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RMI (part 2)

Java Collections, Level 2, Lesson 10

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last condition doesn't validate.

Implement the run() method on SERVER_THREAD. It will simulate the server:
1) Initialize the registry field. It will accept and process requests on port 2099.
2) Create two objects: a Cat and a Dog.
3) Use the UnicastRemoteObject class to create Remote objects for the Cat and Dog objects you've created.
The Remote objects will be able to receive method calls using the chosen port (2099).
4) For Cat and Dog, add to the registry a mapping between a unique text key and the Remote object. Make up your own text key.
5) If an exception occurs, output its stack trace to the System.err stream.
The main() method is not tested.

Requirements:

You must initialize the registry field in the run() method. Use LocateRegistry.createRegistry(2099) to do this.
In the run() method, you need to create two objects: a Cat and a Dog.
In the run() method, you need to use UnicastRemoteObject.exportObject(Remote, int) to create Remote objects for the Cat and Dog objects that you've created.
You need to use registry.bind(String, Remote) to add a unique text key and Remote object to the registry for the Cat and Dog objects.
If an exception occurs, you need to output its stack trace to the System.err stream using printStackTrace().

package com.codegym.task.task32.task3208; import java.rmi.AlreadyBoundException; import java.rmi.NotBoundException; import java.rmi.Remote; import java.rmi.RemoteException; import java.rmi.registry.LocateRegistry; import java.rmi.registry.Registry; import java.rmi.server.UnicastRemoteObject; /* RMI (part 2) */ public class Solution { public static Registry registry; // Pretend we're starting an RMI client as the CLIENT_THREAD thread public static Thread CLIENT_THREAD = new Thread(new Runnable() { @Override public void run() { try { for (String bindingName : registry.list()) { Animal service = (Animal) registry.lookup(bindingName); service.printName(); service.speak(); } System.exit(0); } catch (RemoteException e) { e.printStackTrace(); } catch (NotBoundException e) { e.printStackTrace(); } } }); // Pretend we're starting an RMI server as the SERVER_THREAD thread public static Thread SERVER_THREAD = new Thread(new Runnable() { @Override public void run() { //write your code here Animal cat = new Cat("Cat"); Animal dog = new Dog("Dog"); try { registry = LocateRegistry.createRegistry(2099); Remote catRemote = UnicastRemoteObject.exportObject(cat,0); registry.bind("cat.re",catRemote); Remote dogRemote = UnicastRemoteObject.exportObject(dog,0); registry.bind("dog.re",dogRemote); } catch (RemoteException e) { e.printStackTrace(); } catch (AlreadyBoundException e) { e.printStackTrace(); } } }); public static void main(String[] args) throws InterruptedException { // Starting an RMI server thread SERVER_THREAD.start(); Thread.sleep(1000); // Start the client CLIENT_THREAD.start(); } }

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Darek

Level 41 , Katowice, Poland

27 July 2020, 18:47

In Solution Class declare: public static final String UNIC_CAT_NAME = "Cat"; public static final String UNIC_DOG_NAME = "Dog"; In run void in Thred SERVER_THREAD write: Remote catRemote = UnicastRemoteObject.exportObject(cat, 0); Remote dogRemote = UnicastRemoteObject.exportObject(dog, 0); registry.bind(UNIC_CAT_NAME, catRemote); registry.bind(UNIC_DOG_NAME, dogRemote); The rest is OK Verify is ok.