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diff --git a/simple/simple-common/src/main/java/org/simpleframework/common/lease/ContractQueue.java b/simple/simple-common/src/main/java/org/simpleframework/common/lease/ContractQueue.java
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+/*
+ * ContractQueue.java May 2004
+ *
+ * Copyright (C) 2004, 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.lease;
+
+import java.util.concurrent.DelayQueue;
+
+/**
+ * The <code>ContraceQueue</code> object is used to queue contracts
+ * between two asynchronous threads of execution. This allows the
+ * controller to schedule the lease contract for expiry. Taking the
+ * contracts from the queue is delayed for the contract duration.
+ * 
+ * @author Niall Gallagher
+ * 
+ * @see org.simpleframework.common.lease.Contract
+ */
+class ContractQueue<T> extends DelayQueue<Contract<T>> {
+   
+   /**
+    * Constructor for the <code>ContractQueue</code> object. This
+    * is used to create a queue for passing contracts between two
+    * asynchronous threads of execution. This is used by the 
+    * lease controller to schedule the lease contract for expiry.    
+    */
+    public  ContractQueue() {
+      super();
+    }
+}