Skip to main content

Python client for the G Adventures REST API

Project description

# django-dispatcher

Logic engine for determining order of things to execute

Sometimes there's a series of things that must run in sequence. This is a
configuration based approach enabling that.

Typical Usage

1. Create some transition objects. They are basically Interfaces that
require some methods and properties to be defined and reward you with
some context built at an appropriate time.

The required functions/params include:
- final_state (String)
- is_valid (Function returning Boolean)
- context (Function returning Dict)


from dispatcher import Transition

class Cart2DayReminder(Transition):

final_state = CART_2_DAY_REMINDER_SENT

def onlinebooking(self):
if self._onlinebooking is None:
self._onlinebooking = OnlineBooking.objects.get(pk=self.resources['online_booking'])
return self._onlinebooking
_onlinebooking = None

def profile(self):
if self._profile is None:
self._profile = self.onlinebooking.user and self.onlinebooking.user.profile
return self._profile
_profile = None

def is_valid(self):

if self.onlinebooking.date_updated < ( - timedelta(days=2)):
self.errors.append('The booking was created less than 2 days ago')
return False

return True

def build_context(self):
return {

class Cart1WeekReminder(Transition):


2. Create a config, listing the transitions that can happen

'chains': [
'chain_type': 'abandoned_cart',
'transitions': {
NEW: [Cart2DayReminder, Cart1WeekReminder],
Cart2DayReminder.final_state: [Cart1WeekReminder, ],
Cart1WeekReminder.final_state: [],


3. Initialize the dispatcher with the above settings. You'll have to
determine the `chain_type` on your own. Its name must be the same as
the above config. We include the `requests_by` to keep track of where
the request originates from.


from dispatcher import Dispatcher

dispatcher = Dispatcher(


4. Provide the resources to query searching for a chain. The chain
will query using an `AND` statement, meaning all the resources must
be present when retrieving the chain.


('online_booking', '123456'),
('customer', '57844')


5. Provide a callback for the chain. Should a chain transition to a new
valid state, whatever callback you pass will be sent on. The callback
takes the transition passed in and any callback arguments specified.


def some_callback(transition, \**callback_args):
# so something magical

dispatcher.execute_chain(callback=some_callback, callback_args={})


Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for django-dispatcher, version 0.1.1
Filename, size File type Python version Upload date Hashes
Filename, size django-dispatcher-0.1.1.tar.gz (5.1 kB) File type Source Python version None Upload date Hashes View

Supported by

AWS AWS Cloud computing Datadog Datadog Monitoring DigiCert DigiCert EV certificate Facebook / Instagram Facebook / Instagram PSF Sponsor Fastly Fastly CDN Google Google Object Storage and Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Salesforce Salesforce PSF Sponsor Sentry Sentry Error logging StatusPage StatusPage Status page