Class: Karait::Queue

Inherits:
Object
  • Object
show all
Includes:
Karait
Defined in:
lib/queue.rb

Constant Summary collapse

MESSAGES_READ = 
10
NO_OBJECT_FOUND_ERROR = 
'No matching object found'

Instance Method Summary collapse

Constructor Details

#initialize(opts = {}) ⇒ Queue

Returns a new instance of Queue.



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# File 'lib/queue.rb', line 11

def initialize(opts={})
  set_instance_variables opts
  create_mongo_connection
end

Instance Method Details

#delete_messages(messages) ⇒ Object 



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# File 'lib/queue.rb', line 105

def delete_messages(messages)
  ids = []
  messages.each {|message| ids << message._get_id}
  @queue_collection.update(
      {
          '_id' => {
            '$in' => ids
          }
      },
      {
          '$set' => {
              '_meta.expired' => true
          }
      },
      :multi => true,
      :safe => true
  )
end

#read(opts = {}) ⇒ Object 



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# File 'lib/queue.rb', line 35

def read(opts={})
  opts = {
    :messages_read => 10,
    :visibility_timeout => -1.0,
    :routing_key => nil
  }.update(opts)
  
  current_time = Time.new.to_f
  messages = []
  
  query = {
      '_meta.expired' => false,
      '_meta.visible_after' => {
        '$lt' => current_time
      }
  }
  if opts[:routing_key] != nil
    query['_meta.routing_key'] = opts[:routing_key]
  else
    query['_meta.routing_key'] = {
      '$exists' => false
    }
  end
  
  update = false
  if opts[:visibility_timeout] > -1.0
    update = {
        '$set' => {
          '_meta.visible_after' => current_time + opts[:visibility_timeout]
        }
    }
  end
  
  raw_messages = []
  
  if update
    (0..opts[:messages_read]).each do
      begin
        
        raw_message = @queue_collection.find_and_modify(:query => query, :update => update)
        
        if raw_message
          raw_messages << raw_message
        else
          break
        end
      
      rescue Mongo::OperationFailure => operation_failure
        if not  operation_failure.to_s.match(Queue::NO_OBJECT_FOUND_ERROR)
          raise operation_failure
        end
      end
      
    end
  else
    @queue_collection.find(query).limit(opts[:messages_read]).each do |raw_message|
      raw_messages << raw_message
    end
  end
  
  raw_messages.each do |raw_message|
    message = Karait::Message.new(raw_message=raw_message, queue_collection=@queue_collection)
    if not message.expired?
      messages << message
    end
  end
  
  return messages
end

#write(message, opts = {}) ⇒ Object 



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# File 'lib/queue.rb', line 16

def write(message, opts={})
  if message.class == Hash
    message_dict = message
  else
    message_dict = message.to_hash
  end
  
  message_dict[:_meta] = {
    :expire => opts.fetch(:expire, -1.0),
    :timestamp => Time.now().to_f,
    :expired => false,
    :visible_after => -1.0
  }
  
  message_dict[:_meta][:routing_key] = opts.fetch(:routing_key) if opts[:routing_key]
  
  @queue_collection.insert(message_dict, :safe => true)
end