package de.tudarmstadt.informatik.hostage;

/**
 *  Saves the amount of active connections and limits them to a specific number.  
 * @author Wulf Pfeiffer
 */
public class ConnectionRegister {
	
	/** Maximum connections that are allowed to be open. */
	private static int maxConnections = 2;
	/** Active connections . */
	private static int openConnections = 0;
	
	/** 
	 * Returns the maximum number of active connections.
	 * @return maximum number of active connections.
	 */
	public static int getMaxConnections() {
		return maxConnections;
	}
	
	/**
	 * Sets the maximum number of active connections.
	 * @param maxConnections the new maximum.
	 */
	public static void setMaxConnections(int maxConnections) {
		ConnectionRegister.maxConnections = maxConnections;
	}
	
	/**
	 * Returns the number of active connections.
	 * @return number of active connections.
	 */
	public static int getOpenConnections() {
		return openConnections;
	}
	
	/**
	 * Returns if there are new connections allowed or not.
	 * @return true if a new connection is allowed, else false.
	 */
	public static boolean isConnectionFree() {
		return openConnections < maxConnections;
	}
	
	/**
	 * Registers a new active connection if there are connections allowed.
	 * @return true if a new connection has been successfully registered, else false.
	 */
	public static boolean newOpenConnection() {
		if(isConnectionFree()) {
			openConnections++;
			return true;
		} else {
			return false;
		}
	}
	
	/**
	 * Deregisters a active connection if at least one active connection is registered.
	 * @return true if the connection has been successfully unregistered, else false.
	 */
	public static boolean closeConnection() {
		if(openConnections > 0) {
			openConnections--;
			return true;
		} else {
			return false;
		}
	}
	
}