Authentication with Java driver

[Yuji Ito]

Hi all,

I want to know how to authenticate Cassandra users for multiple instances
with Java driver.
For instance, each thread creates a instance to access Cassandra with
authentication.

As the implementation example, only the first constructor builds a cluster
and a session.
Other constructors use them.
This example is implemented according to the datastax document: "Basically
you will want to share the same cluster and session instances across your
application".
http://www.datastax.com/dev/blog/4-simple-rules-when-using-the-datastax-drivers-for-cassandra

However, other constructors don't authenticate the user and the password.
That's because they don't need to build a cluster and a session.

So, should I create a cluster and a session per instance for the
authentication?
If yes, can I create a lot of instances(clusters and sessions) to access C*
concurrently?

== example ==
public class A {
  private static Cluster cluster = null;
  private static Map<String, Session> sessions = null;
  private Session session;

  public A (String keyspace, String user, String password) {
    if (cluster == null) {
        builder = Cluster.builder();
        ...
        builder = builder.withCredentials(user, password);
        cluster = builder.build();
    }
    session = sessions.get(keyspace);
    if (session == null) {
        session = cluster.connection(keyspace);
        sessions.put(keyspace, session)
    }
    ...
  }
  ...
  public ResultSet update(...) {
  ...
  public ResultSet get(...) {
  ...
}
== example ==

Thanks,
Yuji