Clojure Exchange 2014 - resource management in clojure

gistfile1.txt

Clojure lazy + side-effects is a little odd

Resources
- file handlers
- db stuff

This is where the problem exists in clojure as these parts aren't fun.

Short lived handles;

doall? memory, dies, heap on the floor
- lose beneficial laziness
- only works for small stuff

Generator function
- provide infinite list over resource
- close when we get to the end
- awful idea

Don't lie to the consumer
- Create file handler and give it to the user
- Let them deal with it
- Create an interface

Iterators;
- often have a close function
- have sequence
- also doesn't work!
- same as short lived, give the handle back to the user
- don't hide stuff

Long lived resources and concurrency
- db handles etc
- don't want to open for each request (obv)

Solution! (lies)
- lock db. heh

Solution! (lies)
- agents
- nope nope nope
- agents and atoms doing god knows what

Core.async
- channel from resource
- loop over incoming commands
- solves all his problems
- big loop of taking commands and doing things
- OH SHIT, have just reinvented actors

So maybe just do it like erlang
- except without supervisors, processors etc

Use Erlang!