Class: DbRole

Inherits:
Role
  • Object
show all
Includes:
Server
Defined in:
lib/db_role.rb

Constant Summary collapse

PORT = 
9200

Constants inherited from Role

Role::INDEX

Instance Method Summary collapse

Methods included from Server

#run_server, #shutdown_server

Methods inherited from Role

#disable_link, #enable_link, get_role, #init_links, role

Constructor Details

#initialize(manifest) ⇒ DbRole

Returns a new instance of DbRole.



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# File 'lib/db_role.rb', line 13

def initialize(manifest)
  super
  @queues = Hash.new { |h,k| h[k] = [] }
  init_links 'slaves', @manifest['slaves'] do |event,addr|
    case event
    when 'enable'
      @queues[addr].each { |msg|
        begin
          slave_sock = DemoSocket.connect(addr, PORT)
          slave_sock.send msg
          slave_sock.recv
        rescue Errno::ECONNREFUSED, Errno::ECONNABORTED
        end
      }
    end
  end

  @data = {
    'lorem' => { :value => 'ipsum', :updated => Time.now.to_i },
    'augue' => { :value => 'porta', :updated => Time.now.to_i },
    'congue' => { :value => 'turpis', :updated => Time.now.to_i },
    'vitae' => { :value => 'consequat', :updated => Time.now.to_i },
    'accumsan' => { :value => 'nascetur', :updated => Time.now.to_i },
    'diam' => { :value => 'dolor', :updated => Time.now.to_i },
    'parturient' => { :value => 'viverra', :updated => Time.now.to_i },
  }
end

Instance Method Details

#start ⇒ Object Also known as: enable 



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# File 'lib/db_role.rb', line 41

def start
  @slave_sockets = {}

  semaphore = Mutex.new

  run_server '0.0.0.0', PORT.to_s do |sock|
    msg = sock.recv

    reply = nil
    semaphore.synchronize {
      case msg['cmd']
      when 'GET'
        record = @data[msg['key']]
        reply = {
          'key' => msg['key'],
          'value' => record[:value],
          'updated' => record[:updated]
        }
      when 'PUT'
        msg['updated'] ||= Time.now.to_i

        @data[msg['key']] = { :value => msg['value'], :updated => msg['updated'] }

        @active_links['slaves'].each do |slave_addr|
          begin
            slave_sock = DemoSocket.connect(slave_addr, PORT)
            slave_sock.send msg
            slave_sock.recv
          rescue Errno::ECONNREFUSED, Errno::ECONNABORTED
          end
        end

        @disabled_links['slaves'].each do |slave_addr|
          @queues[slave_addr] << msg
        end

        record = @data[msg['key']]
        reply = {
          'key' => msg['key'],
          'value' => record[:value],
          'updated' => record[:updated]
        }
      when 'LIST'
        reply = @data.map { |k,record|
          { 'key' => k,
            'value' => record[:value],
            'updated' => record[:updated] }
        }
      end
    }

    sock.send(reply)
    sock.close
  end
end

#state ⇒ Object 



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# File 'lib/db_role.rb', line 9

def state
  super.merge('extra' => { 'slave' => @manifest['slave'] })
end

#stop ⇒ Object Also known as: disable 



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# File 'lib/db_role.rb', line 97

def stop
  shutdown_server '0.0.0.0', PORT.to_s
  @slave_sockets.each do |addr, socket|
    socket.close
  end
end