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Java > Open Source Codes > org > apache > derby > iapi > services > locks > Latch


1 /*
2
3    Derby - Class org.apache.derby.iapi.services.locks.Latch
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (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.services.locks;
23
24 /**
25     A Latch represents a latch held in the lock manager.
26 */
27 public interface Latch {
28
29     /**
30         Get the compatability space the latch is held in.
31     */
32     public Object JavaDoc getCompatabilitySpace();
33
34     /**
35         Gte the object the latch is held on.
36     */
37     public Lockable getLockable();
38
39     /**
40         Get the qualifier used when the latch was obtained.
41     */
42     public Object JavaDoc getQualifier();
43
44     public int getCount();
45 }
46
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