Hi,
I want to implement a hierarchy of events using protobuf.
Specifically, I have a main Event message type. These Events currently
can be either be a StatusEvent or a DetectionEvent. Here's the proto
definitions I came up with:
// A general event, can be thought as base Event class for other event
types.
message Event {
required int64 task_id = 1;
required string module_name = 2; // module that sent the event
extensions 100 to 199;
}
// Extend the base Event with additional types of events.
extend Event {
optional StatusEvent status_event = 100;
optional DetectionEvent detection_event = 101;
}
// A bounding box detected in a frame representing a region of
interest.
message DetectionEvent {
optional int64 frame = 1; // frame number (starting at 1) where
optional int64 time = 2;
optional string label = 3;
}
// Change of status in current module.
message StatusEvent {
enum EventType {
MODULE_START = 1;
MODULE_END = 2;
MODULE_FATAL = 3;
}
required EventType type = 1;
// Optional key-value pairs for data to be passed on.
message Data {
required string key = 1;
required string value = 2;
}
repeated Data data = 2;
}
This compiles with protoc. My problem is, after I create an Event, e,
I don't know how to add an extension event. I though the way to go was
myevents::Event e;
e.set_task_id( taskID );
e.set_module_name( moduleName );
// Create a status event
myevents::StatusEvent* se = e.AddExtension( myevents::status_event );
se->set_type( myevents::StatusEvent::MODULE_START );
myevents::StatusEvent::Data *data = se->add_data();
data->set_key( "frame_width" );
data->set_value( 100 );
When I do this, I get the following compilation error on my protobuf
header file:
‘Add’ is not a member of
‘google::protobuf::internal::MessageTypeTraits<myevents::StatusEvent>’
so clearly this is not the way to go. What is the correct way to do
this? Any help would be much appreciated.
Thanks!
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