// the QHostInfoLookupManager will at some point call this via a QThreadPool
void QHostInfoRunnable::run()
{
    QHostInfoLookupManager *manager = theHostInfoLookupManager();
    // check aborted
    if (manager->wasAborted(id)) {
        manager->lookupFinished(this);
        return;
    }

    // check cache
    // FIXME

    // if not in cache: OS lookup
    QHostInfo hostInfo = QHostInfoAgent::fromName(toBeLookedUp);

    // save to cache
    // FIXME

    // check aborted again
    if (manager->wasAborted(id)) {
        manager->lookupFinished(this);
        return;
    }

    // signal emission
    hostInfo.setLookupId(id);
    resultEmitter.emitResultsReady(hostInfo);

    manager->lookupFinished(this);

    // thread goes back to QThreadPool
}
Exemple #2
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// the QHostInfoLookupManager will at some point call this via a QThreadPool
void QHostInfoRunnable::run()
{
    QHostInfoLookupManager *manager = theHostInfoLookupManager();
    // check aborted
    if (manager->wasAborted(id)) {
        manager->lookupFinished(this);
        return;
    }

    QHostInfo hostInfo;

    // QHostInfo::lookupHost already checks the cache. However we need to check
    // it here too because it might have been cache saved by another QHostInfoRunnable
    // in the meanwhile while this QHostInfoRunnable was scheduled but not running
    if (manager->cache.isEnabled()) {
        // check the cache first
        bool valid = false;
        hostInfo = manager->cache.get(toBeLookedUp, &valid);
        if (!valid) {
            // not in cache, we need to do the lookup and store the result in the cache
            hostInfo = QHostInfoAgent::fromName(toBeLookedUp);
            manager->cache.put(toBeLookedUp, hostInfo);
        }
    } else {
        // cache is not enabled, just do the lookup and continue
        hostInfo = QHostInfoAgent::fromName(toBeLookedUp);
    }

    // check aborted again
    if (manager->wasAborted(id)) {
        manager->lookupFinished(this);
        return;
    }

    // signal emission
    hostInfo.setLookupId(id);
    resultEmitter.emitResultsReady(hostInfo);

    // now also iterate through the postponed ones
    {
        QMutexLocker locker(&manager->mutex);
        QMutableListIterator<QHostInfoRunnable*> iterator(manager->postponedLookups);
        while (iterator.hasNext()) {
            QHostInfoRunnable* postponed = iterator.next();
            if (toBeLookedUp == postponed->toBeLookedUp) {
                // we can now emit
                iterator.remove();
                hostInfo.setLookupId(postponed->id);
                postponed->resultEmitter.emitResultsReady(hostInfo);
                delete postponed;
            }
        }
    }

    manager->lookupFinished(this);

    // thread goes back to QThreadPool
}