存根类(stub) 是什么意思？有什么作用？

   

   它的作用是：如果一个接口有很多方法，如果要实现这个接口，就要实现所有的方法。但是一个类从业务来说，可能只需要其中一两个方法。如果直接去实现这个接口，除了实现所需的方法，还要实现其他所有的无关方法。而如果通过继承存根类就实现接口，就免去了这种麻烦

 

这个在omco2.6版本中用户登录的session中的接口就有体现。

 

 

 

 

package com.utstar.omco.jnti.inc;  
  
  
public inte易做图ce ITBusStub extends IEngineHandle  
{  
    ITAclInte易做图ce getAclInte易做图ce();  
    void setName(String name);  
    String getUUID();  
    int generateSID();  
    int getSessionCount();  
    ITServerSession getSession(int sid);  
    ITServerSession[] getAllSession();  
    int delSession(int sid, ITableRegChange ic);  
    int _onRecvResult(Msg.MsgInfo msg);  
    Msg.MsgInfo _onNeedExec();  
    int _onRecvFromSession(ITServerSession s, Msg.MsgInfo msg);  
    int _onRegister(Msg.ReguestRegister reg, ITableRegChange ic);  
    void _onUpdateRegInfo(String src, ITableRegChange ic);  
    int _onAddSession(ITServerSession s);  
}  

 

 

 

上面的类ITBusStub，就是一个stub类，它的作用主要是用于继承一个接口类，然后它的实现类只需要通过实现它这个接口就可以，

实现需要调用的方法。BusStub是它的实现类。

 

 

public class BusStub extends AbsEngineHandle implements ITBusStub,IMonitor  
{  
    public static inte易做图ce MsgPriorityStrategy  
    {  
        public int onRecvResultPriority(Msg.MsgInfo msg);  
        public int onRecvFromSessionPriority(ITServerSession s, Msg.MsgInfo msg);  
    }  
      
    public static class ResultPriorMsgPriorityStrategy implements MsgPriorityStrategy  
    {  
        public int onRecvResultPriority(Msg.MsgInfo msg)  
        {  
            return DefaultEngine.PRIO_HIGH;  
        }  
  
        public int onRecvFromSessionPriority(ITServerSession s, Msg.MsgInfo msg)  
        {  
            return DefaultEngine.PRIO_DEFAULT;  
        }  
    }  
      
    AtomicInteger m_curSessionIdx = new AtomicInteger(1);  
  
    IMsgQueue<Msg.MsgInfo> m_cmdQue = new MsgQueue<Msg.MsgInfo>("cmd");  
    IMsgQueue<Msg.MsgInfo> m_resultQue = new MsgQueue<Msg.MsgInfo>("result");  
  
    ConcurrentHashMap<Integer, ITServerSession> m_svc = new ConcurrentHashMap<Integer, ITServerSession>();  
  
    NotifyReg m_reg = new NotifyReg();  
  
    ITDispatch m_dispatch;  
  
    ITAclInte易做图ce m_acl = ITAclInte易做图ce.s_defaultAcl;  
    String m_uuid = UUID.randomUUID().toString();  
    String m_name;  
      
    MsgPriorityStrategy m_msgPriorityStrategy;  
      
    LongStatPrp sp_cmdnum = new LongStatPrp("recv cmd",0);  
    LongStatPrp sp_resultnum = new LongStatPrp("send result",0);  
    LongStatPrp sp_notifynum = new LongStatPrp("send notify",0);  
      
    private static final Log logger = LogFactory.getLog("comm");  
      
    public BusStub(String name)  
    {  
        this(name, null);  
    }  
  
    public BusStub(String name, MsgPriorityStrategy msgPriorityStrategy)  
    {  
        m_name = name;  
        m_msgPriorityStrategy = msgPriorityStrategy;  
    }  
      
      
    public String getName()  
    {  
        return m_name;  
    }  
    public void setName(String name)  
    {  
        m_name = name;  
    }  
  
    public String getUUID()  
    {  
        return m_uuid;  
    }  

 

补充：软件开发 , Java ,