The Role of the Software Architect Jeff Lemich CMSC435.
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Transcript of The Role of the Software Architect Jeff Lemich CMSC435.
The Role of the Software Architect
Jeff LemichCMSC435
Intro – Leadership Team – One Option
Managing DirectorSteering Committee
Project Champion Project Manager Project Architect
QADocumentation
Data Administration
SoftwareDevelopment
Managers
FunctionalManagers
SystemsOperations
Product ControlDBA
Not having the support of management.
Starting a project without a champion.
Thinking that the Project Manager role and the Architect role are the same.
Skills Any successful system must be built on a
single vision. You must be able to visualize abstract ideas.
Providing and communicating that vision is the primary function of the architect.
An architect must not only see the forest but the trees and the watershed that makes it possible.
Skills An architect starts with a blank sheet of paper. You must have expertise in data modeling,
software modeling, and related tools. http://www.databaseanswers.com/modelling_tools.htmhttp://www.objectsbydesign.com/tools/umltools_byCompany.html
If you are uncomfortable with the unknown, don’t be a software architect.
You must be creative. Analysis and developers will bring the problems they can’t solve to you.
Skills You must be able to multitask. There will be
many simultaneous projects in different stages of development taking place.
You must be able to answer most questions immediately without referencing documentation.
The project manager will depend on you for design and technical expertise.
You can’t do it all. You must be willing to delegate, be receptive to criticism and ideas, and to promote individual creativity.
Intro
All software has an architecture Unplanned Subsystem level System level Enterprise level
Unplanned Architecture – Shanty Town
Unplanned Architecture
Use free materials Constructed by non-professionals No engineering Has very few rules Can be built very fast No foundation
Subsystem Level Architecture
Subsystem Level Architecture
Uses standard materials Units constructed by building professionals Has some additional rules
Building codes Covenants Directly connected to utilities
Takes some planning Built on footings
System Level Architecture
System Level Architecture Designed by an engineer or architect Integrated utilities Integrated units
Common halls, Lobby, Elevator
Engineering standards Has many additional rules Requires a full foundation
Enterprise Architecture
Enterprise Architecture
Full needs of users / across systems Multiple turf issues Needs advanced architecture and
engineering Integrated utility systems Multiple functions (office / housing) Requires an extensive foundation
Terminology Application – One function (Display Grades) Sub-system – One process (Grading) System – Tightly integrated processes
(Student Records) ERP system – Multiple integrated systems
(Student Information System) Enterprise system – One organization
(Multiple integrated ERP systems)
CP-ONE - Enterprise system
2,000+ Applications/modules (4,500 programs/class) 175+ Menus 85 Sub-systems 1,707 Administrative Users + 35,000 Students + 3,674 Faculty + 55,000 Applications per year 827,000 Active People, 258,000 archived 7,516,627 Active Historic Course Records, 4,581,000 archived 18 Developers + 2 TAs (1 Director, 11 CP-ONE,
3 MF Packages, 5 Web)
Basics An organization may use a number of
architecture styles. Just because an organization is big doesn’t
mean it can’t be built as a shanty town. Unless you form your own company you
will not start as an architect.
Standards SA is mostly developing standards. When a developer is under a tight deadline
the last thing they will think about is standards.
Developers would rather do things the easy way. So make it easier to do things correct.
You must protect the architecture and standards after they are created!!
Standards Surprisingly increase creativity Build standards by consensus where
possible. It produces personal buy-in. As-good-as isn’t Better is better only is if it is worth changing
all other instances of the rule. Every rule is meant to be broken if needed.
It creates a new rule.
PERT/CPM
Will increase productivity and developer satisfaction more than any thing else.
When you start a task you have all the needed resources. Tools like MS Project help. (If used correctly!) Allow for multiple concurrent waterfall development processes.
