Package org.apache.ignite.internal.processors.cache.affinity

Class GridCacheAffinityImpl<K,V>

java.lang.Object

org.apache.ignite.internal.processors.cache.affinity.GridCacheAffinityImpl<K,V>

All Implemented Interfaces:

Affinity<K>

public class GridCacheAffinityImpl<K,V>
extends Object
implements Affinity<K>

Affinity interface implementation.

Field Summary

Fields

Modifier and Type	Field	Description
static String	FAILED_TO_FIND_CACHE_ERR_MSG

Constructor Summary

Constructors

Constructor	Description
GridCacheAffinityImpl(GridCacheContext<K,V> cctx)

Method Summary

Modifier and Type	Method	Description
Object	affinityKey(K key)	Maps passed in key to a key which will be used for node affinity.
int[]	allPartitions(ClusterNode n)	Gets partition ids for which given cluster node has any ownership (either primary or backup).
int[]	backupPartitions(ClusterNode n)	Gets partition ids for which given cluster node has backup ownership.
boolean	isBackup(ClusterNode n, K key)	Returns true if local node is one of the backup nodes for given key.
boolean	isPrimary(ClusterNode n, K key)	Returns true if given node is the primary node for given key.
boolean	isPrimaryOrBackup(ClusterNode n, K key)	Returns true if local node is primary or one of the backup nodes
Map<ClusterNode,Collection<K>>	mapKeysToNodes(@Nullable Collection<? extends K> keys)	This method provides ability to detect which keys are mapped to which nodes.
@Nullable ClusterNode	mapKeyToNode(K key)	This method provides ability to detect to which primary node the given key is mapped.
Collection<ClusterNode>	mapKeyToPrimaryAndBackups(K key)	Gets primary and backup nodes for the key.
Map<Integer,ClusterNode>	mapPartitionsToNodes(Collection<Integer> parts)	Gets primary nodes for the given partitions.
ClusterNode	mapPartitionToNode(int part)	Gets primary node for the given partition.
Collection<ClusterNode>	mapPartitionToPrimaryAndBackups(int part)	Gets primary and backup nodes for partition.
int	partition(K key)	Gets partition id for the given key.
int	partitions()	Gets number of partitions in cache according to configured affinity function.
int[]	primaryPartitions(ClusterNode n)	Gets partition ids for which the given cluster node has primary ownership.

Methods inherited from class java.lang.Object

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

Field Detail

FAILED_TO_FIND_CACHE_ERR_MSG

public static final String FAILED_TO_FIND_CACHE_ERR_MSG

See Also:

Constant Field Values

Constructor Detail

GridCacheAffinityImpl

public GridCacheAffinityImpl(GridCacheContext<K,V> cctx)

Parameters:

cctx - Context.

Method Detail

partitions

public int partitions()

Gets number of partitions in cache according to configured affinity function.

Specified by:

partitions in interface Affinity<K>

Returns:

Number of cache partitions.

See Also:

AffinityFunction, CacheConfiguration.getAffinity(), CacheConfiguration.setAffinity(AffinityFunction)

partition

public int partition(K key)

Gets partition id for the given key.

Specified by:

partition in interface Affinity<K>

Parameters:

key - Key to get partition id for.

Returns:

Partition id.

See Also:

AffinityFunction, CacheConfiguration.getAffinity(), CacheConfiguration.setAffinity(AffinityFunction)

isPrimary

public boolean isPrimary(ClusterNode n,
                         K key)

Returns true if given node is the primary node for given key.

Specified by:

isPrimary in interface Affinity<K>

Parameters:

n - Node to check.

key - Key to check.

Returns:

True if local node is the primary node for given key.

isBackup

public boolean isBackup(ClusterNode n,
                        K key)

Returns true if local node is one of the backup nodes for given key.

Specified by:

isBackup in interface Affinity<K>

Parameters:

n - Node to check.

key - Key to check.

Returns:

True if local node is one of the backup nodes for given key.

isPrimaryOrBackup

public boolean isPrimaryOrBackup(ClusterNode n,
                                 K key)

Returns true if local node is primary or one of the backup nodes

This method is essentially equivalent to calling "Affinity.isPrimary(ClusterNode, Object) || Affinity.isBackup(ClusterNode, Object))", however it is more efficient as it makes both checks at once.

Specified by:

isPrimaryOrBackup in interface Affinity<K>

Parameters:

n - Node to check.

key - Key to check.

