| // Copyright 2006, 2007 The Apache Software Foundation |
| // |
| // 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.apache.tapestry5.services; |
| |
| /** |
| * Interface for objects that may cache information that can be invalidated. Invalidation occurs when external files, |
| * from which in-memory data is cached, is determined to have changed. Granularity is very limited; when any external |
| * file is found to have changed, the event is fired (with the expectation that the cleared cache will be repopulated as |
| * necessary). |
| * |
| * @see org.apache.tapestry5.services.InvalidationEventHub |
| * @since 5.1.0.0 |
| */ |
| public interface InvalidationListener |
| { |
| /** |
| * Invoked to indicate that some object is invalid. The receiver should clear its cache. |
| */ |
| void objectWasInvalidated(); |
| } |
