def load(self, cfg, compositeLookup):
"""
load graph from config dictionary (inverse operation of save(...))
:param cfg: dictionary loaded from json file
:return: None
"""
# apply subconfig gui state
if "_guiState" in cfg and len(cfg["_guiState"]) > 0:
guistateCC = self._propertyCollection.getChildCollection(
"_guiState")
for k in cfg["_guiState"]:
PropertyCollectionImpl(k, guistateCC, cfg["_guiState"][k])
for n in cfg["nodes"]:
if not n["library"].startswith("composite://"):
p = PropertyCollectionImpl(n["name"], self._propertyCollection,
n["properties"])
# apply node gui state
nextP = PropertyCollectionImpl("_nexxT", p,
{"thread": n["thread"]})
logger.debug("loading: subconfig %s / node %s -> thread: %s",
self._name, n["name"], n["thread"])
tmp = self._graph.addNode(n["library"],
n["factoryFunction"],
suggestedName=n["name"])
if tmp != n["name"]:
raise NexTInternalError(
"addNode(...) has set unexpected name for node.")
else:
# composite node handling
if n["library"] == "composite://port":
# the special nodes are already there, nothing to do here
pass
elif n["library"] == "composite://ref":
name = n["factoryFunction"]
cf = compositeLookup(name)
tmp = self._graph.addNode(cf,
"compositeNode",
suggestedName=n["name"])
if tmp != n["name"]:
raise NexTInternalError(
"addNode(...) has set unexpected name for node.")
for dip in n["dynamicInputPorts"]:
self._graph.addDynamicInputPort(n["name"], dip)
for dop in n["dynamicOutputPorts"]:
self._graph.addDynamicOutputPort(n["name"], dop)
# make sure that the filter is instantiated and the port information is updated immediately
self._graph.getMockup(n["name"]).createFilterAndUpdate()
for c in cfg["connections"]:
contuple = self.connectionStringToTuple(c)
self._graph.addConnection(*contuple)
def __init__(self, name):
"""
Creates a NexTThread instance with a name. If this is not the main thread, create a corresponding
QThread and start it (i.e., the event loop).
:param name: name of the thread
"""
super().__init__()
self._filters = {}
self._filter2name = {}
self._mockups = {}
self._name = name
try:
self._profsrv = Services.getService("Profiling")
if hasattr(self._profsrv, "data") and self._profsrv.data() is None:
self._profsrv = None
except KeyError:
self._profsrv = None
if not self.thread() is QCoreApplication.instance().thread():
raise NexTInternalError("unexpected thread")
if name == "main":
self._qthread = QCoreApplication.instance().thread()
self._qthread.setObjectName(name)
else:
self._qthread = self.ThreadWithCoverage(parent=self)
self._qthread.setObjectName(name)
self._qthread.start()
self.moveToThread(self._qthread)
self.cleanUpCalled = False
def preStateTransition(self, operation):
"""
State transitions might be explicitely set all filters to the operation state before executing the
operation on the filters. This method makes sure that the state transitions are sane.
:param operation: The FilterState operation.
:return: None
"""
logger.internal("Performing pre-state transition: %s", FilterState.state2str(operation))
self._assertMyThread()
if self.getPlugin() is None or (useCImpl and self.getPlugin().data() is None):
raise NexTInternalError("Cannot perform state transitions on uninitialized plugin")
operations = {
FilterState.CONSTRUCTING: (None, FilterState.CONSTRUCTED, None),
FilterState.INITIALIZING: (FilterState.CONSTRUCTED, FilterState.INITIALIZED, self.getPlugin().onInit),
FilterState.OPENING: (FilterState.INITIALIZED, FilterState.OPENED, self.getPlugin().onOpen),
FilterState.STARTING: (FilterState.OPENED, FilterState.ACTIVE, self.getPlugin().onStart),
FilterState.STOPPING: (FilterState.ACTIVE, FilterState.OPENED, self.getPlugin().onStop),
FilterState.CLOSING: (FilterState.OPENED, FilterState.INITIALIZED, self.getPlugin().onClose),
FilterState.DEINITIALIZING: (FilterState.INITIALIZED, FilterState.CONSTRUCTED, self.getPlugin().onDeinit),
FilterState.DESTRUCTING: (FilterState.CONSTRUCTED, None, None),
}
fromState, toState, function = operations[operation]
if self._state != fromState:
raise FilterStateMachineError(self._state, operation)
self._state = operation
def assertMainThread():
"""
assert that function is called in main thread, otherwise, a NexTInternalError is raised
:return: None
"""
if not isMainThread():
raise NexTInternalError("Non thread-safe function is called in unexpected thread.")
def waitForSignal(signal, callback=None, timeout=None):
"""
Waits for the given signal. If a callback is given, it will be called with the signal's arguments until the
return value of the callback evaluates to true. If a timeout is given (in seconds), a TimeoutError will be
thrown after the time has elapsed.
