application lifecycles: 2 case studies - lorelore.ua.ac.be/teaching/capitamaster/application...
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Background info... (1)
Joris Van LooverenVolvo IT - Gent (Oostakker)[email protected]
Background
Computer science @ VUB (some time ago...)
Now: (web) application development at Volvo IT
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Background info... (2)Volvo IT
IT services branch of Volvo Group(Volvo Group = most everything motorised... except cars)
Service areas:
Hardware:- everything network-related- computing environment (= computers & intranet)
Software:- licenses for commercial software- custom application development
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ContentsApplication lifecycle?
Case studies @ Volvo IT
2 applications:Infoshop: simpleANDON: complex
Observations
Questions
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Application Lifecycle (1):Wikipedia definition
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Application Lifecycle (1):Wikipedia definition
JIRA
JUnitJABD
CVSSubversion
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Application Lifecycle (2)
Many different aspects
Static concepts - focused on “how” - tools to use to perform tasks
However:- not “forward-looking” doesn’t address possible changes- how do we prepare?
Ergo: can we find out what changes are likely to happen?
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Application Lifecycle:Case studies
2 case studiesapplications built by Volvo IT
1. ANDONproduction quality follow-up application
2.InfoshopPortal for providing all kinds of reporting to end-users
2 extremes of the complexity spectrum
how did they change of their lifetimes?
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Application Lifecycle
Initial Development
Deploy to production
Changes
Retirement
- user initiated- infrastructure change - ...
- business driver
- change in business process- replacement- ...
Maintenance- bug fixes- “keep it running”
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Application Lifecycle
Initial Development
Deploy to production
Changes
Retirement
- user initiated- infrastructure change - ...
- business driver
- change in business process- replacement- ...
Maintenance- bug fixes- “keep it running”
What happenshere?
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Case study 1: Infoshop
2 extremes of the complexity spectrum
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Oracledatabase
Report Bursting Engine
Infoshop
Infoshop:original structure
Networkshare
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Infoshop:constraints
Java expertise available in-house
Oracle used for Business Intelligence systems
Reports too large and numerous for DB→ external storage required
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Infoshop:choices
Monolithic J2EE application
External file share for document storage- protection against data loss- no storage on application server
Spring (dependency injection)
Data access through iBatis(= named query manager)
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Infoshop:current structure
Oracledatabase
Report Bursting Engine
Infoshop
Networkshare
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Infoshop:changes
Nothing really changed?!
Server migrations:WebSphere 5 → WebSphere 6 → WebSphere 7
reason: end-of-life by IBM
no real issues; just drop app onto server!
Several smaller changes
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Case study 2: ANDON
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DB2database
uploadbreakdown
ANDONweegbrug
digitaltacho
toolsoft
weegbrug
digitaltacho
toolsoft
VDAHDOC
= VCOM
= file share
= HTTP
weegbrugprinter
ANDON:original structure
PDA
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ANDON:structure
Loosely coupled set of modules
technology: individual J2EE projects
server: IBM WebSphere on zLinux= linux in VM on z/OS (mainframe)
“interaction” mostly through DB
most modules process external inputaggregation in DB
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ANDON:constraints
Java expertise available in-house
DB2 used company-wide in external systems
interface with 3rd party systems(weigh bridge, ToolSoft, digital tacho)- driver software by vendor- what can vendor provide?- quality of 3rd party software “variable”
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ANDON:choices
Loosely coupled set of modules- independent development- independent redeploy possible in many cases
Lots of file sharing (!!)- protection against data loss (file remains if server dies while processing)- access arbitration by OS- network transfer by OS
Proprietary data access mechanism- EJBs deemed too complex (pre EJB3)
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DB2database
uploadbreakdown
ANDONweegbrug
digitaltacho
toolsoft
weegbrug
digitaltacho
toolsoft
VDAHDOC
= VCOM
= file share
= HTTP
weegbrugprinter
ANDON:current structure
= Web service
PDA
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ANDON:changes
Server migrations:WebSphere 5 → WebSphere 6 → WebSphere 7
reason: end-of-life by IBM
problems: WAS5→WAS6: file sharing semantics changed → introduction of web servicesWAS6→WAS7: webservice technology changed
User complaint:complete rewrite of Weighbridge module
Lots of small changes to individual moduels
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Observations (1):technological evolution at Volvo ITTechnological evolution for NEW java web apps:
Spring + Hibernate
“Template application”empty application (in-house) that contains the most common components
Styles in CSS
Ajax components
Custom build + deploy cycle
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Observations (2)
Parallel evolutions:
New technologies introduced in new apps
Per application:- conform to infrastructure changes (in casu: server changes)- change according to user requirements- regular maintenance
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Observations (3a):application specific
External systems WILL outlast your application- 3rd party systems: * vendor out of business * vendor cannot perform changes * vendor charges too much for changes * ...- databases * data store harder to change
Infrastructure changes more important to support- product end-of-life
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Observations (3b):application specific
Technological (Java) innovations:
most likely introduced in new applications(new frameworks, new Java version)
most likely not retrofitted in old applicationsunless:- as part of significant changes- when no expertise left
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Observations (4):general considerations
Budgets!- there’s never enough for all “necessary” changes- driver of all changes
Maintenance- “keep it running”- often no time/budget for structural maintenance (e.g. framework upgrade → not visible)- very hard to keep architectural uniformity across applications
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Any questions?
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