class Manager (RemoteObject):
"""
This is the main class of Chimera.
Use this class to get Proxies, add objects to the system, and so on.
This class handles objects life-cycle as described in ILifecycle.
@group Add/Remove: add*, remove
@group Start/Stop: start, stop
@group Proxy: getProxy
@group Shutdown: wait, shutdown
"""
def __init__(self, host = None, port = None):
RemoteObject.__init__ (self)
log.info("Starting manager.")
self.resources = ResourcesManager()
self.classLoader = ClassLoader()
# identity
self.setGUID(MANAGER_LOCATION)
# shutdown event
self.died = threading.Event()
# our daemon server
self.adapter = ManagerAdapter (self, host, port)
self.adapterThread = threading.Thread(target=self.adapter.requestLoop)
self.adapterThread.setDaemon(True)
self.adapterThread.start()
# register ourselves
self.resources.add(MANAGER_LOCATION, self, getManagerURI(self.getHostname(), self.getPort()))
# private
def __repr__ (self):
if hasattr(self, 'adapter') and self.adapter:
return "<Manager for %s:%d at %s>" % (self.adapter.hostname, self.adapter.port, hex(id(self)))
else:
return "<Manager at %s>" % hex(id(self))
# adapter host/port
def getHostname (self):
if self.adapter:
return self.adapter.hostname
else:
return None
def getPort (self):
if self.adapter:
return self.adapter.port
else:
return None
# reflection (console)
def getResources (self):
"""
Returns a list with the Location of all the available resources
"""
return self.resources.keys()
def getResourcesByClass(self, cls):
ret = self.resources.getByClass(cls)
return [ x.location for x in ret ]
# helpers
def getDaemon (self):
return self.adapter
def getProxy (self, location, name='0', host=None, port=None, lazy=False):
"""
Get a proxy for the object pointed by location. The given location can contain index
instead of names, e.g. '/Object/0' to get objects when you don't know their names.
location can also be a class. getProxy will return an instance
named 'name' at the given host/port (or on the current
manager, if None given).
host and port parameters determines which Manager we will
lookup for location/instance. If None, look at this
Manager. host/port is only used when location is a
class, otherwise, host and port are determined by location
itself.
lazy parameter determines if Manager will try to locate the
selected Manager at host/port and ask them for a valid
object/instance. If False, Manager just return an proxy for
the selected parameters but can't guarantee that the returned
Proxy have an active object bounded.
For objects managed by this own Manager, lazy is always False.
@param location: Object location or class.
@type location: Location or class
@param name: Instance name.
@type name: str
@param host: Manager's hostname.
@type host: str
@param port: Manager's port.
@type port: int
@param lazy: Manager's laziness (check for already bound objects on host/port Manager)
@type lazy: bool
@raises NotValidChimeraObjectException: When a object which doesn't inherites from ChimeraObject is given in location.
@raises ObjectNotFoundException: When te request object or the Manager was not found.
@raises InvalidLocationException: When the requested location s invalid.
@return: Proxy for selected object.
@rtype: Proxy
"""
if not location:
raise ObjectNotFoundException ("Couldn't find an object at the"
" given location %s" % location)
if not isinstance(location, StringType) and not isinstance(location, Location):
if issubclass(location, ChimeraObject):
location = Location(cls=location.__name__, name=name, host=host or self.getHostname(), port=port or self.getPort())
else:
raise NotValidChimeraObjectException ("Can't get a proxy from non ChimeraObject's descendent object (%s)." % location)
else:
location = Location(location, host=host or self.getHostname(), port=port or self.getPort())
# who manages this location?
if self._belongsToMe(location):
ret = self.resources.get(location)
if not ret:
raise ObjectNotFoundException ("Couldn't found an object at the"
" given location %s" % location)
p = Proxy (uri=ret.uri)
if lazy:
return p
else:
p.ping()
return p
else:
if lazy:
return Proxy(location)
else:
# contact other manager
try:
other = Proxy(location=MANAGER_LOCATION,
host=location.host or host,
port=location.port or port)
except Pyro.errors.URIError, e:
raise InvalidLocationException("Invalid remote location given. '%s' (%s)." % (location, str(e)))
if not other.ping():
raise ObjectNotFoundException ("Can't contact %s manager at %s." % (location, other.URI.address))
proxy = other.getProxy(location)
if not proxy:
raise ObjectNotFoundException ("Couldn't find an object at the"
" given location %s" % location)
else:
return proxy
class Manager(RemoteObject):
"""
This is the main class of Chimera.
