Home » Tag Archives: Concurrency (page 6)

Tag Archives: Concurrency

Improving lock performance in Java

Plumbr is the only solution that automatically detects the root causes of Java performance issues by interpreting application performance data. After we introduced locked thread detection to Plumbr couple of months ago, we have started to receive queries similar to “hey, great, now I understand what is causing my performance issues, but what I am supposed to do now?” We ...

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Asynchronous timeouts with CompletableFuture

One day I was rewriting poorly implemented multi-threaded code that was blocking at some point on Future.get():                   public void serve() throws InterruptedException, ExecutionException, TimeoutException { final Future<Response> responseFuture = asyncCode(); final Response response = responseFuture.get(1, SECONDS); send(response); } private void send(Response response) { //... } This was actually an Akka application ...

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Playing With Java Concurrency

Recently I needed to transform some filet that each has a list (array) of objects in JSON format to files that each has separated lines of the same data (objects). It was a one time task and simple one. I did the reading and writing using some feature of Java nio. I used GSON in the simplest way. One thread ...

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Thread local storage in Java

One of the rarely known features among developers is Thread-local storage.  The idea is simple and need for it comes in  scenarios where we need data that is … well local for the thread. If we have two threads we that refer to the same global variable but we wanna them to have separate value independently initialized of each other. ...

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Converting between Completablefuture and Observable

CompletableFuture<T> from Java 8 is an advanced abstraction over a promise that value of type T will be available in the future. Observable<T> is quite similar, but it promises arbitrary number of items in the future, from 0 to infinity. These two representations of asynchronous results are quite similar to the point where Observable with just one item can be ...

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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 half a year. The reason I’m bringing this up is that many Java programmers still don’t fully understand how ExecutorService works. There are many places to learn that, ...

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Multithreading and Concurrency Interview Questions and Answers – The ULTIMATE List (PDF Download)

EDITORIAL NOTE: Concurrency is always a challenge for developers and writing concurrent programs can be extremely hard. There is a number of things that could potentially blow up and the complexity of systems rises considerably when concurrency is introduced. However, the ability to write robust concurrent programs is a great tool in a developer’s belt and can help build sophisticated, ...

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Beyond Thread Pools: Java Concurrency is Not as Bad as You Think

Apache Hadoop, Apache Spark, Akka, Java 8 streams and Quasar: The classic use cases to the newest concurrency approaches for Java developers There’s a lot of chatter going around about newer concepts in concurrency, yet many developers haven’t had a chance to wrap their heads around them yet. In this post we’ll go through the things you need to know about ...

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