Package org.apache.storm.kafka.spout.trident

Class KafkaTridentOpaqueSpoutEmitter<K,V>

java.lang.Object

org.apache.storm.kafka.spout.trident.KafkaTridentOpaqueSpoutEmitter<K,V>

All Implemented Interfaces:

Serializable, IOpaquePartitionedTridentSpout.Emitter<List<Map<String,Object>>,KafkaTridentSpoutTopicPartition,Map<String,Object>>

public class KafkaTridentOpaqueSpoutEmitter<K,V>
extends Object
implements IOpaquePartitionedTridentSpout.Emitter<List<Map<String,Object>>,KafkaTridentSpoutTopicPartition,Map<String,Object>>, Serializable

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
KafkaTridentOpaqueSpoutEmitter(KafkaTridentSpoutEmitter<K,V> emitter)

Method Summary

Modifier and Type	Method	Description
void	close()
Map<String,Object>	emitPartitionBatch(TransactionAttempt tx, TridentCollector collector, KafkaTridentSpoutTopicPartition partition, Map<String,Object> lastPartitionMeta)	Emit a batch of tuples for a partition/transaction.
List<KafkaTridentSpoutTopicPartition>	getOrderedPartitions(List<Map<String,Object>> allPartitionInfo)	Sorts the partition info to produce an ordered list of partition.
List<KafkaTridentSpoutTopicPartition>	getPartitionsForTask(int taskId, int numTasks, List<KafkaTridentSpoutTopicPartition> allPartitionInfoSorted)	Get the partitions assigned to this task.
void	refreshPartitions(List<KafkaTridentSpoutTopicPartition> partitionResponsibilities)	This method is called when this task is responsible for a new set of partitions.

Methods inherited from class java.lang.Object

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

Constructor Details

KafkaTridentOpaqueSpoutEmitter

public KafkaTridentOpaqueSpoutEmitter(KafkaTridentSpoutEmitter<K,V> emitter)

Method Details

emitPartitionBatch

public Map<String,Object> emitPartitionBatch(TransactionAttempt tx,
 TridentCollector collector,
 KafkaTridentSpoutTopicPartition partition,
 Map<String,Object> lastPartitionMeta)

Description copied from interface: IOpaquePartitionedTridentSpout.Emitter

Emit a batch of tuples for a partition/transaction.

Return the metadata describing this batch that will be used as lastPartitionMeta for defining the parameters of the next batch.

Specified by:

emitPartitionBatch in interface IOpaquePartitionedTridentSpout.Emitter<List<Map<String,Object>>,KafkaTridentSpoutTopicPartition,Map<String,Object>>

refreshPartitions

public void refreshPartitions(List<KafkaTridentSpoutTopicPartition> partitionResponsibilities)

Description copied from interface: IOpaquePartitionedTridentSpout.Emitter

This method is called when this task is responsible for a new set of partitions. Should be used to manage things like connections to brokers.

Specified by:

refreshPartitions in interface IOpaquePartitionedTridentSpout.Emitter<List<Map<String,Object>>,KafkaTridentSpoutTopicPartition,Map<String,Object>>

Parameters:

partitionResponsibilities - The partitions assigned to this task

getOrderedPartitions

public List<KafkaTridentSpoutTopicPartition> getOrderedPartitions(List<Map<String,Object>> allPartitionInfo)

Description copied from interface: IOpaquePartitionedTridentSpout.Emitter

Sorts the partition info to produce an ordered list of partition.

Specified by:

getOrderedPartitions in interface IOpaquePartitionedTridentSpout.Emitter<List<Map<String,Object>>,KafkaTridentSpoutTopicPartition,Map<String,Object>>

Parameters:

allPartitionInfo - The partition info for all partitions being processed by all spout tasks

Returns:

The ordered list of partitions being processed by all the tasks. The ordering must be consistent for all tasks.

getPartitionsForTask

public List<KafkaTridentSpoutTopicPartition> getPartitionsForTask(int taskId,
 int numTasks,
 List<KafkaTridentSpoutTopicPartition> allPartitionInfoSorted)

Description copied from interface: IOpaquePartitionedTridentSpout.Emitter

Get the partitions assigned to this task.

Specified by:

getPartitionsForTask in interface IOpaquePartitionedTridentSpout.Emitter<List<Map<String,Object>>,KafkaTridentSpoutTopicPartition,Map<String,Object>>

Parameters:

taskId - The id of this task

numTasks - The number of tasks for this spout

allPartitionInfoSorted - The partition info for all partitions being processed by all spout tasks, sorted according to IOpaquePartitionedTridentSpout.Emitter.getOrderedPartitions(java.lang.Object)

Returns:

The list of partitions that are to be processed by the task with id taskId

close

public void close()

Specified by:

close in interface IOpaquePartitionedTridentSpout.Emitter<List<Map<String,Object>>,KafkaTridentSpoutTopicPartition,Map<String,Object>>