Cloudant Sample

This sample shows how to store data with Cloudant using CDI and MicroProfile Config, as well as data validation with Jakarta Bean Validation.

Environment Set Up

To run this sample, first download or clone this repo - to clone:

git clone [email protected]:OpenLiberty/sample-cloudant.git

Setup CouchDb

The Cloudant client is also compatible with CouchDb, which is needed for running the sample locally. If you have Docker installed, you can use the following:

docker run -d --name liberty_cloudant -p 5984:5984 -e COUCHDB_USER=admin -e COUCHDB_PASSWORD=password couchdb:3.4.2

Running the Sample

From inside the sample-cloudant directory, build and start the application in Open Liberty with the following command:

./mvnw liberty:dev

Once the server has started, the application is available at http://localhost:9080

Try it out

Give the sample a try by registering a crew member. Enter a name (a String), an ID Number (an Integer), and select a Rank from the menu, then click 'Register Crew Member'. Two more boxes will appear, one with your crew members (which you can click to remove) and one showing how your data looks in Cloudant.

Stop CouchDb

docker stop liberty_cloudant

How it works

This application uses a CDI producer (CloudantProducer.java) to inject a Cloudant client. It provides access to the database in a RESTful manner in CrewService.java using the /db/crew endpoint.

Calling POST /{id} on the endpoint uses Jakarta Validation to validate the data received from the front end. CrewMember.java shows the constraints as well as the messages we return to the user if those constraints aren't met.

@NotEmpty(message = "All crew members must have a name!")
private String name;
@Pattern(regexp = "(Captain|Officer|Engineer)",  message = "Crew member must be one of the listed ranks!")
private String rank;
@Pattern(regexp = "^\\d+$", message = "ID Number must be a non-negative integer!")
private String crewID;

After validation, we use the injected CouchDatabase to insert a new document with the crew member's information:

Document newCrewMember = new Document();
             newCrewMember.put("Name",crewMember.getName());
             newCrewMember.put("Rank",crewMember.getRank());
             newCrewMember.put("CrewID",crewMember.getCrewID());
             PostDocumentOptions createDocumentOptions =
                    new PostDocumentOptions.Builder()
                        .db(dbname)
                        .document(newCrewMember)
                        .build();
             DocumentResult createDocumentResponse = client
                    .postDocument(createDocumentOptions)
                    .execute()
                    .getResult();

Calling DELETE /{id} on the endpoint deletes a document corresponding to the path parameter {id}

DocumentResult deleteDocumentResponse = client
                .deleteDocument(deleteDocumentOptions)
                .execute()
                .getResult();

Calling GET on the endpoint retrieves the data and does some formatting for the front end.

 AllDocsResult response = client.postAllDocs(docsOptions).execute().getResult();
 for (DocsResultRow d : response.getRows()) {
                sb.append(d.getDoc().toString());
            }