banks.py :  » Database » Python-Remote-Objects » Pyro-3.10 » examples » Bank2 » Python Open Source

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Python Open Source » Database » Python Remote Objects 
Python Remote Objects » Pyro 3.10 » examples » Bank2 » banks.py
# Bank and accounts code.
# NOTE that the Account and Bank classes are directly derived
# from the Pyro.core.ObjBase base class. This is required to
# support the 1.2+ attribute access feature.
# Note that an account object is not returned as-is, 
# rather, a PROXY for it is returned.
# Also note that the proxy must support attribute access, so
# we use getAttrProxy().

import Pyro.core

# the bank uses this exception to say there's something wrong:
class BankError(Exception): pass

# Unrestricted account.
class Account(Pyro.core.ObjBase):
  def __init__(self,name,owner):
    Pyro.core.ObjBase.__init__(self)
    self.balance=0.0
    self.name=name
    self.bank=owner
  def _gotReaped(self):
    print 'Account reaped, sorry your cash is lost:',self.name,self.balance 
    self.bank._gotReaped(self)
  def withdraw(self, amount):
    self.balance-=amount
  def deposit(self,amount):
    self.balance+=amount

# Restricted withdrawal account.
class RestrictedAccount(Account):
  def withdraw(s, amount):
    if amount<=s.balance:
      s.balance=s.balance-amount
    else:
      raise BankError('insufficent balance')

# Abstract bank.
class Bank(Pyro.core.ObjBase):
  def __init__(s):
    Pyro.core.ObjBase.__init__(s)
    s.accounts={}
  def createAccount(s, name):
    pass # must override this!
  def _gotReaped(self, account):
    del self.accounts[account.name]
    print 'Bank removed reaped account',account.name
  def deleteAccount(s, name):
    try:
      # find account, disconnect from daemon, delete it
      acc = s.accounts[name]
      s.getDaemon().disconnect(acc)
      del s.accounts[name]
    except KeyError:
      raise BankError('unknown account')
  def findAccount(s, name):
    try:
      # find account, return proxy for it
      return s.accounts[name].getAttrProxy()
    except KeyError:
      raise BankError('unknown account')

  def allAccounts(s):
    # list all accounts, return list of proxies for them
    accs = s.accounts.values()
    proxies = []
    for a in accs:
      proxies.append(a.getAttrProxy())
    return proxies


# Special bank: Rabobank. It has unrestricted accounts.
class Rabobank(Bank):
  def __init__(s):
    Bank.__init__(s)
    s.name = 'Rabobank'
  def createAccount(s,name):
    if s.accounts.has_key(name):
      raise BankError('Account already exists')
    # create account object, connect to daemon, return proxy for it
    acc = Account(name,s)
    acc_URI = s.getDaemon().connect(acc)
    s.accounts[name]=acc
    print 'created account',name
    return acc.getAttrProxy()


# Special bank: VSB. It has restricted accounts.
class VSB(Bank):
  def __init__(s):
    Bank.__init__(s)
    s.name = 'VSB bank'
  def createAccount(s,name):
    if s.accounts.has_key(name):
      raise BankError('Account already exists')
    # create account object, connect to daemon, return proxy for it
    acc = RestrictedAccount(name,s)
    acc_URI = s.getDaemon().connect(acc)
    s.accounts[name]=acc
    print 'created account',name
    return acc.getAttrProxy()

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