"ping" client or server message."pong" client or server message.Principal from Spring Security context via
SecurityContext.getAuthentication().QueryByExampleExecutor
into the target projectionType.ReactiveQueryByExampleExecutor
into the target projectionType.QuerydslPredicateExecutor
into the target projectionType.ReactiveQuerydslPredicateExecutor
into the target projectionType.@ProjectedPayload,
either based on the complete DataFetchingEnvironment.getArguments()
map, or based on a specific argument within the map when the method
parameter is annotated with @Argument.ProjectedPayloadMethodArgumentResolver using the given context.