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This is an automatically generated e-mail. To reply, visit:
<a href="https://git.reviewboard.kde.org/r/118686/">https://git.reviewboard.kde.org/r/118686/</a>
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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 review has been submitted with commit 8f4fc01384fa61618b0b18f97fc111ec3b3e7435 by Inge Wallin to branch master.</pre>
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<p>- Commit Hook</p>
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<p>On June 23rd, 2014, 6:19 a.m. UTC, Andreas Xavier wrote:</p>
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<div>Review request for KDE Edu.</div>
<div>By Andreas Xavier.</div>
<p style="color: grey;"><i>Updated June 23, 2014, 6:19 a.m.</i></p>
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<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="http://bugs.kde.org/show_bug.cgi?id=240552">240552</a>
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<b style="color: #575012; font-size: 10pt;">Repository: </b>
libkdeedu
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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;">Implement a lock on the language file.
The problem: When 2 or more instances of parley open that same language file,
the last instance to exit overwrites all of the previous changes.
This patch implements unit-tests that demonstrate the problem, and file locking
on the language file to fix the problem.
The unit tests are straight forward with different combinations of open, editing and saving
language files. The conditions that I anticipated would replicate the problem.
As a solution this patch uses KAutoSaveFile to implement file locking. m_autosave replaces m_url to track the file.
Second and subsequent instances of KEduVocDocument can't get a lock for the file. From a programmer perspective
it returns FileCannotWrite when file access fails. From a user perspective it says that it
can't read collection from <file name>.
I added KEduVocDocument::close() to the public interface for symmetry with open(). It is not necessary and if interface changes are inconvenient at this time, it can be removed. Destroying the KEduVocDocument, changing the Url with setUrl or saveAs, or opening another file all close the currently open file and eliminate the lock.
One foreseeable problem is that the current parley interface doesn't offer a way to remove the lock if parley crashes.
The vocabulary file would have to be renamed by hand. However, this is an improvement from data loss to data inaccessible.
The obvious solution is to add a value to the error enumeration that means the file is locked, and then offer the user to option to steal the lock. That would require changes to the KEduVocDocument interface. </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;">1. Unit tests
2. Opened 2 instances of parley and verified that only one could use the file and then after exiting
that the other could then use the file and then that both successive sets of results had been saved. </pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>keduvocdocument/keduvocdocument.h <span style="color: grey">(dfd45c3)</span></li>
<li>keduvocdocument/keduvocdocument.cpp <span style="color: grey">(b73fc69)</span></li>
<li>keduvocdocument/tests/CMakeLists.txt <span style="color: grey">(f05b787)</span></li>
<li>keduvocdocument/tests/keduvocdocumentfilelockingtest.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>keduvocdocument/tests/keduvocdocumentvalidatortest.cpp <span style="color: grey">(834564c)</span></li>
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<p><a href="https://git.reviewboard.kde.org/r/118686/diff/" style="margin-left: 3em;">View Diff</a></p>
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