software.amazon.kinesis.leases.dynamodb

Class DynamoDBLeaseDiscoverer

java.lang.Object

software.amazon.kinesis.leases.dynamodb.DynamoDBLeaseDiscoverer

All Implemented Interfaces:

LeaseDiscoverer

public class DynamoDBLeaseDiscoverer
extends Object
implements LeaseDiscoverer

An implementation of LeaseDiscoverer, it uses LeaseRefresher to query DynamoDBLeaseRefresher.LEASE_OWNER_TO_LEASE_KEY_INDEX_NAME and find the leases assigned to current worker and then filter and returns the leases that have not started processing (looks at LeaseRenewer.getCurrentlyHeldLeases() to find out which leases are currently held leases).

Constructor Summary

Constructors

Constructor and Description
DynamoDBLeaseDiscoverer()

Method Summary

Modifier and Type	Method and Description
List<Lease>	discoverNewLeases() Identifies the leases that are assigned to the current worker but are not being tracked and processed by the current worker.

Methods inherited from class java.lang.Object

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

Constructor Detail

DynamoDBLeaseDiscoverer

public DynamoDBLeaseDiscoverer()

Method Detail

discoverNewLeases

public List<Lease> discoverNewLeases()
                              throws ProvisionedThroughputException,
                                     InvalidStateException,
                                     DependencyException

Description copied from interface: LeaseDiscoverer

Identifies the leases that are assigned to the current worker but are not being tracked and processed by the current worker.

Specified by:

discoverNewLeases in interface LeaseDiscoverer

Returns:

list of leases assigned to worker which doesn't exist in

Throws:

ProvisionedThroughputException - if DynamoDB scan fails due to lack of capacity

InvalidStateException - if lease table does not exist

DependencyException - if DynamoDB scan fails in an unexpected way