com.stratio.deep.cql

Class LocalMachineLoadBalancingPolicy

java.lang.Object

com.datastax.driver.core.policies.RoundRobinPolicy

com.stratio.deep.cql.LocalMachineLoadBalancingPolicy

All Implemented Interfaces:

com.datastax.driver.core.Host.StateListener, com.datastax.driver.core.policies.LoadBalancingPolicy

public class LocalMachineLoadBalancingPolicy
extends com.datastax.driver.core.policies.RoundRobinPolicy

Load balancing policy that, unlike round robin, sticks to one host.

Constructor Summary

Constructors

Constructor and Description
LocalMachineLoadBalancingPolicy(InetAddress host)

Method Summary

Methods

Modifier and Type	Method and Description
com.datastax.driver.core.HostDistance	distance(com.datastax.driver.core.Host host) Return the HostDistance for the provided host.
void	init(com.datastax.driver.core.Cluster cluster, Collection<com.datastax.driver.core.Host> hosts)
Iterator<com.datastax.driver.core.Host>	newQueryPlan(String loggedKeyspace, com.datastax.driver.core.Statement statement) Returns the hosts to use for a new query.
void	onAdd(com.datastax.driver.core.Host host)
void	onDown(com.datastax.driver.core.Host host)
void	onRemove(com.datastax.driver.core.Host host)
void	onUp(com.datastax.driver.core.Host host)

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalMachineLoadBalancingPolicy

public LocalMachineLoadBalancingPolicy(InetAddress host)

Method Detail

init

public void init(com.datastax.driver.core.Cluster cluster,
        Collection<com.datastax.driver.core.Host> hosts)

Specified by:

init in interface com.datastax.driver.core.policies.LoadBalancingPolicy

Overrides:

init in class com.datastax.driver.core.policies.RoundRobinPolicy

distance

public com.datastax.driver.core.HostDistance distance(com.datastax.driver.core.Host host)

Return the HostDistance for the provided host.

This policy consider all nodes as local. This is generally the right thing to do in a single datacenter deployment. If you use multiple datacenter, see DCAwareRoundRobinPolicy instead.

Specified by:

distance in interface com.datastax.driver.core.policies.LoadBalancingPolicy

Overrides:

distance in class com.datastax.driver.core.policies.RoundRobinPolicy

Parameters:

host - the host of which to return the distance of.

Returns:

the HostDistance to host.

newQueryPlan

public Iterator<com.datastax.driver.core.Host> newQueryPlan(String loggedKeyspace,
                                                   com.datastax.driver.core.Statement statement)

Returns the hosts to use for a new query.

The returned plan will try each known host of the cluster. Upon each call to this method, the ith host of the plans returned will cycle over all the hosts of the cluster in a round-robin fashion.

Specified by:

newQueryPlan in interface com.datastax.driver.core.policies.LoadBalancingPolicy

Overrides:

newQueryPlan in class com.datastax.driver.core.policies.RoundRobinPolicy

Parameters:

loggedKeyspace - the keyspace currently logged in on for this query.

statement - the query for which to build the plan.

Returns:

a new query plan, i.e. an iterator indicating which host to try first for querying, which one to use as failover, etc...

onUp

public void onUp(com.datastax.driver.core.Host host)

Specified by:

onUp in interface com.datastax.driver.core.Host.StateListener

Overrides:

onUp in class com.datastax.driver.core.policies.RoundRobinPolicy

onDown

public void onDown(com.datastax.driver.core.Host host)

Specified by:

onDown in interface com.datastax.driver.core.Host.StateListener

Overrides:

onDown in class com.datastax.driver.core.policies.RoundRobinPolicy

onAdd

public void onAdd(com.datastax.driver.core.Host host)

Specified by:

onAdd in interface com.datastax.driver.core.Host.StateListener

Overrides:

onAdd in class com.datastax.driver.core.policies.RoundRobinPolicy

onRemove

public void onRemove(com.datastax.driver.core.Host host)

Specified by:

onRemove in interface com.datastax.driver.core.Host.StateListener

Overrides:

onRemove in class com.datastax.driver.core.policies.RoundRobinPolicy