Class: ChildProcess::AbstractProcess

Inherits:
Object
  • Object
show all
Defined in:
lib/childprocess/abstract_process.rb

Direct Known Subclasses

JRuby::Process, Unix::Process, Windows::Process

Constant Summary

POLL_INTERVAL =
0.1

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(args) ⇒ AbstractProcess

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future.

Create a new process with the given args.

See Also:



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# File 'lib/childprocess/abstract_process.rb', line 43

def initialize(args)
  unless args.all? { |e| e.kind_of?(String) }
    raise ArgumentError, "all arguments must be String: #{args.inspect}"
  end

  @args        = args
  @started     = false
  @exit_code   = nil
  @io          = nil
  @cwd         = nil
  @detach      = false
  @duplex      = false
  @leader      = false
  @environment = {}
end

Instance Attribute Details

#cwdObject

Set the child's current working directory.



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# File 'lib/childprocess/abstract_process.rb', line 25

def cwd
  @cwd
end

#detachObject

Set this to true if you do not care about when or if the process quits.



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# File 'lib/childprocess/abstract_process.rb', line 10

def detach
  @detach
end

#duplexObject

Set this to true if you want to write to the process' stdin (process.io.stdin)



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# File 'lib/childprocess/abstract_process.rb', line 15

def duplex
  @duplex
end

#environmentObject (readonly)

Modify the child's environment variables



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# File 'lib/childprocess/abstract_process.rb', line 20

def environment
  @environment
end

#exit_codeObject (readonly)

Returns the value of attribute exit_code



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# File 'lib/childprocess/abstract_process.rb', line 5

def exit_code
  @exit_code
end

#leaderObject

Set this to true to make the child process the leader of a new process group

This can be used to make sure that all grandchildren are killed when the child process dies.



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# File 'lib/childprocess/abstract_process.rb', line 34

def leader
  @leader
end

Instance Method Details

#alive?Boolean

Is this process running?

Returns:

  • (Boolean)


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# File 'lib/childprocess/abstract_process.rb', line 124

def alive?
  started? && !exited?
end

#crashed?Boolean

Returns true if the process has exited and the exit code was not 0.

Returns:

  • (Boolean)


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# File 'lib/childprocess/abstract_process.rb', line 134

def crashed?
  exited? && @exit_code != 0
end

#exited?Boolean

Did the process exit?

Returns:

  • (Boolean)

Raises:



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# File 'lib/childprocess/abstract_process.rb', line 114

def exited?
  raise SubclassResponsibility, "exited?"
end

#ioObject

Returns a ChildProcess::AbstractIO subclass to configure the child's IO streams.



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# File 'lib/childprocess/abstract_process.rb', line 63

def io
  raise SubclassResponsibility, "io"
end

#pidFixnum

Returns the pid of the process after it has started

Returns:

  • (Fixnum)

    the pid of the process after it has started

Raises:



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# File 'lib/childprocess/abstract_process.rb', line 71

def pid
  raise SubclassResponsibility, "pid"
end

#poll_for_exit(timeout) ⇒ Object

Wait for the process to exit, raising a ChildProcess::TimeoutError if the timeout expires.



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# File 'lib/childprocess/abstract_process.rb', line 143

def poll_for_exit(timeout)
  log "polling #{timeout} seconds for exit"

  end_time = Time.now + timeout
  until (ok = exited?) || Time.now > end_time
    sleep POLL_INTERVAL
  end

  unless ok
    raise TimeoutError, "process still alive after #{timeout} seconds"
  end
end

#startAbstractProcess

Launch the child process

Returns:



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# File 'lib/childprocess/abstract_process.rb', line 81

def start
  launch_process
  @started = true

  self
end

#stop(timeout = 3) ⇒ Object

Forcibly terminate the process, using increasingly harsher methods if possible.

Parameters:

  • timeout (Fixnum) (defaults to: 3)

    (3) Seconds to wait before trying the next method.

Raises:



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# File 'lib/childprocess/abstract_process.rb', line 94

def stop(timeout = 3)
  raise SubclassResponsibility, "stop"
end

#waitFixnum

Block until the process has been terminated.

Returns:

  • (Fixnum)

    The exit status of the process

Raises:



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# File 'lib/childprocess/abstract_process.rb', line 104

def wait
  raise SubclassResponsibility, "wait"
end