Package com.datastax.driver.core

Interface Cluster.Initializer

All Known Implementing Classes:

Cluster.Builder

Enclosing class:

Cluster

public static interface Cluster.Initializer

Initializer for Cluster instances.

If you want to create a new Cluster instance programmatically, then it is advised to use Cluster.Builder which can be obtained from the Cluster.builder() method.

But it is also possible to implement a custom Initializer that retrieves initialization from a web-service or from a configuration file.

Method Summary

Modifier and Type	Method	Description
String	getClusterName()	An optional name for the created cluster.
Configuration	getConfiguration()	The configuration to use for the new cluster.
List<EndPoint>	getContactPoints()	Returns the initial Cassandra hosts to connect to.
Collection<Host.StateListener>	getInitialListeners()	Optional listeners to register against the newly created cluster.

Method Detail

getClusterName

String getClusterName()

An optional name for the created cluster.

Such name is optional (a default name will be created otherwise) and is currently only use for JMX reporting of metrics. See Cluster.getClusterName() for more information.

Returns:

the name for the created cluster or null to use an automatically generated name.

getContactPoints

List<EndPoint> getContactPoints()

Returns the initial Cassandra hosts to connect to.

Returns:

the initial Cassandra contact points. See Cluster.Builder.addContactPoint(java.lang.String) for more details on contact points.

getConfiguration

Configuration getConfiguration()

The configuration to use for the new cluster.

Note that some configuration can be modified after the cluster initialization but some others cannot. In particular, the ones that cannot be changed afterwards includes:

• the port use to connect to Cassandra nodes (see ProtocolOptions).
• the policies used (see Policies).
• the authentication info provided (see Configuration).
• whether metrics are enabled (see Configuration).

Returns:

the configuration to use for the new cluster.

getInitialListeners

Collection<Host.StateListener> getInitialListeners()

Optional listeners to register against the newly created cluster.

Note that contrary to listeners registered post Cluster creation, the listeners returned by this method will see Host.StateListener.onAdd(com.datastax.driver.core.Host) events for the initial contact points.

Returns:

a possibly empty collection of Host.StateListener to register against the newly created cluster.