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#ifndef RDT_SENDER_H
#define RDT_SENDER_H
#include "DataStructure.h"
//定义RdtSender抽象类,规定了必须实现的三个接口方法
//具体的子类比如StopWaitRdtSender、GBNRdtSender必须给出这三个方法的具体实现
//只考虑单向传输,即发送方只发送数据和接受确认
struct RdtSender
{
virtual bool send(const Message &message) = 0; //发送应用层下来的Message,由NetworkService调用,如果发送方成功地将Message发送到网络层,返回true;如果因为发送方处于等待确认状态或发送窗口已满而拒绝发送Message,则返回false
virtual void receive(const Packet &ackPkt) = 0; //接受确认Ack,将被NetworkService调用
virtual void timeoutHandler(int seqNum) = 0; //Timeout handler,将被NetworkService调用
virtual bool getWaitingState() = 0; //返回RdtSender是否处于等待状态,如果发送方正等待确认或者发送窗口已满,返回true
virtual ~RdtSender() = 0;
};
#endif
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