Sliding Window Protocol Program In Java With Algorithm

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I am fairly new to java (and programming overall) and have received the task to implement a Sliding Window object from start to finish. The skeleton code is as follows: import java.util.Scanner; //.

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Sliding window protocols are data link layer protocols for reliable and sequential delivery of data frames. The sliding window is also used in Transmission Control Protocol. In these protocols, the sender has a buffer called the sending window and the receiver has buffer called the receiving window.

In one – bit sliding window protocol, the size of the window is 1. So the sender transmits a frame, waits for its acknowledgment, then transmits the next frame. Thus it uses the concept of stop and waits for the protocol. This protocol provides for full – duplex communications. Hence, the acknowledgment is attached along with the next data frame to be sent by piggybacking.

Working Principle

The data frames to be transmitted additionally have an acknowledgment field, ack field that is of a few bits length. The ack field contains the sequence number of the last frame received without error. If this sequence number matches with the sequence number of the frame to be sent, then it is inferred that there is no error and the frame is transmitted. Otherwise, it is inferred that there is an error in the frame and the previous frame is retransmitted.

Since this is a bi-directional protocol, the same algorithm applies to both the communicating parties.

The algorithm of One – bit Sliding Window Protocol

Illustrative Example

The following diagram depicts a scenario with sequence numbers 0, 1, 2, 3, 0, 1, 2 and so on. It depicts the sliding windows in the sending and the receiving stations during frame transmission.

import java.io.*;

public class slidsender

public static void main(String a[])throws Exception

ServerSocket ser=new ServerSocket(10);

DataInputStream in=new DataInputStream(System.in);

DataInputStream in1=new DataInputStream(s.getInputStream());

PrintStream p;

String ch;

{

System.out.print('Enter the no. of frames : ');

p.println(nf);

{

System.out.println('Enter '+nf+' Messages to be sendn');

{

p.println(sbuff[sptr]);

}

System.out.print('Acknowledgment received');

System.out.println(' for '+ano+'frames');

}

{

System.out.println('The no. of frames exceeds windowsize');

}

System.out.print('nDo you wants to send some moreframes : ');

}

s.close();

}

//RECEIVER PROGRAM

import java.net.*;

class slidreceiver

public static void main(String a[])throws Exception

Socket s=new Socket(InetAddress.getLocalHost(),10);

DataInputStreamin=new DataInputStream(s.getInputStream());

PrintStream p=new PrintStream(s.getOutputStream());

String rbuf[]=new String[8];

nf=Integer.parseInt(in.readLine());

{

rbuf[rptr]=in.readLine();

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System.out.println('The received Frame '+rptr+' is : '+rbuf[rptr]);

rws-=nf;

p.println(rptr+1); rws+=nf; }

break;

}