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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/122183/">https://git.reviewboard.kde.org/r/122183/</a>
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<p style="margin-top: 0;">On January 22nd, 2015, 12:45 p.m. UTC, <b>David Faure</b> wrote:</p>
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<a href="https://git.reviewboard.kde.org/r/122183/diff/1/?file=343932#file343932line672" style="color: black; font-weight: bold; text-decoration: underline;">src/currency.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; ">Value CurrencyCategoryPrivate::convert(const Value &value, const Unit &to)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">672</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">loop</span><span class="p">.</span><span class="n">exec</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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Ouch.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Hello unexpected reentrancy.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">If this code is async, it should provide a Job API instead of masquerading under a sync API with a nasty nested event loop.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Or is this running in a separate thread?</p></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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">It isn't running in a separate thread.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Hmm. This is strange. The previous code is as follows -
QNetworkReply *reply = manager.get(QNetworkRequest(QUrl(URL)));
QFile cacheFile(m_cache);
cacheFile.open(QFile::WriteOnly);
while (!reply->error() && !reply->atEnd()) {
if (reply->bytesAvailable()>0 || reply->waitForReadyRead(500)) {
cacheFile.write(reply->readAll());
}
}</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">QNetworkReply::waitForReadyRead is not implemented, so it uses QIODeivce::waitForReadyRead which just returns false. So this code basicallly keeps looping until we get a reply.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Possible ways to fix this -
1. Event Loop but only process some events
2. A loop as before
3. Async code where we fetch the currency rates in the background and for this result we convert it with the previous rates.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">I think (3) would be the best option. Opinions?</p></pre>
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<p>- Vishesh</p>
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<p>On January 21st, 2015, 2:47 p.m. UTC, Vishesh Handa wrote:</p>
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<div>Review request for KDE Frameworks.</div>
<div>By Vishesh Handa.</div>
<p style="color: grey;"><i>Updated Jan. 21, 2015, 2:47 p.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://bugs.kde.org/show_bug.cgi?id=340819">340819</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
kunitconversion
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<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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Currency: Fetch the currency file properly</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Properly run an event loop and wait for the file to be fetched.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Also add a test to make sure currency conversion is working.</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This patch also contains -
<em style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: normal;"> https://git.reviewboard.kde.org/r/122182/
</em> https://git.reviewboard.kde.org/r/122181/
* https://git.reviewboard.kde.org/r/122180/</p>
<p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">This is because reviewboard refuses to upload only a part of the diff. Please only look at currency.cpp w.r.t the EventLoop.</p></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;"><p style="padding: 0;text-rendering: inherit;margin: 0;line-height: inherit;white-space: inherit;">Test now passes.</p></pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>autotests/convertertest.h <span style="color: grey">(8129a48)</span></li>
<li>autotests/convertertest.cpp <span style="color: grey">(ae4298e)</span></li>
<li>src/currency.cpp <span style="color: grey">(715233c)</span></li>
<li>src/unit.cpp <span style="color: grey">(013b5d7)</span></li>
<li>src/unitcategory.cpp <span style="color: grey">(c34217e)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/122183/diff/" style="margin-left: 3em;">View Diff</a></p>
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