Name: Chih-Hung.Lu UNI: cl3519

1. How to compile 1.a $: make

2. How to run 2.a server: $: java UdpChat -s 2.b client: $: java UdpChat -c

3. Algorithms and datas tructure 3.a Serialize and deserilize I use an efficeint way to serialize the message. The serialization format is that character# of message1 + "." + message1 + character# of message2 + "." + message....

   3.b Registeration table I use hashmap as a registeration table. The key is the nickname and the value of table is the object of client information. Of course, the information of client is encapsulate into an object.

   3.c Protocals The following is the self-defined message type used to communicate between client and server, and also between client and clent. Type0: add register table entry => type, nickName, ip, port, isOnline Type1: ack from server => type, message Type2: ack from client => type Type3: start updat table from server => type Type4: finish updat table from server => type Type5: nack from server => type Type6: nack from client => type, nickName Type7: message from client => type, nickName, message Type8: deregister => type, nickName, ip, port Type9: message to server => type, nickName, message, offlineAccount Type10: message from server => type, nickName, message

4. Test plan I have four shell scripts "server_test.sh", "client_test_namo.sh", "client_test_min.sh" and "client_test_jordan.sh", which can make testing in the same machine more convient. Note that this program can also run in different machen.

   3.a Case#1 1. run server_test.sh in terminal#1 2. run "client_test_namo.sh" in terminal#2 3. run "client_test_min.sh" in terminal#3 4. run "client_test_jordan.sh" in terminal#4 5. In terminal#2, type "send min Hi min" 6. In terminal#2, type "send jordan Hi jordan" 7. In terminal#3, type "send jordan Hi jordan" 8. In terminal#2, type "dereg namo" 9. In terminal#3, type "send namo are you alive" 10. In terminal#4, type "send namo are you alive" 11. In terminal#2, type "reg namo"

   3.b Case#1 result 1. terminal#2: namo@csee4119:~/ChatApp$ sh client_test_namo.sh [Welcome, You are registered.] >>> [Client table updated.] >>> [Client table updated.] >>> [Client table updated.] >>> send min hi min >>> [Message received by min.] >>> send jordan hi jordan >>> [Message received by jordan.] >>> dereg namo >>> [You are Offline. Bye.] >>> reg namo >>> [Welcome, You are registered.] >>> [Client table updated.] >>> [You have messages] >>> min: 2017.03.03-00:43:46 are you alive >>> jordan: 2017.03.03-00:43:52 are you alive >>> ^C[You are Offline. Bye.] >>>

    2. terminal#3:
        namo@csee4119:~/ChatApp$ sh client_test_min.sh 
        [Welcome, You are registered.]
        >>> [Client table updated.]
        >>> [Client table updated.]
        >>> namo: Hi min
        >>> send jordan Hi jordan
        >>> [Message received by jordan.]
        >>> [Client table updated.]
        >>> send namo are you alive
        >>> [No ACK from namo, message sent to server.]
        >>> [Messages received by the server and saved]
        >>> [Client table updated.]
        >>> [Client table updated.]
        >>> ^C[You are Offline. Bye.]
        >>>  
   
    3. terminal#4:
        namo@csee4119:~/ChatApp$ sh client_test_jordan.sh 
        [Welcome, You are registered.]
        >>> [Client table updated.]
        >>> [Client table updated.]
        >>> [Client table updated.]
        >>> namo: Hi jordan
        >>> min: Hi jordan
        >>> [Client table updated.]
        >>> send namo are you alive
        >>> [No ACK from namo, message sent to server.]
        >>> [Messages received by the server and saved]
        >>> [Client table updated.]
        >>> ^C[You are Offline. Bye.]
        >>> 
   

   3.c Case#2 1. run server_test.sh in terminal#1 2. run "client_test_namo.sh" in terminal#2 3. run "client_test_min.sh" in terminal#3 4. In terminal#3, type "dereg jordan" 5. In terminal#1, type "ctl+c" 6. In terminal#2, type "send min Hi min"

   3.d Case#2 result 1. terminal#2: namo@csee4119:~/ChatApp$ sh client_test_namo.sh [Welcome, You are registered.] >>> [Client table updated.] >>> [Client table updated.] >>> send min hi min >>> [No ACK from min, message sent to server.] [Client] server response tiomeout on 1-th time [Client] server response tiomeout on 2-th time [Client] server response tiomeout on 3-th time [Client] server response tiomeout on 4-th time [Client] server response tiomeout on 5-th time >>> [Server not responding] >>> [Exiting] >>>

    2. terminal#3:
        namo@csee4119:~/ChatApp$ sh client_test_min.sh 
        [Welcome, You are registered.]
        >>> [Client table updated.]
        >>> [Client table updated.]
        >>> dereg min
        >>> [You are Offline. Bye.]
        >>>