Using Datastax Cassandra Driver from Scala

Question

I wanted to explore using the Datastax Cassandra CQL3 driver from scala but think I may have fallen at the first hurdle.

In methods for creating a Cluster object in the Javadoc there is an overloaded method for addContactPoints which take either a sequence of String or a Sequence of java.net.InetAddress as parameters. Is there a way of modelling this in an idiomatic Scala way so I can try and pattern match on the type and arity of an input parameter to call the correct method.

with

import com.datastax.driver.core.Cluster

def cp = Cluster.builder().addContactPoint _

def cps = Cluster.builder().addContactPoints _

cp returns

cp: String => com.datastax.driver.core.Cluster.Builder

cps however gives

error: ambiguous reference to overloaded definition,

both method addContactPoints in class Builder of type (x$1: <repeated...>[java.net.InetAddress])com.datastax.driver.core.Cluster.Builder

and  method addContactPoints in class Builder of type (x$1: <repeated...>[String])com.datastax.driver.core.Cluster.Builder
match expected type ?

Jiri Kremser · Accepted Answer · 2013-06-26 13:31:38Z

4

What about explicitly specifying the type of the function?

import com.datastax.driver.core.Cluster

def cp = Cluster.builder().addContactPoint _
def cps(addresses: [String]) : Cluster.Builder = Cluster.builder().addContactPoints(addresses)

answered Jun 26, 2013 at 13:31

Jiri Kremser

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1 Comment

Gavin Over a year ago

Nearly there - I ended up with def cps(addresses: Seq[String]): Cluster.Builder = Cluster.builder().addContactPoints(addresses:_*)

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