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package org.glassfish.jersey.examples.managedbeans.resources;
import javax.ws.rs.DELETE;
import javax.ws.rs.GET;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.UriInfo;
import javax.annotation.ManagedBean;
import javax.annotation.Resource;
import javax.inject.Singleton;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.PersistenceUnit;
/**
* JAX-RS root resource treated as Java EE managed bean in singleton scope.
*
* @author Paul Sandoz
* @author Jakub Podlesak (jakub.podlesak at oracle.com)
*/
@Path("/managedbean/singleton")
@Singleton
@ManagedBean
public class ManagedBeanSingletonResource {
/**
* Initial value should get injected by Java EE container.
*/
@Resource(name = "injectedResource")
int counter = 0;
@Context
UriInfo ui;
private EntityManager entityManager;
/**
* Set entity manager based on injected entity manager factory.
*
* @param em entity manager factory injected by Java EE container.
*/
@PersistenceUnit(unitName = "ManagedBeansPU")
void setEntityManager(final EntityManagerFactory em) {
entityManager = em.createEntityManager();
}
/**
* Provide textual representation of the internal counter.
* @return internal counter {@code String} representation
*/
@GET
@Produces("text/plain")
public String getMessage() {
return Integer.toString(counter++);
}
/**
* Reset internal counter.
* @param i new counter value to be set.
*/
@PUT
@Produces("text/plain")
public void putMessage(final int i) {
counter = i;
}
/**
* Throw a runtime exception, so that it could be mapped.
*
* @return nothing, just throw the custom exception.
*/
@Path("exception")
public String getException() {
throw new ManagedBeanException();
}
/**
* Get JPA widget value.
*
* @param id widget id.
* @return value of the widget or 404 if given widget id is not found.
*/
@Path("widget/{id: \\d+}")
@GET
public String getWidget(@PathParam("id") final int id) {
try {
return entityManager.find(Widget.class, id).val;
} catch (final NullPointerException ignored) {
throw new WebApplicationException(Response.Status.NOT_FOUND);
}
}
/**
* Set new widget value.
* @param id widget id.
* @param val new value to be associated with above specified id.
*/
@Path("widget/{id: \\d+}")
@PUT
public void putWidget(@PathParam("id") final int id, final String val) {
entityManager.merge(new Widget(id, val));
}
/**
* Remove widget with given id.
* @param id id of the widget to be removed.
*/
@Path("widget/{id: \\d+}")
@DELETE
public void deleteWidget(@PathParam("id") final int id) {
entityManager.remove(entityManager.find(Widget.class, id));
}
}