Broadcasting facilities between clients and server
Module Eliom_bus
Module Eliom_bus : sig end
Broadcasting facilities between clients and server
=== Please read the {% <<a_manual chapter="clientserver-communication" | chapter on communication >> %} of Eliom's manual before this page to learn how client and server parts communicate. ===
type ('a, 'b) t
The type of bus's carrying values of type 'a . Bus's are values that can be easily shared among clients. Each of these clients along with the server can send a value on the bus. Values can be received by each of the participants as a stream. Note that no effort is put to order message receptions on the different participants.
val create : ?scope:[< Eliom_comet.Channel.comet_scope ] -> ?name:string -> ?size:int -> 'a Deriving_Json.t -> ('a, 'a) t
create ?scope ?name ?size ?filter t creates a fresh bus. The scope parameter is used to chose the kind of channel on which the bus rely (See Eliom_comet.create for more information). The ?name argument allow one to make bus's persistent over server restart. The size argument behaves like the one on Eliom_comet.Channel.create . If ?filter argument is present, data is filtered through this function before entering the bus. Use this for example if you want to add some information, like IP address, or user id.
val create_filtered : ?scope:[< Eliom_comet.Channel.comet_scope ] -> ?name:string -> ?size:int -> filter:('a -> 'b Lwt.t) -> 'a Deriving_Json.t -> ('a, 'b) t
Same as create , but data is filtered through filter function before entering the bus. Use this for example if you want to add some information, like IP address, or user id.
val stream : ('a, 'b) t -> 'b Lwt_stream.t
stream b returns the stream of data sent to bus b . Notice you sould not use that function multiple times on the same bus, it will return the same stream. If you want to receive multiple times the same data, you sould copy the stream with Lwt_stream.clone
val write : ('a, 'b) t -> 'a -> unit Lwt.t
write b x sends the value x on the bus b . Every participant, including the server, will receive x .