1 from sfa.util.sfalogging import logger
2 from sfa.util.config import Config
4 from sfa.managers.managerwrapper import ManagerWrapper
6 # a bundle is the combination of
7 # (*) an api that reacts on the incoming requests to trigger the API methods
8 # (*) a manager that implements the function of the service,
9 # either aggregate, registry, or slicemgr
10 # (*) a driver that controls the underlying testbed
13 # The Generic class is a utility that uses the configuration to figure out
14 # which combination of these pieces need to be put together
16 # this extra indirection is needed to adapt to the current naming scheme
17 # where we have 'pl' and 'plc' and components and the like, that does not
18 # yet follow a sensible scheme
20 # needs refinements to cache more efficiently, esp. wrt the config
24 def __init__ (self, flavour, config):
29 # example flavour='pl' -> sfa.generic.pl.pl()
31 def the_flavour (flavour=None, config=None):
32 if config is None: config=Config()
33 if flavour is None: flavour=config.SFA_GENERIC_FLAVOUR
34 flavour = flavour.lower()
35 #mixed = flavour.capitalize()
36 module_path="sfa.generic.%s"%flavour
37 classname="%s"%flavour
38 logger.info("Generic.the_flavour with flavour=%s"%flavour)
40 module = __import__ (module_path, globals(), locals(), [classname])
41 return getattr(module, classname)(flavour,config)
43 logger.log_exc("Cannot locate generic instance with flavour=%s"%flavour)
45 # in the simplest case these can be redefined to the class/module objects to be used
46 # see pl.py for an example
47 # some descendant of SfaApi
48 def api_class (self) : pass
49 # the python classes to use to build up the context
50 def registry_class (self) : pass
51 def slicemgr_class (self) : pass
52 def aggregate_class (self) : pass
53 def component_class (self) : pass
57 # insert a manager instance
58 def make_api (self, *args, **kwargs):
59 # interface is a required arg
60 if not 'interface' in kwargs:
61 logger.critical("Generic.make_api: no interface found")
62 api = self.api_class()(*args, **kwargs)
63 manager = self.make_manager(api.interface)
64 driver = self.make_driver (api.config, api.interface)
65 ### arrange stuff together
66 # add a manager wrapper
67 manager_wrap = ManagerWrapper(manager,api.interface)
68 api.manager=manager_wrap
69 # insert driver in manager
70 logger.info("Setting manager.driver, manager=%s"%manager)
72 # add it in api as well for convenience
76 def make_manager (self, interface):
78 interface expected in ['registry', 'aggregate', 'slice', 'component']
79 flavour is e.g. 'pl' or 'max' or whatever
81 flavour = self.flavour
82 message="Generic.make_manager for interface=%s and flavour=%s"%(interface,flavour)
84 classname = "%s_manager_class"%interface
86 module = getattr(self,classname)()
87 logger.debug("%s : %s"%(message,module))
90 logger.log_exc_critical(message)
92 # need interface to select the right driver
93 def make_driver (self, config, interface):
94 flavour = self.flavour
95 message="Generic.make_driver for flavour=%s and interface=%s"%(flavour,interface)
97 if interface == "component":
98 classname = "component_driver_class"
100 classname = "driver_class"
102 class_obj = getattr(self,classname)()
103 logger.debug("%s : %s"%(message,class_obj))
104 return class_obj(config)
106 logger.log_exc_critical(message)