Dynamic Build Languages
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Facilitated by Josh Price and Tom Adams
Build Tools
What's the current state of Java build tools?
Performance is not always optimal.
ant
- programming in xml doesn't make sense
- big ball of ant problem
- the 9000 line "untouchable" collection of build script
- few conventions
- lots of rope to hang yourself
- hard to refactor
- ill-conceived
- even JDD has disowned it
maven
- good conventions but hard to diverge from the norm
- simple things are simple
- moderate things are really hard (write a plugin)
- hard things are virtually impossible
- too much voodoo
- not enough docs
- hard to find where/how to configure things
- kind of buggy
- (I think this was attributed to plugins)
- declarative model is too strict
- flexibility is needed here
- appeals to the less experienced
- can get yourself in trouble if you assume it all just works
What can Java learn from Ruby?
rake
- testing your build?
- once it gets really big you need to be able to reason about your build.
- tests could allow you to refactor/optimise/etc without breaking anything
- testing is much simpler with a real language
- if you're stuck with ant you could use antunit (http://ant.apache.org/antlibs/antunit/)
- we really need a first class language for flexibility
- programming in xml doesn't make sense
- pure declarative model solves some problems but reduces flexibility
- auto include of rake files allows easy factoring
- possible to separate the definition of dependencies - who depends on me?
- builtin namespaces (ie db:*, test:*)
- plugins in ruby are really simple
- monkey patching
- file dependency checking is built in
- what changed? do it anyway not optimal speed
- auto checking of timestamps
raven
- java builds using rake and gems
- Book just released
Deployment tools
Capistrano for Java deployment?
- posix only (no windows yet)
- installing cygwin is a solution
- write adapters for the commands used (ssh, ftp, etc)
- version 2.0 just released
- peepcode demo (http://topfunky.com/clients/peepcode/free-episodes/peepcode-free-deprec.mov)
- building ubuntu box remotely via ssh
- using the deprec gem (http://www.deprec.org/)
- convincing management that using a Ruby tool on a Java project is a good thing
- it's often easier to just do it and show the benefits
- ask for forgiveness rather than permission
Links
- http://www.capify.org/upgrade/whats-new
- The Event framework look particularly interesting
- http://www.iseff.com/2007/03/capistrano-and-java.html
- http://www.oreillynet.com/ruby/blog/2007/04/capistrano_20_not_just_for_rai.html
- http://www.smartfrog.org - SmartFrog is a technology for describing distributed software systems as collections of cooperating components, and then activating and managing them. It was developed at HP Labs in Bristol, in the UK. The core SmartFrog framework is released under LGPL.
