com.datastax.driver.core.policies

Class Policies

java.lang.Object

com.datastax.driver.core.policies.Policies

public class Policies
extends Object

Policies configured for a Cluster instance.

Constructor Summary

Constructors

Constructor and Description
Policies()
Policies(LoadBalancingPolicy loadBalancingPolicy, ReconnectionPolicy reconnectionPolicy, RetryPolicy retryPolicy, AddressTranslater addressTranslater, SpeculativeExecutionPolicy speculativeExecutionPolicy) Creates a new Policies object using the provided policies.
Policies(LoadBalancingPolicy loadBalancingPolicy, ReconnectionPolicy reconnectionPolicy, RetryPolicy retryPolicy, SpeculativeExecutionPolicy speculativeExecutionPolicy) Creates a new Policies object using the provided policies.

Method Summary

Methods

Modifier and Type	Method and Description
static AddressTranslater	defaultAddressTranslater() The default address translater.
static LoadBalancingPolicy	defaultLoadBalancingPolicy() The default load balancing policy.
static ReconnectionPolicy	defaultReconnectionPolicy() The default reconnection policy.
static RetryPolicy	defaultRetryPolicy() The default retry policy.
static SpeculativeExecutionPolicy	defaultSpeculativeExecutionPolicy() The default speculative retry policy.
AddressTranslater	getAddressTranslater() The address translater in use.
LoadBalancingPolicy	getLoadBalancingPolicy() The load balancing policy in use.
ReconnectionPolicy	getReconnectionPolicy() The reconnection policy in use.
RetryPolicy	getRetryPolicy() The retry policy in use.
SpeculativeExecutionPolicy	getSpeculativeExecutionPolicy() The speculative execution policy in use.

Methods inherited from class java.lang.Object

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

Constructor Detail

Policies

public Policies()

Policies

public Policies(LoadBalancingPolicy loadBalancingPolicy,
        ReconnectionPolicy reconnectionPolicy,
        RetryPolicy retryPolicy,
        SpeculativeExecutionPolicy speculativeExecutionPolicy)

Creates a new Policies object using the provided policies.

This constructor use the default IdentityTranslater.

Parameters:

loadBalancingPolicy - the load balancing policy to use.

reconnectionPolicy - the reconnection policy to use.

retryPolicy - the retry policy to use.

Policies

public Policies(LoadBalancingPolicy loadBalancingPolicy,
        ReconnectionPolicy reconnectionPolicy,
        RetryPolicy retryPolicy,
        AddressTranslater addressTranslater,
        SpeculativeExecutionPolicy speculativeExecutionPolicy)

Creates a new Policies object using the provided policies.

Parameters:

loadBalancingPolicy - the load balancing policy to use.

reconnectionPolicy - the reconnection policy to use.

retryPolicy - the retry policy to use.

addressTranslater - the address translater to use.

Method Detail

defaultLoadBalancingPolicy

public static LoadBalancingPolicy defaultLoadBalancingPolicy()

The default load balancing policy.

The default load balancing policy is DCAwareRoundRobinPolicy with token awareness (so new TokenAwarePolicy(new DCAwareRoundRobinPolicy())).

Note that this policy shuffles the replicas when token awareness is used, see TokenAwarePolicy.TokenAwarePolicy(LoadBalancingPolicy,boolean) for an explanation of the tradeoffs.

Returns:

the default load balancing policy.

defaultReconnectionPolicy

public static ReconnectionPolicy defaultReconnectionPolicy()

The default reconnection policy.

The default reconnection policy is an ExponentialReconnectionPolicy where the base delay is 1 second and the max delay is 10 minutes;

Returns:

the default reconnection policy.

defaultRetryPolicy

public static RetryPolicy defaultRetryPolicy()

The default retry policy.

The default retry policy is DefaultRetryPolicy.

Returns:

the default retry policy.

defaultAddressTranslater

public static AddressTranslater defaultAddressTranslater()

The default address translater.

The default address translater is IdentityTranslater.

Returns:

the default address translater.

defaultSpeculativeExecutionPolicy

public static SpeculativeExecutionPolicy defaultSpeculativeExecutionPolicy()

The default speculative retry policy.

The default speculative retry policy is a NoSpeculativeExecutionPolicy.

Returns:

the default speculative retry policy.

getLoadBalancingPolicy

public LoadBalancingPolicy getLoadBalancingPolicy()

The load balancing policy in use.

The load balancing policy defines how Cassandra hosts are picked for queries.

Returns:

the load balancing policy in use.

getReconnectionPolicy

public ReconnectionPolicy getReconnectionPolicy()

The reconnection policy in use.

The reconnection policy defines how often the driver tries to reconnect to a dead node.

Returns:

the reconnection policy in use.

getRetryPolicy

public RetryPolicy getRetryPolicy()

The retry policy in use.

The retry policy defines in which conditions a query should be automatically retries by the driver.

Returns:

the retry policy in use.

getAddressTranslater

public AddressTranslater getAddressTranslater()

The address translater in use.

Returns:

the address translater in use.

getSpeculativeExecutionPolicy

public SpeculativeExecutionPolicy getSpeculativeExecutionPolicy()

The speculative execution policy in use.

Returns:

the speculative execution policy in use.