About Tomasz Nurkiewicz

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

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ExecutorService – 10 tips and tricks

ExecutorService abstraction has been around since Java 5. We are talking about 2004 here. Just a quick reminder: both Java 5 and 6 are no longer supported, Java 7 won’t be in ...
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Batching (collapsing) requests in Hystrix

Hystrix has an advanced feature of collapsing (or batching) requests. If two or more commands run similar request at the same time, Hystrix can combine them together, run one batched ...
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Property-based testing with ScalaCheck – custom generators

One of the core data structures provided by Hazelcast is IMap<K, V> extending java.util.concurrent.ConcurrentMap – which is basically a distributed map, often used as cache. ...
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Hazelcast’s MapLoader pitfalls

One of the core data structures provided by Hazelcast is IMap<K, V> extendingjava.util.concurrent.ConcurrentMap – which is basically a distributed map, often used as cache. ...
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Property-based testing with Spock

Property based testing is an alternative approach to testing, complementing example based testing. The latter is what we’ve been doing all our lives: exercising production code ...
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URL shortener service in 42 lines of code in… Java (?!) Spring Boot + Redis

Apparently writing a URL shortener service is the new “Hello, world!” in the IoT/microservice/era world. It all started with A URL shortener service in 45 lines of Scala ...
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Testing code for excessively large inputs

When writing unit tests we mostly focus on business correctness. We do our best to exercise happy path and all edge cases. We sometimes microbenchmark and measure throughput. But one ...
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Grouping, sampling and batching – custom collectors in Java 8

Continuing first article, this time we will write some more useful custom collectors: for grouping by given criteria, sampling input, batching and sliding over with fixed size window. Grouping ...
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Building extremely large in-memory InputStream for testing purposes

For some reason I needed extremely large, possibly even infinite InputStream that would simply return the samebyte[] over and over. This way I could produce insanely big stream of ...
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Introduction to writing custom collectors in Java 8

Java 8 introduced the concept of collectors. Most of the time we barely use factory methods from Collectors class, e.g. collect(toList()), toSet() or maybe something more fancy ...
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