Use this class to get Proxies, add objects to the system, and so on.
This class handles objects life-cycle as described in ILifecycle.
@group Add/Remove: add*, remove
@group Start/Stop: start, stop
@group Proxy: getProxy
@group Shutdown: wait, shutdown
"""
def __init__(self, host=None, port=None):
RemoteObject.__init__(self)
log.info("Starting manager.")
self.resources = ResourcesManager()
self.classLoader = ClassLoader()
# identity
self.setGUID(MANAGER_LOCATION)
# shutdown event
self.died = threading.Event()
# our daemon server
self.adapter = ManagerAdapter(self, host, port)
self.adapterThread = threading.Thread(target=self.adapter.requestLoop)
self.adapterThread.setDaemon(True)
self.adapterThread.start()
# register ourself
self.resources.add(MANAGER_LOCATION, self,
getManagerURI(self.getHostname(), self.getPort()))
# private
def __repr__(self):
if hasattr(self, 'adapter') and self.adapter:
return "<Manager for %s:%d at %s>" % (
self.adapter.hostname, self.adapter.port, hex(id(self)))
else:
return "<Manager at %s>" % hex(id(self))
# adapter host/port
def getHostname(self):
if self.adapter:
return self.adapter.hostname
else:
return None
def getPort(self):
if self.adapter:
return self.adapter.port
else:
return None
# reflection (console)
def getResources(self):
"""
Returns a list with the Location of all the available resources
"""
return self.resources.keys()
def getResourcesByClass(self, cls):
ret = self.resources.getByClass(cls)
return [x.location for x in ret]
# helpers
def getDaemon(self):
return self.adapter
def getProxy(self, location, name='0', host=None, port=None, lazy=False):
"""
Get a proxy for the object pointed by location. The given location can contain index
instead of names, e.g. '/Object/0' to get objects when you don't know their names.
location can also be a class. getProxy will return an instance
named 'name' at the given host/port (or on the current
manager, if None given).
host and port parameters determines which Manager we will
lookup for location/instance. If None, look at this
Manager. host/port is only used when location is a
class, otherwise, host and port are determined by location
itself.
lazy parameter determines if Manager will try to locate the
selected Manager at host/port and ask them for a valid
object/instance. If False, Manager just return an proxy for
the selected parameters but can't guarantee that the returned
Proxy have an active object bounded.
For objects managed by this own Manager, lazy is always False.
@param location: Object location or class.
@type location: Location or class
@param name: Instance name.
@type name: str
@param host: Manager's hostname.
@type host: str
@param port: Manager's port.
@type port: int
@param lazy: Manager's laziness (check for already bound objects on host/port Manager)
@type lazy: bool
@raises NotValidChimeraObjectException: When a object which doesn't inherites from ChimeraObject is given in location.
@raises ObjectNotFoundException: When te request object or the Manager was not found.
@raises InvalidLocationException: When the requested location s invalid.
@return: Proxy for selected object.
@rtype: Proxy
"""
if not location:
raise ObjectNotFoundException("Couldn't find an object at the"
" given location %s" % location)
if not isinstance(location, StringType) and not isinstance(
location, Location):
if issubclass(location, ChimeraObject):
location = Location(cls=location.__name__,
name=name,
host=host or self.getHostname(),
port=port or self.getPort())
else:
raise NotValidChimeraObjectException(
"Can't get a proxy from non ChimeraObject's descendent object (%s)."
