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    1   // Copyright 2006, 2007 The Apache Software Foundation
    2   //
    3   // Licensed under the Apache License, Version 2.0 (the "License");
    4   // you may not use this file except in compliance with the License.
    5   // You may obtain a copy of the License at
    6   //
    7   //     http://www.apache.org/licenses/LICENSE-2.0
    8   //
    9   // Unless required by applicable law or agreed to in writing, software
   10   // distributed under the License is distributed on an "AS IS" BASIS,
   11   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   12   // See the License for the specific language governing permissions and
   13   // limitations under the License.
   14   
   15   package org.apache.tapestry5.internal.events;
   16   
   17   /**
   18    * Interface for objects that may cache information that can be invalidated. Invalidation occurs when external files,
   19    * from which in-memory data is cached, is determined to have changed.
   20    */
   21   public interface InvalidationListener
   22   {
   23       /**
   24        * Invoked to indicate that some object is invalid. The receiver should clear its cache.
   25        */
   26       void objectWasInvalidated();
   27   }

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