Returns:

True if local node is primary or backup for given key.

primaryPartitions

public int[] primaryPartitions(ClusterNode n)

Gets partition ids for which the given cluster node has primary ownership.

Specified by:

primaryPartitions in interface Affinity<K>

Parameters:

n - Cluster node.

Returns:

Partition ids for which given cluster node has primary ownership.

See Also:

AffinityFunction, CacheConfiguration.getAffinity(), CacheConfiguration.setAffinity(AffinityFunction)

backupPartitions

public int[] backupPartitions(ClusterNode n)

Gets partition ids for which given cluster node has backup ownership.

Specified by:

backupPartitions in interface Affinity<K>

Parameters:

n - Cluster node.

Returns:

Partition ids for which given cluster node has backup ownership.

See Also:

AffinityFunction, CacheConfiguration.getAffinity(), CacheConfiguration.setAffinity(AffinityFunction)

allPartitions

public int[] allPartitions(ClusterNode n)

Gets partition ids for which given cluster node has any ownership (either primary or backup).

Specified by:

allPartitions in interface Affinity<K>

Parameters:

n - Cluster node.

Returns:

Partition ids for which given cluster node has any ownership, primary or backup.

See Also:

AffinityFunction, CacheConfiguration.getAffinity(), CacheConfiguration.setAffinity(AffinityFunction)

mapPartitionToNode

public ClusterNode mapPartitionToNode(int part)

Gets primary node for the given partition.

Specified by:

mapPartitionToNode in interface Affinity<K>

Parameters:

part - Partition id.

Returns:

Primary node for the given partition.

See Also:

AffinityFunction, CacheConfiguration.getAffinity(), CacheConfiguration.setAffinity(AffinityFunction)

mapPartitionsToNodes

public Map<Integer,ClusterNode> mapPartitionsToNodes(Collection<Integer> parts)

Gets primary nodes for the given partitions.

Specified by:

mapPartitionsToNodes in interface Affinity<K>

Parameters:

parts - Partition ids.

Returns:

Mapping of given partitions to their primary nodes.

See Also:

AffinityFunction, CacheConfiguration.getAffinity(), CacheConfiguration.setAffinity(AffinityFunction)

affinityKey

public Object affinityKey(K key)

Maps passed in key to a key which will be used for node affinity. The affinity key may be different from actual key if some field in the actual key was designated for affinity mapping via AffinityKeyMapped annotation or if a custom AffinityKeyMapper was configured.

Specified by:

affinityKey in interface Affinity<K>

Parameters:

key - Key to map.

Returns:

Key to be used for node-to-affinity mapping (may be the same key as passed in).

mapKeyToNode

@Nullable
public @Nullable ClusterNode mapKeyToNode(K key)

This method provides ability to detect to which primary node the given key is mapped. Use it to determine which nodes are storing which keys prior to sending jobs that access these keys.

This method works as following:

• For local caches it returns only local node ID.
• For other caches, primary node for the given key is returned.

Specified by:

mapKeyToNode in interface Affinity<K>

Parameters:

key - Keys to map to a node.

Returns:

Primary node for the key.

mapKeysToNodes

public Map<ClusterNode,Collection<K>> mapKeysToNodes(@Nullable
                                                           @Nullable Collection<? extends K> keys)

This method provides ability to detect which keys are mapped to which nodes. Use it to determine which nodes are storing which keys prior to sending jobs that access these keys.

This method works as following:

• For local caches it returns only local node mapped to all keys.
• For other caches, the returned map represents node-to-key affinity.

Specified by:

mapKeysToNodes in interface Affinity<K>

Parameters:

keys - Keys to map to nodes.

Returns:

Map of nodes to keys.

mapKeyToPrimaryAndBackups

public Collection<ClusterNode> mapKeyToPrimaryAndBackups(K key)

Gets primary and backup nodes for the key. Note that primary node is always first in the returned collection.

Specified by:

mapKeyToPrimaryAndBackups in interface Affinity<K>

Parameters:

key - Key to get affinity nodes for.

Returns:

Collection of primary and backup nodes for the key with primary node always first.

mapPartitionToPrimaryAndBackups

public Collection<ClusterNode> mapPartitionToPrimaryAndBackups(int part)

Gets primary and backup nodes for partition. Note that primary node is always first in the returned collection.

Specified by:

mapPartitionToPrimaryAndBackups in interface Affinity<K>

Parameters:

part - Partition to get affinity nodes for.

Returns:

Collection of primary and backup nodes for partition with primary node always first.