tapestry-core/src/main/java/org/apache/tapestry5/internal/events/InvalidationListener.java

// 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.internal.events;

/**
 * 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.
 */
public interface InvalidationListener
{
    /**
     * Invoked to indicate that some object is invalid. The receiver should clear its cache.
     */
    void objectWasInvalidated();
}