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Legacy / long running projects - Ruby on Rails

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Page 3. def. Long running: > 2 ... technology: rewrite. Good (famous) examples: â Mac OS -> OS X. â Minix ->

Legacy / long running projects RubyConfLT 2012

def "A legacy system is an old method, technology, computer system, or application program that continues to be used, typically because it still functions for the users' needs, even though newer technology or more efficient methods of performing a task are now available." (Wikipedia)

def

Long running: > 2 years

def

Reality: long running =~ legacy

important!

technology + team

important?

technology + team

t n e m e g a n a m

technology: upgrade

worth total rewrite? =~ to be or not to be

technology: rewrite

technology: rewrite

unless...

technology: rewrite ● ● ● ● ●

50% rule clear legacy system requirements new technology mature enough & team ready benefits/costs ratio customer understands what's going on (...)

technology: rewrite Good (famous) examples: ● Mac OS -> OS X ● Minix -> Linux ● PHP 1 -> PHP 2

technology: rewrite Good (famous) examples: ● Mac OS -> OS X ● Minix -> Linux ● PHP 1 -> PHP 2 ● UBB -> vBulletin ● Netscape -> Mozilla ● ...

technology: rewrite ● ● ● ● ● ● ●

integration tests prioritize! be ready to support legacy system simplify migrate data early rewrite piece-by-piece usually takes longer than expected

technology: technical debt "Like a financial debt, the technical debt incurs interest payments, which come in the form of the extra effort that we have to do in future development because of the quick and [1] dirty design choice."

[1] http://martinfowler.com/bliki/TechnicalDebt.html

technology: technical debt

Main diff from short period projects: technical debt matters

technology: technical debt

Main diff from short period projects: technical debt matters A LOT

technology: technical debt

Impact on team & development speed

hard part: team

As always with HR: difficult to measure

team: motivation ● lack of "hot" tech stuff ● high level of sh*t (everything needs to be fixed!..) ● lack of challenge in well known field ● routine, routine, routine

team: motivation

side projects IS-A-MUST

team: motivation

side projects IS-A-MUST even if forced

team: motivation

hackathons startup weekends conferences

team: motivation

scoped(freedom) to choose tech

team: technical debt

pay your debt in time.

team: motivation

collective code ownership at least weak code ownership

team: motivation

adequate attention to non-tech problem solving (universal)

team: motivation if a product has some fans (hopefully), forward/communicate love letters to the team

return 1. technology matters as much as it matters to the TEAM 2. changes are and must be inevitable 3. way of recharging the batteries must be developed to get rid of long run exhaustion 4. ... 5. profit!

end +Vidmantas Kabošis @vidmantas [email protected] vidmantas.kabosis.lt slides: bit.ly/legacy-long-running-projects

Questions?