Class: ActionCable::Server::Worker

Inherits:
Object
  • Object
show all
Includes:
ActiveRecordConnectionManagement, ActiveSupport::Callbacks
Defined in:
actioncable/lib/action_cable/server/worker.rb,
actioncable/lib/action_cable/server/worker/active_record_connection_management.rb

Overview

Worker used by Server.send_async to do connection work in threads.

Defined Under Namespace

Modules: ActiveRecordConnectionManagement

Constant Summary

Constants included from ActiveSupport::Callbacks

ActiveSupport::Callbacks::CALLBACK_FILTER_TYPES

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from ActiveRecordConnectionManagement

#with_database_connections

Methods included from ActiveSupport::Concern

#append_features, #class_methods, extended, #included

Methods included from ActiveSupport::Callbacks

#run_callbacks

Constructor Details

#initialize(max_size: 5) ⇒ Worker


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# File 'actioncable/lib/action_cable/server/worker.rb', line 19

def initialize(max_size: 5)
  @executor = Concurrent::ThreadPoolExecutor.new(
    min_threads: 1,
    max_threads: max_size,
    max_queue: 0,
  )
end

Instance Attribute Details

#executorObject (readonly)

Returns the value of attribute executor


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# File 'actioncable/lib/action_cable/server/worker.rb', line 17

def executor
  @executor
end

Instance Method Details

#async_exec(receiver, *args, connection:, &block) ⇒ Object


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# File 'actioncable/lib/action_cable/server/worker.rb', line 47

def async_exec(receiver, *args, connection:, &block)
  async_invoke receiver, :instance_exec, *args, connection: connection, &block
end

#async_invoke(receiver, method, *args, connection: receiver, &block) ⇒ Object


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# File 'actioncable/lib/action_cable/server/worker.rb', line 51

def async_invoke(receiver, method, *args, connection: receiver, &block)
  @executor.post do
    invoke(receiver, method, *args, connection: connection, &block)
  end
end

#haltObject

Stop processing work: any work that has not already started running will be discarded from the queue


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# File 'actioncable/lib/action_cable/server/worker.rb', line 29

def halt
  @executor.shutdown
end

#invoke(receiver, method, *args, connection:, &block) ⇒ Object


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# File 'actioncable/lib/action_cable/server/worker.rb', line 57

def invoke(receiver, method, *args, connection:, &block)
  work(connection) do
    receiver.send method, *args, &block
  rescue Exception => e
    logger.error "There was an exception - #{e.class}(#{e.message})"
    logger.error e.backtrace.join("\n")

    receiver.handle_exception if receiver.respond_to?(:handle_exception)
  end
end

#stopping?Boolean


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# File 'actioncable/lib/action_cable/server/worker.rb', line 33

def stopping?
  @executor.shuttingdown?
end

#work(connection) ⇒ Object


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# File 'actioncable/lib/action_cable/server/worker.rb', line 37

def work(connection)
  self.connection = connection

  run_callbacks :work do
    yield
  end
ensure
  self.connection = nil
end