package net.sf.appstatus.core.services;
   
   import org.apache.commons.collections.ArrayStack;
   
   /**
    * This locator allows to retrieve the current ServiceMonitor. It uses a
    * ThreadLocal internally to track all running calls.
    *
    * @author Nicolas Richeton
   *
   */
  public class ServiceMonitorLocator {
  
  	private static final ThreadLocal<ArrayStack> monitorStack = new ThreadLocal<ArrayStack>() {
  		@Override
  		protected ArrayStack initialValue() {
  			return new ArrayStack();
  		}
  	};
  
  	public static IServiceMonitor getCurrentServiceMonitor() {
  		ArrayStack stack = monitorStack.get();
  
  		if (!stack.isEmpty()) {
  			return (IServiceMonitor) stack.peek();
  		}
  
  		return null;
  	}
  
  	public static ArrayStack getServiceMonitorStack() {
  		return monitorStack.get();
  	}
  
  }