replicatedstackjgroups.ReplSet.java Source code

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Here is the source code for replicatedstackjgroups.ReplSet.java

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/*
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package replicatedstackjgroups;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.Scanner;
import org.jgroups.JChannel;
import org.jgroups.Message;
import org.jgroups.ReceiverAdapter;
import org.jgroups.View;
import org.jgroups.util.Util;
import org.json.simple.JSONObject;

/**
 *
 * @author Andarias Silvanus & Rita Sarah
 */
public class ReplSet<T> extends ReceiverAdapter {

    private ArrayList<T> container;
    JChannel channel;
    String user_name = System.getProperty("user.name", "n/a");

    public ReplSet() throws Exception {
        container = new ArrayList<T>();
        start();
    }

    public boolean add(T obj) {
        if (contains(obj))
            return false;
        else {
            container.add(obj);
            return true;
        }
    }

    public boolean contains(T obj) {
        return container.contains(obj);
    }

    public boolean remove(T obj) {
        if (contains(obj)) {
            container.remove(obj);
            return true;
        } else
            return false;
    }

    public int getLength() {
        return container.size();
    }

    public boolean isEmpty() {
        return container.isEmpty();
    }

    public T getObject(int idx) {
        return (T) container.get(idx);
    }

    public ArrayList getContainer() {
        return container;
    }

    private void start() throws Exception {
        channel = new JChannel(); // use the default config, udp.xml
        channel.setReceiver(this);
        channel.connect("ChatCluster");
        channel.getState(null, 10000);
        eventLoop();
        channel.close();
    }

    public void viewAccepted(View new_view) {
        //        System.out.println("** view: " + new_view);
    }

    public void receive(Message msg) {
        JSONObject json_obj = (JSONObject) msg.getObject();
        String mode = json_obj.get("mode").toString();
        T param = (T) json_obj.get("body");

        if (mode.equals("set_add")) {
            boolean res = add(param);
            if (res)
                System.out.println("set_add berhasil dilakukan");
            else
                System.out.println("set_add tidak berhasil dilakukan karena SET sudah mengandung object tersebut");
        } else if (mode.equals("set_contains")) {
            boolean res = contains(param);
            if (res)
                System.out.println("object tersebut exist di SET");
            else
                System.out.println("object tersebut tidak exist di SET");
        } else if (mode.equals("set_remove")) {
            boolean res = remove(param);
            if (res)
                System.out.println("set_remove berhasil dilakukan");
            else
                System.out
                        .println("set_remove tidak berhasil dilakukan karena SET tidak mengandung object tersebut");
        }
    }

    private void eventLoop() {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        Scanner input = new Scanner(System.in);
        JSONObject json_obj = new JSONObject();
        while (true) {
            try {
                System.out.print("> ");
                System.out.flush();
                //                String line = in.readLine().toLowerCase();
                String line = input.next().toLowerCase();

                if (line.startsWith("quit") || line.startsWith("exit"))
                    break;
                else if (line.startsWith("set_add")) {
                    T packet = (T) input.nextLine();
                    json_obj.put("mode", "set_add");
                    json_obj.put("body", packet);
                } else if (line.startsWith("set_contains")) {
                    T packet = (T) input.nextLine();
                    json_obj.put("mode", "set_contains");
                    json_obj.put("body", packet);
                } else if (line.startsWith("set_remove")) {
                    T packet = (T) input.nextLine();
                    json_obj.put("mode", "set_remove");
                    json_obj.put("body", packet);
                } else if (line.startsWith("set_print")) {
                    printSet();
                    json_obj.put("mode", "print");
                    json_obj.put("body", "");
                }

                Message msg = new Message(null, null, json_obj);
                channel.send(msg);
                json_obj.clear();
            } catch (Exception e) {
            }
        }
    }

    private void printSet() {
        if (container.isEmpty())
            System.out.println("SET kosong");
        else {
            for (int i = 0; i < container.size(); i++) {
                System.out.println(getObject(i));
            }
        }
    }

    public void getState(OutputStream output) throws Exception {
        synchronized (container) {
            Util.objectToStream(container, new DataOutputStream(output));
        }
    }

    @SuppressWarnings("unchecked")
    public void setState(InputStream input) throws Exception {
        ArrayList<T> remoteSet = (ArrayList<T>) Util.objectFromStream(new DataInputStream(input));

        synchronized (container) {
            container.clear();
            container.addAll(remoteSet);
        }

        //        System.out.println(remoteSet.size() + " messages in chat history):");
        //        for(int i = 0; i<remoteSet.size(); i++)
        //            System.out.println(remoteSet.get(i));
    }

    public static void main(String[] args) throws Exception {
        ReplSet RS = new ReplSet<String>();
    }
}