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Result objects should close the sockets where the results come from #638

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jdferreira
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The XMLResult never closed the source file where the result was coming from, resulting in "too man opened files" being raised when processing large amounts of SPARQL queries. I have added a line of code to the appropriate file, but I am not sure whether other result parsers need to have the same type of fix added to them.

The XMLResult never closed the source file where the result was coming from, resulting in "too man opened files" being raised when processing large amounts of SPARQL queries
@jdferreira jdferreira changed the title Close the socket Result objects should close the sockets where the results come from Jul 7, 2016
@joernhees joernhees added bug Something isn't working parsing Related to a parsing. discussion labels Oct 15, 2016
@joernhees joernhees added this to the rdflib 4.2.2 milestone Oct 15, 2016
@joernhees
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tests fail... are you sure this behavior still exists in 4.2.2-dev (current master)?

@gromgull
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Since that method doesn't open the result, it also shouldn't close it.

However, the SPARQLStore probably should, here:

https://github.com/RDFLib/rdflib/blob/master/rdflib/plugins/stores/sparqlstore.py#L333

We could do:

with contextlib.closing(SPARQLWrapper.query(self).response) as res: return Result.parse(res)

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