The document appears to be a set of lecture or study notes related to the topic of Application Architecture and Design Patterns. It is divided into several chapters, each covering different aspects of the subject. The notes include information on design patterns, the impact of external factors like...
Application Architecture and Design Patterns 3/10/23
Chapter 1
Introduction
1.
Design patterns are a starting point
-You don’t have to use every design pattern
-Choose those best suited for the job
GDPR
-The UK is no longer in the EU
-Economic/political impacts: Costing £360 million in tariffs
Data centres
-Example of environmental impact = heat (can be harnessed)
-Technical = technical expertise (internal and external IT teams)
-Social = influencers marketing products on social media
-Poor design of architectural systems can cause issues when trying to
evolve that system
-Context diagram
-Interconnections (five systems brought together as one system)
-There are interactions between systems
2.
Architectural patterns/software patterns
Iterative
-Patches on windows (loopholes that can be exploited, changes that can
be made)
Indirect = what the client wants the system to do (trade-offs are always
involved)
3.
Patterns
-Things done before can be used again
-Don’t shoehorn something in just because you’re comfortable with it (the
biggest problem is people taking a pattern they know and shoehorning it
in)
-If a pattern you know doesn’t fit can you make changes to it?
-Not definitive
Computer Based Systems
1.
One or more interfaces to different systems or people
-Theoretically laying out hardware
Renting or buying
-Renting from Amazon is an advantage
-Data security is important
2.
Distribution
, -Benefits = if there’s a cyber-attack, half of the system goes down because
it’s shared across multiple devices
-Data centres in amazon can switch networks quickly
-Disadvantages include a delay between machines
Scope
-A small system replaced by a big system which didn’t understand what to
do
-Don’t overstretch in your coursework
3.
Reliability
-Does it do what it’s supposed to do?
-Is it constantly running?
Performance
-Saving = encryption at source, which impacts performance
Revisit changes
-Talk about performance security and reliability in coursework (theory
practice)
-Pigeon-holing things is human behaviour
4.
Event (self-driving car)
-Telling you when to change gears
-Appendix 1 (see what these systems are) = transaction processing
system and sales management system
-Over time things change, so you have to go back and implement new
systems
-A finished project is never done (the Student Information System at GCU)
5.
Batch Processing
-Transactions are completed during working hours and bank deals with
them overnight (shops)
6.
EBPS
-Prewash on washing machine = stop, start, final spin (three events)
7.
Software Architecture
-Deployment diagram
-Firewall = security
-Interface (sends information to banking system)
8.
Software Product Development
-Differentiating = Android prioritise volume whereas Apple don’t
The Architectural Design Process
,1.
Processes
-Specify (don’t move on until the client has signed off on the system)
-Parallel running = both systems running at the same time till you’re
happy with them
2.
Requirements Engineering process
Never start again as that means wasting money
Patterns
-Model View Controller = architectural pattern (dropped into detail design)
4.
Viewpoints
-Considering the perspective of others (example = staff designing modules
for students at Glasgow Caledonian Uni)
Changes
-Constant updates on Windows
-Reflects updates in system documentation process (see if the code
matches the explanation)
5.
Architectural design documentation in relation to implementation structure
-Changes might not run well on existing technology
-Creating a new system can be easier than updating an already existing
system
6.
Legislation
-Office
Submitting proposal
-Financial estimation
-Rent or buy RAM (expensive decision)
-What does the system do?
-Not hugely spread out but it does affect kit
-using Amazon (renting RAM is helpful)
-Are AWS data centres clean?
-Bank maintenance is usually done between 3am-5am on Sunday
-GDPR (a constant issue) = based in EU so it must comply with EU GDPR
7.
Design overarching system structure
-Read ahead then make changes
8.
Architectural Degradation
-If kit is made obsolete you won’t be able to get maximum performance
out of it anymore
, The Software Architect
1.
Small to medium companies combine architects and developers into one
job
Communication skills
-Remember that what’s obvious to you might not be obvious to the client
2.
Smaller companies
-Can pose significant risk due to insufficient independent review
-In your coursework groups reflect on each other’s decisions, get different
viewpoints, discuss with each other and with other groups
3.
The Architect
-Has cutting edge knowledge
-Good management and leadership skills
4.
Company
-Small vs large affects your role and knowledge
5/6.
Architect duties
-Turn up as often as you can, be inquisitive and do what’s asked of you
7/8.
Standards
-Bluetooth, Wi-Fi, XML
-De Jure = standards
-De Facto = Windows
Summary
System Architecture
-Look at Appendix 1
Applications Architecture and Design- 17/10/23
Software Design
Introduction
· Coursework: people want to do too much too soon
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