Package org.apache.polygene.entitystore.cassandra

Casssandra EntityStore.

See: Description

Interface Summary

Interface	Description
CassandraCluster
CassandraEntityStoreConfiguration
CassandraEntityStoreService	Cassandra EntityStore service.
CassandraMigration
ClusterBuilder

Class Summary

Class	Description
CassandraCluster.Mixin
CassandraEntityStoreMixin	MongoDB implementation of MapEntityStore.
ClusterBuilder.DefaultBuilder

Package org.apache.polygene.entitystore.cassandra Description

Casssandra EntityStore.

Polygene's Cassandra Keyspace

The Cassandra EntityStore can either use an existing Cassandra Keyspace, which is the default, OR create its own keyspace.

The CassandraEntityStoreConfiguration#keyspaceName() defines the name of the keyspace to use, or to be created. If not defined, then the default name is "polygene".

The CassandraEntityStoreConfiguration#createIfMissing() defines if new missing resources should be created or an Exception should be thrown if missing.

If it is created, then the CassandraEntityStoreConfiguration#replicationFactor() will define the replication factor, and the command to create the keyspace is;

        CREATE KEYSPACE <keyspaceName> WITH replication = {'class':'SimpleStrategy', 'replication_factor' : <replicationFactor> };
    

Polygene's Cassandra Table

Polygene will store all entities in a single Cassandra TABLE

        CREATE TABLE <tableName> (
            id text,
            version text,
            appversion text,
            storeversion text,
            usecase text,
            modified timestamp,
            properties map<string,string>
            assocs map<string,string>
            manyassocs map<string,string>
            namedassocs map<string,string>
            PRIMARY KEY ( id )
        );