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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/105813/">http://git.reviewboard.kde.org/r/105813/</a>
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<p style="margin-top: 0;">On August 1st, 2012, 12:51 p.m., <b>George Kiagiadakis</b> wrote:</p>
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<a href="http://git.reviewboard.kde.org/r/105813/diff/1/?file=75589#file75589line80" style="color: black; font-weight: bold; text-decoration: underline;">telepathy-mpris.cpp</a>
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(Diff revision 1)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">void TelepathyMPRIS::onPlayerSignalReceived(const QString &interface, const QVariantMap &changedProperties, const QStringList &invalidatedProperties)</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="c1">//FIXME We can do less lame parsing...maybe.</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="c1">//FIXME We can do less lame parsing...maybe.</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">Q_FOREACH</span> <span class="p">(</span><span class="k">const</span> <span class="n">QVariant</span> <span class="o">&</span><span class="n">property</span><span class="p">,</span> <span class="n">changedProperties</span><span class="p">.</span><span class="n">values</span><span class="p">())</span> <span class="p">{</span> <span class="c1">//krazy:exclude=foreach</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">Q_FOREACH</span> <span class="p">(</span><span class="k">const</span> <span class="n">QVariant</span> <span class="o">&</span><span class="n">property</span><span class="p">,</span> <span class="n">changedProperties</span><span class="p">.</span><span class="n">values</span><span class="p">())</span> <span class="p">{</span> <span class="c1">//krazy:exclude=foreach</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">property</span><span class="p">.</span><span class="n">canConvert</span><span class="o"><</span><span class="n">QString</span><span class="o">></span><span class="p">())</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">property</span><span class="p">.</span><span class="n">canConvert</span><span class="o"><</span><span class="n">QString</span><span class="o">></span><span class="p">())</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">property</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span> <span class="o">==</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"Paused"</span><span class="p">)</span> <span class="o">||</span> <span class="n">property</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span> <span class="o">==</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"Stopped"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">property</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span> <span class="o">==</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"Paused"</span><span class="p">)</span> <span class="o">||</span> <span class="n">property</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span> <span class="o">==</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"Stopped"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">setActive</span><span class="p">(</span><span class="kc">false</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">setActive</span><span class="p">(</span><span class="kc">false</span><span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span><span class="p">;</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">property</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span> <span class="o">==</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"Playing"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">property</span><span class="p">.</span><span class="n">toString</span><span class="p">()</span> <span class="o">==</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"Playing"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QStringList</span> <span class="n">mprisServices</span> <span class="o">=</span> <span class="n">QDBusConnection</span><span class="o">::</span><span class="n">sessionBus</span><span class="p">().</span><span class="n">interface</span><span class="p">()</span><span class="o">-></span><span class="n">registeredServiceNames</span><span class="p">().</span><span class="n">value</span><span class="p">().</span><span class="n">filter</span><span class="p">(</span><span class="n">QLatin1String</span><span class="p">(</span><span class="s">"org.mpris.MediaPlayer2"</span><span class="p">));</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QStringList</span> <span class="n">mprisServices</span> <span class="o">=</span> <span class="n">QDBusConnection</span><span class="o">::</span><span class="n">sessionBus</span><span class="p">().</span><span class="n">interface</span><span class="p">()</span><span class="o">-></span><span class="n">registeredServiceNames</span><span class="p">().</span><span class="n">value</span><span class="p">().</span><span class="n">filter</span><span class="p">(</span><span class="n">QLatin1String</span><span class="p">(</span><span class="s">"org.mpris.MediaPlayer2"</span><span class="p">));</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">Q_FOREACH</span> <span class="p">(</span><span class="k">const</span> <span class="n">QString</span> <span class="o">&</span><span class="n">service</span><span class="p">,</span> <span class="n">mprisServices</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">Q_FOREACH</span> <span class="p">(</span><span class="k">const</span> <span class="n">QString</span> <span class="o">&</span><span class="n">service</span><span class="p">,</span> <span class="n">mprisServices</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QDBusInterface</span> <span class="n">mprisInterface</span><span class="p">(</span><span class="n">service</span><span class="p">,</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"/org/mpris/MediaPlayer2"</span><span class="p">),</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"org.mpris.MediaPlayer2.Player"</span><span class="p">));</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="c1">//get player properties, including song metadata</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">mprisInterface</span><span class="p">.