C++ message_id::valid方法代码示例

optional<behavior&> behavior_stack::sync_handler(message_id expected_response) {
    if (expected_response.valid()) {
        auto e = m_elements.rend();
        auto i = find_if(m_elements.rbegin(), e, [=](element_type& val) {
            return val.second == expected_response;
        });
        if (i != e) return i->first;
    }
    return none;
}

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;
}

bool actor_pool::filter(upgrade_lock<detail::shared_spinlock>& guard,
                        const actor_addr& sender, message_id mid,
                        const message& msg, execution_unit* eu) {
  auto rsn = planned_reason_;
  if (rsn != caf::exit_reason::not_exited) {
    guard.unlock();
    if (mid.valid()) {
      detail::sync_request_bouncer srq{rsn};
      srq(sender, mid);
    }
    return true;
  }
  if (msg.match_elements<exit_msg>()) {
    std::vector<actor> workers;
    // 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);
    planned_reason_ = msg.get_as<exit_msg>(0).reason;
    unique_guard.unlock();
    for (auto& w : workers) {
      anon_send(w, msg);
    }
    quit();
    return true;
  }
  if (msg.match_elements<down_msg>()) {
    // remove failed worker from pool
    auto& dm = msg.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);
    if (i != last) {
      workers_.erase(i);
    }
    if (workers_.empty()) {
      planned_reason_ = exit_reason::out_of_workers;
      unique_guard.unlock();
      quit();
    }
    return true;
  }
  if (msg.match_elements<sys_atom, put_atom, actor>()) {
    auto& worker = msg.get_as<actor>(2);
    if (worker == invalid_actor) {
      return true;
    }
    worker->attach(default_attachable::make_monitor(address()));
    upgrade_to_unique_lock<detail::shared_spinlock> unique_guard{guard};
    workers_.push_back(worker);
    return true;
  }
  if (msg.match_elements<sys_atom, delete_atom, actor>()) {
    upgrade_to_unique_lock<detail::shared_spinlock> unique_guard{guard};
    auto& what = msg.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 (msg.match_elements<sys_atom, get_atom>()) {
    auto cpy = workers_;
    guard.unlock();
    actor_cast<abstract_actor*>(sender)->enqueue(invalid_actor_addr,
                                                 mid.response_id(),
                                                 make_message(std::move(cpy)),
                                                 eu);
    return true;
  }
  if (workers_.empty()) {
    guard.unlock();
    if (sender != invalid_actor_addr && mid.valid()) {
      // tell client we have ignored this sync message by sending
      // and empty message back
      auto ptr = actor_cast<abstract_actor_ptr>(sender);
      ptr->enqueue(invalid_actor_addr, mid.response_id(), message{}, eu);
    }
    return true;
  }
  return false;
}

response_promise::response_promise(const actor_addr& from,
                                   const actor_addr& to,
                                   const message_id& id)
: m_from(from), m_to(to), m_id(id) {
    CPPA_REQUIRE(id.is_response() || !id.valid());
}

 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");
 }