Just about every modern software developer has a copy of the Gang of Four "Design Patterns" book sitting on a shelf; many of them have actually read it. The dark secret of the patterns community is that there is often a large gulf between whiteboard simplicity and real-world complexity. Language choice plays a part in the design (and even importance) of patterns. The situation is made even more confusing by the fact that many of the core patterns have now been "voted off the island" for one reason or another. This talk will give a pragmatic overview of the motivations behind design patterns and will focus on applying a handful of the GOF patterns to example scenarios in Java, Ruby and C#. A quick introduction to the role AOP plays in changing the patterns landscape will also be covered.

Attendees will learn about
The benefits and history of patterns in software
How language choice affects pattern implementations
Applying a handful of GOF patterns in code examples
Why there is no DP4J available

Rating: Intermediate
Category: Architecture/Languages, Core Java, .NET
Prerequisites: Basic Java or C# skills

Service-oriented architectures (SOAs) are all the rage. But how do you find all of these services once they are deployed? Configuration files are so 90's. Software of the 21st Century should be able to find related services and components without users having to specify particular configurations at start up. The IETF's ZeroConf multicast DNS protocol was designed to solve exactly this problem. JmDNS is Java-based open source implementation of this capability that allows local-link applications to find and use automagically discovered capabilities. Apple's Rendezvous technology is another open-source ZeroConf implementation behind many of the exciting applications it is building for OS X these days. Come learn how you can interact with these or your own service discovery-savvy applications without even having to learn how to spell UDDI. Bring your wireless notebooks to participate in a service-oriented environment (please have a working Java environment as we won't have time to debug installation issues).

Attendees will learn - Why you don't need UDDI to find services
- The basics of multicast DNS and the ZeroConf protocol
- How to take advantage of Bonjour-enabled devices and software - How to build their own applications that can be found without a central repository Rating: Advanced Category: Client or Server-side Java Prerequisites: Basic to Intermediate Java skills, basic networking knowledge

Just as the world is feeling comfortable with the Web, Tim Berners-Lee et al inform us that what we have seen so far is just the beginning. His original plans at CERN were larger and grander. The Semantic Web is the new vision of machine-processable documents and metadata to improve search, knowledge discovery and data integration and management. While there are many naysayers chiding such grand visions, there are also pragmatic and useful technologies emerging that can be applied today.

Attendees will learn:

The history and motivations behind the Semantic Web The technology stack that will make it happen (including RDF and OWL) An overview of tools and technologies that are beginning to satisfy the vision

This talk stands on its own, but feeds into the "Experiencing the Semantic Web" talk which is more hands on.

Rating: Intermediate
Prerequisites: This is all so new, most engineers will find something to excite them.