollector.class); private static HashMap<NodePortTuple, Long> DPID_PK_LOSS = new HashMap<NodePortTuple, Long>(); protected static IFloodlightProviderService floodlightProvider; protected static IStatisticsService statisticsService; private static IOFSwitchService switchService; private static IThreadPoolService threadPoolService; private static ScheduledFuture<?> portStatsCollector; private static int portStatsInterval = 4; @Override public Collection<Class<? extends IFloodlightService>> getModuleServices() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); l.add(IMonitorPkLossService.class); return l; } @Override public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() { Map<Class<? extends IFloodlightService>, IFloodlightService> m = new HashMap<Class<? extends IFloodlightService>, IFloodlightService>(); m.put(IMonitorPkLossService.class, this); return m; } @Override public Collection<Class<? extends IFloodlightService>> getModuleDependencies() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); l.add(IFloodlightProviderService.class); l.add(IStatisticsService.class); l.add(IOFSwitchService.class); l.add(IThreadPoolService.class); return l; } @Override public void init(FloodlightModuleContext context) throws FloodlightModuleException { floodlightProvider = context.getServiceImpl(IFloodlightProviderService.class); statisticsService = context.getServiceImpl(IStatisticsService.class); switchService = context.getServiceImpl(IOFSwitchService.class); threadPoolService = context.getServiceImpl(IThreadPoolService.class); } @Override public void startUp(FloodlightModuleContext context) throws FloodlightModuleException { floodlightProvider.addOFMessageListener(OFType.PACKET_IN, this); startStatisticsCollection(); } @Override public String getName() { return "monitorpkloss"; } @Override public boolean isCallbackOrderingPrereq(OFType type, String name) { return false; } @Override public boolean isCallbackOrderingPostreq(OFType type, String name) { return false; } @Override public Command receive(IOFSwitch sw, OFMessage msg,FloodlightContext cntx) {// Ethernet eth = IFloodlightProviderService.bcStore.get(cntx, IFloodlightProviderService.CONTEXT_PI_PAYLOAD);// Long sourceMACHash = eth.getSourceMACAddress().getLong();// OFFactory factory = sw.getOFFactory(); /** * 获取丢包率 */// if(msg.getType() == OFType.STATS_REPLY){// OFStatsReply reply = (OFStatsReply) msg;// OFPortStatsReply psr = (OFPortStatsReply) reply;// OFPortStatsEntry pse = (OFPortStatsEntry) psr;// System.out.println("rx bytes:"+pse.getRxBytes().getValue());// System.out.println("rx_dropped bytes:"+pse.getRxDropped().getValue());// System.out.println("tx bytes:"+pse.getTxBytes().getValue());// System.out.println("tx_dropped bytes:"+pse.getTxDropped().getValue());// } return Command.CONTINUE; } /** * Start all stats threads. */ private synchronized void startStatisticsCollection() { portStatsCollector = threadPoolService.getScheduledExecutor().scheduleAtFixedRate(new PortStatsCollector(), portStatsInterval, portStatsInterval, TimeUnit.SECONDS); log.warn("Statistics collection thread(s) started"); } /** * Single thread for collecting switch statistics and * containing the reply. */ private class GetStatisticsThread extends Thread { private List<OFStatsReply> statsReply; private DatapathId switchId; private OFStatsType statType; public GetStatisticsThread(DatapathId switchId, OFStatsType statType) { this.switchId = switchId; this.statType = statType; this.statsReply = null; } public List<OFStatsReply> getStatisticsReply() { return statsReply; } public DatapathId getSwitchId() { return switchId; } @Override public void run() {// System.out.println("run............"); statsReply = getSwitchStatistics(switchId, statType); } } /** * Get statistics from a switch. * @param switchId * @param statsType * @return */ @SuppressWarnings("unchecked") protected List<OFStatsReply> getSwitchStatistics(DatapathId switchId, OFStatsType statsType) { IOFSwitch sw = switchService.getSwitch(switchId);// System.out.println("getSwitchStatistics............"); ListenableFuture<?