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Table Of Content
Use JanusGraph Embedded
Below the necessary steps to setup JanusGraph embedded and accessing it through a spring application
Declare Maven dependencies
Access to Cassandra using open source driver
<dependency> <groupId>com.wba.configurationmanager-library</groupId> <artifactId>cfgmgr-janus-spring</artifactId> <version>3.2-SNAPSHOT</version> </dependency> <!-- THIS ENABLE ACCESS TO CASSANDRA --> <dependency> <groupId>org.janusgraph</groupId> <artifactId>janusgraph-cql</artifactId> <version>0.3.0-20180813</version> <scope>runtime</scope> </dependency>
Access to Cassandra using DSE Driver enabling LDAP access
<dependency> <groupId>com.wba.configurationmanager-library</groupId> <artifactId>cfgmgr-janus-spring</artifactId> <version>3.2-SNAPSHOT</version> </dependency> <!-- THIS ENABLE ACCESS TO CASSANDRA --> <dependency> <groupId>org.janusgraph</groupId> <artifactId>janusgraph-cql</artifactId> <version>0.3.0-20180813-</version> <scope>runtime</scope> <exclusions> <exclusion> <groupId>com.datastax.cassandra</groupId> <artifactId>cassandra-driver-core</artifactId> </exclusion> </exclusions> </dependency> <dependency> <groupId>com.datastax.dse</groupId> <artifactId>dse-java-driver-core</artifactId> <version>[1.4.1,)</version> </dependency>
Use in Spring
Create an instance of JANUSGraphLocalSession
@SpringBootApplication public class JanusLocalPocApplication { private static final Logger LOGGER = LoggerFactory.getLogger(JanusLocalPocApplication.class); @Autowired() JANUSGraphLocalSession session; public static void main(String[] args) { SpringApplication.run(JanusLocalPocApplication.class, args); } @PostConstruct void init() { // Use graph traversal LOGGER.debug( "number of vertex(s): {}", session.G().V().count().next() ); } }
Configure spring application
In the application properties we have to set the URL of Janus configuration file
janus.config.url=classpath:janus-cql.properties
Janus Graph configuration for accessing to Cassandra
# # file: janus-cql.properties # gremlin.graph=org.janusgraph.core.JanusGraphFactory storage.backend=cql # storage.backend=inmemory // useful for test storage.cql.keyspace=_keyspace_ storage.cql.read-consistency-level=LOCAL_QUORUM storage.cql.write-consistency-level=LOCAL_QUORUM storage.hostname=_cassandra_host_ storage.username=_username_ storage.password=_password_