</span><span class="n">property</span><span class="p">(</span><span class="s">"PlaybackStatus"</span><span class="p">)</span> <span class="o">==</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"Playing"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QDBusInterface</span> <span class="n">mprisInterface</span><span class="p">(</span><span class="n">service</span><span class="p">,</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"/org/mpris/MediaPlayer2"</span><span class="p">),</span> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"org.freedesktop.DBus.Properties"</span><span class="p">));</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QMap</span><span class="o"><</span><span class="n">QString</span><span class="p">,</span> <span class="n">QVariant</span><span class="o">></span> <span class="n">metadata</span> <span class="o">=</span> <span class="n">mprisInterface</span><span class="p">.</span><span class="n">property</span><span class="p">(</span><span class="s">"Metadata"</span><span class="p">).</span><span class="n">toMap</span><span class="p">();</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QDBusPendingCall</span> <span class="n">call</span> <span class="o">=</span> <span class="n">mprisInterface</span><span class="p">.</span><span class="n">asyncCall</span><span class="p">(</span><span class="n">QLatin1String</span><span class="p">(</span><span class="s">"GetAll"</span><span class="p">),</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">metadata</span><span class="p">.</span><span class="n">isEmpty</span><span class="p">())</span> <span class="p">{</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QLatin1String</span><span class="p">(</span><span class="s">"org.mpris.MediaPlayer2.Player"</span><span class="p">));</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</span><span class="p">;</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QDBusPendingCallWatcher</span> <span class="o">*</span><span class="n">watcher</span> <span class="o">=</span> <span class="k">new</span> <span class="n">QDBusPendingCallWatcher</span><span class="p">(</span><span class="n">call</span><span class="p">,</span> <span class="k">this</span><span class="p">);</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">connect</span><span class="p">(</span><span class="n">watcher</span><span class="p">,</span> <span class="n">SIGNAL</span><span class="p">(</span><span class="n">finished</span><span class="p">(</span><span class="n">QDBusPendingCallWatcher</span><span class="o">*</span><span class="p">)),</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">artist</span> <span class="o">=</span> <span class="n">metadata</span><span class="p">.</span><span class="n">value</span><span class="p">(</span><span class="n">QLatin1String</span><span class="p">(</span><span class="s">"xesam:artist"</span><span class="p">)).</span><span class="n">toString</span><span class="p">();</span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">this</span><span class="p">,</span> <span class="n">SLOT</span><span class="p">(</span><span class="n">onPlaybackStatusReceived</span><span class="p">(</span><span class="n">QDBusPendingCallWatcher</span><span class="o">*</span><span class="p">)));</span></pre></td>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This code could be improved a lot. First by just checking the "PlaybackStatus" property instead of all of them and second by caching properties for each player so that you don't have to fetch them all again for each player... I suspect it works, though, but it is a bit fragile imho.</pre>
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<p>On August 1st, 2012, 1:05 p.m., <b>Martin Klapetek</b> wrote:</p>
<blockquote style="margin-left: 1em; border-left: 2px solid #d0d0d0; padding-left: 10px;">
<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">> checking the "PlaybackStatus" property instead of all of them
True, but if the status is "Playing", we need to fetch the song metadata - do another dbus call and handle it. So I fetch it all at once, check for the playback status (again..) and if "Playing", the track data are available right away. That's why I did it like this. But I can change it to fetch only those properties really needed.
> caching properties for each player so that you don't have to fetch them all again for each player
Yeah that's a bit crap. We actually only need the PlaybackStatus and Metadata properties and caching these is no use.
--
I can rework this to check for PlaybackStatus in detectPlayers() and then fetch the track data only if the status is Playing. That way we will query all players for only one property and one more if it is playing. Then I can try changing the onPlayerSignalReceived(..) method to actually be aware which player emitted that signal and only query that one player for the song data.
Would that work?</pre>
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<pre style="margin-left: 1em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I was more referring to checking the "PlaybackStatus" property instead of doing a Q_FOREACH() going through all the properties and seeing which one has an acceptable value... I am not talking about GetAll here.
Also, about caching properties... the spec says that the PropertiesChanged signal is emitted for all properties, including the Metadata one. So, instead of asking the player for the property you could wait for the signal and cache the value - only for the Metadata property. This is how tp-qt gets property values 99% of the time.</pre>
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<p>- George</p>
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<p>On August 1st, 2012, 12:41 p.m., Martin Klapetek wrote:</p>
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<div>Review request for Telepathy.</div>
<div>By Martin Klapetek.</div>
<p style="color: grey;"><i>Updated Aug. 1, 2012, 12:41 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I reworked the kded module to use async dbus calls. Now when it detects a player, it queries for all its properties (to save some roundtrips) and if it finds the player is playing, it sets the song info as the presence.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Tested with clementine.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>telepathy-mpris.h <span style="color: grey">(de45cec)</span></li>
<li>telepathy-mpris.cpp <span style="color: grey">(8386dd9)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/105813/diff/" style="margin-left: 3em;">View Diff</a></p>
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