% location)
else:
location = Location(location,
host=host or self.getHostname(),
port=port or self.getPort())
# who manages this location?
if self._belongsToMe(location):
ret = self.resources.get(location)
if not ret:
raise ObjectNotFoundException("Couldn't found an object at the"
" given location %s" % location)
p = Proxy(uri=ret.uri)
if lazy:
return p
else:
p.ping()
return p
else:
if lazy:
return Proxy(location)
else:
# contact other manager
try:
other = Proxy(location=MANAGER_LOCATION,
host=location.host or host,
port=location.port or port)
except Pyro.errors.URIError, e:
raise InvalidLocationException(
"Invalid remote location given. '%s' (%s)." %
(location, str(e)))
if not other.ping():
raise ObjectNotFoundException(
"Can't contact %s manager at %s." %
(location, other.URI.address))
proxy = other.getProxy(location)
if not proxy:
raise ObjectNotFoundException(
"Couldn't find an object at the"
" given location %s" % location)
else:
return proxy
class TestResources:
def __init__ (self):
# each test will receive a fresh new class, so define our fixture right here
self.res = ResourcesManager ()
def test_add (self):
assert len (self.res) == 0
assert self.res.add ("/Location/l1", "instance-1", "uri-1") == 0
# location already added
assert_raises(InvalidLocationException, self.res.add, "/Location/l1", "instance-1", "uri-1")
assert self.res.add ("/Location/l2", "instance-2", "uri-2") == 1
assert_raises(InvalidLocationException, self.res.add, "wrong location", "instance-2", "uri-2")
assert "/Location/l1" in self.res
assert "/Location/l2" in self.res
assert "/Location/0" in self.res
assert not "/LocationNotExistent/l2" in self.res
assert len (self.res) == 2
def test_str (self):
assert len (self.res) == 0
assert self.res.add ("/Location/l1", "instance-1", "uri-1") == 0
assert type(str(self.res.get('/Location/0'))) == StringType
def test_remove (self):
assert len (self.res) == 0
assert self.res.add ("/Location/l1", "instance-1", "uri-1") == 0
assert self.res.remove ("/Location/l1") == True
assert_raises(ObjectNotFoundException, self.res.remove, "/What/l1")
assert_raises(InvalidLocationException, self.res.remove, "wrong location")
assert "/Location/l1" not in self.res
def test_get (self):
assert len (self.res) == 0
assert self.res.add ("/Location/l2", "instance-2", "uri-2") == 0
assert self.res.add ("/Location/l1", "instance-1", "uri-1") == 1
ret = self.res.get ("/Location/l1")
assert ret.location == "/Location/l1"
assert ret.instance == "instance-1"
assert ret.uri == "uri-1"
assert_raises(ObjectNotFoundException, self.res.get, "/Location/l99")
# get using subscription
assert self.res["/Location/l1"].location == "/Location/l1"
assert_raises(KeyError, self.res.__getitem__, "/LocationNotExistent/l1")
assert_raises(KeyError, self.res.__getitem__, "wrong location")
# get by index
assert self.res.get("/Location/0").location == "/Location/l2"
assert self.res.get("/Location/1").location == "/Location/l1"
assert_raises(ObjectNotFoundException, self.res.get, '/Location/9')
assert_raises(ObjectNotFoundException, self.res.get, '/LocationNotExistent/0')
assert_raises(InvalidLocationException, self.res.get, 'wrong location')
def test_get_by_class (self):
assert len (self.res) == 0
assert self.res.add ("/Location/l1", "instance-1", "uri-1") == 0
assert self.res.add ("/Location/l2", "instance-2", "uri-2") == 1
entries = [self.res.get ("/Location/l1"), self.res.get ("/Location/l2")]
# get by class
found = self.res.getByClass ("Location")
assert (entries == found)
def test_get_by_class_and_bases (self):
assert len (self.res) == 0
class Base(object): pass
class A(Base): pass
class B(A): pass
