Connection pooling in Couchbase SDK (spymemcached)

tgrall · June 25, 2013, 6:51am

Hello,

Couchbase SDKs are thread safe and for Java and .Net, you can use without developing your own pool.

In Java, just create a singleton that initialize the connection to the cluster at startup then get the connection whenever you need it.

You can take a look to the BeerSample Application :
See the ServletContextListener:

github.com

couchbaselabs/beersample-java/blob/master/src/main/java/com/couchbase/beersample/ConnectionManager.java#L62


 * The Logger to use.
 */
private static final Logger logger = Logger.getLogger(
  ConnectionManager.class.getName());


private DesignDocument getDesignDocument(String name) {
  try {
      return client.getDesignDoc(name);
  } catch (com.couchbase.client.protocol.views.InvalidViewException e) {
      return new DesignDocument(name);
  }
}


/**
 * Connect to Couchbase when the Server starts.
 *
 * @param sce the ServletContextEvent (not used here).
 */
@Override
public void contextInitialized(ServletContextEvent sce) {
  String cluster = System.getProperty("com.couchbase.beersample.cluster", "http://127.0.0.1:8091/pools");

And how to get a connection for example in a servlet:

github.com

couchbaselabs/beersample-java/blob/master/src/main/java/com/couchbase/beersample/BreweryServlet.java#L58


*
* The BreweryServlet is used to handle all HTTP queries under the /breweries
* namespace. The "web.xml" defines a wildcard route for every /breweries/*
* route, so the doGet() method needs to determine what should be dispatched.
*/
public class BreweryServlet extends HttpServlet {


 /**
  * Obtains the current CouchbaseClient connection.
  */
 final CouchbaseClient client = ConnectionManager.getInstance();


 /**
  * Google GSON is used for JSON encoding/decoding.
  */
 final Gson gson = new Gson();


 /**
  * Dispatch all incoming GET HTTP requests.
  *
  * Since the /breweries/* routes are wildcarded and will all end up here, the

Regards