Namespace conflicts

A special require syntax can be used to avoid namespace conflicts in cases where top level Cassandra namespace if taken.

Background

Given

a running cassandra cluster with schema:

CREATE KEYSPACE simplex WITH replication = {'class': 'SimpleStrategy', 'replication_factor': 3};
USE simplex;
CREATE TABLE songs (
  id uuid PRIMARY KEY,
  title text,
  album text,
  artist text,
  tags set<text>,
  data blob
);

Require the gem using an alternative method

Given

the following example:

require 'datastax/cassandra'

cluster = DataStax::Cassandra.cluster
session = cluster.connect("simplex")

rows = session.execute("SELECT * FROM songs")

puts "songs contain #{rows.size} rows"

batch   = session.batch do |b|
            b.add("INSERT INTO songs (id, title, album, artist, tags)
                   VALUES (
                      756716f7-2e54-4715-9f00-91dcbea6cf50,
                      'La Petite Tonkinoise',
                      'Bye Bye Blackbird',
                      'Joséphine Baker',
                      {'jazz', '2013'}
                   )")
            b.add("INSERT INTO songs (id, title, album, artist, tags)
                   VALUES (
                      f6071e72-48ec-4fcb-bf3e-379c8a696488,
                      'Die Mösch',
                      'In Gold',
                      'Willi Ostermann',
                      {'kölsch', '1996', 'birds'}
                   )")
            b.add("INSERT INTO songs (id, title, album, artist, tags)
                   VALUES (
                      fbdf82ed-0063-4796-9c7c-a3d4f47b4b25,
                      'Memo From Turner',
                      'Performance',
                      'Mick Jager',
                      {'soundtrack', '1991'}
                   )")
          end

puts "inserting rows in a batch"

session.execute(batch, consistency: :all)
rows = session.execute("SELECT * FROM songs")

puts "songs contain #{rows.size} rows"

When

it is executed

Then

its output should contain:

songs contain 0 rows
inserting rows in a batch
songs contain 3 rows