Devoxx.java

@Inject Service<SocialProvider> providers;

public List<Post> getTimeline() {
    List<Post> timeline = new ArrayList<Post>();
    for (SocialProvider provider : providers) {
        timeline.addAll(provider.getTimeline());
    }
    Collections.sort(timeline, new Comparator<Post>() {
        public int compare(Post post1, Post post2) {
            return post1.timestamp().compare(post2.timestamp());
        }
    });
    return timeline;
}