The NANNING framework technical principles and application research in the Java class library

The Nanning framework is a technology widely used in the Java library.It provides a way to automate the Java library into distributed services.This article will study the technical principles and applications of the Nanning framework. The technical principles of the Nanning framework mainly include two aspects: dynamic proxy and remote process call (RPC).Dynamic proxy refers to generating agents during runtime. The proxy class implements the interface and forwards the method call to the actual object.RPC refers to the method of calling remote through network transmission so that different nodes in distributed systems can communicate with each other. In the NANNING framework, by using dynamic proxy technology, the class and methods in the Java class library are converted into distributed services.First, the class and methods that need to be remotely call are marked as remote accessable.Next, the Nanning framework will generate an agent class at runtime and register the proxy class to the service registration center of the framework.When other nodes need to call this method, send the request to the service registration center through RPC technology, and then forward the request to the actual object by the agent class for processing.Finally, the processing results are returned to the call party. In order to achieve the above technical principles, some code and configuration settings are required.First of all, use specific annotations in the Java class to mark the class and methods that need to be exposed to remote services.For example, use @Rmote markers on the class, indicating that this class can be accessed remotely; using @remotemethod is marked in the method, indicating that this method can be called remotely.Then, in the configuration file of the project, the relevant configuration of the Nanning framework needs to be set, such as the address and port of the designated service registration center. The following is an example code that demonstrates how to use the Nanning framework to transform the Java library into a distributed service: import org.apache.commons.nanning.*; // Class that needs remote calls @Remote public class ExampleClass { // How to call remote calls @RemoteMethod public String hello(String name) { return "Hello, " + name + "!"; } } public class Main { public static void main(String[] args) { ExampleClass example = new ExampleClass(); // Convert the ExampleClass object to a distributed service Object proxy = AspectFactory.newInstance(example); // Register the proxy object to the service registration center RegistryClient registry = new RegistryClient("localhost", 8080); registry.register("example", proxy); // Waiting for remote calls // Close the service registration center registry.close(); } } In the above code, the ExampleClass class is labeled as @remote so that it can be accessed remotely.In the main method of the main class, first create an example of the ExampleClass, and transform it into a proxy object through the aspectFactory.newinstance method.Then, register the proxy object proxy to the service registration center registryClient to identify the registered name "Example".Finally, the service registration center will continue to run, waiting for the remote calls of other nodes.When you no longer need to provide distributed services, you can turn off the service registration center through the registry.close () method. In summary, the Nanning framework is a technology used to convert Java libraries into distributed services.It calls technology through dynamic proxy and remote process to enable different nodes to communicate with each other and realize remote calls of methods in the class library.Through some simple code and configuration settings, the Java class library can be easily converted into distributed services.