March 2020
Intermediate to advanced
275 pages
6h 59m
English
Content preview from Programming AWS Lambda
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Chapter 4. Operating AWS Lambda Functions
This chapter will introduce a more advanced method of building and packaging Java-based AWS Lambda functions. We’ll also go into more detail on the serverless-oriented version of AWS’s infrastructure-as-code tool, SAM, which you first used in Chapter 2. Finally, we’ll go over how Lambda functions and serverless applications are affected by AWS’s security model and how to use SAM to automatically enforce a least-privilege security model for our serverless application.
Before proceeding, we recommend that if you haven’t done so already that you download this book’s code examples.
Build and Package
The Lambda platform expects all user-provided code to be in the form of a ZIP archive file. Depending on which runtime you’re using and your actual business logic, that ZIP file may consist of source code, or code and libraries, or, in the case of Java, compiled byte code (class files) and libraries.
In the Java ecosystem, we often package our code into JAR (Java ARchive) files, to be run via the java -jar command, or to be used as libraries by other applications.
It turns out that a JAR file is simply a ZIP file with some additional metadata.
The Lambda platform doesn’t perform any special handling of JAR files—it treats them as ZIP files, just as it does for the other Lambda language runtimes.
Using a tool like Maven, we can specify the other libraries that our code depends on and have Maven download the right versions of those libraries (and ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.