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QNetworkReplyHttpImpl: convert some QDateTime::currentDateTime() to currentDateTimeUtc()

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The latter is much faster as it doesn't have to deal with
time zones.

This change is safe, because the QDateTime is only used to
compare against a copy of itself, adjusted by some seconds,
which doen't care which TZ the date-time is in, to get a
time_t, which is much faster done from a UTC time, and
to calculate the seconds to expirationTime, which, from a
quick glance around, seem to be mostly, if not exclusively,
in UTC. secsTo() works across time zones, but the comparison
between UTC date-times is fastest.

Credits to Milian Wolff, from whose QtWS15 talk this advice is
taken.

Change-Id: I22aa5350b29493f01fb503ef5ec68a964ca95cf3
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>
This commit is contained in:
Marc Mutz 2015-10-23 16:32:59 +02:00
parent 39e023b805
commit f8eeabcf5c
1 changed files with 2 additions and 2 deletions
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4
src/network/access/qnetworkreplyhttpimpl.cpp
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@ -512,7 +512,7 @@ bool QNetworkReplyHttpImplPrivate::loadFromCacheIfAllowed(QHttpNetworkRequest &h
return false;
}
QDateTime currentDateTime = QDateTime::currentDateTime();
QDateTime currentDateTime = QDateTime::currentDateTimeUtc();
QDateTime expirationDate = metaData.expirationDate();
bool response_is_fresh;
@ -545,7 +545,7 @@ bool QNetworkReplyHttpImplPrivate::loadFromCacheIfAllowed(QHttpNetworkRequest &h
date_value = dateHeader.toTime_t();
}
int now = currentDateTime.toUTC().toTime_t();
int now = currentDateTime.toTime_t();
int request_time = now;
int response_time = now;