raihan26 on "Upsert/Read into/from Cassandra database using Datastax API (which is using new Binary protocol)"

I have started working with Cassandra database. I am planning to use Datastax API to upsert/read into/from Cassandra database. I am totally new to this Datastax API (which uses new Binary protocol) and I am not able to find lot of documentations as well which have some proper examples.

CREATE TABLE profile (
id varchar,
account varchar,
advertising varchar,
behavior varchar,
info varchar,
PRIMARY KEY (id)
);

Now below is the Singleton class that I have created for connecting to Cassandra database using Datastax API which uses new Binary protocol-

public class CassandraDatastaxConnection {

private static CassandraDatastaxConnection _instance;
protected static Cluster cluster;
protected static Session session;

public static synchronized CassandraDatastaxConnection getInstance() {
if (_instance == null) {
_instance = new CassandraDatastaxConnection();
}
return _instance;
}

/**
* Creating Cassandra connection using Datastax API
*
*/
private CassandraDatastaxConnection() {

try{
cluster = Cluster.builder().addContactPoint("localhost").build();
session = cluster.connect("my_keyspace");
} catch (NoHostAvailableException e) {
throw new RuntimeException(e);
}
}

public static Cluster getCluster() {
return cluster;
}

public static Session getSession() {
return session;
}
}

**First question-** let me know if I am missing anything in the above singleton class while making connection to Cassandra database using Datastax API which uses new Binary protocol.

**Second question-** Now I am trying to upsert and read data into/from Cassandra database-

These are the methods I have in my DAO's which will use the above Singleton class-

public Map<String, String> getColumnNames(final String userId, final Collection<String> columnNames) {

//I am not sure what I am supposed to do here?
//Given a userId, I need to retrieve those columnNames from the Cassandra database
//And then put it in the map with column name and its value and then finally return the map

Map<String, String> attributes = new ConcurrentHashMap<String, String>();

for(String col : columnNames ) {
attributes.put(col, colValue);
}

return attributes;
}

/**
* Performs an upsert of the specified attributes for the specified id.
*/
public void upsertAttributes(final String userId, final Map<String, String> columnNameAndValue) {

//I am not sure what I am supposed to do here to upsert the data in Cassandra database.
//Given a userId, I need to upsert the columns values into Cassandra database.
//columnNameAndValue is the map which will have column name as the key and corresponding column value as the value.

}

Can anyone help me with this? I am totally new to this Datastax API which is using new Binary protocol so having lot of problem on this.

Thanks for the help.