@GET
@Path("/{id}")
public Response get(@PathParam("id") int id, @Context Request request) {
// Create cache control header
CacheControl cc = new CacheControl();
// Set max age to one day
cc.setMaxAge(86400);
Response.ResponseBuilder rb = null;
// Calculate the ETag on last modified date of user resource
EntityTag etag = new EntityTag(UserDao.getLastModifiedById(id).hashCode() + "");
// Verify if it matched with etag available in http request
rb = request.evaluatePreconditions(etag);
// If ETag matches the rb will be non-null;
// Use the rb to return the response without any further processing
if (rb != null) {
return rb.cacheControl(cc).tag(etag).build();
}
// If rb is null then either it is first time request; or resource is modified
// Get the updated representation and return with Etag attached to it
rb = Response.ok(UserDao.get(id).get()).cacheControl(cc).tag(etag);
return rb.build();
}
@PUT
@Path("/{id}")
public Response update(@PathParam("id") int id) {
// Update the User resource
UserDao.update(UserDao.get(id).get());
return Response.status(200).build();
}