Class: Daemons::ApplicationGroup

Inherits:
Object
  • Object
show all
Defined in:
lib/daemons/application_group.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(app_name, options = {}) ⇒ ApplicationGroup

Returns a new instance of ApplicationGroup.


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# File 'lib/daemons/application_group.rb', line 24

def initialize(app_name, options = {})
  @app_name = app_name
  @options = options

  if options[:script]
    @script = File.expand_path(options[:script])
  end

  # @controller = controller
  @monitor = nil

  # options = controller.options

  @multiple = options[:multiple] || false

  @dir_mode = options[:dir_mode] || :script
  @dir = options[:dir] || ''

  @keep_pid_files = options[:keep_pid_files] || false
  @no_pidfiles = options[:no_pidfiles] || false

  # @applications = find_applications(pidfile_dir())
  @applications = []
end

Instance Attribute Details

#app_argvObject

Returns the value of attribute app_argv


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# File 'lib/daemons/application_group.rb', line 16

def app_argv
  @app_argv
end

#app_nameObject (readonly)

Returns the value of attribute app_name


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# File 'lib/daemons/application_group.rb', line 4

def app_name
  @app_name
end

#applicationsObject (readonly)

Returns the value of attribute applications


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# File 'lib/daemons/application_group.rb', line 13

def applications
  @applications
end

#controller_argvObject

Returns the value of attribute controller_argv


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# File 'lib/daemons/application_group.rb', line 15

def controller_argv
  @controller_argv
end

#dirObject

Returns the value of attribute dir


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# File 'lib/daemons/application_group.rb', line 19

def dir
  @dir
end

#dir_modeObject

Returns the value of attribute dir_mode


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# File 'lib/daemons/application_group.rb', line 18

def dir_mode
  @dir_mode
end

#monitorObject (readonly)

Returns the value of attribute monitor


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# File 'lib/daemons/application_group.rb', line 7

def monitor
  @monitor
end

#multipleObject (readonly)

true if the application is supposed to run in multiple instances


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# File 'lib/daemons/application_group.rb', line 22

def multiple
  @multiple
end

#optionsObject (readonly)

attr_reader :controller


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# File 'lib/daemons/application_group.rb', line 11

def options
  @options
end

#scriptObject (readonly)

Returns the value of attribute script


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# File 'lib/daemons/application_group.rb', line 5

def script
  @script
end

Instance Method Details

#create_monitor(an_app) ⇒ Object


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# File 'lib/daemons/application_group.rb', line 139

def create_monitor(an_app)
  if @monitor && options[:monitor]
    @monitor.stop
    @monitor = nil
  end

  if options[:monitor]
    @monitor = Monitor.new(an_app)
    @monitor.start(self)
  end
end

#find_applications(dir) ⇒ Object


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# File 'lib/daemons/application_group.rb', line 61

def find_applications(dir)
  if @no_pidfiles
    return find_applications_by_app_name(app_name)
  else
    return find_applications_by_pidfiles(dir)
  end
end

#find_applications_by_app_name(app_name) ⇒ Object

TODO: identifiy the monitor process


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# File 'lib/daemons/application_group.rb', line 70

def find_applications_by_app_name(app_name)
  pids = []

  begin
    x = `ps auxw | grep -v grep | awk '{print $2, $11, $12}' | grep #{app_name}`
    if x && x.chomp!
      processes = x.split(/\n/).compact
      processes = processes.delete_if do |p|
        pid, name, add = p.split(/\s/)
        # We want to make sure that the first part of the process name matches
        # so that app_name matches app_name_22

        app_name != name[0..(app_name.length - 1)] and not add.include?(app_name)
      end
      pids = processes.map { |p| p.split(/\s/)[0].to_i }
    end
    rescue ::Exception
  end

  pids.map do |f|
    app = Application.new(self, {}, PidMem.existing(f))
    setup_app(app)
    app
  end
end

#find_applications_by_pidfiles(dir) ⇒ Object


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# File 'lib/daemons/application_group.rb', line 96

def find_applications_by_pidfiles(dir)
  @monitor = Monitor.find(dir, app_name + '_monitor')

  pid_files = PidFile.find_files(dir, app_name, ! @keep_pid_files)
  pid_files.map do |f|
    app = Application.new(self, {}, PidFile.existing(f))
    setup_app(app)
    app
  end
end

#new_application(add_options = {}) ⇒ Object


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# File 'lib/daemons/application_group.rb', line 107

def new_application(add_options = {})
  if @applications.size > 0 && !@multiple
    if options[:force]
      @applications.delete_if do |a|
        unless a.running?
          a.zap
          true
        end
      end
    end

    fail RuntimeException.new('there is already one or more instance(s) of the program running') unless @applications.empty?
  end

  app = Application.new(self, add_options)

  setup_app(app)

  @applications << app

  app
end

#pidfile_dirObject


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# File 'lib/daemons/application_group.rb', line 57

def pidfile_dir
  PidFile.dir(@dir_mode, @dir, script)
end

#reload_allObject


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# File 'lib/daemons/application_group.rb', line 180

def reload_all
  @applications.each { |a| a.reload }
end

#running?Boolean

Check whether at least one of the applications in the group is running. If yes, return true.

Returns:

  • (Boolean)

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# File 'lib/daemons/application_group.rb', line 195

def running?
  @applications.each { |a| return true if a.running? }
  return false
end

#setupObject

Setup the application group. Currently this functions calls find_applications which finds all running instances of the application and populates the application array.


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# File 'lib/daemons/application_group.rb', line 53

def setup
  @applications = find_applications(pidfile_dir)
end

#show_statusObject


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# File 'lib/daemons/application_group.rb', line 190

def show_status
  @applications.each { |a| a.show_status }
end

#start_allObject


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# File 'lib/daemons/application_group.rb', line 151

def start_all
  @monitor.stop if @monitor
  @monitor = nil

  @applications.each do |a|
    fork do
      a.start
    end
  end
end

#stop_all(no_wait = false) ⇒ Object


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# File 'lib/daemons/application_group.rb', line 162

def stop_all(no_wait = false)
  if @monitor
    @monitor.stop
    @monitor = nil
    setup
  end

  threads = []

  @applications.each do |a|
    threads << Thread.new do
      a.stop(no_wait)
    end
  end

  threads.each { |t| t.join }
end

#zap_allObject


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# File 'lib/daemons/application_group.rb', line 184

def zap_all
  @monitor.stop if @monitor

  @applications.each { |a| a.zap }
end