Home » Author Archives: Tomasz Nurkiewicz (page 9)

Author Archives: Tomasz Nurkiewicz

Java EE developer, Scala enthusiast. Enjoying data analysis and visualization. Strongly believes in the power of testing and automation.

Standalone web application with executable Tomcat

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When it comes to deploying your application, simplicity is the biggest advantage. You’ll understand that especially when project evolves and needs some changes in the environment. Packaging up your whole application in one, standalone and self-sufficient JAR seems like a good idea, especially compared to installing and upgrading Tomcat in target environment. In the past I would typically include Tomcat ...

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Parallelization of a simple use case explained

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Some time ago a friend of mine asked me about the possibilities of speeding up the following process: they are generating some data in two stages, reading from a database and processing the results. Reading takes approximately 70% of time and processing takes the remaining 30%. Unfortunately they cannot simply load the whole data into memory, thus they split reading ...

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Non-blocking I/O – discovering Akka

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Here comes the time to follow some good practices when implementing actors. One of the most important rules we should follow is avoiding any blocking input/output operations, polling, busy waiting, sleeping, etc. Simply put, actor while handling a message should only depend on CPU and if it doesn’t need CPU cycles it should immediately return from receive and let other ...

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Two actors – discovering Akka

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Hope you are having fun so far, but our application has serious performance defect. After measuring response times of the RandomOrgRandom class we developed in the previous part we will notice something really disturbing (the chart represents response times of subsequent invocations in milliseconds): In turns out that regularly response time (time to return one random number) is greater by ...

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Remote actors – discovering Akka

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Assume our test application became a huge success and slowly a single server is not capable of handling growing traffic. We are faced with two choices: replacing our server with a better one (scaling up) or buying a second one and building a cluster (scaling out). We’ve chosen to build a cluster as it’s easier to scale in the future. ...

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become/unbecome – discovering Akka

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Sometimes our actor needs to react differently based on its internal state. Typically receiving some specific message causes the state transition which, in turns, changes the way subsequent messages should be handled. Another message restores the original state and thus – the way messages were handled before. In the previous article we implemented RandomOrgBuffer actor based on waitingForResponse flag. It ...

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Request and response – discovering Akka

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In the previous part we implemented our first actor and sent message to it. Unfortunately actor was incapable of returning any result of processing this message, which rendered him rather useless. In this episode we will learn how to send reply message to the sender and how to integrate synchronous, blocking API with (by definition) asynchronous system based on message ...

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Your first message – discovering Akka

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Akka is a platform (framework?) inspired by Erlang, promising easier development of scalable, multi-threaded and safe applications. While in most of the popular languages concurrency is based on memory shared between several threads, guarded by various synchronization mehods, Akka offers concurrency model based on actors. Actor is a lightweight object which you can interact with barely by sending messages to ...

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Java features applicability

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Java language and standard library is powerful, but with great power comes great responsibility. After seeing a lot of user code misusing or abusing rare Java features on one hand and completely forgetting about most basic feature on the other, I decided to compose this summary. This is not a list of requirements and areas every Java developer should explore, know and ...

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Java Coding Conventions considered harmful

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There is an official Code Conventions for the Java Programming Language guide published on Oracle site. You would expect this 20+ pages document to be the most complete, comprehensive and authoritative source of good practices, hints and tips with regards to the Java language. But once you start to read it, disappointment followed by frustration and anger increases. I would ...

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