C++ Datagram::add_server_header方法代码示例

		virtual void handle_datagram(Datagram &in_dg, DatagramIterator &dgi)
		{
			channel_t sender = dgi.read_uint64();
			unsigned short msg_type = dgi.read_uint16();
			switch(msg_type)
			{
				case DBSERVER_CREATE_STORED_OBJECT:
				{
					unsigned int context = dgi.read_uint32();

					// Start response with generic header
					Datagram resp;
					resp.add_server_header(sender, m_control_channel, DBSERVER_CREATE_STORED_OBJECT_RESP);
					resp.add_uint32(context);

					// Get DistributedClass
					unsigned short dc_id = dgi.read_uint16();
					DCClass *dcc = gDCF->get_class(dc_id);
					if(!dcc)
					{
						m_log->error() << "Invalid DCClass when creating object: #" << dc_id << std::endl;
						resp.add_uint32(0);
						send(resp);
						return;
					}

					// Unpack fields to be passed to database
					DatabaseObject dbo(dc_id);
					unsigned short field_count = dgi.read_uint16();
					m_log->spam() << "Unpacking fields..." << std::endl;
					try
					{
						for(unsigned int i = 0; i < field_count; ++i)
						{
							unsigned short field_id = dgi.read_uint16();
							DCField *field = dcc->get_field_by_index(field_id);
							if(field)
							{
								if(field->is_db())
								{
									dgi.unpack_field(field, dbo.fields[field]);
								}
								else
								{
									std::string tmp;
									dgi.unpack_field(field, tmp);
								}
							}
						}
					}
					catch(std::exception &e)
					{
						m_log->error() << "Error while unpacking fields, msg may be truncated. e.what(): "
							<< e.what() << std::endl;

						resp.add_uint32(0);
						send(resp);
						return;
					}

					// Check for required fields, and populate with defaults
					m_log->spam() << "Checking all required fields exist..." << std::endl;
					for(int i = 0; i < dcc->get_num_inherited_fields(); ++i)
					{
						DCField *field = dcc->get_inherited_field(i);
						if(field->is_required() && field->is_db() && !field->as_molecular_field())
						{
							if(dbo.fields.find(field) == dbo.fields.end())
							{
								if(!field->has_default_value())
								{
									m_log->error() << "Field " << field->get_name() << " missing when trying to create "
										"object of type " << dcc->get_name();

									resp.add_uint32(0);
									send(resp);
									return;
								}
								else
								{
									dbo.fields[field] = field->get_default_value();
								}
							}
						}
					}

					// Create object in database
					m_log->spam() << "Creating stored object..." << std::endl;
					unsigned int do_id = m_db_engine->create_object(dbo);
					if(do_id == 0 || do_id < m_min_id || do_id > m_max_id)
					{
						m_log->error() << "Ran out of DistributedObject ids while creating new object." << std::endl;
						resp.add_uint32(0);
						send(resp);
						return;
					}

					m_log->spam() << "... created with ID: " << do_id << std::endl;
					resp.add_uint32(do_id);
					send(resp);
//.........这里部分代码省略.........

void Client::add_interest(Interest &i, uint32_t context)
{
	std::unordered_set<uint32_t> new_zones;

	for(auto it = i.zones.begin(); it != i.zones.end(); ++it)
	{
		if(lookup_interests(i.parent, *it).empty())
		{
			new_zones.insert(*it);
		}
	}

	if(m_interests.find(i.id) != m_interests.end())
	{
		// This is an already-open interest that is actually being altered.
		// Therefore, we need to delete the objects that the client can see
		// through this interest only.

		Interest previous_interest = m_interests[i.id];
		std::unordered_set<uint32_t> killed_zones;

		for(auto it = previous_interest.zones.begin(); it != previous_interest.zones.end(); ++it)
		{
			if(lookup_interests(previous_interest.parent, *it).size() > 1)
			{
				// An interest other than the altered one can see this parent/zone,
				// so we don't care about it.
				continue;
			}

			// If we've gotten here: parent,*it is unique, so if the new interest
			// doesn't cover it, we add it to the killed zones.
			if(i.parent != previous_interest.parent || i.zones.find(*it) == i.zones.end())
			{
				killed_zones.insert(*it);
			}
		}

		// Now that we know what zones to kill, let's get to it:
		close_zones(previous_interest.parent, killed_zones);
	}
	m_interests[i.id] = i;

	if(new_zones.empty())
	{
		// We aren't requesting any new zones with this operation, so don't
		// bother firing off a State Server request. Instead, let the client
		// know we're already done:

		handle_interest_done(i.id, context);

		return;
	}

	InterestOperation *iop = new InterestOperation(i.id, context, i.parent, new_zones);

	uint32_t request_context = m_next_context++;
	m_pending_interests.insert(std::pair<uint32_t, InterestOperation*>(request_context, iop));

	Datagram resp;
	resp.add_server_header(i.parent, m_channel, STATESERVER_OBJECT_GET_ZONES_OBJECTS);
	resp.add_uint32(request_context);
	resp.add_uint32(i.parent);
	resp.add_uint16(new_zones.size());
	for(auto it = new_zones.begin(); it != new_zones.end(); ++it)
	{
		resp.add_uint32(*it);
		subscribe_channel(LOCATION2CHANNEL(i.parent, *it));
	}
	send(resp);
}