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QbsProjectManager: Fix handling of overlapping parse requests.

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The current code simply asserts when a new parse request comes in while
parsing. However, that condition is easily triggered, for instance if a
project file is saved to disk during a parse operation. Such updates
currently have no effect at all (other than triggering an error
message).
Instead, we now cancel the old parse job and start a new one.

Change-Id: If2eeb93b85b5163dcea99785a0fc89a254d082db
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
This commit is contained in:
Christian Kandeler
2014-07-14 10:22:37 +02:00
parent 051bccf89e
commit 20bfe889e9
4 changed files with 37 additions and 2 deletions
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27
src/plugins/qbsprojectmanager/qbsproject.cpp
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@@ -102,6 +102,7 @@ QbsProject::QbsProject(QbsManager *manager, const QString &fileName) :
m_qbsUpdateFutureInterface(0),
m_forceParsing(false),
m_parsingScheduled(false),
m_cancelingParsing(false),
m_currentBc(0)
{
m_parsingDelay.setInterval(1000); // delay parsing by 1s.
@@ -275,12 +276,23 @@ void QbsProject::handleQbsParsingDone(bool success)
{
QTC_ASSERT(m_qbsProjectParser, return);
// If this parse operation was canceled, start a new one right away, ignoring the old result.
if (m_cancelingParsing) {
m_cancelingParsing = false;
m_qbsProjectParser->deleteLater();
m_qbsProjectParser = 0;
parseCurrentBuildConfiguration(m_forceParsing);
return;
}
generateErrors(m_qbsProjectParser->error());
if (success) {
m_qbsProject = m_qbsProjectParser->qbsProject();
QTC_CHECK(m_qbsProject.isValid());
readQbsData();
} else {
m_qbsUpdateFutureInterface->reportCanceled();
}
m_qbsProjectParser->deleteLater();
@@ -369,12 +381,27 @@ void QbsProject::parseCurrentBuildConfiguration(bool force)
m_parsingScheduled = false;
if (!m_forceParsing)
m_forceParsing = force;
if (m_cancelingParsing)
return;
if (!activeTarget())
return;
QbsBuildConfiguration *bc = qobject_cast<QbsBuildConfiguration *>(activeTarget()->activeBuildConfiguration());
if (!bc)
return;
// New parse requests override old ones.
// NOTE: We need to wait for the current operation to finish, since otherwise there could
// be a conflict. Consider the case where the old qbs::ProjectSetupJob is writing
// to the build graph file when the cancel request comes in. If we don't wait for
// acknowledgment, it might still be doing that when the new one already reads from the
// same file.
if (m_qbsProjectParser) {
m_cancelingParsing = true;
m_qbsProjectParser->cancel();
return;
}
parse(bc->qbsConfiguration(), bc->environment(), bc->buildDirectory().toString());
}