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Posted to commits@jena.apache.org by bu...@apache.org on 2016/08/09 09:18:45 UTC
svn commit: r994794 - in /websites/staging/jena/trunk/content: ./
documentation/txn/index.html documentation/txn/transactions.html
Author: buildbot
Date: Tue Aug 9 09:18:45 2016
New Revision: 994794
Log:
Staging update by buildbot for jena
Added:
websites/staging/jena/trunk/content/documentation/txn/index.html
Removed:
websites/staging/jena/trunk/content/documentation/txn/transactions.html
Modified:
websites/staging/jena/trunk/content/ (props changed)
Propchange: websites/staging/jena/trunk/content/
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Added: websites/staging/jena/trunk/content/documentation/txn/index.html
==============================================================================
--- websites/staging/jena/trunk/content/documentation/txn/index.html (added)
+++ websites/staging/jena/trunk/content/documentation/txn/index.html Tue Aug 9 09:18:45 2016
@@ -0,0 +1,237 @@
+<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
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+<div class="container">
+ <div class="row">
+ <div class="col-md-12">
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+ <h1 class="title">Jena Transactions</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>This page gives an overview of transactions in Jena.</p>
+<p>There are two API for transactions: the <a href="transactions_api.html">basic transaction
+interface</a> styled after the conventional
+<code>begin</code>-<code>commit</code> and a <a href="#txn.html">higher level <code>Txn</code> API</a> that builds
+on the basic API using Java8 features.</p>
+<h2 id="apis">APIs<a class="headerlink" href="#apis" title="Permanent link">¶</a></h2>
+<ul>
+<li><a href="transactions_api.html">Basic API for Transactions</a></li>
+<li><a href="txn.html">Txn, a high level API to transactions</a></li>
+</ul>
+<h2 id="overview">Overview<a class="headerlink" href="#overview" title="Permanent link">¶</a></h2>
+<p>Transaction provide applications with a safe way to use and update data between
+threads. The properies of transactions are <a href="https://en.wikipedia.org/wiki/ACID">ACID</a>
+- Atomic, Consistent, Isolation, Durable -
+meaning that groups of changes are made visible to other transactions
+in a single unit or all chnages are not at all, and when made chnages are not
+reversed, or the case of persistent storage, not lost or the database corrupted.</p>
+<p>Jena provides transaction on datasets and provides "serializable transactions".
+Any application code reading data sees all changes made elsewhere,
+not parts of changes. In particular, SPARQL aggregation like <code>COUNT</code> are
+correct and do no tsee partial changes due to other transactions.</p>
+<p>The exact details are dependent on the implementation.</p>
+<p>Transactions can not be <a href="https://en.wikipedia.org/wiki/Nested_transaction">nested</a>
+(a tranaction happening inside an outertransaction results in chnages visble only
+to the outer transaction until that commits).</p>
+<p>Transactions are "per thread". Actions by different threads on the same dataset are
+always inside different transactions.</p>
+<h2 id="implementations">Implementations<a class="headerlink" href="#implementations" title="Permanent link">¶</a></h2>
+<p>Transactions are part of the interface to RDF Datasets.
+There is a default implementation, based on MRSW locking (multiple-reader or single-writer)
+that can be used with any mixed set of components. Certain storage sub-systems provide
+better concurrency with MR+SW (multiple-read and single writer).</p>
+<table class="table">
+<thead>
+<tr>
+<th>Dataset</th>
+<th>Facilties</th>
+<th>Creation</th>
+</tr>
+</thead>
+<tbody>
+<tr>
+<td>TxnMem</td>
+<td>MR+SW</td>
+<td><code>DatasetFactory.createTxnMem</code></td>
+</tr>
+<tr>
+<td>TDB</td>
+<td>MR+SW, persistent</td>
+<td><code>TDBFactory.create</code></td>
+</tr>
+<tr>
+<td>General</td>
+<td>MRSW</td>
+<td><code>DatasetFactory.create</code></td>
+</tr>
+</tbody>
+</table>
+<p>The general dataset can have have any graphs added to it (e.g. inference graphs).</p>
+<p><a href="transactions_tdb.html">More details of transactions in TDB</a>.</p>
+ </div>
+</div>
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