package rep;

import java.util.LinkedList;

public class SessionManagerList extends LinkedList<Forwarder>{

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private int mySMID=0;
	private int smid_root=0;
	private Forwarder parent=new NullForwarder(null);
	private LinkedList<Forwarder> waiting= new LinkedList<Forwarder>();


	public void setMaster(Forwarder f) {
		this.parent = f;
	}

	public void sendToMaster(REPCommand repCmd) {
		parent.send(repCmd);
	}

	public void sendToSlaves(REPCommand repCmd) {
		for(Forwarder channel : this){
			channel.send(repCmd);
		}
	}

	public boolean isMaster() {
		return !parent.isForwarder();
	}

	public int addNewSessionManager(Forwarder fw,REPCommand receivedCommand) {
		add(fw);
		int sid = ++smid_root;
		fw.setSID(sid);
		fw.setName(receivedCommand.string);
		return sid;
	}


	public void setSessionManagerID(int sid) {
		mySMID = sid;
	}
	
	public int sessionManagerID() {
		return mySMID;
	}

	public void addWaitingSessionManager(Forwarder fw, REPCommand command) {
		// SID assign 待ちのSessionManager Channelを登録する
		waiting.add(fw);
		
	}

	public void assignSessionManagerIDtoWaitingSM(int sid) {
		// 待っていたSession Manager ChannelにSession IDを登録し，Session Manager List
		// に登録する。この次のsm_join_ackでSIDが確定する。
		Forwarder waiter;
		if ((waiter=waiting.poll())!=null) {
			waiter.setSID(sid);
			add(waiter);
			return;
		}
		assert false;
	}

	public void setParent(Forwarder fw) {
		parent = fw;
	}
	
	public Forwarder parent() {
		return parent;
	}




}