org.gridgain.grid.cache.affinity

Interface GridCacheAffinityFunctionContext

All Known Implementing Classes:

GridCacheAffinityFunctionContextImpl

public interface GridCacheAffinityFunctionContext

Affinity function context. This context is passed to GridCacheAffinityFunction for partition reassignment on every topology change event.

Method Summary

Methods

Modifier and Type	Method and Description
int	backups() Gets number of backups for new assignment.
List<GridNode>	currentTopologySnapshot() Gets current topology snapshot.
long	currentTopologyVersion() Gets current topology version number.
GridDiscoveryEvent	discoveryEvent() Gets discovery event caused topology change.
List<GridNode>	previousAssignment(int part) Gets affinity assignment for given partition on previous topology version.

Method Detail

previousAssignment

@Nullable
List<GridNode> previousAssignment(int part)

Gets affinity assignment for given partition on previous topology version. First node in returned list is a primary node, other nodes are backups.

Parameters:

part - Partition to get previous assignment for.

Returns:

List of nodes assigned to given partition on previous topology version or null if this information is not available.

backups

int backups()

Gets number of backups for new assignment.

Returns:

Number of backups for new assignment.

currentTopologySnapshot

List<GridNode> currentTopologySnapshot()

Gets current topology snapshot. Snapshot will contain only nodes on which particular cache is configured. List of passed nodes is guaranteed to be sorted in a same order on all nodes on which partition assignment is performed.

Returns:

Cache topology snapshot.

currentTopologyVersion

long currentTopologyVersion()

Gets current topology version number.

Returns:

Current topology version number.

discoveryEvent

@Nullable
GridDiscoveryEvent discoveryEvent()

Gets discovery event caused topology change.

Returns:

Discovery event caused latest topology change or null if this information is not available.