@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();
  }
Пример #2
0
 private CacheControl cacheControlNoStore() {
   CacheControl cacheControl = new CacheControl();
   cacheControl.setNoStore(true);
   return cacheControl;
 }