Class: SimplerWorkflow::Activity

Inherits:
Object
  • Object
show all
Includes:
OptionsAsMethods
Defined in:
lib/simpler_workflow/activity.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Methods included from OptionsAsMethods

#method_missing

Constructor Details

#initialize(domain, name, version, options = {}) ⇒ Activity

Returns a new instance of Activity.



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# File 'lib/simpler_workflow/activity.rb', line 7

def initialize(domain, name, version, options = {})
  default_options =
    {
    :default_task_list => name,
    :default_task_start_to_close_timeout => 5 * 60,
    :default_task_schedule_to_start_timeout => 5 * 60,
    :default_task_schedule_to_close_timeout => 10 * 60,
    :default_task_heartbeat_timeout => :none
  }
  @options = default_options.merge(options)
  @domain = domain
  @name = name
  @version = version
  @failure_policy = :fail
  @task_list = name.to_s
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method in the class SimplerWorkflow::OptionsAsMethods

Instance Attribute Details

#domain ⇒ Object (readonly)

Returns the value of attribute domain.



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# File 'lib/simpler_workflow/activity.rb', line 5

def domain
  @domain
end

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/simpler_workflow/activity.rb', line 5

def name
  @name
end

#next_activity ⇒ Object (readonly)

Returns the value of attribute next_activity.



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# File 'lib/simpler_workflow/activity.rb', line 5

def next_activity
  @next_activity
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/simpler_workflow/activity.rb', line 5

def options
  @options
end

#task_list ⇒ Object (readonly)

Returns the value of attribute task_list.



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# File 'lib/simpler_workflow/activity.rb', line 5

def task_list
  @task_list
end

#version ⇒ Object (readonly)

Returns the value of attribute version.



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# File 'lib/simpler_workflow/activity.rb', line 5

def version
  @version
end

Class Method Details

.[](*activity_tuple) ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 163

def self.[](*activity_tuple)
  activities[*activity_tuple]
end

.[]=(*activity_tuple) ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 167

def self.[]=(*activity_tuple)
  activities.[]=(*activity_tuple)
end

.register(domain, name, version, activity) ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 171

def self.register(domain, name, version, activity)
  activities.register(domain, name, version, activity)
end

Instance Method Details

#count ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 159

def count
  domain.activity_tasks.count(name).to_i
end

#failure_policy ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 42

def failure_policy
  @failure_policy || :fail
end

#on_fail(failure_policy) ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 38

def on_fail(failure_policy)
  @failure_policy = failure_policy.to_sym
end

#on_success(activity, version = nil) ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 24

def on_success(activity, version = nil)
  case activity
  when Hash
    name = activity[:name].to_sym
    version = activity[:version]
  when String
    name = activity.to_sym
  when Symbol
    name = activity
  end

  @next_activity = Activity[domain, name, version]
end

#perform_activity(&block) ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 46

def perform_activity(&block)
  @perform_task = block
end

#perform_task(task) ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 54

def perform_task(task)
  logger.info("Performing task #{name}")
  @perform_task.call(task)
rescue => e
  context = {}
  context[:activity_type] = [name.to_s, version]
  context[:input] = task.input
  context[:activity_id] = task.activity_id
  SimplerWorkflow.exception_reporter.report(e, context)
  task.fail! :reason => e.message[0..250], :details => {:failure_policy => failure_policy}.to_json
end

#persist_attributes ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 70

def persist_attributes
  activities.persist_attributes(self)
end

#poll_for_single_task ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 154

def poll_for_single_task
  logger.info("Polling for single task for #{name}")
  domain.activity_tasks.poll_for_single_task(name.to_s)
end

#simple_db_attributes ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 74

def simple_db_attributes
  attributes = {
    domain: domain.name,
    name: name,
    version: version,
    failure_policy: failure_policy
  }

  if (next_activity)
    attributes[:next_activity_name] = next_activity.name
    attributes[:next_activity_version] = next_activity.version
  end

  attributes
end

#simple_db_name ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 90

def simple_db_name
  "#{name}-#{version}"
end

#start_activity_loop ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 94

def start_activity_loop
  SimplerWorkflow.child_processes << fork do

    $0 = "Activity: #{name} #{version}"

    Signal.trap('QUIT') do
      # Don't log in trap, ruby 2 complains
      # since we need to exit quickly, only delay quit
      # if we are in the middle of a task
      if @in_task
        @time_to_exit = true 
      else
        Process.exit 0
      end
    end

    Signal.trap('INT') do
      # Don't log in trap, ruby 2 complains
      Process.exit!(0)
    end


    if SimplerWorkflow.after_fork
      SimplerWorkflow.after_fork.call
    end

    loop do
      begin
        logger.info("Starting activity_loop for #{name}")
        domain.activity_tasks.poll(task_list) do |task|
          begin
            logger.info("Received task...")
            @in_task = true
            perform_task(task)
            unless task.responded?
              task.complete!
            end
          rescue => e
            context = {}
            context[:activity_type] = [name.to_s, version]
            context[:input] = task.input
            context[:activity_id] = task.activity_id
            SimplerWorkflow.exception_reporter.report(e, context)
            task.fail! :reason => e.message, :details => { :failure_policy => :fail }.to_json unless task.responded?
          ensure
            @in_task = false
          end
        end
        Process.exit(0) if @time_to_exit
      rescue Timeout::Error
        if @time_to_exit
          Process.exit(0)
        else
          retry
        end
      end
    end
  end
end

#to_activity_type ⇒ Object 



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# File 'lib/simpler_workflow/activity.rb', line 66

def to_activity_type
  domain.activity_types[name, version]
end