Cassandra Case Class Adapters

Maps Case classes to the Cassandra Java Driver using shapeless powered type classes.

Note:

• this is in early development stage
• contains weird hacks and class casts
• not API stable

Thanks a lot to the Shapeless team for their wonderful work.

Add Dependency

Builds are available for Scala 2.11, 2.12 having a dependency to the Cassandra Driver 4.7.2.

Add this to your build.sbt:

libraryDependencies += "net.reactivecore" %% "cassandra-caseclass-adapter" % "0.0.2"

If you use Scala 2.10, you also need (see Shapeless Documentation)

libraryDependencies += compilerPlugin("org.scalamacros" % "paradise" % "2.1.0" cross CrossVersion.full)

Usage

Define a case class

case class Person (
    id: UUID,
    name: String,
    age: Int
  )

Have a cassandra table

  CREATE TABLE persons (
    id UUID,
    name TEXT,
    age INT,
    PRIMARY KEY (id)
  );

And let the Adapter automatically generated

  import net.reactivecore.cca.CassandraCaseClassAdapter

  val adapter = CassandraCaseClassAdapter.make[Person]("persons")
  val session = // open cassandra session
  val person = Person(UUIDs.random(), "John Doe", 42)
  adapter.insert(person, session)
  
  val back: Seq[Person] = adapter.loadAllFromCassandra(session)

Supported

• boiler plate free fromRow, insert, loadAllFromCassandra

Supported Types

• Most fundamental types
• Option
• Set of Primitives and of UDT
• List of Primitives (as Seq) and of UDT
• Primitive UDT handling

Not supported / tested yet

• Map
• Tuples
• Combination of Set/Seq with more than one UDT
• Adding custom types
• Prepared Statements for fast insert

Not planned (yet)

• Query Helpers

Testing

• The unit tests need a Cassandra Instance running on 127.0.0.1
• They will recreate a keyspace called unittest on each single testcase.