01: /*
02:
03: Derby - Class org.apache.derby.iapi.store.raw.AuxObject
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (the "License"); you may not use this file except in compliance with
10: the License. You may obtain a copy of the License at
11:
12: http://www.apache.org/licenses/LICENSE-2.0
13:
14: Unless required by applicable law or agreed to in writing, software
15: distributed under the License is distributed on an "AS IS" BASIS,
16: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17: See the License for the specific language governing permissions and
18: limitations under the License.
19:
20: */
21:
22: package org.apache.derby.iapi.store.raw;
23:
24: /**
25:
26: The interface of objects which can be associated with a page while it's in cache.
27:
28: @see Page#setAuxObject
29:
30: */
31: public interface AuxObject {
32: /**
33: This method is called by the page manager when it's about to evict a
34: page which is holding an aux object, or when a rollback occurred on the
35: page. The aux object should release its resources. The aux object can
36: assume that no one else has access to it via the raw store during this
37: method call. After this method returns the raw store throws away any
38: reference to this object.
39: */
40: public void auxObjectInvalidated();
41: }
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