Couchbase Java SDK with Rx-Java

Biju KunjummenSeptember 4th, 2015Last Updated: September 3rd, 2015

0 63 1 minute read

A neat thing about Couchbase Java SDK is that it is built on top of the excellent Rx-Java library, this enables a reactive way to interact with a Couchbase server instance which is very intuitive once you get the hang of it.

Consider a very simple json document that I intend to store in Couchbase:

{"key":"1","value":"one"}

and a Java class to hold this json:

public class KeyVal {
    private String key;
    private String value;

    ...
}

The following is the code to insert an instance of KeyVal to a Couchbase bucket:

JsonObject jsonObject = JsonObject.empty().put("key", keyVal.getKey()).put("value", keyVal.getValue());
JsonDocument doc = JsonDocument.create(keyVal.getKey(), jsonObject);
Observable<JsonDocument> obs = bucket
                .async()
                .insert(doc);

The return type of the insert is an Observable, so if I needed to map the return type back a KeyVal I can use the extensive mapping support provided by Observable class.

Observable<KeyVal> obs = bucket
                .async()
                .insert(doc)
                .map(jsonDoc -> 
                    new KeyVal(jsonDoc.id(), jsonDoc.content().getString("value"))
                );

Other API’s follow a similar pattern, for eg. to retrieve the saved document:

bucket
                .async()
                .get(id)
                .map(doc ->
                        new KeyVal(doc.id(),
                                doc.content().getString("value")));

If you are interested in exploring this sample further, here is my github repo with a working example – https://github.com/bijukunjummen/sample-karyon2-couch

Resources

Couchbase Java SDK: http://docs.couchbase.com/developer/java-2.1/java-intro.html
Rx-Java: https://github.com/ReactiveX/RxJava
An excellent and concise article on Rx-Java provided at the Couchbase site: http://docs.couchbase.com/developer/java-2.0/observables.html

Reference:

Couchbase Java SDK with Rx-Java from our JCG partner Biju Kunjummen at the all and sundry blog.