assert self.res.add ("/A/a", A(), "a-uri") == 0
assert self.res.add ("/B/b", B(), "b-uri") == 0
assert self.res.add ("/A/aa", A(), "a-uri") == 1
assert self.res.add ("/B/bb", B(), "b-uri") == 1
entries = [self.res.get ("/A/a"), self.res.get ("/B/b"), self.res.get ("/A/aa"), self.res.get ("/B/bb")]
# get by class
found = self.res.getByClass ("Base", checkBases=True)
assert (entries == found)
class TestResources:
def __init__(self):
# each test will receive a fresh new class, so define our fixture right here
self.res = ResourcesManager()
def test_add(self):
assert len(self.res) == 0
assert self.res.add("/Location/l1", "instance-1", "uri-1") == 0
# location already added
assert_raises(InvalidLocationException, self.res.add, "/Location/l1",
"instance-1", "uri-1")
assert self.res.add("/Location/l2", "instance-2", "uri-2") == 1
assert_raises(InvalidLocationException, self.res.add, "wrong location",
"instance-2", "uri-2")
assert "/Location/l1" in self.res
assert "/Location/l2" in self.res
assert "/Location/0" in self.res
assert not "/LocationNotExistent/l2" in self.res
assert len(self.res) == 2
def test_str(self):
assert len(self.res) == 0
assert self.res.add("/Location/l1", "instance-1", "uri-1") == 0
assert type(str(self.res.get('/Location/0'))) is str
def test_remove(self):
assert len(self.res) == 0
assert self.res.add("/Location/l1", "instance-1", "uri-1") == 0
assert self.res.remove("/Location/l1") == True
assert_raises(ObjectNotFoundException, self.res.remove, "/What/l1")
assert_raises(InvalidLocationException, self.res.remove,
"wrong location")
assert "/Location/l1" not in self.res
def test_get(self):
assert len(self.res) == 0
assert self.res.add("/Location/l2", "instance-2", "uri-2") == 0
assert self.res.add("/Location/l1", "instance-1", "uri-1") == 1
ret = self.res.get("/Location/l1")
assert ret.location == "/Location/l1"
assert ret.instance == "instance-1"
assert ret.uri == "uri-1"
assert_raises(ObjectNotFoundException, self.res.get, "/Location/l99")
# get using subscription
assert self.res["/Location/l1"].location == "/Location/l1"
assert_raises(KeyError, self.res.__getitem__,
"/LocationNotExistent/l1")
assert_raises(KeyError, self.res.__getitem__, "wrong location")
# get by index
assert self.res.get("/Location/0").location == "/Location/l2"
assert self.res.get("/Location/1").location == "/Location/l1"
assert_raises(ObjectNotFoundException, self.res.get, '/Location/9')
assert_raises(ObjectNotFoundException, self.res.get,
'/LocationNotExistent/0')
assert_raises(InvalidLocationException, self.res.get, 'wrong location')
def test_get_by_class(self):
assert len(self.res) == 0
assert self.res.add("/Location/l1", "instance-1", "uri-1") == 0
assert self.res.add("/Location/l2", "instance-2", "uri-2") == 1
entries = [self.res.get("/Location/l1"), self.res.get("/Location/l2")]
# get by class
found = self.res.getByClass("Location")
assert (entries == found)
def test_get_by_class_and_bases(self):
assert len(self.res) == 0
class Base(object):
pass
class A(Base):
pass
class B(A):
pass
assert self.res.add("/A/a", A(), "a-uri") == 0
assert self.res.add("/B/b", B(), "b-uri") == 0
assert self.res.add("/A/aa", A(), "a-uri") == 1
assert self.res.add("/B/bb", B(), "b-uri") == 1
entries = [
self.res.get("/A/a"),
self.res.get("/B/b"),
self.res.get("/A/aa"),
self.res.get("/B/bb")
]
# get by class
found = self.res.getByClass("Base", checkBases=True)
assert (entries == found)
class Manager(RemoteObject):
"""
This is the main class of Chimera.
Use this class to get Proxies, add objects to the system, and so on.
This class handles objects life-cycle as described in ILifecycle.
