Skip to main content

Harsha Codes 💻

Search This Blog

Subscribe to this blog

Follow by Email

Upload files to AWS S3 using Java, Spring Boot, and Angular

amazon amplify angular aws Java s3 spring

Get link
Facebook
Twitter
Pinterest
Email
Other Apps

About me

Get link
Facebook
Twitter
Pinterest
Email
Other Apps

A Software Engineer with more than 5 years of Experience.
Check my links :

https://www.linkedin.com/in/harsha-jayamanna-26996827/
https://github.com/h-hub
https://stackoverflow.com/users/2184946/harshakj89
https://twitter.com/HarshaJayamanna

Email: harsha.kj89[at]gmail[dot]com

Phone : +[65]91658950

Reactions:

Get link
Facebook
Twitter
Pinterest
Email
Other Apps

Comments

Post a Comment

Popular Posts

A Study on Linux Kernel

Kernel is the central or most important part of something. Linux Kernel plays a role which is similar to that. Linux Kernel is the core or the most impotent part of an operating system. Some of the operating systems which have the Linux Kernel as the core are GNU/Linux, Ubuntu Linux, Linux Mint, Arch Linux, Deepin, Fedora, Debian and openSUSE.
Figure 00: Few Linux Distributions
The kernel is the part which loads first when the operating system starts and remains in the protected area of the main memory. Kernel is the hardware abstraction layer. It enables the application layer to connect with the hardware layer and vice versa. Kernel is in charge of memory management, process management, task management, and disk management.

Figure 01: Roll of the Kernel

History In 1960 MIT, Bell Labs, and General Electric Developed an operating system called Multics(Multiplexed Information and Computing Service) for the GE-645 mainframe computers. Multics not only brought many new innovations but also …

AWS Cognito + Spring Complete Example

Amazon Cognito lets you add user sign-up, sign-in, and access control to your web and mobile apps quickly and easily. With Cognito, you don't have to worry about user registration and login. In this example, we will integrate Spring boot with AWS Cognito.
1. Configure AWS Cognito. Login to aws console and navigate to Cognito. https://aws.amazon.com/cognito/.
Create a user pool and configure it. Here I will mention some of the important points which are needed to run the example I have given. Once the pool is created, create an app client.

After that, configure the app client. Note that I have run this app at localhost:8089. Call back and sign out URLs are from the same host and port.

Create a domain that will be used to configure the Spring application later.

2. Creating the Spring boot application. I used the spring boot initializer to create the application. Make sure to add below dependencies when creating the application. 3. Cognito configuration Add the following properties…

A Summarization of Singleton Pattern

Singleton Pattern is where only one instance of a class can be created. It is known that this is one of the simplest pattern available, but There is more to this pattern than meets the eye. UML diagram might be simple, but there is much more to understand in the implementation and usage.

What are the situation where we should use only one object for the whole program. When using thread pools.
For caching.
For dialog boxes.
When using logging.
When using device drivers printers,graphic cards and etc.
Using singleton pattern in above situation would help to avoid issues such as, Inconsistent results
Overuse of resources and etc. One might ask, can't we use a global variable for this? why do we need a design pattern? Singleton Pattern is a time-tested method for ensuring only one object gets created Global variables are created when the application starts, regardless of whether we need it or not. If that objects uses some heavy resources, then the situation get worst. Singleton Pattern is…

Powered by Blogger

Theme images by hdoddema