Event notification

Setting up the publisher to notify the subscriber involves two steps:

1. Associating the listener with the topic
2. Sending a message to the subscriber

The first step is achieved in the views.py module of the Django maintenance app. In the accept() method, the following is added immediately after variable initialization:

    from biglittle.events.publisher import Publisher
    publisher = Publisher()
    config    = Config()
    userSvc   = UserService(config, 'User', publisher)
    loanSvc   = LoanService(config, 'Loan', publisher)
    publisher.attach(publisher.EVENT_LOAN_UPDATE_BORROWER, \
                     userSvc.updateBorrowerListener)

In the biglittle.domain.base.Base class, we modify the __init__() method to accept the publisher as an argument:

class Base :
    def __init__(self, config, result_class = None, publisher = None) :
        self.publisher = publisher
        # other logic in this method now shown

In the processPayment() method...