Kevoree :: API framework in the basic principle of the Java class library
Kevoree is a Java -based open source API framework. Its design goal is to simplify the development and management process of distributed systems.This article will introduce the basic principles of the Kevoree framework in the Java class library and provide some Java code examples.
Kevoree's core idea is to model the distributed system into a set of connected components.These components can run on different physical nodes and communicate through the network.The Kevoree framework provides a model -based method to describe and manage the behavior and interoperability of these components.
The main concepts in Kevoree are nodes, component, communication channels, and binding.Nodes are an instance of a distributed system that can contain multiple components.The component is the basic construction block of the system. They encapsulate specific functions and can communicate by input and output ports.The communication channel defines the communication protocol and data format between components.Binding is a mechanism for establishing a communication relationship between components.
Below is a simple Kevoree example, showing how to create a node and two components, and communicate through the channel:
import org.kevoree.annotation.*;
import org.kevoree.framework.AbstractComponentType;
@Library(name="Java")
@Provides({
@ProvidedPort(name="input", type=PortType.MESSAGE)
})
@Requires({
@RequiredPort(name="output", type=PortType.MESSAGE)
})
@ComponentType
public class MyComponent extends AbstractComponentType {
@Port(name="input")
public void onInput(Object msg) {
System.out.println("Received: " + msg);
// Treat the message and send it to the output port
this.getPortByName("output", MessagePort.class).process(msg);
}
}
public class Main {
public static void main(String[] args) {
KevoreePlatform platform = KevoreePlatformFactory.createKevoreePlatform();
KevoreeNode node = platform.createNode("myNode");
MyComponent component1 = new MyComponent();
MyComponent component2 = new MyComponent();
node.addComponents(component1, component2);
node.createBinding(component1.getName(), "output", component2.getName(), "input");
// Start the node
node.start();
}
}
In the above example, we define a component called Mycomponent, which provides a port called input that can receive messages.Then, we used Kevoreeplatform in the main function to create a node called Mynode and add two Mycomponent components to the node.Finally, we used the CreateBinding method to establish a communication binding between these two components.
When we run this code, the output will display the received message and send it to the input port of another component.
The Kevoree framework implements configuration and management by adding annotations to the components in the Java library.These annotations include @library used to specify the library of components,@componenttype to specify the type of component,@ProvidedPort and @Requiredport to specify the input and output port of the component.
In short, Kevoree is a powerful API framework that can help simplify the development and management of distributed systems.By using annotations and APIs provided by Kevoree, developers can easily build scalable and highly configured distributed systems.I hope this article will help you understand the basic principles of the Kevoree framework in the Java class library.
