me.prettyprint.cassandra.connection
Class LeastActiveBalancingPolicy

java.lang.Object
  me.prettyprint.cassandra.connection.LeastActiveBalancingPolicy

All Implemented Interfaces:

Serializable, LoadBalancingPolicy

public class LeastActiveBalancingPolicy
extends Object
implements LoadBalancingPolicy

Selects the least active host based on the number of active connections. The list of hosts is shuffled on each pass to account for the case where a number of hosts are at the minimum number of connections (ie. they are not busy).

Author:

zznate

See Also:

Serialized Form

Constructor Summary

LeastActiveBalancingPolicy()

Method Summary

HClientPool	createConnection(HClientFactory clientFactory, CassandraHost host) Creates a connection pool for host.
HClientPool	getPool(Collection<HClientPool> pools, Set<CassandraHost> excludeHosts) Retrieves a pool from the collection of pools excluding excludeHosts.

Methods inherited from class java.lang.Object

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

Constructor Detail

LeastActiveBalancingPolicy

public LeastActiveBalancingPolicy()

Method Detail

getPool

public HClientPool getPool(Collection<HClientPool> pools,
                           Set<CassandraHost> excludeHosts)

Description copied from interface: LoadBalancingPolicy

Retrieves a pool from the collection of pools excluding excludeHosts.

Specified by:

getPool in interface LoadBalancingPolicy

Parameters:

pools - collection of all available pools

excludeHosts - excluded pools

Returns:

a pool based on this load balancing policy

createConnection

public HClientPool createConnection(HClientFactory clientFactory,
                                    CassandraHost host)

Description copied from interface: LoadBalancingPolicy

Creates a connection pool for host.

Specified by:

createConnection in interface LoadBalancingPolicy

Parameters:

clientFactory - an instance of HClientFactory

host - an instance of CassandraHost representing the host this pool will represent

Returns:

a connection pool