2013-03-28 00:51 UTC

No ConcurrentHashSet? No Problem

The JDK provides several concurrent Set classes, each with their own application, but it does not provide a ConcurrentHashSet. Using the Collections utility class, however, such a structure may be created. ... read more

2013-03-27 23:18 UTC

Using @cache_page With Django's Feeds

When returning a django.contrib.syndication.Feed from a view function, the @cache_page decorator does not seem to work as expected. Briefly inspecting the source of Feed explains why: Feed is not an HttpResponse. Truly, this isn't a bug: it's a documentation (if not comprehension) issue. Because the view function is expected ... read more

2013-03-18 00:53 UTC

The Concurrency Of ConcurrentHashMap

Java's ConcurrentHashMap is an excellent point of study when learning about Java's Memory Model. It employs numerous techniques to provide lock-free reads while still guaranteeing safe publication of objects. This article represents my attempt to take the magic out of the ConcurrentHashMap implementation. ... read more

2013-01-22 02:54 UTC

Escape Analysis & Stack Allocated Objects

In 1999, a paper, Escape Analysis For Java was to appear in the ACM SIGPLAN Conference on Object-Oriented Programming Systems, Languages, and Applications. This paper outlined an algorithm to detect whether an object, O, escaped from the currently executed method, M, or current thread, T. This paper ... read more

2012-01-16 00:15 UTC

A Case Of Leaky State

Leaky state is among the most common artifacts I find in existing applications. It's a symptom of poor encapsulation and/or abstraction and typically tends to unmaintainable code. Such symptoms are typically, but by no means exclusively, seen in an anemic domain model. Controlling state by means of encapsulation and ... read more