Microservices or the microservices architecture is basically an architectural style that constructs an application which has a collection of some loosely coupled services, it also executes business capabilities. The microservices architecture allows the continuous delivery or arrangement of some large and complex apps. The microservice architecture also allows an enterprise to develop its technology stack.

The microservice architecture is a typical way of developing software systems that have come in popularity in a few years. Even there is not a whole lot out there regarding what it is and how you can do it, for most of the developers, microservice architecture has become an upgrade way of creating some enterprise apps. 

Thanks to its scalability, because this microservice architectural technique is considered especially ideal when you must allow support for more than one of devices and platforms—Internet of Things, mobile, spanning web, and wearables—or in straightforward term when you don’t know what kind of devices or platforms you will need to support in a growing cloudy future. 

Also, it is not a silver bullet. But microservice architecture has many drawbacks. Furthermore, when you are using this microservice architecture there are many issues that you must face. The microservice architecture design language is a group of patterns which are used to apply the microservice architecture. Basically, it has two goals:

· Its pattern language allows you to decide whether microservices are a perfect fit for your app.

· The pattern language also allows you to use the microservice architecture successfully.

Some Examples of Microservices

As Martin Fowler points out, Amazon, eBay, SoundCloud, SoundCloud, Netflix, Forward, PayPal, the UK Government Digital Service, realestate.com.au, Twitter, Gilt, The Guardian, Blue mix, and most of other apps and large-scale websites have all developed to microservices architecture from monolithic.

The Netflix has a general architecture that has developed from monolithic to SOA. Netflix receives more than one billion calls in a single day, from more than almost eight hundred different types of platforms and devices to its streaming-video API. Each of its API calls, then move around five more calls added to the backend service.

The buy-and-sell site eBay is another example of microservice architecture that has developed through the same transformation. Their core app comprises several independent apps, with each one of them performing the business logic for various functional areas.

The Amazon has also migrated from monolithic to microservices. The Amazon platform gets numberless calls from a variety of apps—including the apps that manage the web service API and the website itself—which would have been normally impossible for the one they are using before, the two-tiered architecture to handle.

Understanding the Microservice Architecture

As you know that there is no fixed definition of the term microservices, there is not any standard model that you will see symbolized in every system which is based on this architectural style. But one thing that you can expect from the most microservice systems is to share some notable characteristics.

The first one, by the definition, is that the software which is developed as microservices can split down into various component services. What’s the reason of it? So that each of these services can be tweaked, utilized, and then again utilized separately without compromising the unity of an app. As a result, you may only have to change one or more definite services instead of doing to again utilize the entire app. But this approach does have its down fall too, including coarser-grained remote APIs, some costed remote calls, and increased complication when you are distributing again the responsibilities between various components.

The Second thing is that the microservices style is often organized around your business priorities and capabilities. Unlike a conventional monolithic development thinking—where different teams are involved and each one has a focus on, databases, UIs, technology layers, say, or server-side logic—it uses some cross-functional teams.  

The third one is that microservices architecture acts somewhat like the classical UNIX system: team collaboration receives several requests, then they process them, and after that, they generate a response with respect to the structure of the request. This is against to how much other collaboration tools like ESBs work, where high-tech systems are used for choreography, message routing, and applying some business rules are deployed. 

Final thoughts

· Microservices are not a silver bullet, and by implementing microservices you can expose teamwork, communication, and some other issues.

· The best way to overcome any issue is planning around backward capability.