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<div class="sect1">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="introduction-ideas-status"></a>Status Values</h2></div></div></div>
<p>
A transaction will have different status values as it it queued, prepared
and executed.
The <code class="literal">::StatusChanged</code> signal from PkClient allow you
to design user interfaces that tell the user what is happening with the
transaction.
</p>
<p>
A typical transaction will have the following states:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem"><p>
Queued in the active queue (<code class="literal">PK_STATUS_ENUM_WAIT</code>)
</p></li>
<li class="listitem"><p>
Transaction started, and is being prepared (<code class="literal">PK_STATUS_ENUM_SETUP</code>)
</p></li>
<li class="listitem"><p>
The transaction is running (<code class="literal">PK_STATUS_ENUM_RUNNING</code>)
</p></li>
<li class="listitem"><p>
(optional) Data is downloading (<code class="literal">PK_STATUS_ENUM_DOWNLOADING</code>)
</p></li>
<li class="listitem"><p>
(optional) Data is installing (<code class="literal">PK_STATUS_ENUM_INSTALLING</code>)
</p></li>
<li class="listitem"><p>
The transaction is finished (<code class="literal">PK_STATUS_ENUM_FINISHED</code>)
</p></li>
</ul></div>
<p>
If the transaction is waiting for other jobs to finish (in the active queue)
then the status will be stuck at <code class="literal">PK_STATUS_ENUM_WAIT</code>
and the UI should show a message to this effect.
</p>
<p>
If the transaction is waiting for a package lock (when a legacy tool like
<code class="literal">pirut</code> is loaded and has the <code class="literal">yum</code> lock)
then the transaction will be stuck at <code class="literal">PK_STATUS_ENUM_WAITING_FOR_LOCK</code>.
</p>
<p>
As a backend writer, you do not have to set <code class="literal">PK_STATUS_ENUM_RUNNING</code>
manually, as this will be set for you if you set any other value such as
<code class="literal">PK_STATUS_ENUM_DOWNLOADING</code> or <code class="literal">PK_STATUS_ENUM_INFO</code>.
However, you will need to avoid setting any status values until a package
lock is available and the transaction has started.
</p>
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