[squeak-dev] inter-image communication and queueing suggestions?
gettimothy
gettimothy at zoho.com
Fri Oct 15 14:31:25 UTC 2021
your examples are now viewable in markdown at github here: https://github.com/gettimothy/Org-SmalltalkSockets/blob/main/SmalltalkSockets.md
And available as CustomHelp at squeaksource.com/Doc
---- On Fri, 15 Oct 2021 09:17:50 -0400 Marcel Taeumel <marcel.taeumel at hpi.de> wrote ----
Hi Herbert --
Thanks for the tip.
The example I provided should rather serve as a starting point to have a look at the proper classes and methods. It's details should not be treated as best practice. There can be other values or messages better suited for the job. It is advisable to use the Senders/Implementors tools to locate more examples in the environment.
Best,
Marcel
Am 15.10.2021 15:12:49 schrieb Herbert König <mailto:herbertkoenig at gmx.net>:
Hi Marcel,
to my best knowledge the first 32K of 64K possible ports are
occupied. https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers
So if you randomly choose one of them, you might get conflicts with
a service running on your computer on that port.
I always use port numbers at the upper end of the range.
Looking at the above page port 1234 is assigned by IANA to the
infoseek search agent and unofficially used by the VNC client.
Cheers,
Herbert
Am 15.10.2021 um 14:19 schrieb Marcel
Taeumel:
Hi Timothy --
Sockets work something like this (even though network name
resolving seems to be tricky on my Windows machine at the
moment):
| hostName port
serverSocket serverProcess clientSocket |
hostName :=
NetNameResolver localHostName.
port := 1234.
data := 'Hello
World!'.
serverSocket := Socket
newTCP.
serverSocket listenOn:
port.
serverProcess := [
|
receivedData |
serverSocket
waitForConnectionFor: 10 "seconds".
Transcript
showln: 'Server accepted client connection'.
receivedData
:= serverSocket receiveData.
Transcript
showln: 'Data received: ', receivedData.
serverSocket
closeAndDestroy.
] newProcess.
serverProcess
priority: Processor userBackgroundPriority.
serverProcess resume.
"or use #forkAt: directly on block"
clientSocket := Socket
newTCP.
clientSocket
connectTo:
(NetNameResolver addressFromString: hostName)
port:
port.
Transcript showln:
'Client connected to server'.
Transcript showln:
'Data sent: ', (clientSocket sendData: data), ' bytes'.
clientSocket
closeAndDestroy.
Best,
Marcel
Am 15.10.2021
13:34:07 schrieb gettimothy mailto:gettimothy at zoho.com:
Marcel,
Thank you.
I have not found any information on sockets in SBE or
PBE. I will continue too look.
In my exploring, I thought JSON looked
promising..pharo as a json server thingy that perhaps
squeak could consume.
IIRC Stomp, which I have used previously on squeak
has two side too, but I am not sure on this.
cheers,
t
---- On Fri, 15 Oct 2021 04:16:35
-0400 Marcel Taeumel mailto:marcel.taeumel at hpi.de wrote ----
Hi Timothy --
If it is just a text stream, use sockets. If
it is a data/byte stream ... well ... I am not
sure whether the byte interpretation for
structured objects is still compatible between
Pharo and Squeak.
Maybe you could also use a file and two file
streams, a writer in Pharo and a reader in
Squeak, as intermediary ...
Best,
Marcel
Am 14.10.2021
15:24:23 schrieb gettimothy via Squeak-dev
<mailto:squeak-dev at lists.squeakfoundation.org>:
Hi Folks,
I have used ApacheMQ(?) and Stomp in
squeak to communicate between squeak and a
C++ application, it worked well, but I
would like to avoid this for my project.
What I (will) have is a pharo image
that will parse a large XML document for
me (squeak has FileSystem
incompatabilities that SAXHandler etc
need) .
During a SAXHandler callback, I want to
kick this to an image that will parse some
data using a PEG grammar I wrote and that
needs some automated testing to perfect.
Communication I would like is pharo
(sax) -> squeak(xtreams-parsing).
Some basic reading showed rST from
about 2005? as a possibility as well as
Nebraska,which I believe has been removed
from Squeak several releases ago.
I have used neither of them.
If there is not a method I can make
work, then I will do
pharo(sax/stomp)->ApacheMQ->squeak(stomp/xtreams-parsing),
but I prefer a pure smalltalk mechanism.
I still have a textbook of mpq(?)
queues from a course I really enjoyed and
pharo(sax)->squeak(queueing)->squeak(xtreams-parsing) would be
really cool.
thx in advance.
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