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KDE 4.7 PyKDE API Reference
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<h1>TransactionSequence Class Reference</h1>
<code>from PyKDE4.akonadi import *</code>
<p>
Inherits: <a href="../akonadi/Akonadi.Job.html">Akonadi.Job</a> → <a href="../kdecore/KCompositeJob.html">KCompositeJob</a> → <a href="../kdecore/KJob.html">KJob</a> → QObject<br />
Namespace: <a href="../akonadi/Akonadi.html">Akonadi</a><br />
<h2>Detailed Description</h2>
<p>Base class for jobs that need to run a sequence of sub-jobs in a transaction.
</p>
<p>
As soon as the first subjob is added, the transaction is started.
As soon as the last subjob has successfully finished, the transaction is committed.
If any subjob fails, the transaction is rolled back.
</p>
<p>
Alternatively, a TransactionSequence object can be used as a parent object
for a set of jobs to achieve the same behaviour without subclassing.
</p>
<p>
Example:
</p>
<p>
<pre class="fragment">
// Delete a couple of items inside a transaction
Akonadi.TransactionSequence *transaction = new Akonadi.TransactionSequence;
connect( transaction, SIGNAL( result( KJob* ) ), SLOT( transactionFinished( KJob* ) ) );
const Akonadi.Item.List items = ...
foreach ( const Akonadi.Item &item, items ) {
new Akonadi.ItemDeleteJob( item, transaction );
}
...
MyClass.transactionFinished( KJob *job )
{
if ( job->error() )
qDebug() << "Error occurred";
else
qDebug() << "Items deleted successfully";
}
</pre>
</p>
<p>
<dl class="author" compact><dt><b>Author:</b></dt><dd> Volker Krause <vkrause@kde.org> </dd></dl>
</p>
<table border="0" cellpadding="0" cellspacing="0"><tr><td colspan="2"><br><h2>Methods</h2></td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#TransactionSequence">__init__</a> (self, QObject parent=0)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top">bool </td><td class="memItemRight" valign="bottom"><a class="el" href="#addSubjob">addSubjob</a> (self, <a href="../kdecore/KJob.html">KJob</a> job)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#commit">commit</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#doStart">doStart</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#rollback">rollback</a> (self)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setAutomaticCommittingEnabled">setAutomaticCommittingEnabled</a> (self, bool enable)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#setIgnoreJobFailure">setIgnoreJobFailure</a> (self, <a href="../kdecore/KJob.html">KJob</a> job)</td></tr>
<tr><td class="memItemLeft" nowrap align="right" valign="top"> </td><td class="memItemRight" valign="bottom"><a class="el" href="#slotResult">slotResult</a> (self, <a href="../kdecore/KJob.html">KJob</a> job)</td></tr>
</table>
<hr><h2>Method Documentation</h2><a class="anchor" name="TransactionSequence"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">__init__</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">QObject </td>
<td class="paramname"><em>parent=0</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Creates a new transaction sequence.
</p>
<p>
</p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>parent</em> </td><td> The parent object.
</td></tr>
</table></dl>
<p>
</p></div></div><a class="anchor" name="addSubjob"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname">bool addSubjob</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../kdecore/KJob.html">KJob</a> </td>
<td class="paramname"><em>job</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="commit"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> commit</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Commits the transaction as soon as all pending sub-jobs finished successfully.
</p></div></div><a class="anchor" name="doStart"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> doStart</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"></div></div><a class="anchor" name="rollback"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> rollback</td>
<td>(</td>
<td class="paramtype"> </td>
<td class="paramname"><em>self</em> )</td>
<td width="100%"> </td>
</tr>
</table>
</div>
<div class="memdoc"><p>Rolls back the current transaction as soon as possible.
You only need to call this method when you want to roll back due to external
reasons (e.g. user cancellation), the transaction is automatically rolled back
if one of its subjobs fails.
<dl class="since" compact><dt><b>Since:</b></dt><dd> 4.5
</dd></dl>
</p></div></div><a class="anchor" name="setAutomaticCommittingEnabled"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setAutomaticCommittingEnabled</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype">bool </td>
<td class="paramname"><em>enable</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Disable automatic committing.
Use this when you want to add jobs to this sequence after execution
has been started, usually that is outside of the constructor or the
method that creates this transaction sequence.
<dl class="note" compact><dt><b>Note:</b></dt><dd> Calling this method after execution of this job has been started
has no effect.
</dd></dl> </p><dl compact><dt><b>Parameters:</b></dt><dd>
<table border="0" cellspacing="2" cellpadding="0">
<tr><td></td><td valign="top"><em>enable</em> </td><td> true to enable autocommitting (default), false to disable it
</td></tr> </table></dl>
<p> <dl class="since" compact><dt><b>Since:</b></dt><dd> 4.5
</dd></dl>
</p></div></div><a class="anchor" name="setIgnoreJobFailure"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> setIgnoreJobFailure</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../kdecore/KJob.html">KJob</a> </td>
<td class="paramname"><em>job</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
<div class="memdoc"><p>Sets which job of the sequence might fail without rolling back the
complete transaction.
</p>
<p>
<dl class="since" compact><dt><b>Since:</b></dt><dd> 4.5
</dd></dl>
</p></div></div><a class="anchor" name="slotResult"></a>
<div class="memitem">
<div class="memproto">
<table class="memname"><tr>
<td class="memname"> slotResult</td>
<td>(</td>
<td class="paramtype"> <em>self</em>, </td>
<td class="paramname"></td>
</tr><tr>
<td class="memname"></td>
<td></td>
<td class="paramtype"><a href="../kdecore/KJob.html">KJob</a> </td>
<td class="paramname"><em>job</em></td>
</tr>
<tr>
<td></td>
<td>)</td>
<td></td>
<td></td>
<td width="100%"> </td>
</tr></table>
</div>
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