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

Constructors

Constructor and Description
LeastActiveBalancingPolicy()

Method Summary

Methods

Modifier and Type	Method and Description
HClientPool	createConnection(HClientFactory clientFactory, CassandraHost host, CassandraClientMonitor monitor) 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,
                           CassandraClientMonitor monitor)

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

monitor - the monitor exposing JMX methods

Returns:

a connection pool