Hi,
I have a question concerning the Cassandra DataStax Java Driver in
combination with Java EE and EJBs.
I have implemented a Rest Service API based on Java EE8. In my
application I have for example a jax-rs rest resource to write data into
cassandra cluster. My first approach was to create in each method call
1. a new Casssandra Cluster and Session object,
2. write my data into cassandra
3. and finally close the session and the cluster object.
This works but it takes a lot of time (2-3 seconds) until the cluster
object / session is opened for each request.
So my second approach is now a @Singleton EJB providing the session
object for my jax-rs resources. My service implementation to hold the
Session object looks something like this:
*@Singleton*
*public class* ClusterService {
private Cluster cluster;
private Session session;
@PostConstruct
*private void* init() throws ArchiveException {
cluster=initCluster();
session = initArchiveSession();
}
@PreDestroy
*private* void tearDown() throws ArchiveException {
// close session and cluster object
if (session != null) {
session.close();
}
if (cluster != null) {
cluster.close();
}
}
*public* Session getSession() {
if (session==null) {
try {
init();
} catch (ArchiveException e) {
logger.warning("unable to get falid session: " +
e.getMessage());
e.printStackTrace();
}
}
*return* session;
}
.....
}
And my rest service calls now looking like this:
@Path("/archive")
@Stateless
*public class* ArchiveRestService {
@EJB
ClusterService clusterService;
@POST
@Consumes({ MediaType.APPLICATION_XML, MediaType.TEXT_XML })
*public* Response postData(XMLDocument xmlDocument) {
Session session = clusterService.getSession();
session.execute(....);
...
}
...
}
The result is now a super-fast behavior!Seems to be clear because my
rest service no longer need to open a new session for each request.
My question is: Is this approach with a @Singleton ClusterService EJB
valid or is there something I should avoid?
As far as I can see this works pretty fine and is really fast. I am
running the application on a Wildfly 15 server which is Java EE8.
Thanks for your comments
Ralph
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