[chef] Writing a provider

[Alexandre Russel < >]

Hi all, 

 I've read several time the doc an LWRP, but I'm still a bit lost on how to do it. If someone is kind enough to answer a few questions:

- are an instance of a provider created for each resource it processes ?

- http://docs.opscode.com/lwrp_custom_provider.html :

  * "The load_current_resource method is used to find a resource" => does this mean I have to write this method ? is it called by chef ? 

 * "The current_resource method is used to represent a resource " => might be nice to see it in the code snippet, is it the same as @current_resource ?

- where is the normal place to persist downloaded file ?

- is there a way to share state between all resource processing during a chef run:

  foobar "a"

  foobar  "b"

if foobar is supposed doing a long computation can he save it somewhere the first time foobar "a" is processed to be able to reuse it when foobar "b" is processed ?

thanks for your time,

Alex