That’s not what I suggested. The idea is to run createScaledImage etc in the spawned process and send the image back. Your current implementation still runs all that in the requesting process, so it has the same problems as your old one.
The following ought to run it in the Agent instead. I haven’t checked if the code works or even compiles, but it will hopefully help you understand the general idea.
It would also be a good idea avoid using Agent for this since you may want these processes to die after they haven’t had any requests for a reasonable amount of time, or else they will hang around with their loaded images forever.
def image(conn, params) do
sopinstanceuid = params["sopinstanceuid"]
{width, ""} = Integer.parse(params["width"])
{height, ""} = Integer.parse(params["height"])
pid = ImageCache.get(sopinstanceuid)
if pid do
IO.puts("====> CACHED! <====")
IO.puts "Pid: #{inspect pid}"
pngimage = Agent.get(pid,
fn dcmff ->
Dcmtknif.createScaledImage(dcmff, width, height, 0, 0)
Dcmtknif.setMinMaxWindow(scaledImage)
Dcmtknif.getPNG(wlImage)
end)
conn
|> put_resp_content_type("image/png")
|> send_resp(200, pngimage)
else
im = ApiController.image(sopinstanceuid)
IO.puts(im.imagepath)
if File.exists?(im.imagepath) do
IO.puts("====> NOT CACHED, LOADING FROM FILE <====")
{:ok, pid} = Agent.start(fn -> Dcmtknif.load(im.imagepath) end)
ImageCache.put(sopinstanceuid, pid)
image(conn, params)
else
conn
|> send_resp(404, "File not found")
end
end
end
