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| <h1 class="title">Jena Transactions</h1> |
| |
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| <main class="d-flex flex-xl-row flex-column"> |
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| <ul> |
| <li><a href="#apis">APIs</a></li> |
| <li><a href="#overview">Overview</a></li> |
| <li><a href="#implementations">Implementations</a></li> |
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| <article class="flex-column me-lg-4"> |
| <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</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</h2> |
| <p>Transaction provide applications with a safe way to use and update data between |
| threads. The properties of transactions are <a href="https://en.wikipedia.org/wiki/ACID">ACID</a></p> |
| <ul> |
| <li>Atomic, Consistent, Isolation, Durable - |
| meaning that groups of changes are made visible to other transactions |
| in a single unit or no changes become visible, and when made changes are not |
| reversed, or the case of persistent storage, not lost or the database corrupted.</li> |
| </ul> |
| <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 not see 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 transaction happening inside an outer transaction results in changes visible 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</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> |
| <thead> |
| <tr> |
| <th>Dataset</th> |
| <th>Facilities</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>TDB2</td> |
| <td>MR+SW, persistent</td> |
| <td><code>TDB2Factory.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 any graphs added to it (e.g. inference graphs).</p> |
| <p><a href="transactions_tdb.html">More details of transactions in TDB</a>.</p> |
| |
| </article> |
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