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# Class AffinityFunctionContext

Affinity function context.

##### Inheritance

System.Object
AffinityFunctionContext

###### Namespace: Apache.Ignite.Core.Cache.Affinity

###### Assembly: Apache.Ignite.Core.dll

##### Syntax

    public class AffinityFunctionContext : object

### Properties

#### Backups

Gets number of backups for new assignment.

##### Declaration

    public int Backups { get; }

##### Property Value

Type | Description
--- | ---
System.Int32 |

#### CurrentTopologySnapshot

Gets the current topology snapshot. Snapshot will contain only nodes on which the 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.

##### Declaration

    public ICollection<IClusterNode> CurrentTopologySnapshot { get; }

##### Property Value

Type | Description
--- | ---
ICollection<IClusterNode> |

#### CurrentTopologyVersion

Gets the current topology version.

##### Declaration

    public AffinityTopologyVersion CurrentTopologyVersion { get; }

##### Property Value

Type | Description
--- | ---
AffinityTopologyVersion |

#### DiscoveryEvent

Gets the discovery event that caused the topology change.

##### Declaration

    public DiscoveryEvent DiscoveryEvent { get; }

##### Property Value

Type | Description
--- | ---
DiscoveryEvent |

### Methods

#### GetPreviousAssignment(Int32)

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

##### Declaration

    public ICollection<IClusterNode> GetPreviousAssignment(int partition)

##### Parameters

Type | Name | Description
--- | --- | ---
System.Int32 | partition | The partition to get previous assignment for.

##### Returns

Type | Description
--- | ---
ICollection<IClusterNode> | List of nodes assigned to a given partition on previous topology version or
    null
if this information is not available.