@group Add/Remove: add*, remove
@group Start/Stop: start, stop
@group Proxy: getProxy
@group Shutdown: wait, shutdown
"""
def __init__(self, host=None, port=None):
RemoteObject.__init__(self)
log.info("Starting manager.")
self.resources = ResourcesManager()
self.classLoader = ClassLoader()
# identity
#self.setGUID(MANAGER_LOCATION)
# shutdown event
self.died = threading.Event()
# our daemon server
self.adapter = ManagerAdapter(self, host, port)
self.adapterThread = threading.Thread(target=self.adapter.requestLoop)
self.adapterThread.setDaemon(True)
self.adapterThread.start()
# register ourselves
self.resources.add(MANAGER_LOCATION, self,
getManagerURI(self.getHostname(), self.getPort()))
# private
def __repr__(self):
if hasattr(self, 'adapter') and self.adapter:
return "<Manager for %s:%d at %s>" % (
self.adapter.hostname, self.adapter.port, hex(id(self)))
else:
return "<Manager at %s>" % hex(id(self))
# adapter host/port
def getHostname(self):
if self.adapter:
return str(None) #self.adapter.hostname
else:
return None
def getPort(self):
if self.adapter:
#return self.adapter.port
return None
else:
return None
# reflection (console)
def getResources(self):
"""
Returns a list with the Location of all the available resources
"""
return list(self.resources.keys())
def getResourcesByClass(self, cls):
ret = self.resources.getByClass(cls)
return [x.location for x in ret]
# helpers
def getDaemon(self):
return self.adapter
def getProxy(self, location, name='0', host=None, port=None, lazy=False):
"""
Get a proxy for the object pointed by location. The given location
can contain index instead of names, e.g. '/Object/0' to get objects
when you don't know their names.
location can also be a class. getProxy will return an instance
named 'name' at the given host/port (or on the current
manager, if None given).
host and port parameters determines which Manager we will
lookup for location/instance. If None, look at this
Manager. host/port is only used when location is a
class, otherwise, host and port are determined by location
itself.
lazy parameter determines if Manager will try to locate the
selected Manager at host/port and ask them for a valid
object/instance. If False, Manager just return an proxy for
the selected parameters but can't guarantee that the returned
Proxy have an active object bounded.
For objects managed by this own Manager, lazy is always False.
@param location: Object location or class.
@type location: Location or class
@param name: Instance name.
@type name: str
@param host: Manager's hostname.
@type host: str
@param port: Manager's port.
@type port: int
@param lazy: Manager's laziness (check for already bound
objects on host/port Manager)
@type lazy: bool
@raises NotValidChimeraObjectException: When a object which doesn't
inherit from ChimeraObject
is given in location.
@raises ObjectNotFoundException: When te request object or the Manager
was not found.
@raises InvalidLocationException: When the requested location is invalid.
@return: Proxy for selected object.
@rtype: Proxy
"""
if not location:
raise ObjectNotFoundException("Couldn't find an object at the"
" given location %s" % location)
if not isinstance(location, StringType) and not isinstance(
location, Location):
if issubclass(location, ChimeraObject):
location = Location(cls=location.__name__,
name=name,
host=host or self.getHostname(),
port=port or self.getPort())
else:
raise NotValidChimeraObjectException(
"Can't get a proxy from non ChimeraObject's descendent object (%s)."
% location)
else:
location = Location(location,
host=host or self.getHostname(),
port=port or self.getPort())
# who manages this location?
if self._belongsToMe(location):
ret = self.resources.get(location)
if not ret:
raise ObjectNotFoundException("Couldn't found an object at the"
" given location %s" % location)
p = Proxy(uri=ret.uri)
if lazy:
return p
else:
p.ping()
return p
else:
if lazy:
return Proxy(location)
else:
# contact other manager
try:
other = Proxy(location=MANAGER_LOCATION,
host=location.host or host,
port=location.port or port)
except Pyro4.errors.URIError as e:
raise InvalidLocationException(
"Invalid remote location given. '%s' (%s)." %
(location, str(e)))
if not other.ping():
raise ObjectNotFoundException(
"Can't contact %s manager at %s." %
(location, other.URI.address))
proxy = other.getProxy(location)
if not proxy:
raise ObjectNotFoundException(
"Couldn't find an object at the"
" given location %s" % location)
else:
return proxy
def _belongsToMe(self, location):
meHost = self.getHostname()
meName = socket.gethostbyname(meHost)
mePort = self.getPort()
