backtype.storm.drpc
Class DRPCSpout

java.lang.Object
  backtype.storm.drpc.DRPCSpout

All Implemented Interfaces:

ISpout, IComponent, IRichSpout, java.io.Serializable

public class DRPCSpout
extends java.lang.Object
implements IRichSpout

See Also:

Serialized Form

Field Summary

static Logger

LOG

Constructor Summary

DRPCSpout(java.lang.String function)

DRPCSpout(java.lang.String function, ILocalDRPC drpc)

Method Summary

void	ack(java.lang.Object msgId) Storm has determined that the tuple emitted by this spout with the msgId identifier has been fully processed.
void	close() Called when an ISpout is going to be shutdown.
void	declareOutputFields(OutputFieldsDeclarer declarer) Declare the output schema for all the streams of this topology.
void	fail(java.lang.Object msgId) The tuple emitted by this spout with the msgId identifier has failed to be fully processed.
java.util.Map<java.lang.String,java.lang.Object>	getComponentConfiguration() Declare configuration specific to this component.
void	nextTuple() When this method is called, Storm is requesting that the Spout emit tuples to the output collector.
void	open(java.util.Map conf, TopologyContext context, SpoutOutputCollector collector) Called when a task for this component is initialized within a worker on the cluster.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

LOG

public static Logger LOG

Constructor Detail

DRPCSpout

public DRPCSpout(java.lang.String function)

DRPCSpout

public DRPCSpout(java.lang.String function,
                 ILocalDRPC drpc)

Method Detail

open

public void open(java.util.Map conf,
                 TopologyContext context,
                 SpoutOutputCollector collector)

Description copied from interface: ISpout

Called when a task for this component is initialized within a worker on the cluster. It provides the spout with the environment in which the spout executes.

This includes the:

Specified by:

open in interface ISpout

Parameters:

conf - The Storm configuration for this spout. This is the configuration provided to the topology merged in with cluster configuration on this machine.

context - This object can be used to get information about this task's place within the topology, including the task id and component id of this task, input and output information, etc.

collector - The collector is used to emit tuples from this spout. Tuples can be emitted at any time, including the open and close methods. The collector is thread-safe and should be saved as an instance variable of this spout object.

close

public void close()

Description copied from interface: ISpout

Called when an ISpout is going to be shutdown. There is no guarentee that close will be called, because the supervisor kill -9's worker processes on the cluster.

The one context where close is guaranteed to be called is a topology is killed when running Storm in local mode.

Specified by:

close in interface ISpout

nextTuple

public void nextTuple()

Description copied from interface: ISpout

When this method is called, Storm is requesting that the Spout emit tuples to the output collector. This method should be non-blocking, so if the Spout has no tuples to emit, this method should return. nextTuple, ack, and fail are all called in a tight loop in a single thread in the spout task. When there are no tuples to emit, it is courteous to have nextTuple sleep for a short amount of time (like a single millisecond) so as not to waste too much CPU.

Specified by:

nextTuple in interface ISpout

ack

public void ack(java.lang.Object msgId)

Description copied from interface: ISpout

Storm has determined that the tuple emitted by this spout with the msgId identifier has been fully processed. Typically, an implementation of this method will take that message off the queue and prevent it from being replayed.

Specified by:

ack in interface ISpout

fail

public void fail(java.lang.Object msgId)

Description copied from interface: ISpout

The tuple emitted by this spout with the msgId identifier has failed to be fully processed. Typically, an implementation of this method will put that message back on the queue to be replayed at a later time.

Specified by:

fail in interface ISpout

declareOutputFields

public void declareOutputFields(OutputFieldsDeclarer declarer)

Description copied from interface: IComponent

Declare the output schema for all the streams of this topology.

Specified by:

declareOutputFields in interface IComponent

Parameters:

declarer - this is used to declare output stream ids, output fields, and whether or not each output stream is a direct stream

getComponentConfiguration

public java.util.Map<java.lang.String,java.lang.Object> getComponentConfiguration()

Description copied from interface: IComponent

Declare configuration specific to this component. Only a subset of the "topology.*" configs can be overridden. The component configuration can be further overridden when constructing the topology using TopologyBuilder

Specified by:

getComponentConfiguration in interface IComponent