:param signal: a Qt signal to be waited for, suitable for slot connections.
:param callback: a callable called
:param timeout: an optional timeout in seconds.
:return: None
"""
_received = False
_sigArgs = None
def _slot(*args, **kw):
nonlocal _received, _sigArgs
_sigArgs = args
if callback is None:
_received = True
else:
if callback(*args, **kw):
_received = True
if not signal.connect(_slot, Qt.QueuedConnection):
raise NexTInternalError("cannot connect the signal.")
t0 = time.perf_counter()
while not _received:
QCoreApplication.processEvents()
if timeout is not None and time.perf_counter() - t0 > timeout:
signal.disconnect(_slot)
raise TimeoutError()
signal.disconnect(_slot)
return _sigArgs
def applyLoadedConfig(self, loadedFromConfig):
"""
applies the loaded configuration after the instance has been already created. This is used for guiState items.
:param loadedFromConfig: dictionary loaded from json file
:return: None
"""
if len(self._loadedFromConfig) > 0:
raise NexTInternalError("Expected that no loaded config is present.")
self._accessed = False
self._loadedFromConfig = loadedFromConfig
def __init__(self, name, parentPropColl, loadedFromConfig=None):
PropertyCollection.__init__(self)
assertMainThread()
self._properties = {}
self._accessed = False # if no access to properties has been made, we stick with configs from config file.
self._loadedFromConfig = loadedFromConfig if loadedFromConfig is not None else {}
self._propertyMutex = QMutex(QMutex.Recursive)
if parentPropColl is not None:
if not isinstance(parentPropColl, PropertyCollectionImpl):
raise NexTInternalError("parentPropColl should always be a property collection instance but it isn't")
parentPropColl.addChild(name, self)
def subConfigByNameAndTye(self, name, typeid):
"""
Return the subconfiguration with the given name and type
:param name: a string
:param typeid: either CONFIG_TYPE_APPLICATION or CONFIG_TYPE_COMPOSITE
:return: a SubConfiguration instance
"""
if typeid == self.CONFIG_TYPE_APPLICATION:
return self.applicationByName(name)
if typeid == self.CONFIG_TYPE_COMPOSITE:
return self.compositeFilterByName(name)
raise NexTInternalError("unknown typeid %s" % typeid)
def applicationByName(self, name):
"""
Search for the application with the given name
:param name: a string
:return: an Application instance
"""
match = [app for app in self._applications if app.getName() == name]
if len(match) == 1:
return match[0]
if len(match) == 0:
raise NodeNotFoundError(name)
raise NexTInternalError("non unique name %s" % name)
def compositeFilterByName(self, name):
"""
Search for the composite filter with the given name
:param name: a string
:return: a CompositeFilter instance
"""
match = [cf for cf in self._compositeFilters if cf.getName() == name]
if len(match) == 1:
return match[0]
if len(match) == 0:
raise NodeNotFoundError(name)
raise NexTInternalError("non unique name %s" % name)
def _receiveSync(self, dataSample):
"""
Called from framework only and implements the synchronous receive mechanism.
:param dataSample: the transmitted DataSample instance
:return: None
"""
if not QThread.currentThread() is self.thread():
raise NexTInternalError(
"InputPort.receiveSync has been called from an unexpected thread."
)
self._addToQueue(dataSample)
self._transmit()
def adaptLibAndFactory(lib, factory):
if not isinstance(lib, str):
if factory in ["CompositeInputNode", "CompositeOutputNode"]:
ncfg["library"] = "composite://port"
ncfg["factoryFunction"] = factory[:-len("Node")]
elif factory in ["compositeNode"]:
ncfg["library"] = "composite://ref"
ncfg["factoryFunction"] = lib.getName()
else:
raise NexTInternalError("Unexpected factory function '%s'" % factory)
else:
ncfg["library"] = lib
ncfg["factoryFunction"] = factory
return lib, factory
def __init__(self, name, configuration):
super().__init__(name, configuration)
self._configuration = configuration
_compositeInputNode = self._graph.addNode(CompositeFilter,
"CompositeInputNode",
"CompositeInput")
_compositeOutputNode = self._graph.addNode(CompositeFilter,
"CompositeOutputNode",
"CompositeOutput")
if _compositeInputNode != "CompositeInput" or _compositeOutputNode != "CompositeOutput":
raise NexTInternalError("unexpected node names.")
