April 2024 - This site, and Kamaelia are being updated. There is significant work needed, and PRs are welcome.
One-shot sending data
OneShot and TriggeredOneShot send a single specified item to their
"outbox" outbox and immediately terminate.
TriggeredOneShot waits first for anything to arrive at its "inbox"
inbox, whereas OneShot acts as soon as it is activated.
Example Usage
A way to create a component that writes data to a given filename,
based on (filename,data) messages sent to its "next" inbox:
Carousel( lambda filename, data :
Pipeline( OneShot(data),
SimpleFileWriter(filename),
),
)
A graphline that opens a TCP connection to myserver.com port 1500,
and sends an a one off message:
Pipeline( OneShot("data to send to server"),
TCPClient("myserver.com", 1500),
).run()
Shutting down a connection to myserver.com port 1500 as soon as a
reply is received from the server:
Graphline( NET = TCPClient("myserver.com", 1500),
SPLIT = TwoWaySplitter(),
STOP = TriggeredOneShot(producerFinished()),
linkages = {
("", "inbox" ) : ("NET", "inbox"),
("NET", "outbox") : ("SPLIT", "inbox"),
("SPLIT", "outbox") : ("", "outbox"),
("SPLIT", "outbox2") : ("STOP", "inbox"),
("STOP", "outbox") : ("NET", "control"),
("", "control") : ("NET", "control"),
("NET", "signal") : ("SPLIT", "control"),
("SPLIT", "signal") : ("", "signal"),
("SPLIT", "signal2"),: ("STOP", "control"),
},
)
OneShot Behaviour
At initialisation, specify the message to be sent by OneShot.
As soon as OneShot is activated, the specified message is sent out of
the "outbox" outbox. A producerFinished message is also sent out of the
"signal" outbox. The component then immediately terminates.
TriggeredOneShot
Behaviour
At initialisation, specify the message to be sent by
TriggeredOneShot.
Send anything to the "inbox" inbox and TriggeredOneShot will
immediately send the specified message out of the "outbox" outbox. A
producerFinished message is also sent out of the "signal" outbox. The
component then immediately terminates.
If a producerFinished or shutdownMicroprocess message is received on
the "control" inbox. It is immediately sent on out of the "signal"
outbox and the component then immediately terminates.
OneShot(msg) -> new OneShot component.
Immediately sends the specified message and terminates.
Keyword arguments:
- msg -- the message to send out
Inboxes
- control : Shutdown signalling
- inbox : NOT USED
Outboxes
- outbox : Item is sent out here
- signal : Shutdown signalling
Methods defined here
Warning!
You should be using the inbox/outbox interface, not these methods
(except construction). This documentation is designed as a roadmap as to
their functionalilty for maintainers and new component developers.
__init__(self[, msg])
x.__init__(...) initializes x; see x.__class__.__doc__ for
signature
main(self)
Main loop
OneShot(msg) -> new OneShot component.
Waits for anything to arrive at its "inbox" inbox, then immediately
sends the specified message and terminates.
Keyword arguments:
- msg -- the message to send out
Inboxes
- control : Shutdown signalling
- inbox : Anything, as trigger
Outboxes
- outbox : Item is sent out here
- signal : Shutdown signalling
Methods defined here
Warning!
You should be using the inbox/outbox interface, not these methods
(except construction). This documentation is designed as a roadmap as to
their functionalilty for maintainers and new component developers.
__init__(self[, msg])
x.__init__(...) initializes x; see x.__class__.__doc__ for
signature
main(self)
Main loop
Got a problem with the documentation? Something unclear that could be
clearer? Want to help improve it? Constructive criticism is very welcome
- especially if you can suggest a better rewording!
