01: /*
02:
03: Derby - Class org.apache.derby.iapi.services.locks.Latch
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.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 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 getQualifier();
43:
44: public int getCount();
45: }
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