What is Shared Database Design pattern?

What is Shared Database Design pattern?

by | Nov 14, 2021 | 3 Minutes : Tutorials, Interview, Learn, Microservice

What is Shared Database

Design Pattern

 

Today we will see what is Shared Database Design Pattern is.

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns. also, we saw Asynchronous Messaging Design pattern.


What is Shared Database Design Pattern?

For every web service application, there is a massive amount of data present. So when the application is broken down from monolithic to microservice, It is necessary that each application have a sufficient amount of data to process the request.

So, we can have a database for each service or it can have a shared database.

Yes, we can use a database per service or shared database to solve many problems.

Below are a few of the problems,

  • Data duplication and inconsistency
  • Different application has different storage requirements and different infrastructure.
  • Few transactions can query the data with multiple services.
  • De-normalization of data

In order to solve the first 3 problems, we can go for database per service, as it will be accessed by the microservice API itself.

So each web service will have its own databased ID, which the other services do not have direct access to.

📌 Note: Limit the number of databases to 2-3 for the microservices; else, scaling up will be a problem.

What is Shared Database Design Pattern?

Shared Database Design Pattern: Example

Example:

Example1: Partially having a shared database for the microservices.

In the above image, If you see the Contact & Student services shares a database but whereas Fees has its database. (While designing the MSA for the application we can decide about how our application can utilize the database).

Example 2: Partially having a shared database for the microservices.

In the next example, if you see the image, the entire microservices uses the one common shared database. this way the database is one and multiple services use it to persist or read data.

In the next article, we will see Asynchronous Messaging design pattern.

 

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November 14, 2021

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What is Asynchronous Messaging Design Pattern?

What is Asynchronous Messaging Design Pattern?

by | Nov 11, 2021 | 3 Minutes : Tutorials, Interview, Learn, Microservice, Springboot

What is Asynchronous Messaging Design Pattern?

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns. also, we saw an API Gateway design pattern.

Today we will see what is Asynchronous Messaging Design Pattern is.

What is Asynchronous Messaging Design Pattern?

Previously we saw about Chained or Chain of responsibility design pattern which makes the client wait for a long time, It also breaks the chain if any one service goes down and cause a bad experience for the clients.

To avoid such bad experiences for the client, The Asynchronous design pattern can be used, which communicate with the available services using message queue or event driven approach and not sequentially.

Yes, Messaging or events, The Asynchronous design pattern uses the Messaging Queue (MQ) or Event driven like ActiveMQ, RabbitMQ, Kafka and other tools for its communication with other services.

Example:

Consider we have Cart, Product, Stock, Order & Shipping services.

When the Product is added to the Cart, Stock must be updated accordingly, So the Product calls stock via Message Queue.

And then Order calls shipment via Message Queue to prepare a label for shipment.

This way the client need not wait for the flow of service to be completed to get the response immediately.

what is Asynchronous design pattern?

 

In the next article, we will see Shared Database or Shared Data design pattern.

 

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November 11, 2021

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What is Chained or Chain of Responsibility Design Pattern

What is Chained or Chain of Responsibility Design Pattern

by | Nov 7, 2021 | 3 Minutes : Tutorials, Learn, Microservice

What is Chained or Chain of Responsibility Design Pattern

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns. also, we saw an API Gateway design pattern.

Today we will see what is Chained or Chain of Responsibility Design Pattern is.

What is Chained or Chain of Responsibility Design Pattern?

The chained or Chain of responsibility pattern produces a single response which is a combination of multiple chained responses.

Example:

Consider we have Contact, Student & Fees three microservices, each web service communicates with the following or next service as in waterfall.

Yes, Contact service calls Student service and Student service calls Fees service. Response of Fees and Student will be returned back to Contact service.

What is Chained or Chain of Responsibility Design Pattern

Chained Or Chain Of Responsibility Design Pattern in Microservice

Here the Client must wait till the response comes back after the consolidated response is available, meaning the Client will be waiting for the chain of response to be returned back as a response.

Use this service where the client is not expecting any response. (Something like calling a batch job, synchronous tasks or orchestrated flow of actions.

All these services use the HTTP request or response for communicating,

Note: Each service request and response looks different from the chained flow.

 

In the next article, we will see Asynchronous Messaging design pattern.

 

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November 07, 2021

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What is API Gateway Design Pattern?

What is API Gateway Design Pattern?

by | Nov 6, 2021 | Interview, Learn, Microservice, Springboot

What is API Gateway Design Pattern?

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns. also we saw an Aggregator design pattern.

Today we will see what is API Gateway Design Pattern is.

What is API Gateway Design Pattern?

Microservice is built in such a way that each service acts differently on its own. So, when a web application is drilled down into smaller pieces there could be problems we face.

The problems are as follows.

  1. How to get data from various microservices?
  2. A different front-end application is required to manage the same database, just that it uses multiple web services.
  3. How to respond with the data for different consumer to satisfy their requirement. So that we can have reusable microservices.
  4. Handle multiple protocol requests.

Seems the list is small here, but in reality, it is even wider. The solution for these problems is to use the API Gateway design pattern. The API Gateway design pattern addresses many other problems apart from the ones mentioned above. We can also use this design pattern as a proxy service for routing the request.

 API Gateway acts as the entry point for all the endpoints of the microservice, it can help in converting the various protocol request from one type to another. Also, it can disburden the responsibility of authentication/authorization in the microservice.

 So, once the client sends the request, requests are passed through the API gateway which manages the entry point and re-routes the client’s request to the appropriate microservice. Then with the help of the load balancer, it distributes the client’s request to the microservice.

Microservice uses the service discovery which maintains the available microservices and their available entry points to communicate with each other

What is API Gateway Design pattern?

API Gateway Design pattern

 

 

In the next article, we will see Chained or Chain of Responsibility design pattern.

 

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November 06, 2021

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Know Aggregator Microservice Design Pattern

Know Aggregator Microservice Design Pattern

by | Nov 5, 2021 | Interview, Microservice, Program

Aggregator Microservice Design Pattern

Previously we saw about What is Microservice? and the principles followed while developing MSA and the available design patterns.

Know about Microservice Aggregator Design Pattern.

Know Aggregator Microservice Design Pattern

The Aggregator is something that collects related items or data and displays them (combining and merging of data).

In MSA aggregator is a basic web service that internally invokes various services to get the required information that needs to be aggregated and send back to the requestor.

This pattern helps when you have the requirement of collecting data from various different services and merging the collected information.

aggregator microservice

Example:

We have two different services namely Student and Address which has their own database, and we need to gather the data from both the service/database.

Which uses a Unique ID as a reference in both databases, thus allowing us to fetch the data from both databases via the web service endpoint and combine or aggregate them with help of the new service Student’s Address which is the aggregator service.

 

 

In the next article, we will see in API Gateway design pattern.

 

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November 05, 2021

Senior Developer | Java & C#.NET | 10++ years of IT experience.

Planning to learn ReactJS or Angular or Flutter.!

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