Aws Api Gateway Lambda Java Example

Aws Api Gateway Lambda Java Example – If you haven’t read Part 1 of this series, I provided “A Brief History of Serverless” to answer the questions What, Why, and How to get started? technical. Scared, very scared. Just kidding, but if you’re not a technical person, sorry, I think you should quit after the next paragraph.

Is a bit strange for some techies because there is actually a server where your code runs. The event is managed completely by the cloud service provider. You set up some configuration, but you don’t have to worry about provisioning instances or scaling (in/out) to meet your usage requirements. In any case, I generally do not deal with semantics even though it is important in many cases, not so much in this case. I mean, wouldn’t you rather tell your colleagues, “Check it out! I built this great “unmanaged app” on AWS. It’s really cool and really self-managing.” Uh… Yeah, me too.

Aws Api Gateway Lambda Java Example

Aws Api Gateway Lambda Java Example

As promised, I’ll walk you through a very simple (but not trivial) API using only local DynamoDB, local Lambda, and a serverless application model (SAM). For a hands-on introduction to the AWS Toolkit for IntelliJ and SAM for local Java development, check out Hiep Dinh’s article for orientation. It stops right after the installation described in part 1 of this series.

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What we want to focus on here is the SAM infrastructure template as in API coding natively, highlight some Java code to understand the API anatomy using absolutely no third-party frameworks, say a few words about DynamoDB, and compare and contrast the simplified SAM template.yaml with the “equivalent” CloudFormation Infrastructure-as-Code. This will not be a step-by-step guide. There are many in the blogosphere. Instead, I will highlight some of the more interesting parts of my design, insights and tips gathered along the way, as well as hints for further research. village

The architecture diagram below illustrates the API for managing an online Rolodex. For young people reading this, it just means a contact list in the old language. This is finally where I went with the design after local development using SAM and doing some additional work on the CloudFormation (CFN) template. You can see that it is a complete set of serverless AWS services. Don’t worry, we will focus on what you see in the lower right corner of the architecture diagram, the RoldexAPI Lambda and DynamoDB functions.

File There is an AWS Labs-designed maven archetype, which is the preferred way to start a new project. My RolodexAPI project contains a Java class called LambdaFunction (which acts as our API controller / dispatcher), some contact models and gateway responses are required (for the API gateway), and some layers including a simple service layer and a data access layer that do. CRUD operations use the AWS SDK for DynamoDB.

The documentation for creating a SAM template can be found here and I encourage you to take a look at it before proceeding. As I said in Part 1 of this series, SAM is an abstraction of CloudFormation and

Lambda & Java With The Aws Toolkit For Eclipse

(as seen below) tells CloudFormation to treat this yaml file with the SAM specification during “sam deploy”, which is an uber simple sam cli command used to deploy this Infrastructure-as-Code to the AWS cloud platform. Let’s take a quick look at some things

Powered model. In this case, the event is an interaction with the (implicitly created) access resource API hosting route, ‘/rolodex//contact’ with the GET Http method. The

Is the actual code that Lambda will call when you ping the endpoint in the browser or via postman, and

Aws Api Gateway Lambda Java Example

If you want to add another path to the API to be set by the function, just add another event below the function

Jenkins Cicd Pipeline

I have eliminated a lot of noise for you. Using some of these items shown in the map above, we can start building an API using Java.

The code below explains how to avoid third-party frameworks like Spring. It’s plain Java and what AWS Lambda provides (like the Context object).

I have implemented the RequestHandler function as a Controller / Dispatcher for all routes ‘/contact’. I don’t think this is overly complex, and for the focus part of your API this works great. If you have a route in the API that this function will handle other than ‘/contact’, for example ‘/company’, then you should use

Parameters of the API event. Then you can use the path in the code to upload/redirect to the correct one

Infographic] All You Need To Know About Aws Api Gateway And Resolving The Most Common Request Errors

Well, maybe because of performance. In part 4 of this series, I will refactor this serverless API using the Spring Framework and then do a benchmark to see if there are any differences. My intuition tells me that there will be some (sometimes my instincts tell me to eat too, so good). AWS Labs says Springs’ ComponentScan and other factors can reduce startup performance. Obviously running your own is not efficient in the long run from a development point of view and you don’t get all the benefits of a framework like Spring, but for simplicity performance reasons.

Arrange. This is pure conjecture at the moment. However, when in doubt, I go back to the voice in my head that says, “Just be stupid.” This generally prevented me from playing the main role in the made-for-YouTube movie “A Curious Case of Over-Technique”.

The only piece of the puzzle is the one mentioned above. DynamoDB is AWS’ serverless NoSQL answer to MongoDB and Cassandra. AWS makes it easy to get started by providing several methods for on-premises use. The simplest is to download a jar that can be run on port 8000, but you can also drag and run a docker container for your local DynamoDB host.

Aws Api Gateway Lambda Java Example

Note that if you run DynamoDB on your host using an executable jar, you’ll need to do some black magic in your hosts file since SAM runs your Lambda code inside a pulled-down Docker container, i.e. you’ll experience multiple query names. solution. I just saved you an hour to deal with. No thanks needed though. Just kidding, you better applaud for this post or the other.

Issues To Avoid When Implementing Serverless Architecture With Aws Lambda

I created a CFN template to support the creation of different arrays representing different environments (using a template variable called Stage see! Ref Stage in the CFN block above). Setting up a serverless environment is a non-trivial DevOps-oriented discussion, and not without discussion, because there are several ways you can achieve multiple environments using things like Lambda environment variables and / or API Gateway stage variables. Sergio Garcez’s nice discussion on the subject can be found here. As mentioned before, I decided to have one table per neighborhood. With high level DynamoDB Java API and classes like

It is a relatively painless process to dynamically override a table to be used in a certain environment even if an item such as “Contact” is labeled with a standard table name. I have shared the implementation of Contact Dao so you can see how it can be done.

The AWS documentation on the DynamoDB Java SDK is excellent and will help you get started.

In general, I found most AWS documentation to be well written and organized. You may come across outdated documentation as some services evolve at a rapid pace, but this will be a rare occurrence.

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Creating a good NoSQL table design for your application is beyond the scope of this article so I kept this implementation very simple. Using NoSQL refers to “access patterns”, which are the types of queries your application will need to execute. Contact table uses HASH key of String type named ‘owner_email’ and SORT key of String type named ‘contact_full_name’. This is sufficient for this API access pattern. To start, inject maven dependencies into your pom.xml as shown below. Then all you need to do is add a note to the pojo contact using the DynamoDB SDK note class.

Above. This process is no different than what you see in Spring Data JPA or your ORM of choice.

As you can see, simply defining the API path for ‘/rolodex//contacts’ in CloudFormation gets serious quickly. You must specify 3

Aws Api Gateway Lambda Java Example

Block to get what you want, and it does not even include more than a few other CFN blocks not shown here. As a developer, you will likely deploy your code to see if it works as intended in AWS on your own stack by self-deploying. However, a more sophisticated implementation and better control may be required, and that’s when you move to the better approach provided by CloudFormation. In Part 4 of this series, I will discuss using this parameterized CFN and the Code* family of services

Aws Lambda/java, Dynamodb And Api Gateway Integration

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