Class: Flydata::Helper::ActionOwnershipChannel

Inherits:
Object
  • Object
show all
Includes:
FlydataCore::Logger, MonitorMixin
Defined in:
lib/flydata/helper/action_ownership_channel.rb

Overview

Take care of action ownership management

  • Receive a request from both scheduler and worker.

  • Give a action with ownership to workers

Instance Method Summary collapse

Constructor Details

#initializeActionOwnershipChannel

Returns a new instance of ActionOwnershipChannel.


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 13

def initialize
  @action_ownership_map = ActionOwnership.action_ownership_map
  @queue = {}  # key: ["action_name", {<action_info>}]
  super
end

Instance Method Details

#dumpObject


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 101

def dump
  queue_info = @queue.collect{|k,v|
    "- #{k} #{v[:action_info]}"
  }.join("\n")

  map_info = @action_ownership_map.collect{|k,v|
    "- #{v.action_name} owner:\"#{v.owner}\" " +
    "retry:#{v.retry_count} " +
    "last:\"#{v.last_processed_time > 0 ? Time.at(v.last_processed_time).utc : '-'}\""
  }.join("\n")

  <<EOT

========
action_ownership_channel dump
# queue:
#{queue_info}
# action_ownership_map:
#{map_info}
========
EOT
end

#mapObject


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 90

def map
  @action_ownership_map.dup
end

#queueObject

For debug


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 86

def queue
  @queue.dup
end

#queue_key(action_name, action_info) ⇒ Object


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 44

def queue_key(action_name, action_info)
  [action_name, (action_info || {})[:id]].to_json
end

#remote_actions_exist?Boolean

Returns:

  • (Boolean)

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# File 'lib/flydata/helper/action_ownership_channel.rb', line 94

def remote_actions_exist?
  queue.any?{|k, v| v.kind_of?(Hash) &&
             v[:action_info].kind_of?(Hash) &&
             v[:action_info].has_key?(:id) }

end

#request_action(action_name, action_info = {}) ⇒ Object

Called from schdeduler and worker action_name must be symbol


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 21

def request_action(action_name, action_info = {})
  action_ownership = @action_ownership_map[action_name]
  if action_ownership.nil?
    # unknown action.  probably a new action
    log_error "[error] unsupported action `#{action_name}'. Skip."
    return false
  end

  qkey = queue_key(action_name, action_info)
  self.synchronize do
    if @queue.has_key?(qkey)
      false
    else
      @queue[qkey] =
                {
                  action_ownership: action_ownership,
                  action_info: action_info
                }
      true
    end
  end
end

#return_action_ownership(action_ownership) ⇒ Object

Called from worker only


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 78

def return_action_ownership(action_ownership)
  self.synchronize do
    action_ownership.owner = nil
    action_ownership.last_processed_time = Time.now.to_f
  end
end

#take_action_ownership(new_owner) ⇒ Object

Called from worker only


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# File 'lib/flydata/helper/action_ownership_channel.rb', line 49

def take_action_ownership(new_owner)
  self.synchronize do
    return nil if @queue.empty?

    # Check resource change flag
    rsc_act_running = @action_ownership_map.any? { |name, act_own|
        (act_own.resource_change && act_own.processing?) }

    target_key, target_action = @queue.find do |key, action|
      action_ownership = action[:action_ownership]

      # Wait until a same action will be processed
      next if action_ownership.processing?

      # Skip if another resource change action is running
      next if action_ownership.resource_change && rsc_act_running

      true
    end

    return nil if target_key.nil? || target_action.nil?
    @queue.delete(target_key)

    target_action[:action_ownership].owner = new_owner
    target_action
  end
end