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TransactionsLogic.py
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TransactionsLogic.py
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import abc
from common_logger import log
class Transaction:
def __init__(self, book_to_transmit, book_destination, book_source=None):
self.book_to_transmit = book_to_transmit
self.book_destination = book_destination
self.book_source = book_source
class QueueExecutorBase(metaclass=abc.ABCMeta):
def __init__(self, queue):
self.queue = queue
# Pattern: Template Method
def run(self):
while not self.queue.empty():
trn = self.queue.get()
self.execute_transaction(trn)
@abc.abstractmethod
def execute_transaction(self, transaction):
""" This sub method will be overridden differently for specific queues """
class OTPQueueExecutor(QueueExecutorBase):
""" otp - from owners to exchange points """
def execute_transaction(self, transaction):
log('Execute transaction %s at otp queue %s' %(transaction, self.queue))
book = transaction.book_to_transmit
transaction.book_destination.put_book(book)
book.owner.give_own_book(book)
def move_books_from_owners_to_points(simulation):
users_own_books = []
# get all own books of users
for user in simulation.all_users:
for book in user.own_books:
users_own_books.append(book)
# prepare list of transactions, to move books from owners, to exchange points
for book in users_own_books:
trn = Transaction(book_to_transmit=book, book_destination=simulation.get_last_exchange_point())
simulation.q_otp.put(trn)
execution = OTPQueueExecutor(queue=simulation.q_otp)
execution.run()