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https://issues.apache.org/jira/browse/JENA-1146?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15175396#comment-15175396
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Joël Kuiper edited comment on JENA-1146 at 3/2/16 10:27 AM:
------------------------------------------------------------
Yep this makes sense to me! For completeness sake the (Clojure code) we use
right now. But it's pretty much identical.
<pre>
(defn build-text-index!
"Builds text index from dataset in TDB identified by assembler-file.
Returns nil. Accesses internals of textindexer class.
https://github.com/apache/jena/blob/master/jena-text/src/main/java/jena/textindexer.java";
[assembler-file]
(info "Building text index on TDB")
(let [params [(Class/forName "[Ljava.lang.String;")]
args (into-array String [(str "--desc=" assembler-file)])
instance (du/call-constructor jena.textindexer params args)]
(.mainRun instance)
(.close (du/get-field jena.textindexer "textIndex" instance))
(.close (du/get-field jena.textindexer "dataset" instance))
nil))
(defn call-constructor
"Calls a private or public sonstructor of klass that has
given params (a collection of classes), passing args as argument
list into constructor."
[klass params & args]
(-> klass (.getDeclaredConstructor (into-array Class params))
(doto (.setAccessible true))
(.newInstance (into-array Object args))))
(defn get-field
"Returns obj's private or public field with given field-name,
defined in klass. Pass nil into obj for static fields."
[klass field-name obj]
(-> klass (.getDeclaredField (name field-name))
(doto (.setAccessible true))
(.get obj)))
</pre>
was (Author: joelkuiper):
Yep this makes sense to me! For completeness sake the (Clojure code) we use
right now. But it's pretty much identical.
(defn build-text-index!
"Builds text index from dataset in TDB identified by assembler-file.
Returns nil. Accesses internals of textindexer class.
https://github.com/apache/jena/blob/master/jena-text/src/main/java/jena/textindexer.java";
[assembler-file]
(info "Building text index on TDB")
(let [params [(Class/forName "[Ljava.lang.String;")]
args (into-array String [(str "--desc=" assembler-file)])
instance (du/call-constructor jena.textindexer params args)]
(.mainRun instance)
(.close (du/get-field jena.textindexer "textIndex" instance))
(.close (du/get-field jena.textindexer "dataset" instance))
nil))
(defn call-constructor
"Calls a private or public sonstructor of klass that has
given params (a collection of classes), passing args as argument
list into constructor."
[klass params & args]
(-> klass (.getDeclaredConstructor (into-array Class params))
(doto (.setAccessible true))
(.newInstance (into-array Object args))))
(defn get-field
"Returns obj's private or public field with given field-name,
defined in klass. Pass nil into obj for static fields."
[klass field-name obj]
(-> klass (.getDeclaredField (name field-name))
(doto (.setAccessible true))
(.get obj)))
> jena.textindexer does not close resources
> ------------------------------------------
>
> Key: JENA-1146
> URL: https://issues.apache.org/jira/browse/JENA-1146
> Project: Apache Jena
> Issue Type: Bug
> Components: Cmd line tools, Jena, Text
> Affects Versions: Jena 3.0.1
> Reporter: Joël Kuiper
> Assignee: Osma Suominen
> Priority: Minor
> Fix For: Jena 3.1.0
>
>
> This is a bit of a minor issue since the jena.textindexer is meant to be ran
> from the command line. But in our app we call it directly from the JVM
> process and then proceed to do some other operations. This fails when also
> using the text index, since Lucene can't acquire a lock in that case (it's
> limited to one connection). As a work-around we now set the textIndex and
> dataset fields to public using reflection, and manually close the resources.
> But ideally this should happen after the main command body.
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