As the first part, we need to create a piece of code to be put into our lambda function. I will use Java to create this

Author : snsyt
Publish Date : 2021-01-07 00:47:40


As the first part, we need to create a piece of code to be put into our lambda function. I will use Java to create this

This is where the term serverless comes to the rescue. A serverless application is an application in which the developer doesn’t have to manage any servers! Literally! It is a cloud computing approach in which a third party vendor manages the servers and manages the scaling of the servers dynamically without us having to do anything. There are no operating systems to manage, no effort needs to be given to scale our application and most importantly there is no fixed cost. You pay as you go.

The application layer consists of the business logic of the project. It handles the requests sent by the application layer and converts those requests to a specific domain-related issue and interacts with the Data Layer to give a suitable response to the client request.

With the arrival of winter break, the team hopes more students will have time to rejoin the build and complete the remaining architectural aspects, as well as such fun interactive elements as sledding on campus hills. When Axelrod and Potts graduate in the spring, they’re hopeful that the project will be self-sustaining, with Potts saying that the project will give students the chance to “always be connected to campus [and] connected to Cornell students.”

Here POSTMAN will act as our presentation layer and generate a HTTP request which will be received by the API Gateway and according to our request URL, it will forward the request to the relevant Lambda Function. The lambda function will process the data and provide the gateway with the necessary response.

As you can see, this ‘legacy’ approach consists of too much hassle to be dealt with just to implement our domain logic in the cloud. We will spend more time designing the infrastructure and servers than developing our own business logic which can be a huge loss to a company in the long-term.

The most common and popular way of developing 3-tier applications is using REST APIs. Usually, a front-end application is built with some kind of front-end framework, and to interact with that, a REST API is built along with an attached database. Easy! Right?

But, not so quickly! We have to deploy our application. For that, we need to choose a vendor and set up a server to deploy our application. After some time, the no of users increase and we need to scale up our application, then we got to use some kind of load balancing technology with multiple instances of our server deployed. What happens if one of the servers went down? We have to ensure that there is no single point of failure and need to design the application architecture accordingly.

AWS Lambda is the serverless solution provided by Amazon and is the most widely used serverless technology in the world. Here, a developer can provide a piece of code from a language he desires and create a ‘Lambda Function’. That lambda function can be invoked using a set of triggers we define ourselves. So an external entity can send ‘requests’ to that lambda function and it will run our code which is stored inside the lambda function. If many ‘requests’ come to that certain function AWS will automatically fire up more instances of that same function so that that it can handle the incoming requests parallelly.

A 3 tiered architecture consists of mainly 3 layers. The Presentation Layer, Application Layer, and the Data Layer. Each layer has its own set of responsibilities and uses communication methods to interact with the other layers.

The final layer is the Data Layer which has the responsibility of persisting data and providing the Application Layer with necessary data. This layer consists of some kind of database management system to store the domain-related data.

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idn’t help. He was the type of guy to post a video of him dancing next to a Christmas tree in his underwear. He was the type of guy to tell reporters he lived with 20 cats, just to fool around. And he remained that guy through all the millions he earned from Groupon’s funding.

With the arrival of winter break, the team hopes more students will have time to rejoin the build and complete the remaining architectural aspects, as well as such fun interactive elements as sledding on campus hills. When Axelrod and Potts graduate in the spring, they’re hopeful that the project will be self-sustaining, with Potts saying that the project will give students the chance to “always be connected to campus [and] connected to Cornell students.”

Here I will a simple 3-tier application using AWS Lambda and AWS Gateway services which are provided by Amazon. Below is the high-level architecture of our ‘lambda-demo’ application.

A multi-tier architecture is a design pattern that is embraced by millions of developers around the world mainly because of its way of separating concerns clearly across many layers. The most widely adapted multi-tier application type is the 3-Tier architecture.

“Every single group project I’ve been a part of has been extremely diverse in various ways, and this is another example of that where you’re working with people,” Axelrod says. “People have one idea of how to do something, we talk about it as a group, we go through with making compromises. What was just a fun video game for us has turned into a really good way of learning how to become a person in the real world.”



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