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Slides from Nuts and Bolts of WebSocket at #Devoxx 2014

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Peter Moskovits from Kaazing (@peterm_kaazing) and I gave a university talk at Devoxx 2014 on Nuts and Bolts of WebSocket. The slides are now available at:                       The entire session is recorded and will be made available on parleys.com in the coming weeks/months. The complete script for the demo is available ...

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CallSerially The EDT & InvokeAndBlock (Part 1)

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We last explained some of the concepts behind the EDT in 2008 so its high time we wrote about it again, there is a section about it in the developer guide as well as in the courses on Udemy but since this is the most important thing to understand in Codename One it bares repeating. One of the nice things ...

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The State of REST

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The S in REST stands for State. Unfortunately, state is an overloaded word. In this post I’ll discuss the two different kinds of state that apply to REST APIs. Applications The first type of state is application state, as in Hypermedia As The Engine Of Application State (HATEOAS), the distinguishing feature of the REST architectural style. We must first understand ...

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Someday Is a Lie

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“You don’t have a time machine— you’re living the same twenty-four hours we all are. You can barely make it through your day with all the current things there are to do; when is “someday” finally going to arrive? The answer is, of course, never. Today is it.”  – Andrew J. Mellen, “Unstuff Your Life!” If you’re a software professional, you’ve probably ...

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Independent Contracting: How to Get There

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The concept of self-employment is appealing for many technologists, but the path to getting there isn’t always clear. Independent contractors may cite several attributes of their work that they find preferable to traditional employer/employee relationships. The allure of money is obvious, but independents may also be drawn to project variety, an emphasis on new development over maintaining existing projects, and additional control over work/life balance. Independent contracting has ...

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Akka Notes – Actor Supervision – 8

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Failures are more like a feature among distributed systems. And with Akka’s let it crash fault tolerance model, you could achieve a clear separation between your business logic and your failure handling logic (supervision logic). All with very little effort. It’s pretty amazing. This is the topic of our discussion now. Actor Supervision Imagine a method call stack and the ...

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Spring Rest API with Swagger – Exposing documentation

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Once you create API documentation it is important to make it available to the stakeholders. In ideal case, this published documentation would be flexible enough to account for any last-minute changes and also be easy to distribute (in terms of costs as well as time needed to accomplish this). To make this possible we will make use of what was accomplished ...

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An entity modelling strategy for scaling optimistic locking

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Introduction Application-level repeatable reads are suitable for preventing lost updates in web conversations. Enabling entity-level optimistic locking is fairly easy. You just have to mark one logical-clock property (usually an integer counter) with the JPA @Version annotation and Hibernate takes care of the rest.           The catch Optimistic locking discards all incoming changes that are relative ...

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