Reading Time: 2 minutes In this blog, I will show you how to handle error responses from a Lagom service and convert them into well-defined exceptions using exception serializers. Suppose we have an unmanaged service in Lagom. The unmanaged service hits a target service and the success response is deserialized into a POJO corresponding to the service call. But in the case of an error response, we get deserialization Continue Reading
Reading Time: 3 minutes Here in this blog, we will be discussing how we can query the lagom’s microservices for retrieving data. I hope you are clear with persistent entity concepts in Lagom , if not, you can take a quick overview by going through this blog. Lagom handles data persistence by using ‘Persistent Entity’ which holds the state of individual entities, but to interact with them one must Continue Reading
Reading Time: 2 minutes So here’s the situation: We are using Lagom framework to develop our micro-services and we need to consume data from other services. What should we do? Well, it’s not going to be a problem for us. Lagom provides very easy way to consume a service. The very first way to consume a service is to use the unmanagedServices parameter provided in Lagom plugin. To understand Continue Reading
Reading Time: 4 minutes Let’s first have some basic understanding of Apache Ignite and then we will look more into its life cycle with the help of a demo application. Apache Ignite is an in-memory computing platform that is durable strongly consistent and highly available with powerful SQL, key value and processing APIs. Features : Durable Memory : Apache Ignite is based on the Durable Memory architecture that allows Continue Reading
Reading Time: 5 minutes Are you finding it difficult to understand lagom persistence? Don’t worry because help is right here. In this blog, we will learn about lagom persistence with the help of a simple application and also discuss its theoretical aspects. Before we begin, make sure you know about Event Sourcing and CQRS. You can read about it in details from this link . Choosing a database When Continue Reading
Reading Time: 4 minutes Let’s first understand the basic difference between unit testing and component testing and then we will have a look at a practical application of unmanaged service in lagom with its test cases. Difference between Unit Testing and Component Testing Unit Testing involves testing of individual units(classes) to demonstrate that the program executes as per the specification and it validates the design and technical quality of Continue Reading
Reading Time: 4 minutes What is Lagom? Lagom is not in disguise anymore. Everyone who’s following on micro-service architecture knows about Lagom framework. Lagom is an open source framework built with the shifting from monoliths to micro-services-driven application architecture in mind. It abstracts the complexity of building, running and monitoring micro-services driven applications. The Lagom framework includes Java and Scala APIs to simplify development of microservices. Lagom helps us Continue Reading
Reading Time: 2 minutes In our previous blog we have seen how to deploy the lagom service on conductr – https://blog.knoldus.com/2017/05/25/deploying-the-lagom-service-on-conductr/ In this blog we will create script to deploy your Lagom service on conduct present or running on top of DCOS. There are two types of automatic deployments can be done – Deploying from scratch (stop the current Lagom bundle and deploy the new one) Rolling/Incremental Deployment( Overriding Continue Reading
Reading Time: 3 minutes In previous post we introduced you all with our new hero Micro Services but now let’s create our first application. Light Bend Inc. created Lagom framework for creating reactive micro services. Its really easy to build micro services applications using Lagom framework because of reduced boiler plate task and code. Architecture overview of Lagom Application, our application is basically divided into 2 components application-api Continue Reading
Reading Time: 2 minutes Micro-services architecture is being widely adopted and guess what, Lagom is the most efficient way to achieve it. While creating micro-services, we usually need to interact with other micro-services and consume their data. So the idea behind this blog is to guide you through the steps needed to integrate an unmanaged service. Apparently, Integrating an external API in Lagom is challenging at first but it Continue Reading
Reading Time: 5 minutes When our service depends on a third party service’s end point for response, it is possible that due to various reasons, that may vary from bad connection to an internal server error from the third party, our own service fails. A circuit breaker is employed to prevent cascading failures in our services if such scenarios were to occur. And if you are here, you are Continue Reading
Reading Time: 2 minutes JUST THE RIGHT AMOUNT Lagom- [lah-gome], a swedish word meaning ‘Sufficient’ or ‘Just the right amount’. The meaning of the name ‘Microservice’ is misunderstood by a majority of people. Taking it litrelly Micro = very small i.e. very small service is not the underlying meaning or agenda of creating Microservices. The real theme here does not revolves around the ‘size’ criteria. What really matters here is the Continue Reading
Reading Time: 3 minutes Day one, we were super excited to start a new project for a huge financial institution. They seemed to know the domain and as Knoldus we understood the technology. The stakeholders were excited about the Reactive Paradigm and the client architects were all stoked up the way there would be microservices which would allow them all the benefits that other companies had been harping about. Continue Reading
