Photo by Trent Erwin on Unsplash Lately I've been fascinated by the idea of domain driven design. Before diving more deeply into it we must understand the concepts that are being used. Entities Each object should be uniquely identified. The entity should contain those attributes that are required in order to uniquely identify the object. For example for… Continue reading Domain driven design concepts
We all know what exceptions are. We have checked and unchecked exceptions in java. Checked exceptions are for recovering. Like reading a file from disk. public class ReadFile { private AtomicInteger retryCount = new AtomicInteger(0); private static final int maxRetries = 3; private static Logger log = getLogger(ReadFile.class.getName()); private String readFromFile(String fileLocation) { StringBuilder resultStringBuilder… Continue reading How many exceptions?
We're all in this because we love to code. The code has no feelings, it is real and quantifiable. We want to write the best code possible, to be proud of it. We follow the principles and realize great things. We refactor it times after times. Then unit and integration tests come along. Static analysis… Continue reading (Bad) Business kills coding
We all know that the shared data in microservices(if they are done right) is eventually consistent. This is due to the CAP theorem which states that availability is usually a better choice than consistency. In a previous post I wrote about having eventual consistency data using Eventuate. Since distributed transactions(2PC) are heavy with a bad… Continue reading Sagas in microservices
I have seen lots of people who are doing code reviews and others who think it's just waste of time or they are not convinced about it. The latter are probably defensive and don't want for others to tell them how good or bad is their code. And most probably they don't write any kind… Continue reading Code review flavors
As we saw in a previous post microservices can communicate with UI clients and with other microservices. We want to achieve low latency and high throughput, so the size of the message definitely makes a difference. But along with the size we need to make sure the message sent by a sender is understood by the… Continue reading Evolution of a message
Now the fun part. Assuming that we have built a running microservice environment, how can we maintain it? How do we introduce changes without breaking it? How do we test it? We know we can do end to end tests, but these are slow and we need faster feedback. How can we test the microservice… Continue reading Testing microservices