Software Architecture Steps Rendering Site and resource planning Foundation Utilities Supports Floor Work Penthouse Maintenance Renewal
Rendering
Rendering What is it expected to do. How big will the system be. How is it expected to grow. Who are the users. How dynamic will it be. Is it commercial or private. What environment must it work in. What resources and funding are available?
Rendering
Major systems are now almost exclusively new renditions and integration of existing systems.
This is the step where the overall vision is established.
Don’t take this step lightly. Mistakes here can doom a project.
Site and Resource Planning
Site and Resource Planning How will this system relate to outside systems? What language, database/s and hardware/s will
the system use? Why? What development environments and tools will be
used? Who are the key players and management
structure? Where will the developers come from, be located,
and what experience do they have?
Site and Resource Planning What subsystems are the most important. How do the subsystems relate to each
other. What are the dependencies between
systems. Where is the data now? How much is
there? In what locations? How clean is it? What is the impact of data migration on the old system? Will it change dependencies?
Site and Resource Planning Where is the existing code? Do we have
the source code? Can we weed out the junk? Is it readable and well structured? Can we save any of it?
Do we have available the most important business rules? In code? On paper?
Do we have access to filled in paper forms? Lookout for writing in the margins!
Analysis Paralysis
Foundation
Foundation – For all systems CP-ONE Standard Authentication, State and Session Management Standard Application Look and Feel Standard Screen Headings Standard Function Key and Web Button Usage A Help System with Hyper-Link Capabilities Standard Code Lookup Capability Name search capabilities Standard Date and Term Edits and Processing A Command Line
Field on Applications to Facilitate Movement between Applications A Common Navigation and Menu System Application Access Security Application Function Security Value Security
Foundation A Work Flow System An Aliasing System Flow Control Capabilities to Eliminate Reentering of Key Data
When Switching Applications Standard Error Processing A Standard Way for Applications to Communicate with Each
Other Standard Audit Tables and Processes Standard On-line Batch Control Parameter Models A Standard E-mail Interface for Applications The Ability to Close Sub-systems for Maintenance General and Sub-system Welcome Messaging
Foundation Standardized Printer Definition and User Selection A Generic Text Editor Available to Applications A Generic Way to Add Free Format Notes to Applications Application Models A Mail-Merge Sub-system A Mailing Label Sub-system Batch Dynamic Allocation Capabilities Name Formatting Batch Sorting CP-ONE System Reports
Utilities
Utilities – For related systems Utility Addresses Utility College Master Utility Standard Code Table(s) Utility Degree Honors Utility Department Master Utility Degree Ranking
Utilities Utility Home Page Utility High Schools Utility School Master Utility Term Control Utility Term Dates Utility University Master
Thinking any of the steps up to here
can be skipped.
Supports
Supports Defining structures of the organization. The primary tables that most applications
will use and the objects that support them. How the data in those tables will be loaded
from legacy sources. Will all or parts of the legacy system and
the new system need to run parallel for a period?
Bad Primary Keys,Data Structures,
and Principal Object Relationships
Floor Work
Floor Work Subsystem design and development Smaller versions of the whole process but
with the infrastructure already in place. Use PERT to determine the best order for
subsystem development. Can an assembly line be partially used? By the time you get here you should have
very good metrics to estimate benchmarks.
Floor Work
Don’t forget everything else taught in this
Software Engineering course!!!
Watch out!This is where
specification creep can doom the project.
Penthouse
Penthouse The executive management subsystem Uses summary data from the other
subsystems Assesses the health of the organization Identifies trends Pinpoints potential problems
Maintenance
Maintenance Fix bugs Watch out for table growth Subsystem enhancements New system interfaces Even new subsystems How will new technology be utilized and
integrated? Should it?
Renewal
Renewal / Why? Rendition –Mission and scope change Site and resource planning –
Basic technology or hardware change Foundation – Basic design change Supports – Organizational change Maintenance – Excessive exception coding,
lost support staffing, technology no longer supported
Renewal / When?
SummaryNormalization Do It once
Sequencing Do it in order
Standards Be consistent
Support You can’t do it alone