NotificationUtils.java

package fr.openwide.core.spring.notification.util;

import static com.google.common.base.Preconditions.checkNotNull;

import java.util.concurrent.Callable;

import fr.openwide.core.spring.notification.service.NotificationBuilder;

public final class NotificationUtils {

	private NotificationUtils() { }
	
	private static final ThreadLocal<Boolean> NOTIFICATIONS_ENABLED = new ThreadLocal<Boolean>() {
		@Override
		protected Boolean initialValue() {
			return true;
		}
	};
	
	public static boolean isNotificationsEnabled() {
		return NOTIFICATIONS_ENABLED.get();
	}
	
	/**
	 * Executes a {@link Runnable} with all notifications from all {@link NotificationBuilder}s disabled.
	 */
	public static void executeSilently(Runnable runnable) {
		checkNotNull(runnable);
		try {
			NOTIFICATIONS_ENABLED.set(false);
			runnable.run();
		} finally {
			NOTIFICATIONS_ENABLED.set(true);
		}
	}
	
	/**
	 * Executes a {@link Callable} with all notifications from all {@link NotificationBuilder}s disabled.
	 * @throws Exception The exact same exception thrown by {@code callable}, if any.
	 */
	public static <T> T executeSilently(Callable<T> callable) throws Exception {
		checkNotNull(callable);
		try {
			NOTIFICATIONS_ENABLED.set(false);
			return callable.call();
		} finally {
			NOTIFICATIONS_ENABLED.set(true);
		}
	}

}