On 26/04/16 18:15, David Jordan wrote:
I am looking at Javadoc-core, but do not see DatasetGraph in any of the
packages. Where is it?
In jena-arq.
jena-core is graph only - datasets arrived with SPARQL - making the
split today between jena-core and jena-arq somewhat historical.
Andy
-----Original Message-----
From: Andy Seaborne [mailto:[email protected]]
Sent: Tuesday, April 26, 2016 1:09 PM
To: [email protected]
Subject: Re: porting Jena onto new storage facility
On 26/04/16 18:04, David Jordan wrote:
Thanks. Most of these are in package org.apache.jena.graph, but not the
DatasetGraph interface.
-----Original Message-----
From: A. Soroka [mailto:[email protected]]
Sent: Tuesday, April 26, 2016 11:56 AM
To: [email protected]
Subject: Re: porting Jena onto new storage facility
This may require correction from a committer or more experienced dev, but I
think you are looking for the Node/Triple/Graph/DatasetGraph SPI. If you
implement that, your clients can use the public-facing
RDFNode/Statement/Model/Dataset API with your implementation underneath.
---
A. Soroka
The University of Virginia Library
On Apr 26, 2016, at 11:20 AM, David Jordan <[email protected]> wrote:
I am considering porting Jena onto a new storage framework. I had looked at
doing this a few years ago, but never did it. Now may be a better time. It also
runs in a cloud environment that supports multi-processing, etc. But the first
step is mapping of the data to the storage. I briefly looked at the latest
source. I thought there were some specific interfaces I had to implement to
plug in a new storage layer, but I have not found it yet. Any pointers are
appreciated.
You just need the DatasetGraph interface though if there are features the query
engine can take advantage of, then OpExecutor is a hook to see execution of a
query.
Node and Triple are fixed (by design).
Graphs, when graphs in a DatasetGraph, can be done with GraphView.
The code for TIM (Trasnactions In Memory) org.apache.jena.sparql.core.mem and
TDB org.apache.jena.tdb.store (and
OpExecutorTDB1) may help.
Andy