# prevent renaming and deletion of these special nodes
self._graph.protect("CompositeInput")
self._graph.protect("CompositeOutput")
configuration.addComposite(self)
def shutdown(self):
"""
Transfer graph to DESTRUCTED state.
:return: None
"""
assertMainThread()
if self._state == FilterState.ACTIVE:
self.stop()
# while this is similar to code in FilterEnvironment, the lines here refer to applications
# and the lines in FilterEnvironment refer to filters.
if self._state == FilterState.OPENED:
self.close()
if self._state == FilterState.INITIALIZED:
self.deinit()
if self._state == FilterState.CONSTRUCTED:
self.destruct()
if not self._state == FilterState.DESTRUCTED:
raise NexTInternalError("Unexpected state '%s' after shutdown." %
FilterState.state2str(self._state))
def _stateTransition(self, operation):
"""
Perform state transition according to operation.
:param operation: The FilterState operation.
:return: None
"""
logger.internal("Performing state transition: %s", FilterState.state2str(operation))
self._assertMyThread()
if self.getPlugin() is None or (useCImpl and self.getPlugin().data() is None):
raise NexTInternalError("Cannot perform state transitions on uninitialized plugin")
operations = {
FilterState.CONSTRUCTING: (None, FilterState.CONSTRUCTED, None),
FilterState.INITIALIZING: (FilterState.CONSTRUCTED, FilterState.INITIALIZED, self.getPlugin().onInit),
FilterState.OPENING: (FilterState.INITIALIZED, FilterState.OPENED, self.getPlugin().onOpen),
FilterState.STARTING: (FilterState.OPENED, FilterState.ACTIVE, self.getPlugin().onStart),
FilterState.STOPPING: (FilterState.ACTIVE, FilterState.OPENED, self.getPlugin().onStop),
FilterState.CLOSING: (FilterState.OPENED, FilterState.INITIALIZED, self.getPlugin().onClose),
FilterState.DEINITIALIZING: (FilterState.INITIALIZED, FilterState.CONSTRUCTED, self.getPlugin().onDeinit),
FilterState.DESTRUCTING: (FilterState.CONSTRUCTED, None, None),
}
fromState, toState, function = operations[operation]
# filters must be either in fromState or already in operation state (if preStateTransition has been used)
if self._state not in (fromState, operation):
raise FilterStateMachineError(self._state, operation)
self._state = operation
try:
function()
except Exception as e: # pylint: disable=broad-except
# What should be done on errors?
# 1. inhibit state transition to higher state
# pro: prevent activation of not properly intialized filter
# con: some actions of onInit might already be executed, we really want to call onDeinit for cleanup
# 2. ignore the exception and perform state transition anyways
# pro/con is inverse to 1
# 3. introduce an error state
# pro: filters in error state are clearly identifyable and prevented from being used
# con: higher complexity, cleanup issues, ...
# --> for now we use 2.
self._state = fromState
logger.exception("Exception while executing operation %s of filter %s",
FilterState.state2str(operation),
self.propertyCollection().objectName())
self._state = toState
def _receiveAsync(self, dataSample, semaphore):
"""
Called from framework only and implements the asynchronous receive mechanism using a semaphore.
:param dataSample: the transmitted DataSample instance
:param semaphore: a QSemaphore instance
:return: None
"""
if not QThread.currentThread() is self.thread():
raise NexTInternalError(
"InputPort.receiveAsync has been called from an unexpected thread."
)
self._addToQueue(dataSample)
if not self._interthreadDynamicQueue:
# usual behaviour
semaphore.release(1)
self._transmit()
else:
if semaphore not in self._semaphoreN:
self._semaphoreN[semaphore] = 1
delta = self._semaphoreN[semaphore] - len(self.queue)
if delta <= 0:
# the semaphore's N is too small
semaphore.release(1 - delta)
self._semaphoreN[semaphore] += -delta
logger.internal("delta = %d: semaphoreN = %d", delta,
self._semaphoreN[semaphore])
self._transmit()
elif delta > 0:
# first acquire is done by caller
self._semaphoreN[semaphore] -= 1
# the semaphore's N is too large, try acquires to reduce the size
for i in range(1, delta):
if semaphore.tryAcquire(1):
self._semaphoreN[semaphore] -= 1
else:
break
logger.internal("delta = %d: semaphoreN = %d", delta,
self._semaphoreN[semaphore])
self._transmit()
