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Posted to commits@jena.apache.org by bu...@apache.org on 2015/12/07 16:29:34 UTC
svn commit: r974856 - in /websites/staging/jena/trunk/content: ./
documentation/rdf/datasets.html
Author: buildbot
Date: Mon Dec 7 15:29:34 2015
New Revision: 974856
Log:
Staging update by buildbot for jena
Added:
websites/staging/jena/trunk/content/documentation/rdf/datasets.html
Modified:
websites/staging/jena/trunk/content/ (props changed)
Propchange: websites/staging/jena/trunk/content/
------------------------------------------------------------------------------
--- cms:source-revision (original)
+++ cms:source-revision Mon Dec 7 15:29:34 2015
@@ -1 +1 @@
-1717200
+1718404
Added: websites/staging/jena/trunk/content/documentation/rdf/datasets.html
==============================================================================
--- websites/staging/jena/trunk/content/documentation/rdf/datasets.html (added)
+++ websites/staging/jena/trunk/content/documentation/rdf/datasets.html Mon Dec 7 15:29:34 2015
@@ -0,0 +1,263 @@
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+<div class="container">
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+ <div id="breadcrumbs"></div>
+ <h1 class="title">In-memory, trasnactional Dataset</h1>
+ <style type="text/css">
+/* The following code is added by mdx_elementid.py
+ It was originally lifted from http://subversion.apache.org/style/site.css */
+/*
+ * Hide class="elementid-permalink", except when an enclosing heading
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+<p>The in-memory, transactional dataset provides a dataset with full ACID transaction semanticms, including abort. It provides for multiple readers and a writer concurrently
+together with full snapshot isolation of the dataset. Readers see an unchanging,
+consistent dataset where aggregate operations return stable results.</p>
+<p>First introduced in Jena version 3.0.1 as a beta, then in 3.1.0.</p>
+<p>During the beta phase, please log any issues with [Apache Jena JIRA|https://issues.apache.org/jira/issues/?jql=project%20%3D%20JENA%20ORDER%20BY%20key%20DESC%2C%20priority%20DESC].</p>
+<h2 id="api">API<a class="headerlink" href="#api" title="Permanent link">¶</a></h2>
+<p>A new instance of the class is obtained by a call to <code>DatasetFactory.createTxnMem()</code>:</p>
+<div class="codehilite"><pre><span class="n">Dataset</span> <span class="n">ds</span> <span class="p">=</span> <span class="n">DatasetFactory</span><span class="p">.</span><span class="n">createTxnMem</span><span class="p">()</span> <span class="p">;</span>
+</pre></div>
+
+
+<p>This can then be used by the application:</p>
+<div class="codehilite"><pre><span class="n">Dataset</span> <span class="n">ds</span> <span class="p">=</span> <span class="n">DatasetFactory</span><span class="p">.</span><span class="n">createTxnMem</span><span class="p">()</span> <span class="p">;</span>
+<span class="n">ds</span><span class="p">.</span><span class="n">begin</span><span class="p">(</span><span class="n">READ</span><span class="p">)</span> <span class="p">;</span>
+<span class="k">try</span> <span class="p">{</span>
+ <span class="p">...</span> <span class="n">SPARQL</span> <span class="n">query</span> <span class="p">...</span>
+<span class="p">}</span> <span class="n">finally</span> <span class="p">{</span> <span class="n">ds</span><span class="p">.</span><span class="k">end</span><span class="p">()</span> <span class="p">;</span> <span class="p">}</span>
+</pre></div>
+
+
+<p>or</p>
+<div class="codehilite"><pre><span class="n">Dataset</span> <span class="n">ds</span> <span class="p">=</span> <span class="n">DatasetFactory</span><span class="p">.</span><span class="n">createTxnMem</span><span class="p">()</span> <span class="p">;</span>
+<span class="n">ds</span><span class="p">.</span><span class="n">begin</span><span class="p">(</span><span class="n">WRITE</span><span class="p">)</span> <span class="p">;</span>
+<span class="k">try</span> <span class="p">{</span>
+ <span class="p">...</span> <span class="n">SPARQL</span> <span class="n">update</span> <span class="p">...</span>
+ <span class="p">...</span> <span class="n">SPARQL</span> <span class="n">query</span> <span class="p">...</span>
+ <span class="p">...</span> <span class="n">SPARQL</span> <span class="n">update</span> <span class="p">...</span>
+ <span class="n">ds</span><span class="p">.</span><span class="n">commit</span><span class="p">()</span> <span class="p">;</span>
+<span class="p">}</span> <span class="n">finally</span> <span class="p">{</span> <span class="n">ds</span><span class="p">.</span><span class="k">end</span><span class="p">()</span> <span class="p">;</span> <span class="p">}</span>
+</pre></div>
+
+
+<p>If the application does not call <code>commit()</code>, the transaction aborts and the changes are lost. The same happens if the application throws an exception.</p>
+<h2 id="non-transactional-use">Non-transactional use.<a class="headerlink" href="#non-transactional-use" title="Permanent link">¶</a></h2>
+<p>If used outside of a transaction, the implementation proiveds auto-commit functionality. Each triple or added or deleted is done inside an implicit transaction. This can lead to
+measurable slow down. It is better to do a group of operations inside a single transaction
+explicitly in the application code.</p>
+<h2 id="assembler">Assembler<a class="headerlink" href="#assembler" title="Permanent link">¶</a></h2>
+<p>The assembler provies for the creation of a dataset and also loading it with data read from URLs (files or from any other URL).</p>
+<ul>
+<li>
+<p>Type: <code>ja:MemoryDataset</code></p>
+</li>
+<li>
+<p>Properties:</p>
+</li>
+<li><code>ja:data</code> <i><code>urlForData</code></i></li>
+<li><code>ja:pNamedGraph</code>, for loading a specific graph of the dataset.
