Package com.arpnetworking.clusteraggregator.partitioning

Class InMemoryPartitionSet

java.lang.Object

com.arpnetworking.clusteraggregator.partitioning.InMemoryPartitionSet

All Implemented Interfaces:

PartitionSet

public class InMemoryPartitionSet
extends Object
implements PartitionSet

Simple in-memory partition manager. This class *is not* thread safe.

Author:

Brandon Arp (brandon dot arp at inscopemetrics dot com)

Constructor Summary

Constructors

Constructor	Description
InMemoryPartitionSet(int entriesPerPartition, int maxPartitions)	Public constructor.

Method Summary

Modifier and Type	Method	Description
Optional<Integer>	getExistingPartition(String key)	Will return an existing partition mapping, or Optional.absent if one does not exist.
Optional<Integer>	getOrCreatePartition(String key)	Will return the partition mapping, creating one if possible.

Methods inherited from class java.lang.Object

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

Constructor Details

InMemoryPartitionSet

public InMemoryPartitionSet(int entriesPerPartition,
 int maxPartitions)

Public constructor.

Parameters:

entriesPerPartition - the number of entries per partition

maxPartitions - the maximum number of partitions

Method Details

getExistingPartition

public Optional<Integer> getExistingPartition(String key)

Description copied from interface: PartitionSet

Will return an existing partition mapping, or Optional.absent if one does not exist.

Specified by:

getExistingPartition in interface PartitionSet

Parameters:

key - the key to be partitioned

Returns:

a partition number

getOrCreatePartition

public Optional<Integer> getOrCreatePartition(String key)

Description copied from interface: PartitionSet

Will return the partition mapping, creating one if possible. Will return Optional.absent() if a partition is unable to be created for the key.

Specified by:

getOrCreatePartition in interface PartitionSet

Parameters:

key - the key to be partitioned

Returns:

optionally, a partition number