68 lines
1.8 KiB
ReStructuredText
68 lines
1.8 KiB
ReStructuredText
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App Handler
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===========
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There is one special "global" type of :term:`handler` which
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corresponds to the :term:`app` itself, whereas all other handlers
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correspond to some "portion" of the app.
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The :term:`app handler` provides:
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* various "global" utilities
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* primary interface for obtaining all other handlers
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The base class and default app handler is
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:class:`wuttjamaican.app.AppHandler`.
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The :term:`config object` is responsible for creating the app handler
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via :meth:`~wuttjamaican.conf.WuttaConfig.get_app()`::
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from wuttjamaican.conf import make_config
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config = make_config()
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app = config.get_app()
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Overriding the App Handler
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--------------------------
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It is expected that many apps will want a more customized app handler.
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To do this, first create your app handler class e.g. in
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``poser/app.py``::
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from wuttjamaican.app import AppHandler
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class PoserAppHandler(AppHandler):
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"""
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Custom app handler for the Poser system.
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"""
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def make_session(self, **kwargs):
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"""
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Override this method to specify extra/default params etc.
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"""
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#kwargs.setdefault('foo', 'bar')
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session = super().make_session(**kwargs)
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return session
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def hello(self):
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"""
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Extra method to print a hello message.
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"""
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print("hello from", self.appname)
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Then in your config file, specify that your app handler should be used
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instead of the default. Note that the config section will need to
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match whatever the :term:`app name` is. (And note that the app name
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is not necessarily the same as your :term:`package` name!)
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.. code-block:: ini
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# nb. this is the default
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[wutta]
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app.handler = poser.app:PoserAppHandler
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# but if appname is 'foobar' then it should be this
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[foobar]
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app.handler = poser.app:PoserAppHandler
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