+ This uses <code>ja:graphName</code> to specific the name and <code>ja:data</code> to load data.</li>
+</ul>
+<p>The examples use the following prefixes:</p>
+<div class="codehilite"><pre><span class="p">@</span><span class="n">prefix</span> <span class="n">ja</span><span class="p">:</span> <span class="o"><</span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">jena</span><span class="p">.</span><span class="n">hpl</span><span class="p">.</span><span class="n">hp</span><span class="p">.</span><span class="n">com</span><span class="o">/</span>2005<span class="o">/</span>11<span class="o">/</span><span class="n">Assembler</span>#<span class="o">></span> <span class="p">.</span>
+<span class="p">@</span><span class="n">prefix</span> <span class="n">rdf</span><span class="p">:</span> <span class="o"><</span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">www</span><span class="p">.</span><span class="n">w3</span><span class="p">.</span><span class="n">org</span><span class="o">/</span>1999<span class="o">/</span>02<span class="o">/</span>22<span class="o">-</span><span class="n">rdf</span><span class="o">-</span><span class="n">syntax</span><span class="o">-</span><span class="n">ns</span>#<span class="o">></span> <span class="p">.</span>
+</pre></div>
+
+
+<p>To create an empty in-memory dataset, all that is required is the line:</p>
+<div class="codehilite"><pre><span class="p">[]</span> <span class="n">rdf</span><span class="p">:</span><span class="n">type</span> <span class="n">ja</span><span class="p">:</span><span class="n">MemoryDataset</span> <span class="p">.</span>
+</pre></div>
+
+
+<p>With triples for the default graph, from file "dataFile.ttl", Turtle format.</p>
+<div class="codehilite"><pre><span class="p">[]</span> <span class="n">rdf</span><span class="p">:</span><span class="n">type</span> <span class="n">ja</span><span class="p">:</span><span class="n">MemoryDataset</span> <span class="p">;</span>
+ <span class="n">ja</span><span class="p">:</span><span class="n">data</span> <span class="o"><</span><span class="n">file</span><span class="p">:</span><span class="n">dataFile</span><span class="p">.</span><span class="n">ttl</span><span class="o">></span> <span class="p">.</span>
+</pre></div>
+
+
+<p>With triples from several files</p>
+<div class="codehilite"><pre><span class="p">[]</span> <span class="n">rdf</span><span class="p">:</span><span class="n">type</span> <span class="n">ja</span><span class="p">:</span><span class="n">MemoryDataset</span> <span class="p">;</span>
+ <span class="n">ja</span><span class="p">:</span><span class="n">data</span> <span class="o"><</span><span class="n">file</span><span class="p">:</span><span class="n">data1</span><span class="p">.</span><span class="n">ttl</span><span class="o">></span> <span class="p">;</span>
+ <span class="n">ja</span><span class="p">:</span><span class="n">data</span> <span class="o"><</span><span class="n">file</span><span class="p">:</span><span class="n">data2</span><span class="p">.</span><span class="n">nt</span><span class="o">></span> <span class="p">;</span>
+ <span class="n">ja</span><span class="p">:</span><span class="n">data</span> <span class="o"><</span><span class="n">file</span><span class="p">:</span><span class="n">data3</span><span class="p">.</span><span class="n">jsonld</span><span class="o">></span> <span class="p">;</span>
+ <span class="p">.</span>
+</pre></div>
+
+
+<p>Load TriG:</p>
+<div class="codehilite"><pre><span class="p">[]</span> <span class="n">rdf</span><span class="p">:</span><span class="n">type</span> <span class="n">ja</span><span class="p">:</span><span class="n">MemoryDataset</span> <span class="p">;</span>
+ <span class="n">ja</span><span class="p">:</span><span class="n">data</span> <span class="o"><</span><span class="n">file</span><span class="p">:</span><span class="n">data</span><span class="p">.</span><span class="n">trig</span><span class="o">></span> <span class="p">.</span>
+</pre></div>
+
+
+<p>Load a file of triples, put into a named graph.</p>
+<div class="codehilite"><pre><span class="p">[]</span> <span class="n">rdf</span><span class="p">:</span><span class="n">type</span> <span class="n">ja</span><span class="p">:</span><span class="n">MemoryDataset</span> <span class="p">;</span>
+ <span class="n">ja</span><span class="p">:</span><span class="n">namedGraph</span> <span class="p">[</span> <span class="n">ja</span><span class="p">:</span><span class="n">graphName</span> <span class="o"><</span><span class="n">http</span><span class="p">:</span><span class="o">//</span><span class="n">example</span><span class="o">/</span><span class="n">graph</span><span class="o">></span> <span class="p">;</span> <span class="n">ja</span><span class="p">:</span><span class="n">data</span> <span class="o"><</span><span class="n">file</span><span class="p">:</span><span class="o">///</span><span class="n">fullPath</span><span class="o">/</span><span class="n">data</span><span class="p">.</span><span class="n">ttl</span><span class="o">></span> <span class="p">]</span> <span class="p">.</span>
+</pre></div>
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