About the Author

Neil Stevenson

Neil Stevenson

CTO, Hazelcast Platform

Neil is a solution architect for Hazelcast®, is the industry leading in-memory computing platform. In more than 30 years of work in IT, Neil has designed, developed and debugged a number of software systems for companies large and small.

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Projections, Joins and Partition Awareness

Neil Stevenson
by Neil Stevenson

This example shows some of the newer features of querying, a way that joins can be achieved, and shows the pros and cons of partition aware routing. Although mainly an Hazelcast IMDG example, Hazelcast Jet puts in a guest appearance to implement the join. Background – Partitioning The most commonly used data structure in Hazelcast […]

Priority Queueing Using the SPI

Neil Stevenson
by Neil Stevenson

Hazelcast provides distributed queues, an implementation of java.util.concurrent.BlockingQueue. However, an implementation of java.util.concurrent.PriorityBlockingQueue is not yet provided. In this example, we’ll see how to write this yourself, using Hazelcast’s SPI (Service Provider Interface). (Note: this is just an example, deliberately simplified. Attention is drawn to some extra steps to make this production quality.) Recap, “SPI“ […]

Fraud Detection near-cache example

Neil Stevenson
by Neil Stevenson

An example demonstrating how a near-cache configuration option can be added to an existing application to improve performance. Performance increases, no coding is required. But it’s not a universally applicable solution, there are downsides to be aware of. What is a “near-cache“? Hazelcast provides a number of distributed storage containers, for storing data in the […]

Tricolor: Multiple classloaders, multiple Hazelcasts, multiple loggers and multiple colours — all in the one JVM

Neil Stevenson
by Neil Stevenson

Why? The normal deployment is for a JVM to contain a single Hazelcast instance, a client or a server. This means that the instance can utilise all the resources available to that JVM. In automated tests, it can frequently be useful to run multiple Hazelcast instances in the one JVM so that it is easy […]

Step Away From The Database

Neil Stevenson
by Neil Stevenson

A step-by-step example of how to introduce Hazelcast into an existing database backed application. The example here takes a Spring JPA example and augments this with Spring Data Hazelcast for added speed and resilience, without discarding what is already there. For a developer these are baby steps, but for an architect it’s giant leaps. Hola […]

Spring Boot: Hazelcast for Session Replication

Neil Stevenson
by Neil Stevenson

In an earlier blog post, Caching Made Bootiful: The Hazelcast Way, Hazelcast’s Viktor Gamov demonstrated the ease of doing caching with Hazelcast in Spring. In this post, we’ll continue the theme to show how trivial session clustering is to implement from a coding perspective but also how this can radically change the application architecture for […]

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