# if Manager's binded on (0.0.0.0), just check the port, host doesn't
# matter.
if meHost == "0.0.0.0":
return (location.port is None or location.port == self.getPort())
else:
return (location.host is None or location.host in (meHost, meName)) and \
(location.port is None or location.port == mePort)
# shutdown management
def shutdown(self):
"""
Ask the system to shutdown. Closing all sockets and stopping
all threads.
@return: Nothing
@rtype: None
"""
# die, but only if we are alive ;)
if not self.died.isSet():
log.info("Shuting down manager.")
# stop objects
# damm 2.4, on 2.5 try/except/finally works
try:
try:
elderly_first = sorted(
list(self.resources.values()),
cmp=lambda x, y: cmp(x.created, y.created),
reverse=True)
for resource in elderly_first:
# except Manager
if resource.location == MANAGER_LOCATION:
continue
# stop object
self.stop(resource.location)
except ChimeraException:
pass
finally:
# kill our adapter
self.adapter.shutdown(disconnect=True)
# die!
self.died.set()
log.info("Manager finished.")
def wait(self):
"""
Ask the system to wait until anyone calls L{shutdown}.
If nobody calls L{shutdown}, you can stop the system using
Ctrl+C.
@return: Nothing
@rtype: None
"""
try:
try:
while not self.died.isSet():
time.sleep(1)
except IOError:
# On Windows, Ctrl+C on a sleep call raise IOError 'cause
# of the interrupted syscall
pass
except KeyboardInterrupt:
# On Windows, Ctrl+C on a sleep call raise IOError 'cause
# of the interrupted syscall
self.shutdown()
# objects lifecycle
def addLocation(self, location, path=[], start=True):
"""
Add the class pointed by 'location' to the system configuring it
using 'config'. Manager will look for the class in 'path' and sys.path.
@param path: The class search path.
@type path: list
@param start: start the object after initialization.
@type start: bool
@raises ChimeraObjectException: Internal error on managed (user) object.
@raises ClassLoaderException: Class not found.
@raises NotValidChimeraObjectException: When an object which doesn't
inherit from ChimeraObject is
given in location.
@raises InvalidLocationException: When the requested location s invalid.
@return: retuns a proxy for the object if sucessuful, False otherwise.
@rtype: Proxy or bool
"""
if type(location) != Location:
location = Location(location)
if not self._belongsToMe(location):
# remote object, just add it to resource list.
# use a dummy instance to make things easier to Resources Manager
# getByClass feature.
cls = self.classLoader.loadClass(location.cls, path)
self.resources.add(location, cls(), None)
return True
# get the class
cls = None
cls = self.classLoader.loadClass(location.cls, path)
return self.addClass(cls, location.name, location.config, start)
def addClass(self, cls, name, config={}, start=True):
"""
Add the class 'cls' to the system configuring it using 'config'.
@param cls: The class to add to the system.
@type cls: ChimeraObject
@param name: The name of the new class instance.
@type name: str
@param config: The configuration dictionary for the object.
@type config: dict
@param start: start the object after initialization.
@type start: bool
@raises ChimeraObjectException: Internal error on managed (user) object.
@raises NotValidChimeraObjectException: When a object which doesn't inherites from ChimeraObject is given in location.
@raises InvalidLocationException: When the requested location s invalid.
@return: retuns a proxy for the object if sucessuful, False otherwise.
@rtype: Proxy or bool
"""
location = Location(cls=cls.__name__, name=name, config=config)
# names must not start with a digit
if location.name[0] in "0123456789":
raise InvalidLocationException(
"Invalid instance name: %s (must start with a letter)" %
location)
if location in self.resources:
raise InvalidLocationException(
"Location %s is already in the system. Only one allowed (Tip: change the name!)."
