GemStone::GemFire::Cache::Generic::IPartitionResolver< TKey, TValue > Interface Template Reference

Inherited by GemStone::GemFire::Cache::Generic::IFixedPartitionResolver< TKey, TValue >.


Detailed Description

template<class TKey, class TValue>
interface GemStone::GemFire::Cache::Generic::IPartitionResolver< TKey, TValue >

Implementers of interface PartitionResolver enable custom partitioning on the PartitionedRegion. 1. The Key class or callback arg can implement PartitionResolver interface to enable custom partitioning OR 2. Configure your own PartitionResolver class in partition attributes (For instance when the Key is a primitive type or String) Implement the appropriate equals - For all implementations, you need to be sure to code the class equals method so it properly verifies equality for the PartitionResolver implementation. This might mean verifying that class names are the same or that the returned routing objects are the same etc.. When you initiate the partitioned region on multiple nodes, GemFire uses the equals method to ensure you are using the same PartitionResolver implementation for all of the nodes for the region. GemFire uses the routing object's hashCode to determine where the data is being managed. Say, for example, you want to colocate all Trades by month and year.The key is implemented by TradeKey class which also implements the PartitionResolver interface. public class TradeKey implements PartitionResolver {
&nbsp &nbsp private String tradeID;
&nbsp &nbsp private Month month ;
&nbsp &nbsp private Year year ;

&nbsp &nbsp public TradingKey(){ }
&nbsp &nbsp public TradingKey(Month month, Year year){
&nbsp &nbsp &nbsp &nbsp this.month = month;
&nbsp &nbsp &nbsp &nbsp this.year = year;
&nbsp &nbsp }
&nbsp &nbsp public Serializable getRoutingObject(EntryOperation key){
&nbsp &nbsp &nbsp &nbsp return this.month + this.year;
&nbsp &nbsp }
}

In the example above, all trade entries with the same month and year are guaranteed to be colocated.

See also:
AttributesFactory.SetPartitionResolver, RegionAttributes.PartitionResolver


Public Member Functions

String^ GetName ()
Object^ GetRoutingObject (EntryEvent< TKey, TValue >^key)

Member Function Documentation

template<class TKey, class TValue>
String ^ GemStone::GemFire::Cache::Generic::IPartitionResolver< TKey, TValue >::GetName (  ) 

Returns the name of the PartitionResolver.

This function does not throw any exception.

Returns:
the name of the PartitionResolver

template<class TKey, class TValue>
Object ^ GemStone::GemFire::Cache::Generic::IPartitionResolver< TKey, TValue >::GetRoutingObject ( EntryEvent< TKey, TValue >^  key  ) 

return object associated with entry event which allows the Partitioned Region to store associated data together.

throws RuntimeException - any exception thrown will terminate the operation and the exception will be passed to the calling thread.

Parameters:
key key the detail of the entry event.


GemFire C++ Cache .NET API Documentation