com.hazelcast.core

Interface PartitionAware<T>

Type Parameters:

T - key type

All Known Implementing Classes:

PartitionAwareKey

public interface PartitionAware<T>

PartitionAware mean that data will be based in the same member based on partition key and implementing tasks will be executed on the getPartitionKey()'s owner member.

This achieves data affinity. Data or execution occurs on the same partition.

In Hazelcast, disparate data structures will be stored on the same partition, simply based on partition key. So for example if "Steve" was used, then the following would be on one partition:

• a customers IMap with an entry of key "Steve
• an orders IMap using a customer key type implementing PartitionAware with key "Steve
• any queue named "Steve"
• any PartitionAware object with partition key "Steve

So if you had a IExecutorService which needed to deal with a customer and a customer's orders, optimal performance will be achieved by putting them on the same partition.

DistributedObject also has a notion of partition key which is of type String. So to ensure the same partition as distributed Objects Strings should be used for the partition key.

See Also:

DistributedObject

Method Summary

Methods

Modifier and Type	Method and Description
T	getPartitionKey() The key that will be used by Hazelcast to specify the partition.

Method Detail

getPartitionKey

T getPartitionKey()

The key that will be used by Hazelcast to specify the partition. You should give the same key for objects that you want be in the same partition.

Returns:

partition key