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diff --git a/simple/simple-common/src/main/java/org/simpleframework/common/thread/Scheduler.java b/simple/simple-common/src/main/java/org/simpleframework/common/thread/Scheduler.java
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+/*
+ * Scheduler.java October 2014
+ *
+ * Copyright (C) 2014, Niall Gallagher <niallg@users.sf.net>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or 
+ * implied. See the License for the specific language governing 
+ * permissions and limitations under the License.
+ */
+
+package org.simpleframework.common.thread;
+
+import java.util.concurrent.Executor;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * The <code>Scheduler</code> interface represents a means to execute
+ * a task immediately or after a specified delay. This queues the 
+ * task for the requested period of time before it is executed, if a
+ * delay is specified. How the task is executed is dependent on the
+ * implementation, however it will normally use a thread pool.
+ * 
+ * @author Niall Gallagher
+ */
+public interface Scheduler extends Executor {
+   
+   /**
+    * This will execute the task within the executor after the time
+    * specified has expired. If the time specified is zero then it
+    * will be executed immediately. Once the scheduler has been
+    * stopped then this method will no longer accept runnable tasks.
+    * 
+    * @param task this is the task to schedule for execution
+    * @param delay the time in milliseconds to wait for execution
+    */   
+   void execute(Runnable task, long delay);
+   
+   /**
+    * This will execute the task within the executor after the time
+    * specified has expired. If the time specified is zero then it
+    * will be executed immediately. Once the scheduler has been
+    * stopped then this method will no longer accept runnable tasks.
+    * 
+    * @param task this is the task to schedule for execution
+    * @param delay this is the delay to wait before execution
+    * @param unit this is the duration time unit to wait for
+    */   
+   void execute(Runnable task, long delay, TimeUnit unit);
+}