The design principle of the simple RMI framework in the Java library
Simple RMI (remote method call) framework is an important part of the Java class library, which is used to achieve distributed and remote computing.It provides a mechanism that enables the objects in the application to communicate and interact between different Java virtual machines (JVM).This article will introduce the design principles of the simple RMI framework in the Java class library and provide some Java code examples.
Design principle:
1. Define interface: Simple RMI framework is called remote method based on interface.In the design, a method is required to define a method that hopes to execute on the remote JVM.
public interface RemoteService extends Remote {
public String sayHello() throws RemoteException;
}
2. Implementation interface: Realize the defined interface on the remote JVM.This implementation class will be used to provide actual remote method logic.
public class RemoteServiceImpl implements RemoteService {
public String sayHello() throws RemoteException {
return "Hello from the remote JVM!";
}
}
3. Registration and binding: In the simple RMI framework, the remote object needs to be bound to a specific name so that the client can access it.
public class RemoteServer {
public static void main(String[] args) throws RemoteException, MalformedURLException {
RemoteService remoteService = new RemoteServiceImpl();
Naming.rebind("rmi://localhost:1099/RemoteService", remoteService);
}
}
4. Client calling: The client uses a binding name to find remote objects and call its method.
public class RemoteClient {
public static void main(String[] args) throws RemoteException, NotBoundException, MalformedURLException {
RemoteService remoteService = (RemoteService) Naming.lookup("rmi://localhost:1099/RemoteService");
String message = remoteService.sayHello();
System.out.println(message);
}
}
5. Remote transmission protocol: In the simple RMI framework, the Java RMI is used for remote transmission by default.This means that data is transmitted through Java serialization and dependentization on the Internet.
These are the basic design principles of the simple RMI framework.By defining interfaces, implementation interfaces, registration and binding remote objects, and client calls, remote communication and method calls between Java applications can be achieved.The simple RMI framework provides a convenient and powerful distributed computing solution, allowing developers to easily build a distributed system.
