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：