GracefulExit

Repository for testing the graceful exit behavior in Elixir app

How to test localy:

1. iex -S mix or mix release & _build/dev/rel/graceful_exit/bin/graceful_exit start
2. (in another terminal window) ps and grab PID of beam
3. (in another terminal window) kill PID - that sends SIGTERM signal to the application

ContinueWorker is a simple GenServer that emulates items processing and is based on :continue reply

Behavior on SIGTERM signal:

• terminate callback isn't called
• after 10 seconds (shutdown time option) exits

AsyncWorker is simple a GenServer that emulates items processing and is based on Kernel.send/2

Behavior on SIGTERM signal:

• terminate callback is called
• exits after the terminate callback finishes

DynamicSupervisor usage

test exit

1. iex -S mix
2. s = GracefulExit.ItemProcessingSupervisor
3. start the first task DynamicSupervisor.start_child(s, {GracefulExit.AsyncWorker, Enum.to_list(1..60)})
4. start the second task DynamicSupervisor.start_child(s, {GracefulExit.AsyncWorker, Enum.to_list(1..60)})
5. (in another terminal window) ps and grab PID of beam
6. (in another terminal window) kill PID - that sends SIGTERM signal to the application

test normal finish

1. iex -S mix
2. s = GracefulExit.ItemProcessingSupervisor
3. DynamicSupervisor.start_child(s, {GracefulExit.AsyncWorker, Enum.to_list(1..5)})
4. wait ~5 seconds
5. DynamicSupervisor.count_children(s)