> future; List<OFStatsReply> values = null; Match match; if (sw != null) { OFStatsRequest<?> req = null; switch (statsType) { case FLOW: match = sw.getOFFactory().buildMatch().build(); req = sw.getOFFactory().buildFlowStatsRequest() .setMatch(match) .setOutPort(OFPort.ANY) .setTableId(TableId.ALL) .build(); break; case AGGREGATE: match = sw.getOFFactory().buildMatch().build(); req = sw.getOFFactory().buildAggregateStatsRequest() .setMatch(match) .setOutPort(OFPort.ANY) .setTableId(TableId.ALL) .build(); break; case PORT: req = sw.getOFFactory().buildPortStatsRequest() .setPortNo(OFPort.ANY) .build(); break; case QUEUE: req = sw.getOFFactory().buildQueueStatsRequest() .setPortNo(OFPort.ANY) .setQueueId(UnsignedLong.MAX_VALUE.longValue()) .build(); break; case DESC: req = sw.getOFFactory().buildDescStatsRequest() .build(); break; case GROUP: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_10) > 0) { req = sw.getOFFactory().buildGroupStatsRequest() .build(); } break; case METER: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_13) >= 0) { req = sw.getOFFactory().buildMeterStatsRequest() .setMeterId(OFMeterSerializerVer13.ALL_VAL) .build(); } break; case GROUP_DESC: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_10) > 0) { req = sw.getOFFactory().buildGroupDescStatsRequest() .build(); } break; case GROUP_FEATURES: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_10) > 0) { req = sw.getOFFactory().buildGroupFeaturesStatsRequest() .build(); } break; case METER_CONFIG: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_13) >= 0) { req = sw.getOFFactory().buildMeterConfigStatsRequest() .build(); } break; case METER_FEATURES: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_13) >= 0) { req = sw.getOFFactory().buildMeterFeaturesStatsRequest() .build(); } break; case TABLE: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_10) > 0) { req = sw.getOFFactory().buildTableStatsRequest() .build(); } break; case TABLE_FEATURES: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_10) > 0) { req = sw.getOFFactory().buildTableFeaturesStatsRequest() .build(); } break; case PORT_DESC: if (sw.getOFFactory().getVersion().compareTo(OFVersion.OF_13) >= 0) { req = sw.getOFFactory().buildPortDescStatsRequest() .build(); } break; case EXPERIMENTER: default: log.error("Stats Request Type {} not implemented yet", statsType.name()); break; } try { if (req != null) { future = sw.writeStatsRequest(req); values = (List<OFStatsReply>) future.get(portStatsInterval / 2, TimeUnit.SECONDS); } } catch (Exception e) { log.error("Failure retrieving statistics from switch {}. {}", sw, e); } } return values; } /** * Retrieve the statistics from all switches in parallel. * @param dpids * @param statsType * @return */ private Map<DatapathId, List<OFStatsReply>> getSwitchStatistics(Set<DatapathId> dpids, OFStatsType statsType) { HashMap<DatapathId, List<OFStatsReply>> model = new HashMap<DatapathId, List<OFStatsReply>>(); List<GetStatisticsThread> activeThreads = new ArrayList<GetStatisticsThread>(dpids.size()); List<GetStatisticsThread> pendingRemovalThreads = new ArrayList<GetStatisticsThread>(); GetStatisticsThread t; for (DatapathId d : dpids) { t = new GetStatisticsThread(d, statsType); activeThreads.add(t); t.start(); } /* Join all the threads after the timeout. Set a hard timeout * of 12 seconds for the threads to finish. If the thread has not * finished the switch has not replied yet and therefore we won't * add the switch's stats to the reply. */ for (int iSleepCycles = 0; iSleepCycles < portStatsInterval; iSleepCycles++) { for (GetStatisticsThread curThread : activeThreads) { if (curThread.getState() == State.TERMINATED) { model.put(curThread.getSwitchId(), curThread.getStatisticsReply()); pendingRemovalThreads.add(curThread); } } /* remove the threads that have completed the queries to the switches */ for (GetStatisticsThread curThread : pendingRemovalThreads) { activeThreads.remove(curThread); } /* clear the list so we don't try to double remove them */ pendingRemovalThreads.clear(); /* if we are done finish early */ if (activeThreads.isEmpty()) { break; } try { Thread.sleep(1000); } catch (InterruptedException e) { log.error("Interrupted while waiting for statistics", e); } } return model; } /** * Run periodically to collect all port statistics. This only collects * bandwidth stats right now, but it could be expanded to record other * information as well. The difference between the most recent and the * current RX/TX bytes is used to determine the "elapsed" bytes. A * timestamp is saved each time stats results are saved to compute the * bits per second over the elapsed time. There isn't a better way to * compute the precise bandwidth unless the switch were to include a * timestamp in the stats reply message, which would be nice but isn't * likely to happen. It would be even better if the switch recorded * bandwidth and reported bandwidth directly. * * Stats are not reported unless at least two iterations have occurred * for a single switch's reply. This must happen to compare the byte * counts and to get an elapsed time. * */ private class PortStatsCollector implements Runnable { @Override public void run() {// System.out.println("Runnable run()...."); Map<DatapathId, List<OFStatsReply>> replies = getSwitchStatistics(switchService.getAllSwitchDpids(), OFStatsType.PORT);// System.out.println("replies.size():"+replies.size()); for (Entry<DatapathId, List<OFStatsReply>> e : replies.entrySet()) { for (OFStatsReply r : e.getValue()) { OFPortStatsReply psr = (OFPortStatsReply) r; for (OFPortStatsEntry pse : psr.getEntries()) {// System.out.println("dpid:"+e.getKey().toString());// System.out.println("for (OFPortStatsEntry pse : psr.getEntries())"); long pk_loss = 0; if(e.getKey().toString().equals("") || e.getKey() == null){// System.out.println("e.getKey() is null...."); }// System.out.println("--------------------------------------------"); NodePortTuple npt = new NodePortTuple(e.getKey(), pse.getPortNo());// System.out.println("--------------------------------------------");// System.out.println(pse.getRxDropped().getValue() + pse.getTxDropped().getValue());// System.out.println(pse.getRxBytes().getValue() + pse.getTxBytes().getValue()); if((pse.getRxBytes().getValue() + pse.getTxBytes().getValue()) != 0l){ pk_loss = (pse.getRxDropped().getValue() + pse.getTxDropped().getValue())/(pse.getRxBytes().getValue() + pse.getTxBytes().getValue()) ; }else{ pk_loss = 0; }// System.out.println("PK_LOSS:"+pk_loss+",dpid:"+e.getKey().toString()); DPID_PK_LOSS.put(npt, pk_loss); } } } } }}四、链路时延
public interface IMonitorDelayService extends IFloodlightService{ /** * 获取链路之间的时间延迟 * @return Map<MyEntry<NodePortTuple,NodePortTuple>,Integer> 链路：时延 */// public Map<MyEntry<NodePortTuple,NodePortTuple>,Integer> getLinkDelay(); }package aaa.net.floodlightcontroller.test;import java.util.ArrayList;import java.util.Collection;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Map.Entry;import org.projectfloodlight.openflow.protocol.OFMessage;import org.projectfloodlight.openflow.protocol.OFPortDesc;import org.projectfloodlight.openflow.protocol.OFType;import org.projectfloodlight.openflow.types.DatapathId;import net.floodlightcontroller.core.FloodlightContext;import net.floodlightcontroller.core.IFloodlightProviderService;import net.floodlightcontroller.core.IOFMessageListener;import