# Copyright 2008-2012 Red Hat, Inc, and individual contributors.
# 
# This is free software; you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as
# published by the Free Software Foundation; either version 2.1 of
# the License, or (at your option) any later version.
# 
# This software is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
# 
# You should have received a copy of the GNU Lesser General Public
# License along with this software; if not, write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301 USA, or see the FSF site: http://www.fsf.org.

require 'torquebox/messaging/queue'
require 'torquebox/messaging/future_responder'
require 'torquebox/messaging/future'
require 'torquebox/messaging/future_status'

module TorqueBox
  module Messaging
    
    class Task
      include FutureStatus
      
      def self.queue_name( name = self.name[0...-4] )
        suffix = org.torquebox.core.util.StringUtils.underscore(name)
        "/queues/torquebox/#{ENV['TORQUEBOX_APP_NAME']}/tasks/#{suffix}"
      end

      def self.async(method, payload = {}, options = {})
        queue = Queue.new( queue_name )
        future = Future.new( queue )
        message = {
          :method => method,
          :payload => payload,
          :future_id => future.correlation_id,
          :future_queue => queue_name
        }
        options[:encoding] = :marshal
        queue.publish( message, options )
        
        future
      rescue javax.naming.NameNotFoundException => ex
        raise RuntimeError.new("The queue for #{self.name} is not available. Did you disable it by setting its concurrency to 0?")
      end

      def process!(message)
        hash = message.decode
        FutureResponder.new( Queue.new( hash[:future_queue] ), hash[:future_id] ).respond do
          self.send hash[:method].to_sym, hash[:payload]
        end
      end

    end

  end
end