Hi, I'm messing with SPARQL/RDF using aristotle. I'd like to write RDF queries that hit dbpedia/wikidata. aristotle wants an implementation of Jena's Graph interface, but all the SPARQL stuff seems to skip the Graph and just take a SPARQL query. I managed to get Jena working directly:

(let [q (QueryFactory/create "SELECT ?prop ?place WHERE {  ?prop ?place .}")
        qx (QueryExecutionFactory/sparqlService "" q)]
    (.addParam ^QueryEngineHTTP qx "timeout" "10000")
    (ResultSetFormatter/out System/out (.execSelect qx) q))

(-> "" RDFConnectionFactory/connect .fetch .getGraph)

Hi

Do you guys know a way to easaly copy/clone an InputStream without consuming it. OR if i really need to consume it (I think i cant scape this) how do i easaly clone it

Mi idea is to clone it and then just async log its data

Like copying it to an output stream for instance?

Not sure if this is what you are looking for but the first example here can help: https://clojuredocs.org/clojure.java.io/input-stream#example-5542a631e4b01bb732af0a8f

maybe. but. there where he is copying isnt he consuming the stream?

meaning xin is consumed right?

Yeah. Byte array is loaded to memory i guess, not quite effective for very large files

cool I want it so that its not consumed. but i think i cant really do that right

i think ill just create a function that takes an input stream and returns two. consuming one and creating two out of that one

makes sense?

Yes makes sense. What i am not sure is if it will be loaded to memory when you are creating it and for every time you are creating another one out of the main one.

If the original content is a file it would be better to use with open, return a lazy seq, do your ops on the lazy sequence before realizing them only when necessary. There is an example in the clojure docs let me try to find it.

Assuming, the loading to memory is done three times as stated earlier. Ps: I stand to be corrected, i haven't really worked with streams in CLJ, so i might be misinterpreting the clojure operation on Input streams, just done them in java.

cool thanks.

I do have a solution BTW

meaning im currently consuming it loggind the data and recreating it

I was just wondering if there was an easier way, or a way of avoid consuming it

I dont think there is. because of it being a stream

not easier really since it just a one-liner but a way to avoid consuming it

var question 1: has anyone here ever relied on the thread-safety of alter-var-root directly?

var question 2: why is there a method doReset? I don't see it used anywhere

var question 3: what is the rev counter for?

on 3, it's unused, was from some older version. there's a jira to remove that.

on 2, that's an impl of the Settable interface, which Var implements

I don't think the Settable stuff is used from anywhere, so that's probably legacy stuff too I'd guess

on 1, not sure what you're asking

Well, there isn't a function in clojure called reset-var-root, only alter-var-root that can atomically swap the value of a var, so I wonder what's the reason for that: I usually only need to set the root value of a var, but not atomically using a function. Why is it important for vars to have this feature / property?

funny, it seems with-open generates one redundant expression:

(macroexpand '(with-open [a b]))
(let* [a b] (try (clojure.core/with-open []) (finally (. a clojure.core/close))))

Hey Clojurians !

doesn't that macroexpand out by the end?

any naming conventions for futures that people like besides appending -future ?

e.g.

(let [names-future (future (get-names ...))
      names @names-future]
 ...)

I've seen the use of * to indicate derefable values.

(let [*my-atom (atom nil)])

Yes, seen that with atoms but could make sense with all dereferables

Is there a library rather than http-kit that can be more reliable? Using http kit has gave me some headaches in terms of querying some API endpoints that return data but http kit treats the response as text

clj-http - it has support for automatic coercions

or deserialization/serialization of data

ahh yes. It is kind of annoying to deref my responses

hello all, is there any way to see a parent dependency of a lib?

like what this lib commons-compress-1.8.jar came from?

which tool are you using?

boot

I tried boot show -d

but it shows only 1st level

sorry, don't know about boot

so you know in lein?

lein deps :tree

I´ll create project.clj to see the dep tree

clj -Stree in clj

I´m Windows guy :-

@fabrao You can install clj for Windows via Scoop -- it's a nice package manager 🙂

See https://github.com/littleli/scoop-clojure and https://github.com/clojure/tools.deps.alpha/wiki/clj-on-Windows -- it's what I use on Windows.

@fabrao boot show -d shows the full dependency tree for me:

[ring "1.6.0-beta6"]
├── [ring/ring-core "1.6.0-beta6"]
│   ├── [clj-time "0.11.0"]
│   ├── [commons-fileupload "1.3.2"]
│   ├── [commons-io "2.5"]
│   ├── [crypto-equality "1.0.0"]
│   └── [crypto-random "1.2.0"]
├── [ring/ring-devel "1.6.0-beta6"]
│   ├── [clj-stacktrace "0.2.8"]
│   ├── [hiccup "1.0.5"]
│   └── [ns-tracker "0.3.0"]
│       ├── [org.clojure/java.classpath "0.2.2"]
│       └── [org.clojure/tools.namespace "0.2.10"]

@seancorfield thanks

(that's with boot 2.7.2)

boot show -d
[com.climate/claypoole "1.1.4"]
[com.microsoft.sqlserver/mssql-jdbc "7.0.0.jre8"]
[com.taoensso/timbre "4.10.0"]
??? [com.taoensso/encore "2.91.0"]
?   ??? [com.taoensso/truss "1.5.0"]
?   ??? [org.clojure/tools.reader "0.10.0"]
??? [io.aviso/pretty "0.1.33"]
[lock-key "1.5.0"]
??? [base64-clj "0.1.1"]
??? [charset "1.2.1"]
[mount "0.1.16"]
[org.apache.poi/ooxml-schemas "1.4"]
??? [org.apache.xmlbeans/xmlbeans "3.0.1"]
[org.apache.poi/poi-ooxml "4.1.1"]
??? [com.github.virtuald/curvesapi "1.06"]
??? [org.apache.commons/commons-compress "1.19"]
??? [org.apache.poi/poi-ooxml-schemas "4.1.1"]
[org.apache.poi/poi "4.1.1"]
??? [commons-codec "1.13"]
??? [org.apache.commons/commons-collections4 "4.4"]
??? [org.apache.commons/commons-math3 "3.6.1"]
[org.clojure/clojure "1.10.1"]
??? [org.clojure/core.specs.alpha "0.2.44"]
??? [org.clojure/spec.alpha "0.2.176"]
[org.clojure/java.classpath "0.3.0"]
[org.jfree/jfreechart "1.5.0"]
[org.jfree/jfreesvg "3.3"]
[overtone/at-at "1.2.0"]
[seancorfield/next.jdbc "1.0.10"]
??? [org.clojure/java.data "0.1.4"]
    ??? [org.clojure/tools.logging "0.2.3"]

using [org.clojure/java.classpath "0.3.0"] I can´t see [org.apache.commons/commons-compress "1.18"] in dep tree

where is it came from?

dep tree of dep tree of ... ?

clojure use what version ? 1.19 or 1.18?

@fabrao If you believe you have a conflict, use boot show -p -- pedantic mode -- which will show you all possible conflicts, how they were resolved, and which dependency brought them in.