4540l3.txt

Listing 3. Applying the NamedValueAccessible Mix-in for Logging

from NamedValueAccessible import NamedValueAccessible

class Transaction(NamedValueAccessible):

   def logColumns(self):
      return 'datetime requestId responseSize duration'.split()

   def logEntry(self):
      ''' Returns a list of values for the transaction
           log, consistent with logColumns(). '''
      return [self.valueForKey(column)
                  for column in self.logColumns()]