@@ -0,0 +1,1113 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one or more%0A * contributor license agreements. See the NOTICE file distributed with%0A * this work for additional information regarding copyright ownership.%0A * The ASF licenses this file to You under the Apache license, Version 2.0%0A * (the %22License%22); you may not use this file except in compliance with%0A * the License. You may obtain a copy of the License at%0A *%0A *      http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the license for the specific language governing permissions and%0A * limitations under the license.%0A */%0Apackage org.apache.logging.log4j.core.util;%0A%0A/**%0A * Interface to cancel a Runnable callback.%0A *%0A * @since 2.1%0A */%0Apublic interface Cancellable extends Runnable %7B%0A%0A    /**%0A     * Cancels the execution of this Runnable callback. This method has no effect if this has already executed.%0A     */%0A    void cancel();%0A%7D%0A

Add Cancellable interface.