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Aspect Oriented Programming with Spring Boot

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On a previous post I provided a simple example on how to achieve aspect orientation in spring by using a ProxyFactoryBean and implementing the MethodBeforeAdvice interface. On this example we will learn how to achieve aspect orientation by using Spring boot and Aspect4j annotations. Let’s start with our gradle file. group 'com.gkatzioura' version '1.0-SNAPSHOT' apply plugin: 'java' apply plugin: 'idea' ...

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Couchbase XDCR using Docker Swarm, Machine and Compose

Cross Datacenter Replication (XDCR) in Couchbase provides an easy way to replicate data from one cluster to another. The clusters are typically set in geographically diverse data centers. This enables for disaster recovery or to bring data closer to users for faster data access. This blog will show: Setup two data centers using Docker Swarm Run Couchbase containers on each node of Docker Swarm ...

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Cloud Foundry Java Client – Streaming events

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Cloud Foundry Java Client provides Java based bindings for interacting with a running Cloud Foundry instance. One of the neat things about this project is that it has embraced the Reactive Stream based API’s for its method signatures, specifically using the Reactor implementation, this is especially useful when consuming streaming data. In this post I want to demonstrate a specific use case where ...

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Scalable Microservices through Messaging

Microservices are everywhere nowadays, and so is the idea of using service choreography (instead of service orchestration) for microservices interactions. In this article I describe how to set up service choreography using ActiveMQ virtual topics, which also enables scalable event based service interactions. Service Interaction Styles There are two main types of service interaction: synchronous and asynchronous. With synchronous interactions, the service consumer makes a request ...

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Validating JWT with Spring Boot and Spring Security

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For my current project I will have a REST API set up with Spring Boot (most likely running with BoxFuse). To be able to use the API endpoint the application will check that the incoming request has a valid JWT token provided earlier (by an API service that I trust). To implement this functionality I want to make use of ...

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A simple TDD environment in Haskell

I recently implemented the bowling kata in Haskell. In the process, I found out how set up my environment to comfortably do Test Driven Development. Hopefully, others might find this post helpful to begin their journey with the language. I used the following components: Haskell installation: Haskell Platform. This also gives you GHCi which you can use as an interactive ...

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Apache Spark, Cassandra and Game of Thrones

Apache Spark with Cassandra is a powerful combination in data processing pipelines.  In this post, we will build a Scala application with the Spark Cassandra combo and query battle data from Game of Thrones.  Now, we’re not going to make any show predictions!   But, we will show the most aggressive kings as well as kings which were attacked the ...

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Correlated Subqueries are Evil and Slow. Or are They?

A common myth in SQL is the idea that correlated subqueries are evil and slow. For example, this query here: SELECT first_name, last_name, (SELECT count(*) FROM film_actor fa WHERE fa.actor_id = a.actor_id) FROM actor a It “forces” the database engine to run a nested loop of the form (in pseudo code): for (Actor a : actor) { output( a.first_name, a.last_name, ...

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