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module EventMachine
# This is subclassed from EventMachine::Connection for use with the process monitoring API. Read the
# documentation on the instance methods of this class, and for a full explanation see EventMachine.watch_process.
class ProcessWatch < Connection
# @private
Cfork = 'fork'.freeze
# @private
Cexit = 'exit'.freeze
# @private
def receive_data(data)
case data
when Cfork
process_forked
when Cexit
process_exited
end
end
# Returns the pid that EventMachine::watch_process was originally called with.
def pid
@pid
end
# Should be redefined with the user's custom callback that will be fired when the prcess is forked.
#
# There is currently not an easy way to get the pid of the forked child.
def process_forked
end
# Should be redefined with the user's custom callback that will be fired when the process exits.
#
# stop_watching is called automatically after this callback
def process_exited
end
# Discontinue monitoring of the process.
# This will be called automatically when a process dies. User code may call it as well.
def stop_watching
EventMachine::unwatch_pid(@signature)
end
end
end
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