qt-everywhere-src-5.15.1/qtbase/src/network/bearer/qsharednetworksession.cpp

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#include "qsharednetworksession_p.h"
#include "qbearerengine_p.h"
#include <QThreadStorage>

#ifndef QT_NO_BEARERMANAGEMENT

QT_BEGIN_NAMESPACE

QThreadStorage<QSharedNetworkSessionManager *> tls;

inline QSharedNetworkSessionManager* sharedNetworkSessionManager()
{
    QSharedNetworkSessionManager* rv = tls.localData();
    if (!rv) {
        rv = new QSharedNetworkSessionManager;
        tls.setLocalData(rv);
    }
    return rv;
}

struct DeleteLater {
    void operator()(QObject* obj) const
    {
        obj->deleteLater();
    }
};

template <typename Container>
static void maybe_prune_expired(Container &c)
{
    if (c.size() > 16) {
        for (auto it = c.cbegin(), end = c.cend(); it != end; /*erasing*/) {
            if (!it->second.lock())
                it = c.erase(it);
            else
                ++it;
        }
    }
}

QSharedPointer<QNetworkSession> QSharedNetworkSessionManager::getSession(const QNetworkConfiguration &config)
{
    QSharedNetworkSessionManager *m = sharedNetworkSessionManager();
    maybe_prune_expired(m->sessions);
    auto &entry = m->sessions[config];
    //if already have a session, return it
    if (auto p = entry.toStrongRef())
        return p;
    //otherwise make one
    QSharedPointer<QNetworkSession> session(new QNetworkSession(config), DeleteLater{});
    entry = session;
    return session;
}

void QSharedNetworkSessionManager::setSession(const QNetworkConfiguration &config, QSharedPointer<QNetworkSession> session)
{
    QSharedNetworkSessionManager *m = sharedNetworkSessionManager();
    m->sessions[config] = std::move(session);
}

QT_END_NAMESPACE

#endif // QT_NO_BEARERMANAGEMENT