01: /*
02:
03: Derby - Class org.apache.derby.iapi.store.access.StaticCompiledOpenConglomInfo
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.access;
23:
24: import org.apache.derby.iapi.types.DataValueDescriptor;
25:
26: import org.apache.derby.iapi.services.io.Storable;
27:
28: import org.apache.derby.iapi.error.StandardException;
29:
30: /**
31:
32: Information that can be "compiled" once and then used over and over again
33: at execution time. This information is read only by both the caller and
34: the user, thus can be shared by multiple threads/transactions once created.
35:
36: This information is obtained from the getStaticCompiledConglomInfo(conglomid)
37: method call. It can then be used in openConglomerate() and openScan() calls
38: for increased performance. The information is only valid until the next
39: ddl operation is performed on the conglomerate. It is up to the caller to
40: provide an invalidation methodology.
41:
42: The static info would be valid until any ddl was executed on the conglomid,
43: and would be up to the caller to throw away when that happened. This ties in
44: with what language already does for other invalidation of static info. The
45: type of info in this would be containerid and array of format id's from which
46: templates can be created. The info in this object is read only and can
47: be shared among as many threads as necessary.
48:
49: **/
50:
51: public interface StaticCompiledOpenConglomInfo extends Storable {
52: /**
53: * routine for internal use of store only.
54: **/
55: DataValueDescriptor getConglom();
56: }
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