Software Architecture and Design Presentation

1. Group Members:
Jayaweera W.J.A.I.U. 100227D
Kumarasiri M.K.D.S. 100285C
Liyanage K.L.D.U. 100299X
Sajeewa G.K.M.C. 100470N
Wijewardane M.M.D.T.K.
100612E
Stream Connector

2. What is a Connector?
 A software connector provides one or more of four
general classes of services:
Communication
Coordination
Conversion
Facilitation

3. What is a Stream?
 Streams in a software are used to transfer large
amount of data between autonomous processes.

4. What does the stream
connectors do?
 Stream connection provides
communication services
of the system to support
transmission of data among
components.

5. What other connector types
which can be connected with
stream?
 Data Access Connectors
 To provide composite connectors for performing
database and file storage access
 Event connectors
 To multiplex the delivery of large number of
events

6. Use of Stream
Connectors

7. Examples of Stream
Connector
Unix Pipes
TCP and UDP communication sockets
Proprietary Client-Server protocols

8. Unix Pipes
Keyboard Program
1
Program
3
Program
2
stdin
Display
stderr
stdout/stdin
stdout/stdin
stderr
stderr
stdout

9. TCP/UDP Communication Sockets
Process X Process Y
…. Port N ….
TCP
…. Port N ….
TCP
IP IP

10. Example- Code
public class StartGame {
Socket gameServerSocket;
InputStreamReader inputStreamReader;
BufferedReader bufferedReader;
PrintWriter printWriter;
public void startGame(){
try {
gameServerSocket = new Socket("127.0.0.1", 6000);
System.out.println( gameServerSocket.isConnected());
System.out.println("Connected!!!!!!!!!!!!!");
printWriter=new
PrintWriter(gameServerSocket.getOutputStream());
printWriter.print("JOIN#");

11. Advantages of using Stream
Disadvantages of using Stream

12. Variations of Stream Connector
 So many options are available to a software engineer to
construct a stream connector.
 Stream can be described according to following
dimensions,
• Cardinality of communication
• Format
• Synchronicity
• Locality
• Identity
• State
• Throughput
• Buffering
• Bounds
• Delivery

14. Variations of Streams According to Their
Dimensions
Cardinality – number of parties involve in communication.
Format – format of data which is carried in the stream.
Synchronicity- whether stream provides synchronicity or not
Locality – scope of communication
Identity – whether the stream-base connector is named or unnamed

15. Variations (ctd…)
State - whether stream maintains communication state or not
Throughput – number of data units transferred in unit time
Bounds - whether the stream-base connector is bounded or
unbounded
Buffering - whether it contains a buffer or not for flow control
Delivery - effort it takes to transfer data

16. Q & A