Class: EventMachine::DeferrableChildProcess
- Inherits:
-
Connection
- Object
- Connection
- EventMachine::DeferrableChildProcess
- Includes:
- Deferrable
- Defined in:
- lib/em/processes.rb
Overview
EM::DeferrableChildProcess is a sugaring of a common use-case involving EM::popen. Call the #open method on EM::DeferrableChildProcess, passing a command-string. #open immediately returns an EM::Deferrable object. It also schedules the forking of a child process, which will execute the command passed to #open. When the forked child terminates, the Deferrable will be signalled and execute its callbacks, passing the data that the child process wrote to stdout.
Constant Summary
Constants included from Deferrable
EventMachine::Deferrable::Pool
Class Method Summary collapse
-
.open(cmd) ⇒ Object
Sugars a common use-case involving forked child processes.
Methods included from Deferrable
#callback, #cancel_callback, #cancel_errback, #cancel_timeout, #errback, #fail, future, #set_deferred_status, #succeed, #timeout
Methods inherited from Connection
#close_connection, #close_connection_after_writing, #comm_inactivity_timeout, #comm_inactivity_timeout=, #connection_completed, #detach, #error?, #get_idle_time, #get_peer_cert, #get_peername, #get_pid, #get_proxied_bytes, #get_sock_opt, #get_sockname, #get_status, #notify_readable=, #notify_readable?, #notify_writable=, #notify_writable?, #pause, #paused?, #pending_connect_timeout, #pending_connect_timeout=, #post_init, #proxy_completed, #proxy_incoming_to, #proxy_target_unbound, #reconnect, #resume, #send_data, #send_datagram, #send_file_data, #set_sock_opt, #ssl_handshake_completed, #ssl_verify_peer, #start_tls, #stop_proxying, #stream_file_data
Class Method Details
.open(cmd) ⇒ Object
Sugars a common use-case involving forked child processes.
open takes a String argument containing an shell command
string (including arguments if desired). #open immediately returns an EventMachine::Deferrable object, without blocking.
It also invokes EventMachine#popen to run the passed-in command in a forked child process.
When the forked child terminates, the Deferrable that
open calls its callbacks, passing the data returned
from the child process.
60 61 62 |
# File 'lib/em/processes.rb', line 60 def self.open cmd EventMachine.popen( cmd, DeferrableChildProcess ) end |