Asynchronous workflows
WebSharper supports
F# asynchronous workflows
on the client,
implementing them with JavaScript callbacks.
As in F#, a workflow of type
async<'T>
represents a program that can
be invoked to either succeed with a result
'T
asynchronously or fail
with an exception. The limitations on the client are:
All parallelism is cooperative as the JavaScript runtime is single-threaded.
You have to yield control inside a
workflow to let other workflows execute.
Yielding of control happens implicitly every time whenever F# inserts
a call to an
AsyncBuilder
call.
This includes where you use a
let
or
let!
, every iteration of a
for
or
while
loop,
or between consecutive statements on the top level of an async block.
There is no way to use
Async.RunSynchronously
.
Cancellation is supported, in standard .NET/F# ways. If a cancellation occurs
when waiting on an aynchronous remote call, the response from the server gets
discarded without converting the JSON back to an object graph.
