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

Class BlockOnParentShardTask

java.lang.Object

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

All Implemented Interfaces:

ITask, Callable<TaskResult>

public class BlockOnParentShardTask
extends Object
implements ITask

Task to block until processing of all data records in the parent shard(s) is completed. We check if we have checkpoint(s) for the parent shard(s). If a checkpoint for a parent shard is found, we poll and wait until the checkpoint value is SHARD_END (application has checkpointed after processing all records in the shard). If we don't find a checkpoint for the parent shard(s), we assume they have been trimmed and directly proceed with processing data from the shard.

Constructor Summary

Constructors

Constructor and Description
BlockOnParentShardTask(ShardInfo shardInfo, ILeaseManager<KinesisClientLease> leaseManager, long parentShardPollIntervalMillis)

Method Summary

Modifier and Type	Method and Description
TaskResult	call() Perform task logic.
TaskType	getTaskType()

Methods inherited from class java.lang.Object

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

Constructor Detail

BlockOnParentShardTask

public BlockOnParentShardTask(ShardInfo shardInfo,
                              ILeaseManager<KinesisClientLease> leaseManager,
                              long parentShardPollIntervalMillis)

Parameters:

shardInfo - Information about the shard we are working on

leaseManager - Used to fetch the lease and checkpoint info for parent shards

parentShardPollIntervalMillis - Sleep time if the parent shard has not completed processing

Method Detail

call

public TaskResult call()

Description copied from interface: ITask

Perform task logic. E.g. perform set up (e.g. fetch records) and invoke a callback (e.g. processRecords() API).

Specified by:

call in interface ITask

Specified by:

call in interface Callable<TaskResult>

Returns:

TaskResult (captures any exceptions encountered during execution of the task)

getTaskType

public TaskType getTaskType()

Specified by:

getTaskType in interface ITask

Returns:

TaskType