The circuit Breaker pattern is another popular design pattern used in Microservices Architecture. This pattern falls under the category of sustainable design patterns. That means it helps to keep a particular service alive without failing. Availability is a crucial factor in Microservices Architecture. Therefore it is important to implement a way to overcome these failures.
Think about the microservices architecture. There are many remote calls between different services in the system. Unlike in-memory calls, these remote calls have a high possibility to fail at a given instance. These failures can occur due to network issues, timeouts, etc. There could also…
Microservices is a completely new way of developing applications. Design patterns are a crucial part of this new implementation process. Let’s discuss some commonly used designed patterns.
Aggregator Pattern
A microservices application consists of several independent services. These services are less coupled and talk to each other through well-defined interfaces. Service has its own database as well. However, there may be instances where we need to write queries to get results from multiple databases which are in different services. We can use the Aggregator pattern to implement this.
In the aggregator design pattern, a particular service(service A) will receive the request. Then…
Developers need to follow a set of best practices in order to successfully implement the Microservices architecture. Let’s discuss these best practices.
Design
It is very important to model the boundaries of the system before implementing the Microservices architecture. The developers who design the system must have a crystal clear understanding of the processes and rules in that particular domain. The design should be a Domain-Driven Design.
Domain-driven Design -
Domain-Driven Design is an approach to software development that centers the development on programming a domain model that has a rich understanding of the processes and rules of the domain.
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Monolithic Application Architecture
Monolithic application architecture is the architecture followed by most of the developers to create enterprise-level applications before the emergence of Microservices. In Monolithic applications, all the business modules run in a single process which is typically a WAR/EAR file. Classes of these different modules may talk to each other and they also may use the same libraries. There are many coupling between these modules. Moreover, Monolithic applications typically use a single database containing multiple tables related to all the available business modules. A monolithic application contains 3 main tiers namely the client tier, server tier, and database tier.
Example: Consider…
Evolution of Application Architecture
Generation 01: The Dark Ages
One Physical Server — One Application
Through this article let’s discuss some new concepts in JavaScript. This is a continuation of the previous article. So I suggest you go through part 1 of this article before moving on to this.
Visit the previous article by —
6. Template Literals
Refers to a string literal that allows embedded expressions. Templates literals should be enclosed with ` ` instead of “ ”.
Multi-line Strings using template literals —
Easily write multi-line strings without having to use “\n”
JavaScript is a lightweight, dynamic, text-based programming language that is used on both client-side and server-side in order to make web pages more interactive. Javascript was first introduced in 1995 with the name LiveScript. Later on, with the popularity of Java, Netscape changed its name to JavaScript. JavaScript is the only programming language that is native to the web browser and it's a relatively easy language to learn. Therefore the popularity of Javascript increased rapidly over the past few years. Almost all web Browsers contain a JavaScript Engine. JavaScript Engine is a computer program that is used to execute Javascript…
Memento Pattern is a Design pattern that is used to restore the state of an object to a previous state without revealing the implementation details. This pattern falls under the category of Behavioral design patterns. Think about a situation where we develop an application with states. Now there is a requirement saying that at a particular point, we need to go back to the previous state. A Memento Design pattern can be used to achieve this functionality.
There are 3 main components of the Memento Design Pattern
- Originator: Particular object whose state needs to be maintained. It creates the memento.
- …
Definition
Chain of Responsibility Pattern is a Design pattern that forms sequentially connected components and consumers can simply pass the object to the first component. Then that particular object gets processed by each component according to the constructed sequence.
This pattern falls under the category of behavioral Design patterns. In simple terms, this pattern lets the application pass requests along a chain of handlers. Each handler can decide either to process the request or to pass it to the next handler in the constructed sequence. This pattern is mainly used to introduce loose coupling to the application. …
The builder pattern is all about creating a complex object with the help of several simple objects. This is done in a step-by-step approach. This pattern falls under the category of creational design patterns. In simple terms, this pattern helps to produce different types and representations of an object with the same construction code.
Mostly used in situations where we need to create objects that have many different working parts and they all need to come together to create one single object.
The traditional approach of creating multiple constructors without using the Builder pattern will make the code more complex…
Damsak Bandara
Associate Software Engineer at Virtusa
