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Enhancing the persistence layer for multi-tenency

By Jim Jaquet

Enhancing the persistence layer for multi-tenency


You will learn

In this tutorial you will enhance the persistence layer with a multi-tenancy feature so that each user will be able to store their own favorite list.

Step 1: Add annotations to base object class

First, we’ll add the necessary annotations to the persistence BaseObject class. Open it and add the following two annotations to the class definition:

@TenantDiscriminatorColumn(name = "TENANT_ID", contextProperty="")
public abstract class BaseObject
Adding Java annotations to a Java Class
Step 2: Obtain reference

Next, we need to slightly adjust the way we obtain a reference to the EntityManager within the FavoriteCityService class as we now need to pass the current tenant ID (in our case the user ID). The following code snippet illustrates the concept:

public List<FavoriteCity> getFavoriteCities(@Context SecurityContext ctx)
List<FavoriteCity> retVal = null;

String userName = (ctx.getUserPrincipal() != null) ? ctx.getUserPrincipal().getName() : "anonymous";
Map<String,String> props = new HashMap<String,String>();
props.put("", userName);

EntityManager em = this.getEntityManagerFactory().createEntityManager(props);

retVal = em.createNamedQuery("FavoriteCities").getResultList();

return retVal;
Modifying Java methods to handle the tenant ID
Step 3: Edit methods

Make your changes to the methods (getFavoriteCity(), addFavoriteCity() and removeFavoriteCity() ) in the FavoriteCityService respectively and save all edits.

Modifying Java methods to handle the tenant ID
Step 4: Deploy your changes

Deploy/publish your changes. Please explicitly stop and start the server, as you have updated the persistence model!

Next Steps

Updated 12/12/2017

Time to Complete

10 min



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