Class: RFlow::ChildProcess

Inherits:
Object
  • Object
show all
Defined in:
lib/rflow/child_process.rb

Direct Known Subclasses

Broker, Shard::Worker

Constant Summary collapse

SIGINFO = 
29

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, role = name) ⇒ ChildProcess

Returns a new instance of ChildProcess.



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# File 'lib/rflow/child_process.rb', line 9

def initialize(name, role = name)
  @name = name
  @role = role
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/rflow/child_process.rb', line 5

def name
  @name
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/rflow/child_process.rb', line 5

def pid
  @pid
end

Instance Method Details

#run_child_process ⇒ Object 



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# File 'lib/rflow/child_process.rb', line 29

def run_child_process
  @child_pipe_w.close
  register_logging_context
  update_process_name
  detach_process_group
  handle_signals

  RFlow.logger.info "#{@role} started"
  run_process
  exit 0
ensure
  unhandle_signals
end

#run_process ⇒ Object 



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# File 'lib/rflow/child_process.rb', line 43

def run_process; end

#shutdown!(signal) ⇒ Object 



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# File 'lib/rflow/child_process.rb', line 45

def shutdown!(signal)
  RFlow.logger.info "Shutting down due to #{signal}"
  unhandle_signals
end

#spawn! ⇒ Object

Launch another process to execute the child. The parent process retains the original worker object (with pid and IPC pipe) to allow for process management



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# File 'lib/rflow/child_process.rb', line 17

def spawn!
  establish_child_pipe
  drop_database_connections

  @pid = fork
  if @pid
    return_after_child_starts
  else
    run_child_process
  end
end