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WebSocket and Java

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WebSocket is a cool new(ish) technology that allows real-time, two-way communication between the browser and the server, with almost no overhead. What I want to do here, is to provide a very succint, but sufficient overview of how to start using the technology. So, a few things to start with: a tcp socket connection is opened between the browser and ...

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Applying ForkJoin – from optimal to fast

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JDK 7 is well into the hands of developers by now and most people have heard of ForkJoin, yet not so many have the time or chance in daily work to try it. It caused, and probably still causes a bit of confusion on how is it any different than a normal thread pool.[1] My goal in this article is ...

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Building Distributed Workflow Applications on Amazon with Camel

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Pipeline with SNS-SQS A workflow consist of independent tasks performed in particular sequence determined by dynamic conditions. Very often a workflow represents a business process, for example the order processing steps in a ecommerce store. Amazon Web Services offer various tools for building distributed and scalable workflow applications. One approach for building such an application is to use topics and ...

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Throughput and latency: performance tuning made simple

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Many of our previous topics have measured the behaviour of certain systems in terms of either latency or throughput. As it can be confusing to understand what either of the term actually stands for, I decided to write a post explaining the terms in performance optimization standpoint. Let us start with an example to illustrate the concepts. As we are ...

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Node.js Non-Blocking IO Model

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Now-a-days developers know about Node.js as a server -side javascript execution platform. According to nodejs.org,- “Node.js is a platform built on Chrome’s JavaScript runtime for easily building fast, scalable network applications. Node.js uses an event-driven, non-blocking I/O model that makes it lightweight and efficient, perfect for data-intensive real-time applications that run across distributed devices.” Now node.js opens a new way of performing ...

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Anatomy of a Java Decompiler

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A decompiler, simply put, attempts to reverse the transformation of source code to object code. But there are many interesting complexities—Java source code is structured; bytecode certainly isn’t. Moreover, the transformation isn’t one-to-one: two different Java programs may yield identical bytecode. We need to apply heuristics in order to get a reasonable approximation of the original source. (A Tiny) Bytecode ...

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Listening and Logging Ant Output in Groovy

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In the comments section of my post Executing Ant Build File Targets from Groovy, CRC recently asked, “I’ve used your script and it seems to work but I could’t see any output at the console (I’m calling a echo task in build.xml), why?” This is a great question and one that I feel is better answered in a post than ...

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Hibernate Facts: Always check Criteria API SQL queries

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Criteria API is very useful for dynamically building queries, but that’s the only use case where I’d use it. Whenever you have an UI with N filters that may arrive in any M combinations, it makes sense to have an API to construct queries dynamically, since concatenating strings is always a path I’m running away from. The question is, are ...

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