🧬 Project Nano

Introduction | Core Concept | Mechanics | Components | Getting Started | Build Nano | Benefits

🖼️ Introduction

Back to basics and forget about frameworks!

Nano is a lightweight concept which makes it easier for developer to write microservices in functional, fluent, chaining, plain, modern java with a nano footprint. Nano is also designed to be fully compilable with GraalVM to create native executables. To enhance efficiency and performance, Nano utilizes non-blocking virtual threads from Project Loom.

📐 Core Concept

Nano handles threads for you and provides a basic construct for event driven architecture. It's providing a simple way to write microservices in a functional fluent and chaining style. Objects are less needed thanks to the underlying TypeMap. Nano provides full access to all internal components, resulting in very few private methods or fields.

📚 Components

All you need to know are few classes: Context, Events, Logger, Schedulers, Services

flowchart LR
    nano(((Nano))) --> context[Context]
    context --> logger[Logger]
    logger --> events[Events]
    events --> services[Services]
    services --> schedulers[Schedulers]
    
    style nano fill:#90CAF9,stroke:#1565C0,stroke-width:1px,color:#1A237E,rx:2%,ry:2%
    style context fill:#90CAF9,stroke:#1565C0,stroke-width:1px,color:#1A237E,rx:2%,ry:2%
    style logger fill:#90CAF9,stroke:#1565C0,stroke-width:1px,color:#1A237E,rx:2%,ry:2%
    style events fill:#90CAF9,stroke:#1565C0,stroke-width:1px,color:#1A237E,rx:2%,ry:2%
    style services fill:#90CAF9,stroke:#1565C0,stroke-width:1px,color:#1A237E,rx:2%,ry:2%
    style schedulers fill:#90CAF9,stroke:#1565C0,stroke-width:1px,color:#1A237E,rx:2%,ry:2%

⚙️ Mechanics

Error Handling
Registers (ConfigRegister, TypeConversionRegister, LogFormatRegister, EventChannelRegister)
Integrations (🌱 Spring Boot, 🧑‍🚀 Micronaut, 🐸 Quarkus)
Code Examples

📚 Getting Started

Maven example


<dependency>
    <groupId>berlin.yuna</groupId>
    <artifactId>nano</artifactId>
    <version>1.0.0</version>
</dependency>

Gradle example

dependencies {
    implementation 'berlin.yuna:nano:1.0.0'
}

Simple Nano example with HttpService (a default service)

public static void main(final String[] args) {
    // Start Nano with HttpService
    final Nano app = new Nano(args, new HttpService());

    // listen to /hello
    app.subscribeEvent(EVENT_HTTP_REQUEST, event -> event.payloadOpt(HttpObject.class)
        .filter(HttpObject::isMethodGet)
        .filter(request -> request.pathMatch("/hello"))
        .ifPresent(request -> request.response().body(Map.of("Hello", System.getProperty("user.name"))).respond(event)));

    // Override error handling for HTTP requests
    app.subscribeEvent(EVENT_APP_UNHANDLED, event -> event.payloadOpt(HttpObject.class).ifPresent(request ->
        request.response().body("Internal Server Error [" + event.error().getMessage() + "]").statusCode(500).respond(event)));
}

🔨 Build Nano

add the native-image profile to your pom.xml and run mvn package -Pnative-image


<profiles>
    <!-- NATIVE COMPILATION -->
    <plugin>
        <groupId>org.graalvm.nativeimage</groupId>
        <artifactId>native-image-maven-plugin</artifactId>
        <version>21.2.0</version>
        <configuration>
            <imageName>ExampleApp</imageName>
            <mainClass>de.yuna.berlin.nativeapp.helper.ExampleApp</mainClass>
            <buildArgs>
                <!-- Reduces the image size - Ensures the native image doesn't include the JVM as a fallback option -->
                <buildArg>--no-fallback</buildArg>
                <!-- Disables the use of the GraalVM compilation server -->
                <buildArg>--no-server</buildArg>
                <!-- Improve startup time - Initialize classes at build time rather than at runtime -->
                <buildArg>--initialize-at-build-time</buildArg>
                <!-- Include all files under /resources -->
                <buildArg>-H:IncludeResources=resources/config/.*</buildArg>
            </buildArgs>
        </configuration>
        <executions>
            <execution>
                <goals>
                    <goal>native-image</goal>
                </goals>
                <phase>package</phase>
            </execution>
        </executions>
    </plugin>
</profiles>

✨ Benefits of Nano:

🧩 Modular Design: Nano's architecture is modular, making it easy to understand, extend, and maintain.
🧵 Concurrency Management: Efficiently handle asynchronous tasks using advanced thread management.
📡 Event-Driven Architecture: Robust event handling that simplifies communication between different parts of your application.
⚙️ Flexible Configuration: Configure your application using environment variables, system properties, or command-line arguments.
📊 Robust Logging and Error Handling: Integrated logging and comprehensive error handling mechanisms for reliable operation.
🚀 Scalable and Performant: Designed with scalability and performance in mind to handle high-concurrency scenarios.
🪶 Lightweight & Fast: Starts in milliseconds, uses ~10MB memory.
🌿 Pure Java, Pure Simplicity: No reflections, no regex, no unnecessary magic.
⚡ GraalVM Ready: For ahead-of-time compilation and faster startup.
🔒 Minimal Dependencies: Reduces CVE risks and simplifies updates.
🌊 Fluent & Stateless: Intuitive API design for easy readability and maintenance.
🛠️ Rapid Service Development: Build real services in minutes.

🤝 Contributing

Contributions to Nano are welcome! Please refer to our Contribution Guidelines for more information.

📜 License

Nano is open-source software licensed under the Apache license.

🙋‍ Support

If you encounter any issues or have questions, please file an issue here.

🌐 Stay Connected

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Nano

Install / Use

README