Class: Gearman::Client

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/gearman/client.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Logging

included, #logger

Constructor Details

#initialize(job_servers = nil) ⇒ Client

Create a new client.


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# File 'lib/gearman/client.rb', line 13

def initialize(job_servers=nil)
  @coalesce_connections = {}  # Unique ID => Connection
  @connection_pool = ConnectionPool.new(job_servers)
  @current_task = nil
  @task_create_timeout_sec = 10
end

Instance Attribute Details

#task_create_timeout_secObject

Returns the value of attribute task_create_timeout_sec


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# File 'lib/gearman/client.rb', line 7

def task_create_timeout_sec
  @task_create_timeout_sec
end

Instance Method Details

#do_task(task) ⇒ Object

Perform a single task.


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# File 'lib/gearman/client.rb', line 38

def do_task(task)

  result = nil
  failed = false

  task.on_complete {|v| result = v }
  task.on_fail { failed = true }

  task_set = TaskSet.new(self)
  if task_set.add_task(task)
    task_set.wait_forever
  else
    raise JobQueueError, "Unable to enqueue job."
  end

  failed ? nil : result
end

#handle_response(task, type, data) ⇒ Object


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# File 'lib/gearman/client.rb', line 112

def handle_response(task, type, data)
  case type
    when :work_complete
      handle, message = data.split("\0", 2)
      logger.debug("Received WORK_COMPLETE for #{handle}")
      task.handle_completion(message)
    when :work_exception
      handle, exception = data.split("\0", 2)
      logger.debug("Received WORK_EXCEPTION for #{handle}")
      task.handle_exception(exception)
    when :work_fail
      logger.debug("Received WORK_FAIL for #{handle}")
      requeue = task.handle_failure
      add_task(task) if requeue
    when :work_status
      handle, numerator, denominator = data.split("\0", 3)
      logger.debug("Received WORK_STATUS for #{handle}: #{numerator} / #{denominator}")
      task.handle_status(numerator, denominator)
    when :work_warning
      handle, message = data.split("\0", 2)
      logger.warn "Got WORK_WARNING for #{handle}: '#{message}'"
      task.handle_warning(message)
    when :work_data
      handle, work_data = data.split("\0", 2)
      logger.debug "Got WORK_DATA for #{handle} with #{work_data ? work_data.size : '0'} byte(s) of data"
      task.handle_data(work_data)
    else
      # Not good.
      message = "Got #{type.to_s} from #{connection} but it was not an expected type."
      logger.error message
      raise ProtocolError, message
  end
end

#set_options(opts) ⇒ Object

Set the options


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# File 'lib/gearman/client.rb', line 24

def set_options(opts)
  @connection_pool.with_all_connections do |conn|
    logger.debug "Send options request with #{opts}"
    request = Packet.pack_request("option_req", opts)
    response = conn.send_request(request)
    raise ProtocolError, response[1] if response[0]==:error
  end
end

#submit_job(task, reset_state = false, timeout = nil) ⇒ Object


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# File 'lib/gearman/client.rb', line 56

def submit_job(task, reset_state = false, timeout = nil)
  task.reset_state if reset_state
  req = task.get_submit_packet()
  req_timeout = timeout || task_create_timeout_sec
  # Target the same job manager when submitting jobs
  # with the same unique id so that we can coalesce
  coalesce_key = task.get_uniq_hash

  end_time = if timeout
               Time.now.to_f + timeout
             else
               nil
             end

  begin

    connection = @connection_pool.get_connection(coalesce_key)
    logger.debug "Using #{connection} to submit job"

    type, data = connection.send_request(req, timeout)
    logger.debug "Got #{type.to_s} from #{connection}"

    if type == :job_created

      task.handle_created(data)

      if(!task.background)
        begin
          remaining = if end_time
                        (t = end_time - Time.now.to_f) > 0 ? t : 0
                      else
                        nil
                      end
          type, data = connection.read_response(remaining)
          handle_response(task, type, data)
        end while [:work_status, :work_data, :work_warning].include? type
      end

    else
      # This shouldn't happen
      message = "Received #{type.to_s} when we were expecting JOB_CREATED"
      logger.error message
      raise ProtocolError, message
    end
  rescue NetworkError
    message = "Network error on read from #{hostport} while adding job, marking server bad"
    logger.error message
    raise NetworkError, message
  rescue NoJobServersError
    logger.error "No servers available."
    raise NoJobServersError
  end

  true
end