[Repoze-dev] obob example...

[Chris McDonough]

I was typing this to Mike, but I think this is useful enough to send  
to the list.

What we're aiming for is a world where a hello world app that uses  
obob might look something like this:

def helloworld():
     return 'hello world!'

root = {'helloworld':helloworld}

def get_root(request):
     return root

Configuration will register get_root as the callable for obob to get  
the root:

[application:helloworld]
use = egg:repoze.obob#publisher
root_factory = helloworld:get_root

Then from a web browser, if you visit http://localhost:8080/ 
helloworld, you would see:

hello world!

obob will call str() against an object returned or may call some  
other method on an object returned to it if it "implements some  
interface" (yet to be decided).  obob will guess at a content type if  
you don't set one (in this case, 'text/plain').  If you do want to  
set one, you will be able to get a "response" object (perhaps as a  
thread local via repoze.obob.get_response()) and set a content type  
or other headers using the response object API from anywhere in the  
code.  And so forth.

By default, obob will traverse the graph using '__getitem__' against  
each object during path traversal and it will use __call__ against  
the returned object.  You will be able to register alternate  
traversers and callers that do different things based on whatever  
policy you decide.

- C

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