Class UWSTransitions
source code
object --+
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UWSTransitions
- Known Subclasses:
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An abstract base for classes defining the behaviour of a UWS.
This basically is the definition of a finite state machine with
arbitrary input (which is to say: the input "alphabet" is up to
the transitions).
A UWSTransitions instance is in the transitions attribute of a job
class.
The main interface to UWSTransitions is getTransition(p1, p2) -> callable
It returns a callable that should push the automaton from phase p1
to phase p2 or raise an ValidationError for a field phase.
The callable has the signature f(desiredPhase, wjob, input) -> None.
It must alter the uwsJob object as appropriate. input is some object
defined by the the transition. The job passed is a changeable job,
so the handlers actually hold locks to the job row. Thus, be brief.
The transitions are implemented as simple methods having the signature
of the callables returned by getTransition.
To link transistions and methods, pass a vertices list to the constructor.
This list consists of 3-tuples of strings (from, to, method-name). From and
to are phase names (use the symbols from this module to ward against typos).
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__init__(self,
name,
vertices)
x.__init__(...) initializes x; see help(type(x)) for signature |
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noOp(self,
newPhase,
job,
ignored)
a sample action just setting the new phase. |
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flagError(self,
newPhase,
wjob,
exception)
the default action when transitioning to an error: dump exception and
mark phase as ERROR.. |
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Inherited from object:
__delattr__,
__format__,
__getattribute__,
__hash__,
__new__,
__reduce__,
__reduce_ex__,
__repr__,
__setattr__,
__sizeof__,
__str__,
__subclasshook__
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Inherited from object:
__class__
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__init__(self,
name,
vertices)
(Constructor)
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x.__init__(...) initializes x; see help(type(x)) for signature
- Overrides:
object.__init__
- (inherited documentation)
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a sample action just setting the new phase.
This is a no-op baseline sometimes useful in user code.
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