proxy.java

real-time design patterns in Real-time java

package designPatterns.Proxy;

import java.util.LinkedList;
import designPatterns.Data;

public abstract class Proxy {
	
	/*
	 * Shared data
	 */
	protected Data data;
	
	
	// Clients list
	protected LinkedList clientsList;

	public Proxy(Data data) {
		this.data = data;
		clientsList = new LinkedList();
	}	
	
	public void subscribe(ProxyClient client) {
		clientsList.addLast(client);
	}
	
	public void unsubscribe(ProxyClient client) {
		clientsList.remove(client);
	}

	public void accept(Data data) {
		this.data.copyValue(data);
		notifyClients();
	}

	protected abstract void notifyClients();
	
}