OPRuntime.java

package javax.op;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Set;
import java.util.HashSet;
import java.util.Iterator;
import gnu.java.nio.FileChannelImpl;

// XXX NVM CHANGE - added

/**
 * This class registers OPResumeListener objects for execution upon JVM re-initialization.
 */
public class OPRuntime {

	private static Set<OPResumeListener> listeners = null;

	private static Set<Class<?>> staticListeners = null;
	
	/**
	 * Adds a new listener.
   	 */
	public static void addListener(OPResumeListener listener) {
		// initialize listeners set if necessary
		if (listeners == null) {
			listeners = new HashSet<OPResumeListener>();
		}
		// add listener to listeners set
		listeners.add(listener);
	}

	/**
	 * Adds a new listener to a class that has a static resume() method.
   	 */
	public static void addStaticListener(Class<?> clazz) {
		// initialize listeners set if necessary
		if (staticListeners == null) {
			staticListeners = new HashSet<Class<?>>();
		}
		// add listener to listeners set
		staticListeners.add(clazz);
	}
	

	/**
	 * Method called by the JVM runtime to re-initialize OPResumeListener objects.
	 */
	public static void resumeAllListeners() {
		//System.out.println("OP - Resuming all OPResumeListener objects");
		// resume all listeners
		if (listeners != null) {
			Iterator<OPResumeListener> it = listeners.iterator();
			while(it.hasNext()) {
				OPResumeListener listener = it.next();
				listener.resume();
			}
		}
		// resume all static listeners
		if (staticListeners != null) {
			Iterator<Class<?>> it = staticListeners.iterator();
			while(it.hasNext()) {
				Class<?> clazz = it.next();
				Method method;
				try {
					//System.out.println("Getting resume method from class "+clazz);
										
					method = clazz.getMethod("resume", null);

					//System.out.println("Invoking static resume() method on class "+clazz);
					
					method.invoke(null, (Object[])null);
				} catch (NoSuchMethodException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (SecurityException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IllegalAccessException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IllegalArgumentException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (InvocationTargetException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
	}
}