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.

 

LIKE | SHARE | SUBSCRIBE

WeCanCode-Author

WeCanCode-Author

November 14, 2021

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

Planning to learn ReactJS or Angular or Flutter.!

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.

 

LIKE | SHARE | SUBSCRIBE

WeCanCode-Author

WeCanCode-Author

November 11, 2021

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

Planning to learn ReactJS or Angular or Flutter.!

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.

 

LIKE | SHARE | SUBSCRIBE

WeCanCode-Author

WeCanCode-Author

November 07, 2021

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

Planning to learn ReactJS or Angular or Flutter.!

Add Image to Android app

Add Image to Android app

by | Oct 22, 2021 | 3 Minutes : Tutorials, General, How-To, Learn, ProTip

Add PNG Icon to Android app

 

In this article, let discuss on

Add PNG Icon to Android app

Let us see how to Add PNG icon to Android App. In the end you your app will use the icon you have added for the android application.

 In this article I’m going to use the existing android project created as part of this article Make WordPress as Android App. This Follow the code repo used  ).

How to Add PNG Icon to Android App?

You can add Image assets by Right click on the location where the image or icon need to be placed.

See below screenshot for the Menu option in Android Studio.

  • After right-click drawable folder, Choose New > Image Assets
  • You need to choose the image or icon from the browse menu under Source Asset section of Foreground Layer Tab.
  • Adjust the Scaling according to the image or icon output.
  • Go to Background Layer tab and adjust the background color or image accordingly.
  • Once done, click Finish (Note: Try to keep the same name as the previous icon file name, if you are replacing the icon)
  • Run the App to see the new Icon changed.
intellij add image asset menu
WeCanCode-Author

WeCanCode-Author

October 22, 2021

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

Planning to learn ReactJS or Angular or Flutter.!

Searching a text in a file using grep

by | Jan 5, 2021 | 3 Minutes : Tutorials, How-To

Here we’re going to searching a text in a file using grep?

Searching a text in a file using grep, this command will be very much handy when searching in multiple files or folders in unix terminal.

grep is one of the powerful command used for searching in files or folder with the search pattern.

Searching for text in file using grep

Lets see how to search for text or string in files or folders using grep command

Command Usage:
grep [options] "search pattern"[regex] [filename/foldername]
Note: use double quotes for your search string
Options : (Below are frequently used options with grep command)
-i Ignores case
-n Print the line number
-c Count of matched pattern (Will not print the search line, rather it just prints the count)
-r Will search folders for matching text.
-v non-matched lines are printed

Try for yourself:

1) Search for any string and print count
hint: use -c
2) Search entire folder for match pattern with , (This is special symbol)
hint: “\,”
3) Search string by ignoring the case and also search for multiple string in a file
hint: use -v and in search string you need to split using | for multiple search string.

Try for yourself and comment it here https://youtu.be/9pUPUEvJop8

practice to keep FAMILIAR with the commands.

Subscribe to our channel for more videos : https://bit.ly/aryanz-youtube

https://youtu.be/9pUPUEvJop8
More 3 Minutes: Tutorials here
Searching a text in a file using grep
~3Minutes: Tutorial

All about Permissions (CHOWN) in Unix – 3Minutes: Tutorial

by | Jan 2, 2021 | 3 Minutes : Tutorials, How-To

Here we’re going to talk all about Permissions (CHOWN) in Unix?

When it comes to access for reading,writing or executing files in unix we need to play around with the permissions! So today we are going to talk all about ownership and permissions (chown).

Ownership and Permissions are important thing in unix, when it comes to files and folders access.

Changing ownership of files and folders using chown in unix - ~3Minutes:... youtu.be/Q3Mm4Lzeiyk via @YouTube #3MinTut #3MinutesTutorial #ShortTechTalk #LearningShort #unix #chown permissions and security #aryanz_co_in #balamtin #blog

Changing ownership for files and folders using CHOWN

Command Usage:
chown user:group filename (Changing ownership for user and group)
chown :group filename (Only to the group)
chown user filename (Only the user)
chown user:group foldername -R (For folders and sub directory use -R)
Note: -R to apply the changes to the sub directories and files within the folder.

owner – User who created the file or folder
group – User belong to the group
(groups example: admin, author, sysadmin, root, local, itadmin) – varies from system to system

Try for yourself:
1) Change both owner and group from root to user1 or user1 to root
hint: chown root:root file1.txt
2) Try to change for folder and its sub content (incl. sub directories)
chown root:aryanz_co_in folder1 -R

Try for yourself and comment it here https://youtu.be/Q3Mm4Lzeiyk

practice to keep FAMILIAR with the commands.

Subscribe to our channel for more videos : https://bit.ly/aryanz-youtube

https://youtu.be/Q3Mm4Lzeiyk
https://youtu.be/Q3Mm4Lzeiyk
More 3 Minutes: Tutorials here
Changing ownership of files and folders using chown in unix - ~3Minutes:... youtu.be/Q3Mm4Lzeiyk via @YouTube #3MinTut #3MinutesTutorial #ShortTechTalk #LearningShort #unix #chown permissions and security #aryanz_co_in #balamtin #blog
~3Minutes: Tutorial

Please disable your adblocker or whitelist this site! We Provide Free content and in return, all we ask is to allow serving Ads.

Pin It on Pinterest