在floodlight源码的基础上添加一个新的module并正确运行

1.在src/main/java目录下新建一个package，目录结构如下：

2.在新建的package下，新建一个class，名字就是自定义的module，接下来implements想实现的service或listener，但是一定要implements自IFloodlightModule。这个类如下所示：

 package net.floodlightcontroller.mactracker;

 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Map;
 import java.util.Set;
 import java.util.concurrent.ConcurrentSkipListSet;

 import org.projectfloodlight.openflow.protocol.OFMessage;
 import org.projectfloodlight.openflow.protocol.OFType;
 import org.projectfloodlight.openflow.util.HexString;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;

 import net.floodlightcontroller.core.FloodlightContext;
 import net.floodlightcontroller.core.IFloodlightProviderService;
 import net.floodlightcontroller.core.IOFMessageListener;
 import net.floodlightcontroller.core.IOFSwitch;
 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.packet.Ethernet;

 public class MACTracker implements IOFMessageListener, IFloodlightModule{

     protected IFloodlightProviderService floodlightProvider;
     protected Set macAddresses;
     protected static Logger logger;

     /**
      * 添加本module的id
      */
     @Override
     public String getName() {
         return "MACTracker";
     }
     @Override
     public boolean isCallbackOrderingPrereq(OFType type, String name) {
         // TODO Auto-generated method stub
         return false;
     }
     @Override
     public boolean isCallbackOrderingPostreq(OFType type, String name) {
         // TODO Auto-generated method stub
         return false;
     }
     @Override
     public Collection<Class<? extends IFloodlightService>> getModuleServices() {
         // TODO Auto-generated method stub
         return null;
     }
     @Override
     public Map<Class<? extends IFloodlightService>, IFloodlightService> getServiceImpls() {
         // TODO Auto-generated method stub
         return null;
     }

     /**
      * 把依赖关系告诉模块加载系统
      */
     @Override
     public Collection<Class<? extends IFloodlightService>> getModuleDependencies() {
         Collection<Class<? extends IFloodlightService>> l = new ArrayList<Class<? extends IFloodlightService>>();
         l.add(IFloodlightProviderService.class);
         return l;
     }
     /**
      * 实现init初始化，这个方法会在controller启动时调用，以加载依赖和数据结构
      */
     @Override
     public void init(FloodlightModuleContext context) throws FloodlightModuleException {
         floodlightProvider = context.getServiceImpl(IFloodlightProviderService.class);
         macAddresses = new ConcurrentSkipListSet<Long>();
         logger = LoggerFactory.getLogger(MACTracker.class);
     }
     /**
      * 实现startUp方法，为packet_in消息绑定事件处理委托，在这之前我们必须保证所有依赖的模块已经初始化
      * 主要是用来添加监听器
      */
     @Override
     public void startUp(FloodlightModuleContext context) throws FloodlightModuleException {
         floodlightProvider.addOFMessageListener(OFType.PACKET_IN, this);
     }
     /**
      * 处理packet_in消息，返回Command.CONTINUE以便其它事件处理程序继续处理
      * 这里是用来搜集源MAC地址
      */
     @Override
     public Command receive(IOFSwitch sw, OFMessage msg, FloodlightContext cntx) {
         Ethernet eth = IFloodlightProviderService.bcStore.get(cntx, IFloodlightProviderService.CONTEXT_PI_PAYLOAD);
         Long sourceMACHash = Ethernet.toLong(eth.getSourceMACAddress().getBytes());
         if(!macAddresses.contains(sourceMACHash)) {
             macAddresses.add(sourceMACHash);
             logger.info("开始所搜集MAC地址："
                     + "MAC Address: {} seen on switch:{}", HexString.toHexString(sourceMACHash), sw.getId());
         }
         return Command.CONTINUE;
     }

 }

这个module由receive方法驱动，具体功能是搜集MAC地址，结果如下所示：