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<h1><a class="anchor" id="async_model">Asynchronous Object Model </a></h1><h2><a class="anchor" id="async_model_overview">
Overview</a></h2>
<p>Telepathy-Qt4 uses <a href="http://dbus.freedesktop.org">D-Bus</a> to communicate with applications implementing the <a href="http://telepathy.freedesktop.org/spec.html">Telepathy specification</a>.</p>
<p>When dealing with D-Bus, method calls can take some time to return, and in this case is not desirable to make synchronous calls, which could turn into applications hanging waiting for method returns.</p>
<p>Telepathy-Qt4 introduces a new model in which objects needs to become ready before usage. This model became necessary as we needed a completelly asynchronous API for D-Bus proxy objects.</p>
<p>In order to do this new classes so called PendingOperations were created, and all methods that need to be asynchronous will return a <a class="el" href="classTp_1_1PendingOperation.html">Tp::PendingOperation</a> which will emit a signal <a class="el" href="classTp_1_1PendingOperation.html#addbb8c4462019ffdf19095a31da0cc7a">Tp::PendingOperation::finished()</a> when the operation has ended. See PendingOperation documentation for more details.</p>
<p>So when instantiating a new object (<a class="el" href="classTp_1_1Account.html">Tp::Account</a>, <a class="el" href="classTp_1_1AccountManager.html">Tp::AccountManager</a>, <a class="el" href="classTp_1_1Connection.html">Tp::Connection</a>, and so on), one needs to call <a class="el" href="classTp_1_1ReadyObject.html#ac02393f99a46725a4ffee32caaec13cc">Tp::ReadyObject::becomeReady()</a> and wait the returned PendingOperation to finish before using the object.</p>
<p>This assures that the initial object introspection process is completed and the object is ready to use.</p>
<p>Many objects cache the returned values of a previous introspection run for future access, allowing some methods to be synchronous. See the individual methods descriptions for more details. </p>
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<td width="30%">Copyright © 2008-2010 Collabora Ltd. and Nokia Corporation</td>
<td width="30%" align="right"><div align="right">Telepathy-Qt4 0.3.6</div></td>
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