Team A

3PB ProjectMidterm Progress Report

Original System Design

Current System Design

Server

Listener

Parser

Data Manager

3PB Computer

User

Interface

Display

User Interface

Server

Listener

Parser

Data Manager

3PB Computer

User

Interface

Display

User Interface Instantiate other classes (eg DataManager,

Listener) Get user authentication -- Listener Get stock symbol and time resolution from

user Send the symbol to Listener to register -->

Real Data Service

User Interface Send time resolution to Data Manager --

DataManager Display textual data -- Display Display activity (should be done for the first

iteration, but not yet) Display raw TOS data (should be done for the

first iteration, and it is!)

Data Manager

Server

Listener

Parser

Data Manager

3PB Computer

User

Interface

Display

Data Flow

Data Manager

3PB Computer

ParserUser Interface

DisplayTOS sampled every

time resolution

time resolution

3PB output (event)

TOS sampled every time resolution

new TOS

Data Manager Samples incoming TOS in 1-sec

interval (using sample-and-hold) Stores samples When sample for the next Time

Resolution is available, passes it to 3PB Computer

Pros: Independent of local system time Doesn’t need to be in separate thread

Data Manager

RecordTOS( newTOS ) called by Parser samples TOS, and store new samples when sample available for next Time

Resolution(s), passes it to 3PBComputer

Data Manager ChangeTimeResolution( newResolu

tn ) called by UserInterface changes Time Resolution starts from first sample and passes

sample at every new Time Resolution to 3PBComputer

3PB Computer Computes trends and break prices

using 3PB method from TOS data. Passes outputs to a Display.

3PB Computer FirstTOS( tos )

called by DataManager initializes starting price

NextTos( tos ) called by DataManager uses 3PB method to compute trend

and price break if has output, generates event for

Display

Server/Listener

Server

Listener

Parser

Data Manager

3PB Computer

User

Interface

Display

Server Sends TOS data every 2 seconds Threaded

One thread sends data One thread listens to the client

Allows stock symbol and price to change

Listener Threaded in a similar fashion. Functions:

Opening and closing a server connection

Stores username/password Sends stock/price changes to server

Sends server data to a Parser

Parser Packages server data into a TOS

object Implementing the Adapter Design

Pattern via Java Interfaces Sends data to DataManager

Overview of Demo Dummy data server starts UserInterface gets user ID, password,

stock symbol and initial time resolution Data server sends TOS every 2 seconds Listener gets raw stream and displays it ThreePBComputer computes and

displays results

What We’ll Do Next Allow user to change stock symbol Display trend information Indicate Fibonnaci points Connect to Real Data Service Indicator to show program running Codify Coding Conventions Organize CVS repository

Pros of XP Discovering design problems

earlier Easier debugging Larger skill set Problems can be solved in parallel No marathons – You are forced to

walk away from the code

Cons of XP Inter-pair Communication No detailed overall design Scheduling Can’t always work when the mood

strikes