void blocking_actor::dequeue(behavior& bhvr, message_id mid) {
CAF_LOG_TRACE(CAF_MARG(mid, integer_value));
// try to dequeue from cache first
if (invoke_from_cache(bhvr, mid)) {
return;
}
// requesting an invalid timeout will reset our active timeout
uint32_t timeout_id = 0;
if (mid == invalid_message_id) {
timeout_id = request_timeout(bhvr.timeout());
} else {
request_sync_timeout_msg(bhvr.timeout(), mid);
}
// read incoming messages
for (;;) {
await_data();
auto msg = next_message();
switch (invoke_message(msg, bhvr, mid)) {
case im_success:
if (mid == invalid_message_id) {
reset_timeout(timeout_id);
}
return;
case im_skipped:
if (msg) {
push_to_cache(std::move(msg));
}
break;
default:
// delete msg
break;
}
}
}
void remote_actor_proxy::forward_msg(const actor_addr& sender, message_id mid,
message msg) {
CAF_LOG_TRACE(CAF_ARG(id()) << ", " << CAF_TSARG(sender) << ", "
<< CAF_MARG(mid, integer_value) << ", "
<< CAF_TSARG(msg));
m_parent->enqueue(
invalid_actor_addr, invalid_message_id,
make_message(atom("_Dispatch"), sender, address(), mid, std::move(msg)),
nullptr);
}
void forwarding_actor_proxy::forward_msg(const actor_addr& sender,
message_id mid, message msg) {
CAF_LOG_TRACE(CAF_ARG(id()) << ", " << CAF_TSARG(sender) << ", "
<< CAF_MARG(mid, integer_value) << ", "
<< CAF_TSARG(msg));
shared_lock<detail::shared_spinlock> m_guard(m_manager_mtx);
m_manager->enqueue(invalid_actor_addr, invalid_message_id,
make_message(atom("_Dispatch"), sender,
address(), mid, std::move(msg)),
nullptr);
}
handle_message_result handle_message(Actor* self, mailbox_element* node,
Fun& fun, message_id awaited_response) {
bool handle_sync_failure_on_mismatch = true;
if (dptr()->hm_should_skip(node)) {
return hm_skip_msg;
}
switch (this->filter_msg(self, node)) {
case msg_type::normal_exit:
CAF_LOG_DEBUG("dropped normal exit signal");
return hm_drop_msg;
case msg_type::expired_sync_response:
CAF_LOG_DEBUG("dropped expired sync response");
return hm_drop_msg;
case msg_type::expired_timeout:
CAF_LOG_DEBUG("dropped expired timeout message");
return hm_drop_msg;
case msg_type::inactive_timeout:
CAF_LOG_DEBUG("skipped inactive timeout message");
return hm_skip_msg;
case msg_type::non_normal_exit:
CAF_LOG_DEBUG("handled non-normal exit signal");
// this message was handled
// by calling self->quit(...)
return hm_msg_handled;
case msg_type::timeout: {
CAF_LOG_DEBUG("handle timeout message");
auto& tm = node->msg.get_as<timeout_msg>(0);
self->handle_timeout(fun, tm.timeout_id);
if (awaited_response.valid()) {
self->mark_arrived(awaited_response);
self->remove_handler(awaited_response);
}
return hm_msg_handled;
}
case msg_type::timeout_response:
handle_sync_failure_on_mismatch = false;
CAF_ANNOTATE_FALLTHROUGH;
case msg_type::sync_response:
CAF_LOG_DEBUG("handle as synchronous response: "
<< CAF_TARG(node->msg, to_string) << ", "
<< CAF_MARG(node->mid, integer_value) << ", "
<< CAF_MARG(awaited_response, integer_value));
if (awaited_response.valid() && node->mid == awaited_response) {
auto previous_node = dptr()->hm_begin(self, node);
auto res = invoke_fun(self, node->msg, node->mid, fun);
if (!res && handle_sync_failure_on_mismatch) {
CAF_LOG_WARNING("sync failure occured in actor "
<< "with ID " << self->id());
self->handle_sync_failure();
}
self->mark_arrived(awaited_response);
self->remove_handler(awaited_response);
dptr()->hm_cleanup(self, previous_node);
return hm_msg_handled;
}
return hm_cache_msg;
case msg_type::ordinary:
if (!awaited_response.valid()) {
auto previous_node = dptr()->hm_begin(self, node);
auto res = invoke_fun(self, node->msg, node->mid, fun);
if (res) {
dptr()->hm_cleanup(self, previous_node);
return hm_msg_handled;
}
// no match (restore self members)
dptr()->hm_revert(self, previous_node);
}
CAF_LOG_DEBUG_IF(awaited_response.valid(),
"ignored message; await response: "
<< awaited_response.integer_value());
return hm_cache_msg;
}
// should be unreachable
CAF_CRITICAL("invalid message type");
}
optional<message> invoke_fun(Actor* self, message& msg, message_id& mid,
Fun& fun,
MaybeResponseHdl hdl = MaybeResponseHdl{}) {
# ifdef CAF_LOG_LEVEL
auto msg_str = to_string(msg);
# endif
CAF_LOG_TRACE(CAF_MARG(mid, integer_value) << ", msg = " << msg_str);
auto res = fun(msg); // might change mid
CAF_LOG_DEBUG_IF(res, "actor did consume message: " << msg_str);
CAF_LOG_DEBUG_IF(!res, "actor did ignore message: " << msg_str);
if (!res) {
return none;
}
if (res->empty()) {
// make sure synchronous requests
// always receive a response
if (mid.is_request() && !mid.is_answered()) {
CAF_LOG_WARNING("actor with ID " << self->id()
<< " did not reply to a synchronous request message");
auto fhdl = fetch_response_promise(self, hdl);
if (fhdl) {
fhdl.deliver(make_message(unit));
}
}
} else {
CAF_LOGF_DEBUG("res = " << to_string(*res));
if (res->template has_types<atom_value, uint64_t>()
&& res->template get_as<atom_value>(0) == atom("MESSAGE_ID")) {
CAF_LOG_DEBUG("message handler returned a message id wrapper");
auto id = res->template get_as<uint64_t>(1);
auto msg_id = message_id::from_integer_value(id);
auto ref_opt = self->sync_handler(msg_id);
// calls self->response_promise() if hdl is a dummy
// argument, forwards hdl otherwise to reply to the
// original request message
auto fhdl = fetch_response_promise(self, hdl);
if (ref_opt) {
behavior cpy = *ref_opt;
*ref_opt =
cpy.add_continuation([=](message & intermediate)
->optional<message> {
if (!intermediate.empty()) {
// do no use lamba expresion type to
// avoid recursive template instantiaton
behavior::continuation_fun f2 = [=](
message & m)->optional<message> {
return std::move(m);
};
auto mutable_mid = mid;
// recursively call invoke_fun on the
// result to correctly handle stuff like
// sync_send(...).then(...).then(...)...
return this->invoke_fun(self, intermediate,
mutable_mid, f2, fhdl);
}
return none;
});
}
// reset res to prevent "outer" invoke_fun
// from handling the result again
res->reset();
} else {
// respond by using the result of 'fun'
CAF_LOG_DEBUG("respond via response_promise");
auto fhdl = fetch_response_promise(self, hdl);
if (fhdl) {
fhdl.deliver(std::move(*res));
// inform caller about success
return message{};
}
}
}
return res;
}
