ActiveJ

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ActiveJ

Developer(s)	ActiveJ LLC
Initial release	June 13, 2020 (2020-06-13)
Stable release	v3.0 / November 12, 2020 (2020-11-12)
Repository	ActiveJ Repository
Written in	Java
Engine
Operating system	Cross-platform
Website	https://activej.io

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ActiveJ is an open-source Java platform built from the ground up for developing modern web, cloud, high-load, and microservices solutions.:. Released under Apache license 2.0, ActiveJ features a full stack of technologies with an asynchronous programming model.

All ActiveJ components are published on Maven Central Repository and also on ActiveJ GitHub repository. ActiveJ is listed in awesome-java, a curated list of awesome Java frameworks, libraries and software.

History

ActiveJ v1.0 was released on Jun 13, 2020. It is an improved and restructured version of the DataKernel framework. After DataKernel v3.0 release, the framework was significantly reorganized to improve usability and performance. Some of the platform components were separated, so that they can be used as stand-alone libraries.

Structure

ActiveJ consists of several loosely coupled components that complement each other. Conceptually they can be grouped as following:

Core components

• ActiveInject. Powerful and lightweight dependency injection library without third-party dependencies. Can be used independently of ActiveJ platform.
• Async I/O core: Promise, Eventloop, Net.
• Fast and asynchronous data stream processing: Datastream, CSP.
• High-performance HTTP component, features asynchronous HTTP clients and servers . Can be used independently of ActiveJ.
• Bootstrapping and lifecycle management utils: Launcher, Service Graph, JMX, Triggers.

Bytecode manipulation tools

These components can be used as stand-alone libraries.

• ActiveSerializer . World’s fastest JVM-based Serializer according to the benchmarks conducted Nov 11, 2019 (as a part of DataKernel framework) using JVM-serializers test.
• ActiveCodegen. Dynamic runtime code generation without reflection.
• ActiveSpecializer. Optimizes application code for JVM in runtime and speeds it up by up to 7 times.

Cluster technologies

• ActiveRPC. A high-performance RPC implementation with binary protocol for distributed applications and microservices.
• ActiveFS. Lightweight library for building scalable distributed file storage.
• ActiveCRDT (beta). State-based conflict-free replicated data type implementation

Features

The core ActiveJ principles are:

• Explicit design
• Flexibility and extensibility
• No excessive abstractions
• Minimal third-party dependencies
• Loosely coupled components
• Business logic over framework specifications

Examples

Here is a basic example of ActiveJ web application. It utilizes Launcher and HTTP components, along with ActiveInject library

public final class HttpHelloWorldExample extends HttpServerLauncher {
	@Provides
	AsyncServlet servlet() {
		return request -> HttpResponse.ok200().withPlainText("Hello World");
	}

	public static void main(String[] args) throws Exception {
		Launcher launcher = new HttpHelloWorldExample();
		launcher.launch(args);
	}
}

The result of this application launching will be the “Hello World” message on localhost:8080:

Notable use case

ActiveJ and its predecessor DataKernel are widely used at AdKernel LLC, a technical solution provider for digital advertising.

External links

• ActiveJ official website - activej.io

This article "ActiveJ" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:ActiveJ. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.

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