void sync_request_bouncer::operator()(const strong_actor_ptr& sender,
const message_id& mid) const {
if (sender && mid.is_request())
sender->enqueue(nullptr, mid.response_id(),
make_message(make_error(sec::request_receiver_down)),
// TODO: this breaks out of the execution unit
nullptr);
}
bool actor_pool::filter(upgrade_lock<detail::shared_spinlock>& guard,
const strong_actor_ptr& sender, message_id mid,
message_view& mv, execution_unit* eu) {
auto& content = mv.content();
CAF_LOG_TRACE(CAF_ARG(mid) << CAF_ARG(content));
if (content.match_elements<exit_msg>()) {
// acquire second mutex as well
std::vector<actor> workers;
auto em = content.get_as<exit_msg>(0).reason;
if (cleanup(std::move(em), eu)) {
auto tmp = mv.move_content_to_message();
// send exit messages *always* to all workers and clear vector afterwards
// but first swap workers_ out of the critical section
upgrade_to_unique_lock<detail::shared_spinlock> unique_guard{guard};
workers_.swap(workers);
unique_guard.unlock();
for (auto& w : workers)
anon_send(w, tmp);
unregister_from_system();
}
return true;
}
if (content.match_elements<down_msg>()) {
// remove failed worker from pool
auto& dm = content.get_as<down_msg>(0);
upgrade_to_unique_lock<detail::shared_spinlock> unique_guard{guard};
auto last = workers_.end();
auto i = std::find(workers_.begin(), workers_.end(), dm.source);
CAF_LOG_DEBUG_IF(i == last, "received down message for an unknown worker");
if (i != last)
workers_.erase(i);
if (workers_.empty()) {
planned_reason_ = exit_reason::out_of_workers;
unique_guard.unlock();
quit(eu);
}
return true;
}
if (content.match_elements<sys_atom, put_atom, actor>()) {
auto& worker = content.get_as<actor>(2);
worker->attach(default_attachable::make_monitor(worker.address(),
address()));
upgrade_to_unique_lock<detail::shared_spinlock> unique_guard{guard};
workers_.push_back(worker);
return true;
}
if (content.match_elements<sys_atom, delete_atom, actor>()) {
upgrade_to_unique_lock<detail::shared_spinlock> unique_guard{guard};
auto& what = content.get_as<actor>(2);
auto last = workers_.end();
auto i = std::find(workers_.begin(), last, what);
if (i != last) {
workers_.erase(i);
}
return true;
}
if (content.match_elements<sys_atom, get_atom>()) {
auto cpy = workers_;
guard.unlock();
sender->enqueue(nullptr, mid.response_id(),
make_message(std::move(cpy)), eu);
return true;
}
if (workers_.empty()) {
guard.unlock();
if (sender && mid.valid()) {
// tell client we have ignored this sync message by sending
// and empty message back
sender->enqueue(nullptr, mid.response_id(), message{}, eu);
}
return true;
}
return false;
}
void basp_broker_state::deliver(const node_id& src_nid, actor_id src_aid,
strong_actor_ptr dest, message_id mid,
std::vector<strong_actor_ptr>& stages,
message& msg) {
CAF_LOG_TRACE(CAF_ARG(src_nid) << CAF_ARG(src_aid) << CAF_ARG(dest)
<< CAF_ARG(msg) << CAF_ARG(mid));
auto src = src_nid == this_node() ? system().registry().get(src_aid)
: proxies().get_or_put(src_nid, src_aid);
// Intercept link messages. Forwarding actor proxies signalize linking
// by sending link_atom/unlink_atom message with src = dest.
if (msg.type_token() == make_type_token<atom_value, strong_actor_ptr>()) {
switch (static_cast<uint64_t>(msg.get_as<atom_value>(0))) {
default:
break;
case link_atom::value.uint_value(): {
if (src_nid != this_node()) {
CAF_LOG_WARNING("received link message for an other node");
return;
}
auto ptr = msg.get_as<strong_actor_ptr>(1);
if (!ptr) {
CAF_LOG_WARNING("received link message with invalid target");
return;
}
if (!src) {
CAF_LOG_DEBUG("received link for invalid actor, report error");
anon_send(actor_cast<actor>(ptr),
make_error(sec::remote_linking_failed));
return;
}
static_cast<actor_proxy*>(ptr->get())->local_link_to(src->get());
return;
}
case unlink_atom::value.uint_value(): {
if (src_nid != this_node()) {
CAF_LOG_WARNING("received unlink message for an other node");
return;
}
auto ptr = msg.get_as<strong_actor_ptr>(1);
if (!ptr) {
CAF_LOG_DEBUG("received unlink message with invalid target");
return;
}
if (!src) {
CAF_LOG_DEBUG("received unlink for invalid actor, report error");
return;
}
static_cast<actor_proxy*>(ptr->get())->local_unlink_from(src->get());
return;
}
}
}
if (!dest) {
auto rsn = exit_reason::remote_link_unreachable;
CAF_LOG_INFO("cannot deliver message, destination not found");
self->parent().notify<hook::invalid_message_received>(src_nid, src,
invalid_actor_id,
mid, msg);
if (mid.valid() && src) {
detail::sync_request_bouncer srb{rsn};
srb(src, mid);
}
return;
}
self->parent().notify<hook::message_received>(src_nid, src, dest, mid, msg);
dest->enqueue(make_mailbox_element(std::move(src), mid, std::move(stages),
std::move(msg)),
nullptr);
}