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Description

Simple integration library which enriches a Cassandra Java Driver Session so you can easily return Scala Futures and Akka Streams.

Install

libraryDependencies += "com.timcharper" %% "cassandra-talks-scala" % "0.6"

Depends on

libraryDependencies := Seq(
  "com.datastax.cassandra" % "cassandra-driver-core" % "2.1.9",
  "com.typesafe.akka" % "akka-stream_2.11" % "2.4.2"
)

Using

cassandra-talks-scala enriches com.datastax.driver.core.Session to contain Scala / Akka compatible methods; instead of executeAsync, run executeFuture or executeStream.

import com.timcharper.cassandra_talks_scala._
// ...
  // Get a Future[ResultSet]
  session.executeFuture("SELECT * FROM my_table")

  // Get a Akka Stream Source of Row.
  session.executeStream("SELECT * FROM my_table")

The executeStream method presently lacks a mechanism to determine the paging options. You can customize the ResultSet on your own by using ResultSetSource directly:

import com.timcharper.cassandra_talks_scala._

ResultSetSource { () =>
  session.executeFuture(statement).flatMap { resultSet =>
    // set paging options here...
    resultSet
  }
}

Streaming backpressure causes the driver to fetch pages from Cassandra more slowly.

Versions

0.6:

  • akka-stream: 2.4.x

0.4:

  • akka-stream: 2.0.x
  • cassandra-drive-core: 2.1.x

0.3:

  • akka-stream: 2.0-M1
  • cassandra-drive-core: 2.1.x