Group of direct writers. Groups are optimized for sending the same message to multiple clients at once.
module Buffer : sig ... end
A group internally holds a buffer to serialize messages only once. This buffer will grow automatically to accomodate bigger messages.
flushed t is determined when the underlying writer for each member of
t is flushed.
Add a direct stream writer to the group. Raises if the writer is closed or already part of the group, or if its bin-prot writer is different than an existing group member's. When the writer is closed, it is automatically removed from the group.
Remove a writer from a group. Note that writers are automatically removed from all groups when they are closed, so you only need to call this if you want to remove a writer without closing it.
Write a message on all direct writers in the group. Contrary to
Direct_stream_writer.write, this cannot return
`Closed as elements of the group are removed immediately when they are closed.
write t x is the same as
write_without_pushback t x; flushed t.
val write_without_pushback : 'a t -> 'a -> unit
val length : _ t -> int
module Expert : sig ... end