Class: Spring::ApplicationManager

Inherits:
Object
  • Object
show all
Defined in:
lib/spring/application_manager.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app_env) ⇒ ApplicationManager

Returns a new instance of ApplicationManager.


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# File 'lib/spring/application_manager.rb', line 5

def initialize(app_env)
  @app_env    = app_env
  @spring_env = Env.new
  @mutex      = Mutex.new
  @state      = :running
end

Instance Attribute Details

#app_envObject (readonly)

Returns the value of attribute app_env


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# File 'lib/spring/application_manager.rb', line 3

def app_env
  @app_env
end

#childObject (readonly)

Returns the value of attribute child


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# File 'lib/spring/application_manager.rb', line 3

def child
  @child
end

#pidObject (readonly)

Returns the value of attribute pid


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# File 'lib/spring/application_manager.rb', line 3

def pid
  @pid
end

#spring_envObject (readonly)

Returns the value of attribute spring_env


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# File 'lib/spring/application_manager.rb', line 3

def spring_env
  @spring_env
end

#statusObject (readonly)

Returns the value of attribute status


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# File 'lib/spring/application_manager.rb', line 3

def status
  @status
end

Instance Method Details

#alive?Boolean

Returns:

  • (Boolean)

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# File 'lib/spring/application_manager.rb', line 34

def alive?
  @pid
end

#log(message) ⇒ Object


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# File 'lib/spring/application_manager.rb', line 12

def log(message)
  spring_env.log "[application_manager:#{app_env}] #{message}"
end

#restartObject


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# File 'lib/spring/application_manager.rb', line 29

def restart
  return if @state == :stopping
  start_child(true)
end

#run(client) ⇒ Object

Returns the pid of the process running the command, or nil if the application process died.


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# File 'lib/spring/application_manager.rb', line 59

def run(client)
  with_child do
    child.send_io client
    child.gets or raise Errno::EPIPE
  end

  pid = child.gets.to_i

  unless pid.zero?
    log "got worker pid #{pid}"
    pid
  end
rescue Errno::ECONNRESET, Errno::EPIPE => e
  log "#{e} while reading from child; returning no pid"
  nil
ensure
  client.close
end

#startObject


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# File 'lib/spring/application_manager.rb', line 25

def start
  start_child
end

#stopObject


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# File 'lib/spring/application_manager.rb', line 78

def stop
  log "stopping"
  @state = :stopping

  if pid
    Process.kill('TERM', pid)
    Process.wait(pid)
  end
rescue Errno::ESRCH, Errno::ECHILD
  # Don't care
end

#synchronizeObject

We're not using @mutex.synchronize to avoid the weird “<internal:prelude>:10” line which messes with backtraces in e.g. rspec


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# File 'lib/spring/application_manager.rb', line 18

def synchronize
  @mutex.lock
  yield
ensure
  @mutex.unlock
end

#with_childObject


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# File 'lib/spring/application_manager.rb', line 38

def with_child
  synchronize do
    if alive?
      begin
        yield
      rescue Errno::ECONNRESET, Errno::EPIPE
        # The child has died but has not been collected by the wait thread yet,
        # so start a new child and try again.
        log "child dead; starting"
        start
        yield
      end
    else
      log "child not running; starting"
      start
      yield
    end
  end
end