The Go-Back-N version of this lab in Java

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The Go-Back-N version of this lab
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You are to write the procedures, A_output(),A_input(),A_timerinterrupt(),A_init(),B_input (), and B_init() which together will implement a Go-Back-N unidirectional transfer of data from the A-side to the B-side, with a window size of 8 Your protocol should use both ACK and NACK messages Consult the alternating-bit-protocol version of this lab above for information about how to obtain the network emulator
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Lab: Implementting a reliable transport protocol
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We would STRONGLY recommend that you first implement the easier lab (Alternating Bit) and then extend your code to implement the harder lab (Go-Back-N) Believe me - it will not be time wasted! However, some new considerations for your Go-Back-N code (which do not apply to the Alternating Bit protocol) are:
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A_output(message), where message is a structure of type msg, containing data to be sent to the B-side Your A_output() routine will now sometimes be called when there are outstanding, unacknowledged messages in the medium - implying that you will have to buffer multiple messages in your sender Also, you'll also need buffering in your sender because of the nature of Go-Back-N: sometimes your sender will be called but it won't be able to send the new message because the new message falls outside of the window Rather than have you worry about buffering an arbitrary number of messages, it will be OK for you to have some finite, maximum number of buffers available at your sender (say for 50 messages) and have your sender simply abort (give up and exit) should all 50 buffers be in use at one point (Note: using the values given below, this should never happen!) In the ``real-world,'' of course, one would have to come up with a more elegant solution to the finite buffer problem! A_timerinterrupt() This routine will be called when A's timer expires (thus generating a timer interrupt) Remember that you've only got one timer, and may have many outstanding, unacknowledged packets in the medium, so you'll have to think a bit about how to use this single timer
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Consult the Alternating-bit-protocol version of this lab above for a general description of what you might want to hand in You might want to hand in output for a run that was long enough so that at least 20 messages were successfully transfered from sender to receiver (ie, the sender receives ACK for these messages) transfers, a loss probability of 02, and a corruption probability of 02, and a trace level of 2, and a mean time between arrivals of 10 You might want to annotate parts of your printout with a colored pen showing how your protocol correctly recovered from packet loss and corruption For extra credit, you can implement bidirectional transfer of messages In this case, entities A and B operate as both a sender and receiver You may also piggyback acknowledgments on data packets (or you can choose not to do so) To get my emulator to deliver messages from layer 5 to your B_output() routine, you will need to change the declared value of BIDIRECTIONAL from 0 to 1
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Helpful Hints and the like
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Checksumming You can use whatever approach for checksumming you want Remember that the sequence number and ack field can also be corrupted We would suggest a TCP-like checksum, which consists of the sum of the (integer) sequence and ack field values, added to a character-by-character sum of the payload field of the packet (ie, treat each character as if it were an 8 bit integer and just add them together) Note that any shared ``state'' among your routines needs to be in the form of global variables Note also that any information that your procedures need to save from one invocation to the next must also be a global (or static) variable For example, your routines will need to keep a copy of a packet for possible retransmission It would probably be a good idea for such a data structure to be a global variable in your code Note, however, that if one of your global variables is used by your sender side, that variable should NOT be accessed by the receiving side entity, since in real life, communicating entities connected only by a communication channel can not share global variables There is a float global variable called time that you can access from within your code to help you out with your diagnostics msgs
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