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Java > Open Source Codes > org > apache > ojb > broker > locking > LockIsolation


1 package org.apache.ojb.broker.locking;
2
3 /* Copyright 2002-2005 The Apache Software Foundation
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  * http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  */
17
18
19 /**
20  * This interface defines method that a Locking Strategy must implement
21  * according to the isolation level it represents.
22  */
23 abstract class LockIsolation
24 {
25     /**
26      * Returns the isolation level identity.
27      * @return The isolation level number.
28      */
29     abstract int getIsolationLevel();
30
31     /**
32      * Returns the isolation level identity as string.
33      * @return The isolation level as string.
34      */
35     abstract String JavaDoc getIsolationLevelAsString();
36
37     /**
38      * Decide if this lock strategy allows multiple read locks.
39      *
40      * @return <em>True</em> if multiple read locks allowed, else <em>False</em>.
41      */
42     abstract boolean allowMultipleRead();
43
44     /**
45      * Decide if this lock strategy allows a write lock when one or more read
46      * locks already exists.
47      *
48      * @return <em>True</em> if write lock allowed when read lock exist, else <em>False</em>.
49      */
50     abstract boolean allowWriteWhenRead();
51
52     /**
53      * Decide if this lock strategy allows one or more read locks when a write
54      * lock already exists.
55      *
56      * @return <em>True</em> if read locks allowed when write lock exist, else <em>False</em>.
57      */
58     abstract boolean allowReadWhenWrite();
59 }
60
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