Hello, I have a question. I want to perform a simp...

# coroutines

[frellan]

Hello, I have a question. I want to perform a simple background job using coroutines. Currently I have an object that does stuff and writes to a status object that I can then read to know the state of the job (like how many items are processed etc). This is obviously crap because I currently block the entire server. I now want to redo this the right way. I use launch since the job doesnt return anything, it just does stuff. I know I can ask that job isActive() and stuff like that but how can I ask access that jobs memory, like shared memory? I just want to ask how many items it has processed etc so I can show that in my frontend.

[zachtib]

maybe use a Channel to send updates on progress? Like a Channel<Int> in your case?

[zachtib]

from the docs:
val channel = Channel<Int>()
launch {
for (x in 1..5) channel.send(x * x)
channel.close() // we're done sending
}
// here we print received values using for loop (until the channel is closed)
for (y in channel) println(y)
println("Done!")

[zachtib]

you could have your function return that channel after the launch, and have the caller then observe it

[yschimke]

There are a few things here to unpack, firstly you can have a long running HTTP task that doesn't block the server, e.g. a delay() should free up the thread anyway so the server isn't blocked.

[yschimke]

Is server, like client/server here? i.e. the client should show updates?

[yschimke]

Maybe it's a good fit for websockets, to update the client?

[frellan]

Yeah it probably is. I didnt really bother with it though because this is not the official webpage, just some tooling for myself.