bool ConnectionContext::fetch(boost::shared_ptr<SessionContext> ssn, boost::shared_ptr<ReceiverContext> lnk, qpid::messaging::Message& message, qpid::messaging::Duration timeout)
{
{
qpid::sys::ScopedLock<qpid::sys::Monitor> l(lock);
if (!lnk->capacity) {
pn_link_flow(lnk->receiver, 1);
wakeupDriver();
}
}
if (get(ssn, lnk, message, timeout)) {
qpid::sys::ScopedLock<qpid::sys::Monitor> l(lock);
if (lnk->capacity) {
pn_link_flow(lnk->receiver, 1);//TODO: is this the right approach?
wakeupDriver();
}
return true;
} else {
{
qpid::sys::ScopedLock<qpid::sys::Monitor> l(lock);
pn_link_drain(lnk->receiver, 0);
wakeupDriver();
while (pn_link_credit(lnk->receiver) && !pn_link_queued(lnk->receiver)) {
QPID_LOG(debug, "Waiting for message or for credit to be drained: credit=" << pn_link_credit(lnk->receiver) << ", queued=" << pn_link_queued(lnk->receiver));
wait();
}
if (lnk->capacity && pn_link_queued(lnk->receiver) == 0) {
pn_link_flow(lnk->receiver, lnk->capacity);
}
}
if (get(ssn, lnk, message, qpid::messaging::Duration::IMMEDIATE)) {
qpid::sys::ScopedLock<qpid::sys::Monitor> l(lock);
if (lnk->capacity) {
pn_link_flow(lnk->receiver, 1);
wakeupDriver();
}
return true;
} else {
return false;
}
}
}
int link::queued() { return pn_link_queued(pn_object()); }