net.floodlightcontroller.core.IOFSwitch;import net.floodlightcontroller.core.IOFSwitchListener;import net.floodlightcontroller.core.PortChangeType;import net.floodlightcontroller.core.internal.IOFSwitchService;import net.floodlightcontroller.core.module.FloodlightModuleContext;import net.floodlightcontroller.core.module.FloodlightModuleException;import net.floodlightcontroller.core.module.IFloodlightModule;import net.floodlightcontroller.core.module.IFloodlightService;import net.floodlightcontroller.linkdiscovery.ILinkDiscoveryService;import net.floodlightcontroller.linkdiscovery.internal.LinkInfo;import net.floodlightcontroller.routing.Link;import net.floodlightcontroller.threadpool.IThreadPoolService;import net.floodlightcontroller.topology.NodePortTuple;public class MonitorDelay implements IFloodlightModule, IOFMessageListener, IMonitorDelayService,IOFSwitchListener { private IThreadPoolService threadPoolServcie; private IOFSwitchService switchService; private ILinkDiscoveryService linkDiscoveryService; private IFloodlightProviderService floodlightProviderService; @Override public String getName() { return "LinkDelay"; } @Override public boolean isCallbackOrderingPrereq(OFType type, String name) { return false; } @Override public boolean isCallbackOrderingPostreq(OFType type, String name) { return false; } @Override public Command receive(IOFSwitch sw, OFMessage msg, FloodlightContext cntx) { return null; } @Override public Collection<Class<? extends IFloodlightService>> getModuleServices() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); l.add(IMonitorDelayService.class); return l; } @Override public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() { Map<Class<? extends IFloodlightService>, IFloodlightService> l = new HashMap<>(); l.put(IMonitorDelayService.class, this); return l; } @Override public Collection<Class<? extends IFloodlightService>> getModuleDependencies() { Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>(); l.add(IFloodlightProviderService.class); l.add(IThreadPoolService.class); l.add(IOFSwitchService.class); l.add(ILinkDiscoveryService.class); return l; } @Override public void init(FloodlightModuleContext context) throws FloodlightModuleException { floodlightProviderService = context.getServiceImpl(IFloodlightProviderService.class); switchService = context.getServiceImpl(IOFSwitchService.class); linkDiscoveryService = context.getServiceImpl(ILinkDiscoveryService.class); threadPoolServcie = context.getServiceImpl(IThreadPoolService.class); } @Override public void startUp(FloodlightModuleContext context) throws FloodlightModuleException { } @Override public void switchAdded(DatapathId switchId) { } @Override public void switchRemoved(DatapathId switchId) { } @Override public void switchActivated(DatapathId switchId) { } @Override public void switchPortChanged(DatapathId switchId, OFPortDesc port, PortChangeType type) { } @Override public void switchChanged(DatapathId switchId) { } public void testFunc(){ Map<Link,LinkInfo> linkInfo = linkDiscoveryService.getLinks(); Iterator<Entry<Link, LinkInfo>> iter = linkInfo.entrySet().iterator(); while(iter.hasNext()){ Entry<Link, LinkInfo> node = iter.next(); System.out.println("源交换机:"+node.getKey().getSrc().toString()+",源端口："+node.getKey().getSrcPort()); System.out.println("目的交换机:"+node.getKey().getDst().toString()+",目的端口："+node.getKey().getDstPort()); System.out.println("链路时延:"+node.getKey().getLatency()); System.out.println("当前时延："+node.getValue().getCurrentLatency()); } }}五、要记得，在配置文件中需要添加上我们添加的service。如果不熟悉的话，可以参考官网的指南，还是挺不错。
链接如下：https://floodlight.atlassian.net/wiki/display/floodlightcontroller/How+to+Write+a+Module
六、改变我们的路由规则
待续~~
也欢迎各位批评指正。！！
美好的2017年已经开始，祝福天下有情人终成眷属，祝愿所有人身体健康，事事如意。
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