01: // Copyright 2006, 2007 The Apache Software Foundation
02: //
03: // Licensed under the Apache License, Version 2.0 (the "License");
04: // you may not use this file except in compliance with the License.
05: // You may obtain a copy of the License at
06: //
07: // http://www.apache.org/licenses/LICENSE-2.0
08: //
09: // 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.tapestry.internal.events;
16:
17: /**
18: * Interface for objects that may cache information that can be invalidated.
19: *
20: *
21: * @see org.apache.tapestry.internal.events.InvalidationEvent
22: */
23: public interface InvalidationListener {
24: /** Invoked to indicate that some object is invalid. The receiver should clear its cache. */
25: void objectWasInvalidated();
26: }
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