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(server, app_env) ⇒ ApplicationManager

Returns a new instance of ApplicationManager.



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# File 'lib/spring/application_manager.rb', line 9

def initialize(server, app_env)
  @server     = server
  @app_env    = app_env
  @spring_env = Env.new
  @mutex      = Mutex.new
end

Instance Attribute Details

#app_env ⇒ Object (readonly)

Returns the value of attribute app_env.



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# File 'lib/spring/application_manager.rb', line 7

def app_env
  @app_env
end

#child ⇒ Object (readonly)

Returns the value of attribute child.



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# File 'lib/spring/application_manager.rb', line 7

def child
  @child
end

#pid ⇒ Object (readonly)

Returns the value of attribute pid.



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# File 'lib/spring/application_manager.rb', line 7

def pid
  @pid
end

#server ⇒ Object (readonly)

Returns the value of attribute server.



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# File 'lib/spring/application_manager.rb', line 7

def server
  @server
end

#spring_env ⇒ Object (readonly)

Returns the value of attribute spring_env.



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# File 'lib/spring/application_manager.rb', line 7

def spring_env
  @spring_env
end

Instance Method Details

#alive? ⇒ Boolean

Returns:

  • (Boolean) 


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

def alive?
  @pid
end

#log(message) ⇒ Object 



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# File 'lib/spring/application_manager.rb', line 16

def log(message)
  server.log(message)
end

#restart ⇒ Object 



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

def restart
  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 63

def run(client)
  with_child do
    child.send_io client
    child.gets
  end

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

#start ⇒ Object 



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

def start
  start_child
  start_wait_thread
end

#stop ⇒ Object 



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# File 'lib/spring/application_manager.rb', line 80

def stop
  Process.kill('TERM', pid) if pid
end

#synchronize ⇒ Object

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 22

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

#with_child ⇒ Object 



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# File 'lib/spring/application_manager.rb', line 42

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