Retry-After HTTP header in practice

Retry-After is a lesser known HTTP response header. Let me quote relevant part of RFC 2616 (HTTP 1.1 spec): 14.37…

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Storing months of historical metrics from Hystrix in Graphite

One of the killer-features of Hystrix is a low-latency, data-intensive and beautiful dashboard:              …

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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():      …

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Accessing Meetup’s streaming API with RxNetty

This article will touch upon multiple subjects: reactive programming, HTTP, parsing JSON and integrating with social API. All in one…

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Hazelcast member discovery using Curator and ZooKeeper

At one project I was setting up Hazelcast cluster in a private cloud. Within cluster all nodes must see each…

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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…

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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…

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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…

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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…

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