Let us say I have one supervisor and I need execute some start_child
for this supervisor. Must I first start all of start my supervisors? Or can I only supervisor:start_child(my_sup,[])
without my_sup starting?
Do supervisors need to start their own supervisor?
3.9k views Asked by 0xAX At
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First you create a supervisor process as part of a supervision tree calling
supervisor:start_link/2
orsupervisor:start_link/3
. The created supervisor process callsModule:init/1
to find out about restart strategy, maximum restart frequency and child specifications.This is the example code for a supervisor starting gen_server (though, you may start other gen_* modules):
The tuple
{ch3, ...}
is a child specification, which is defined this way:The child specification to start the server
ch3
in the example above looks like:From the example you see that module
ch3
will be started, monitored and stopped by supervisor, you also seeone_for_one
restart strategy specified which is generally used.one_for_one
in the child specification means that if one child process terminates and should be restarted, only that child process is affected, and this is probably your case. Your child processes are started, monitored, restarted and stopped automatically by supervisor.start_child/2
is used to dynamically add a child specification to the supervisorSupRef
which starts the corresponding child process.Thus supervisour is always started first, then its child processes are started automatically or manually based on the restart strategies.