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Allow QHostInfo::lookupHost() with no receiver to warm the DNS cache.

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This change lets you call QHostInfo::lookupHost() with a null receiver
in order to warm up the DNS cache. This allows you to try to get the
DNS request in flight early.

Change-Id: Icfdd28146479aa534ae9ceb472f75e08aaa39cd2
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Richard Moore 2013-02-04 22:28:59 +00:00 committed by The Qt Project
parent b92d951bb1
commit 4030b6339c
1 changed files with 8 additions and 1 deletions
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9
src/network/kernel/qhostinfo.cpp
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@ -164,6 +164,9 @@ int QHostInfo::lookupHost(const QString &name, QObject *receiver,
int id = theIdCounter.fetchAndAddRelaxed(1); // generate unique ID
if (name.isEmpty()) {
if (!receiver)
return -1;
QHostInfo hostInfo(id);
hostInfo.setError(QHostInfo::HostNotFound);
hostInfo.setErrorString(QCoreApplication::translate("QHostInfo", "No host name given"));
@ -183,6 +186,9 @@ int QHostInfo::lookupHost(const QString &name, QObject *receiver,
bool valid = false;
QHostInfo info = manager->cache.get(name, &valid);
if (valid) {
if (!receiver)
return -1;
info.setLookupId(id);
QHostInfoResult result;
QObject::connect(&result, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
@ -193,7 +199,8 @@ int QHostInfo::lookupHost(const QString &name, QObject *receiver,
// cache is not enabled or it was not in the cache, do normal lookup
QHostInfoRunnable* runnable = new QHostInfoRunnable(name, id);
QObject::connect(&runnable->resultEmitter, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
if (receiver)
QObject::connect(&runnable->resultEmitter, SIGNAL(resultsReady(QHostInfo)), receiver, member, Qt::QueuedConnection);
manager->scheduleLookup(runnable);
}
return id;