Cassandra

The Cassandra plugin adds support for Apache Cassandra. The class CassandraDAO is a DAO implementation and is responsible for connecting to a Cassandra cluster and storing/retrieving objects (items) to/from it. All operations are carried out using the latest Cassandra Java Driver by DataStax, compatible with Cassandra 3.x.

There are several configuration properties for Cassandra (these go in your para-application.conf file):

property	description
`para.cassandra.hosts`	Comma-separated server hostnames (contact points). Defaults to `localhost`.
`para.cassandra.port`	The server port to connect to. Defaults to `9042`.
`para.cassandra.keyspace`	The keyspace name that Para will use. Default is equal to `para.app_name`.
`para.cassandra.user`	The username with access to the database. Defaults to `""`.
`para.cassandra.password`	The password. Defaults to `""`.
`para.cassandra.replication_factor`	Replication factor for the keyspace. Defaults to `1`.
`para.cassandra.ssl_enabled`	Enables the secure SSL/TLS transport. Defaults to `false`.

The plugin is on Maven Central. Here’s the Maven snippet to include in your pom.xml:

<dependency>
  <groupId>com.erudika</groupId>
  <artifactId>para-dao-cassandra</artifactId>
  <version>{version}</version>
</dependency>

Alternatively you can download the JAR from the “Releases” tab above put it in a lib folder alongside the server JAR file para-x.y.z.jar. Para will look for plugins inside lib and pick up the Cassandra plugin.

Finally, set the config property:

para.dao = "CassandraDAO"

This could be a Java system property or part of a para-application.conf file on the classpath. This tells Para to use the Cassandra Data Access Object (DAO) implementation instead of the default.

See Plugins for more information about how you can create your own plugins.