PartitionedHashMap.HashFunction

All Known Implementing Classes:

PartitionedHashMap.ConsistentHashFunction

Enclosing class:

PartitionedHashMap<K,V>
```
public static interface PartitionedHashMap.HashFunction<K>
```

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`Address`	`hash(K key, java.util.List<Address> membership)`	Defines a hash function to pick the right node from the list of cluster nodes.

- Method Detail
  - hash
```
Address hash(K key,
             java.util.List<Address> membership)
```
    Defines a hash function to pick the right node from the list of cluster nodes. Ideally, this function uses consistent hashing, so that the same key maps to the same node despite cluster view changes. If a view change causes all keys to hash to different nodes, then PartitionedHashMap will redirect requests to different nodes and this causes unnecessary overhead.
    
    Parameters:
    
    key - The object to be hashed
    
    membership - The membership. This value can be ignored for example if the hash function keeps track of the membership itself, e.g. by registering as a membership listener (PartitionedHashMap.addMembershipListener(org.jgroups.MembershipListener) )
    
    Returns: