— Previous article

Turing completeness

Next article —

Google Guava v07 examples

You May Also Like
DDevelopment & Design

Spring Security by example: securing methods

This is a part of a simple Spring Security tutorial:

1. Set up and form authentication
2. User in the backend (getting logged user, authentication, testing)
3. Securing web resources
4. Securing methods
5. OpenID (login via gmail)
6. OAuth2 (login via Facebook)
7. Writing on Facebook wall with Spring Social

Securing web resources is all nice and cool, but in a well designed application it's more natural to secure methods (for example on backend facade or even domain objects). While we may get away with role-based authorization in many intranet business applications, nobody will ever handle assigning roles to users in a public, free to use Internet service. We need authorization based on rules described in our domain.

For example: there is a service AlterStory, that allows cooperative writing of stories, where one user is a director (like a movie director), deciding which chapter proposed by other authors should make it to the final story.

The method for accepting chapters, looks like this:

Read more »
DDevelopment & Design

Enums for scala

Scala has very limited implementation of Enumeration. Enumerated objects can't extends other classes. Partial replacement for it is to use sealed classes. You can do pattern matching on them. When you ommit some possible value you will get compiler wa...