com.amazonaws.services.kinesis.clientlibrary.lib.worker

Class KinesisDataFetcher

java.lang.Object

com.amazonaws.services.kinesis.clientlibrary.lib.worker.KinesisDataFetcher

All Implemented Interfaces:

IDataFetcher

public class KinesisDataFetcher
extends Object
implements IDataFetcher

Used to get data from Amazon Kinesis. Tracks iterator state internally.

Constructor Summary

Constructors

Constructor and Description
KinesisDataFetcher(IKinesisProxy kinesisProxy, ShardInfo shardInfo)

Method Summary

Modifier and Type	Method and Description
void	advanceIteratorTo(String sequenceNumber, InitialPositionInStreamExtended initialPositionInStream) Advances this KinesisDataFetcher's internal iterator to be at the passed-in sequence number.
List<com.amazonaws.services.kinesis.model.ChildShard>	getChildShards()
DataFetcherResult	getRecords(int maxRecords) Get records from the current position in the stream (up to maxRecords).
void	initialize(ExtendedSequenceNumber initialCheckpoint, InitialPositionInStreamExtended initialPositionInStream)
void	initialize(String initialCheckpoint, InitialPositionInStreamExtended initialPositionInStream) Initializes this KinesisDataFetcher's iterator based on the checkpointed sequence number.
boolean	isShardEndReached()
void	restartIterator() Gets a new iterator from the last known sequence number i.e.

Methods inherited from class java.lang.Object

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

Constructor Detail

KinesisDataFetcher

public KinesisDataFetcher(IKinesisProxy kinesisProxy,
                          ShardInfo shardInfo)

Parameters:

kinesisProxy - Kinesis proxy

shardInfo - The shardInfo object.

Method Detail

getRecords

public DataFetcherResult getRecords(int maxRecords)

Get records from the current position in the stream (up to maxRecords).

Specified by:

getRecords in interface IDataFetcher

Parameters:

maxRecords - Max records to fetch

Returns:

list of records of up to maxRecords size

initialize

public void initialize(String initialCheckpoint,
                       InitialPositionInStreamExtended initialPositionInStream)

Initializes this KinesisDataFetcher's iterator based on the checkpointed sequence number.

Specified by:

initialize in interface IDataFetcher

Parameters:

initialCheckpoint - Current checkpoint sequence number for this shard.

initialPositionInStream - The initialPositionInStream.

initialize

public void initialize(ExtendedSequenceNumber initialCheckpoint,
                       InitialPositionInStreamExtended initialPositionInStream)

Specified by:

initialize in interface IDataFetcher

advanceIteratorTo

public void advanceIteratorTo(String sequenceNumber,
                              InitialPositionInStreamExtended initialPositionInStream)

Advances this KinesisDataFetcher's internal iterator to be at the passed-in sequence number.

Specified by:

advanceIteratorTo in interface IDataFetcher

Parameters:

sequenceNumber - advance the iterator to the record at this sequence number.

initialPositionInStream - The initialPositionInStream.

restartIterator

public void restartIterator()

Gets a new iterator from the last known sequence number i.e. the sequence number of the last record from the last getRecords call.

Specified by:

restartIterator in interface IDataFetcher

isShardEndReached

public boolean isShardEndReached()

Specified by:

isShardEndReached in interface IDataFetcher

Returns:

the shardEndReached

getChildShards

public List<com.amazonaws.services.kinesis.model.ChildShard> getChildShards()

Specified by:

getChildShards in interface IDataFetcher