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December 02, 2015 High-Concurrency HTTP Clients on the JVM By Fabio HTTP is probably the most popular application-level protocol and there are many libraries that implement it on top of network I/O, which is a special (stream-oriented) case of general I/O. Since all I/O has a much in common 1, let’s start with some discussion about it. I’ll concentrate on I/O cases with a lots of concurrent HTTP r

October 08, 2015 Capsule Shield: A Docker Alternative Tailor-Made for the JVM By Fabio, Ron Why Docker Is Not the Best Container Solution for JVM Applications Virtualized containers and container solutions – first among them Docker – are a smash hit. Containers provide a mechanism for isolating applications and controlling their resource usage that is more performant and less wasteful than virtual

May 21, 2015 Quasar and Akka – a Comparison By Fabio The actor model is a design pattern for fault-tolerant and highly scalable systems. Actors are independent worker-modules that communicate with other actors only through message-passing, can fail in isolation from other actors but can monitor other actors for failure and take some recovery measures when that happens. Actors are simple, isolated

May 08, 2014 An Opinionated Guide to Modern Java, Part 2: Deployment, Monitoring & Management, Profiling and Benchmarking By Ron This is part 2 in a three-part series: part 1, part 3 Welcome to part 2 of the OGMJ. In part 1 we presented new Java language features, libraries and tools, that make Java into a much more lightweight development environment: new build tools, easier docs, expressive code

May 01, 2014 Not Your Father's Java: An Opinionated Guide to Modern Java Development, Part 1 By Ron This is part 1 in a three-part series: part 2, part 3 More working, useful code has been written in the Java programming language than in any other in history, with the possible exceptions of C and COBOL. When Java was released almost 20 years ago, it took the software world by storm. It was a simpl

February 20, 2014 Reactive (Dataflow) Programming in Java and Clojure with Quasar and Pulsar By Ron Reactive programming is a programming paradigm that helps programmers process data that flows into the system or is computed by the system asynchronously. Reactive programming achieves this through constructs that organize concurrency into a simple, understandable form. But before we go on to show h

May 02, 2013 Erlang (and Go) in Clojure (and Java) By Ron We’ll start at the end: Quasar and Pulsar are two new open-source libraries in Java and Clojure respectively that add Erlang-like actor-model (and Go-like coroutine/channel) programs to the JVM. There have been several attempts of porting actors to the JVM. Quasar and Pulsar’s main contribution — from which many of their advantages stem — i