% location)
# check if it's a valid ChimeraObject
if not issubclass(cls, ChimeraObject):
raise NotValidChimeraObjectException(
"Cannot add the class %s. It doesn't descend from ChimeraObject."
% cls.__name__)
# run object __init__ and configure using location configuration
# it runs on the same thread, so be a good boy
# and don't block manager's thread
try:
obj = cls()
except Exception:
log.exception("Error in %s __init__." % location)
raise ChimeraObjectException("Error in %s __init__." % location)
try:
for k, v in list(location.config.items()):
obj[k] = v
except (OptionConversionException, KeyError) as e:
log.exception("Error configuring %s." % location)
raise ChimeraObjectException("Error configuring %s. (%s)" %
(location, e))
# connect
obj.__setlocation__(location)
next = len(self.resources.getByClass(location.cls))
uri = self.adapter.connect(obj,
index=str(
Location(cls=location.cls, name=next)))
self.resources.add(location, obj, uri)
if start:
self.start(location)
return Proxy(uri=uri)
def remove(self, location):
"""
Remove the object pointed by 'location' from the system
stopping it before if needed.
@param location: The object to remove.
@type location: Location,str
@raises ObjectNotFoundException: When te request object or the Manager was not found.
@return: retuns True if sucessfull. False otherwise.
@rtype: bool
"""
if location not in self.resources:
raise ObjectNotFoundException("Location %s was not found." %
location)
self.stop(location)
resource = self.resources.get(location)
self.adapter.disconnect(resource.instance)
self.resources.remove(location)
return True
def start(self, location):
"""
Start the object pointed by 'location'.
@param location: The object to start.
@type location: Location or str
@raises ObjectNotFoundException: When te request object or the Manager was not found.
@raises ChimeraObjectException: Internal error on managed (user) object.
@return: retuns True if sucessfull. False otherwise.
@rtype: bool
"""
if location not in self.resources:
raise ObjectNotFoundException("Location %s was not found." %
location)
log.info("Starting %s." % location)
resource = self.resources.get(location)
if resource.instance.getState() == State.RUNNING:
return True
try:
resource.instance.__start__()
except Exception:
log.exception("Error running %s __start__ method." % location)
raise ChimeraObjectException("Error running %s __start__ method." %
location)
try:
# FIXME: thread exception handling
# ok, now schedule object main in a new thread
log.info("Running %s. __main___." % location)
loop = threading.Thread(target=resource.instance.__main__)
loop.setName(str(resource.location) + ".__main__")
loop.setDaemon(True)
loop.start()
resource.instance.__setstate__(State.RUNNING)
resource.created = time.time()
resource.loop = loop
return True
except Exception:
log.exception("Error running %s __main__ method." % location)
resource.instance.__setstate__(State.STOPPED)
raise ChimeraObjectException("Error running %s __main__ method." %
location)
def stop(self, location):
"""
Stop the object pointed by 'location'.
@param location: The object to stop.
@type location: Location or str
@raises ObjectNotFoundException: When the requested object or the Manager was not found.
@raises ChimeraObjectException: Internal error on managed (user) object.
@return: retuns True if sucessfull. False otherwise.
@rtype: bool
"""
if location not in self.resources:
raise ObjectNotFoundException("Location %s was not found." %
location)
log.info("Stopping %s." % location)
resource = self.resources.get(location)
try:
# stop control loop
if resource.loop and resource.loop.isAlive():
resource.instance.__abort_loop__()
try:
resource.loop.join()
except KeyboardInterrupt:
# ignore Ctrl+C on shutdown
pass
if resource.instance.getState() != State.STOPPED:
resource.instance.__stop__()
resource.instance.__setstate__(State.STOPPED)
return True
except Exception:
log.exception(
"Error running %s __stop__ method. Exception follows..." %
location)
raise ChimeraObjectException("Error running %s __stop__ method." %
location)
def getGUID(self):
return self.objectGUID
@staticmethod
def getPath():
return ChimeraPath()
