storm.trident.topology
Class MasterBatchCoordinator

java.lang.Object
  extended by backtype.storm.topology.base.BaseComponent
      extended by backtype.storm.topology.base.BaseRichSpout
          extended by storm.trident.topology.MasterBatchCoordinator
All Implemented Interfaces:
ISpout, IComponent, IRichSpout, java.io.Serializable

public class MasterBatchCoordinator
extends BaseRichSpout

See Also:
Serialized Form

Field Summary
static java.lang.String BATCH_STREAM_ID
           
static java.lang.String COMMIT_STREAM_ID
           
static long INIT_TXID
           
static Logger LOG
           
static java.lang.String SUCCESS_STREAM_ID
           
 
Constructor Summary
MasterBatchCoordinator(java.util.List<java.lang.String> spoutIds, java.util.List<ITridentSpout> spouts)
           
 
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 activate()
          Called when a spout has been activated out of a deactivated mode.
 void close()
          Called when an ISpout is going to be shutdown.
 void deactivate()
          Called when a spout has been deactivated.
 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 final Logger LOG

INIT_TXID

public static final long INIT_TXID
See Also:
Constant Field Values

BATCH_STREAM_ID

public static final java.lang.String BATCH_STREAM_ID
See Also:
Constant Field Values

COMMIT_STREAM_ID

public static final java.lang.String COMMIT_STREAM_ID
See Also:
Constant Field Values

SUCCESS_STREAM_ID

public static final java.lang.String SUCCESS_STREAM_ID
See Also:
Constant Field Values
Constructor Detail

MasterBatchCoordinator

public MasterBatchCoordinator(java.util.List<java.lang.String> spoutIds,
                              java.util.List<ITridentSpout> spouts)
Method Detail

activate

public void activate()
Description copied from interface: ISpout
Called when a spout has been activated out of a deactivated mode. nextTuple will be called on this spout soon. A spout can become activated after having been deactivated when the topology is manipulated using the `storm` client.

Specified by:
activate in interface ISpout
Overrides:
activate in class BaseRichSpout

deactivate

public void deactivate()
Description copied from interface: ISpout
Called when a spout has been deactivated. nextTuple will not be called while a spout is deactivated. The spout may or may not be reactivated in the future.

Specified by:
deactivate in interface ISpout
Overrides:
deactivate in class BaseRichSpout

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:

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
Overrides:
close in class BaseRichSpout

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.


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
Overrides:
ack in class BaseRichSpout

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
Overrides:
fail in class BaseRichSpout

declareOutputFields

public void declareOutputFields(OutputFieldsDeclarer declarer)
Description copied from interface: IComponent
Declare the output schema for all the streams of this topology.

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
Overrides:
getComponentConfiguration in class BaseComponent