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#!/usr/bin/env python
# $Id$
from Error import GeneratorError
from syslog import syslog, LOG_ERR
class Generator(object):
'''This is a class that generators can be subclassed from.
__name__, __version__, and __author__ must be set for the module
__provides__ is a dictionary mapping listing the entity type and name to a function name
__requires__ is a set of external published data needed for operation'''
__name__ = None
__version__ = None
__provides__ = {}
__requires__ = []
def __init__(self, core, datastore):
self.core = core
self.data = "%s/%s"%(datastore,self.__name__)
self.__setup__()
def __setup__(self):
'''This method must be overloaded during subclassing.
All module specific setup, including all publication, occurs here.'''
def CompleteSetup(self):
self.ReadAll()
print "%s loaded"%(self.__version__)
def Cron(self):
'''Cron defines periodic tasks to maintain data coherence'''
pass
def Publish(self,key,value):
self.core.Publish(self.__name__,key,value)
def Read(self,key):
self.core.ReadValue(key)
def ReadAll(self):
self.external = {}
for field in self.__requires__:
self.external[field] = self.Read(field)
def GetMetadata(self,client,field):
'''GetMetadata returns current metadata file client. Field can be one of:
image, tags, bundles'''
pass
def Notify(self,region):
'''Generate change notification for region'''
pass
def GetProbes(self, metadata):
return []
def AcceptProbeData(self, client, probedata):
return
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