General comment about Fuseki (or any server really):
Having server track the clients so it can initiate sending is a real
pain to do: clients go away, client crash without signing off, clients
get moved, clients go slow, etc etc.
Having the client poll the server may seem like excessive work but the
reality is that many systems are built that way underneath for all those
client reasons.
The trick is to make the "ping" cheap.
For RDF, keep triple with the tiemstamp of last change and get it each time.
Or to put it another way, do Last-Modified or ETags for the data.
Andy
On 09/08/18 17:29, Nouwt, B. (Barry) wrote:
Hi Claude, another hack that might work (but is probably a bit devious), is
using a GenericRuleReasoner rule instead of a ASK query, like:
[myAskRule: (?some pre:pattern bla:Eek) (?some eek:prop "1234"^^xsd:integer) (...) ->
print("The condition is TRUE!!!") customBuiltinThatNotifies(?some, "s...@eek.org") ]
Note that you would need to create a custom 'notification' Builtin that
contains the actual notification logic.
Regards, Barry
-----Original Message-----
From: ajs6f <aj...@apache.org>
Sent: donderdag 9 augustus 2018 16:59
To: users@jena.apache.org
Subject: Re: Push notification?
Hey, Claude--
Is it a particular ASK query or just any time any ASK query returns
successfully? I don't know enough about ARQ to really answer your question, but
a hack might be to see if there is an exact pattern of calls to find() that
occur for that ASK and only that ASK on the underlying DatasetGraph and use
DatasetGraphWrapper to intercept and fire your notifications. I'm guessing
there's a much cleaner better way to do that at ARQ, which will actually know
about ASK queries, and I'm looking forward to someone who knows more than I
telling us what that is. :grin:
ajs6f
On Aug 9, 2018, at 10:39 AM, Claude Warren <cla...@xenei.com> wrote:
Does anyone have a way to have Jena/Fuseki perform push notifications?
I am looking for a mechanism whereby I can create an ASK query and be
notified when it succeeds.
Any ideas would be appreciated.
--
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