Julia: How to iterate with Channel

Question

When I run the following code, I get a deprecation saying produce has been replace with channels.

function source(dir)
    filelist = readdir(dir)

    for f         


        

Answer 1

Here's one way. Modify your function to accept a channel argument, and put! data in it:

function source(dir, chnl)
  filelist = readdir(dir)
  for filename in filelist
    name, ext = splitext(filename)
    if ext == ".jld"
      put!(chnl, filename)  % this blocks until "take!" is used elsewhere
    end
  end
end

Then create your task implicitly using the Channel constructor (which takes a function with a single argument only representing the channel, so we need to wrap the source function around an anonymous function):

my_channel = Channel( (channel_arg) -> source( pwd(), channel_arg) )

Then, either check the channel is still open (i.e. task hasn't finished) and if so take an argument:

julia> while isopen( my_channel)
         take!( my_channel) |> println;
       end
no.jld
yes.jld

or, use the channel itself as an iterator (iterating over Tasks is becoming deprecated, along with the produce / consume functionality)

julia> for i in my_channel
         i |> println
       end
no.jld
yes.jld

Alternatively you can use @schedule with bind etc as per the documentation, but it seems like the above is the most straightforward way.