package org.apache.tuscany.sca.sample.comet;

import java.util.ArrayList;
import java.util.concurrent.CopyOnWriteArrayList;

import org.apache.tuscany.sca.binding.comet.runtime.callback.CometCallback;
import org.apache.tuscany.sca.binding.comet.runtime.callback.Status;
import org.oasisopen.sca.ComponentContext;
import org.oasisopen.sca.annotation.Context;
import org.oasisopen.sca.annotation.Scope;
import org.oasisopen.sca.annotation.Service;

@Service(ChatService.class)
@Scope("COMPOSITE")
public class ChatServiceImpl implements ChatService {

	@Context
	protected ComponentContext context;

	private CopyOnWriteArrayList<CometCallback> clients = new CopyOnWriteArrayList<CometCallback>();

	@Override
	public void postMessage(String user, String message) {
		for (CometCallback callback : new ArrayList<CometCallback>(clients)) {
			Status status = callback.sendMessage(user + ": " + message);
			if (status == Status.CLIENT_DISCONNECTED) {
				clients.remove(callback);
			}
		}
	}

	@Override
	public void register() {
		// saving the callback object during register() method so it will push data back to the client 
		// using the callback method defined for the register operation in the js when used
		clients.add(context.getRequestContext().<CometCallback> getCallback());
	}
}