Class: ComponentHost::Host

Inherits:
Object
  • Object
show all
Includes:
Dependency, Log::Dependency
Defined in:
lib/component_host/host.rb

Defined Under Namespace

Classes: Component

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.build ⇒ Object 



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# File 'lib/component_host/host.rb', line 9

def self.build
  instance = new
  Signal.configure instance
  instance.send = Actor::Messaging::Send
  instance
end

Instance Method Details

#abort ⇒ Object

Raises:

  • (StopIteration) 


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# File 'lib/component_host/host.rb', line 111

def abort
  raise StopIteration
end

#components ⇒ Object 



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# File 'lib/component_host/host.rb', line 107

def components
  @components ||= []
end

#log_observer ⇒ Object 



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# File 'lib/component_host/host.rb', line 103

def log_observer
  @log_observer ||= SupervisorObservers::Log.new
end

#record_error(&block) ⇒ Object 



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# File 'lib/component_host/host.rb', line 30

def record_error(&block)
  record_errors_observer.record_error_proc = block
end

#record_errors_observer ⇒ Object 



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# File 'lib/component_host/host.rb', line 99

def record_errors_observer
  @record_errors_observer ||= SupervisorObservers::RecordErrors.new
end

#register(initiator, name = nil, &block) ⇒ Object 



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# File 'lib/component_host/host.rb', line 16

def register(initiator, name=nil, &block)
  initiator ||= proc { yield }

  logger.trace { "Registering component (Component Initiator: #{initiator}, Name: #{name || '(none)'})" }

  component = Component.new initiator, name

  components << component

  logger.debug { "Registered component (Component Initiator: #{initiator}, Name: #{name || '(none)'})" }

  component
end

#registered?(&block) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/component_host/host.rb', line 115

def registered?(&block)
  block ||= proc { true }

  components.any? do |component|
    block.(component.initiator, component.name)
  end
end

#start(&probe) ⇒ Object 



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# File 'lib/component_host/host.rb', line 34

def start(&probe)
  started_components = []

  Actor::Supervisor.start do |supervisor|
    supervisor.add_observer record_errors_observer

    supervisor.add_observer log_observer

    signal.trap 'TSTP' do
      message = Actor::Messages::Suspend

      send.(message, supervisor.address)

      logger.info(tags: [:*, :signal]) { "Handled TSTP signal (Message Name: #{message.message_name}, SupervisorAddress: #{supervisor.address.id})" }
    end

    signal.trap 'CONT' do
      message = Actor::Messages::Resume

      send.(message, supervisor.address)

      logger.info(tags: [:*, :signal]) { "Handled CONT signal (Message Name: #{message.message_name}, SupervisorAddress: #{supervisor.address.id})" }
    end

    signal.trap 'INT' do
      message = Actor::Messages::Shutdown

      send.(message, supervisor.address)

      logger.info(tags: [:*, :signal]) { "Handled INT signal (Message Name: #{message.message_name}, SupervisorAddress: #{supervisor.address.id})" }
    end

    signal.trap 'TERM' do
      message = Actor::Messages::Shutdown

      send.(message, supervisor.address)

      logger.info(tags: [:*, :signal]) { "Handled TERM signal (Message Name: #{message.message_name}, SupervisorAddress: #{supervisor.address.id})" }
    end

    start_components do |component|
      started_components << component
    end

    probe.(supervisor) if probe
  end

  started_components
end

#start_components(&block) ⇒ Object 



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# File 'lib/component_host/host.rb', line 84

def start_components(&block)
  components.each do |component|
    logger.info(tag: :*) { "Starting component: #{component.initiator} (Name: #{component.name || '(none)'})" }
    component.start
    logger.info(tag: :*) { "Started component: #{component.initiator} (Name: #{component.name || '(none)'})" }

    block.(component) if block
  end

rescue => error
  record_errors_observer.(error)
  logger.fatal(tags: [:*, :component, :lifecycle]) { "#{error.message} (Error: #{error.class})" }
  raise error
end