01: package org.apache.lucene.store;
02:
03: /**
04: * Licensed to the Apache Software Foundation (ASF) under one or more
05: * contributor license agreements. See the NOTICE file distributed with
06: * this work for additional information regarding copyright ownership.
07: * The ASF licenses this file to You under the Apache License, Version 2.0
08: * (the "License"); you may not use this file except in compliance with
09: * the License. You may obtain a copy of the License at
10: *
11: * http://www.apache.org/licenses/LICENSE-2.0
12: *
13: * Unless required by applicable law or agreed to in writing, software
14: * distributed under the License is distributed on an "AS IS" BASIS,
15: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16: * See the License for the specific language governing permissions and
17: * limitations under the License.
18: */
19:
20: import java.io.IOException;
21:
22: /**
23: * Use this {@link LockFactory} to disable locking entirely.
24: * This LockFactory is used when you call {@link FSDirectory#setDisableLocks}.
25: * Only one instance of this lock is created. You should call {@link
26: * #getNoLockFactory()} to get the instance.
27: *
28: * @see LockFactory
29: */
30:
31: public class NoLockFactory extends LockFactory {
32:
33: // Single instance returned whenever makeLock is called.
34: private static NoLock singletonLock = new NoLock();
35: private static NoLockFactory singleton = new NoLockFactory();
36:
37: public static NoLockFactory getNoLockFactory() {
38: return singleton;
39: }
40:
41: public Lock makeLock(String lockName) {
42: return singletonLock;
43: }
44:
45: public void clearLock(String lockName) {
46: };
47: };
48:
49: class NoLock extends Lock {
50: public boolean obtain() throws IOException {
51: return true;
52: }
53:
54: public void release() {
55: }
56:
57: public boolean isLocked() {
58: return false;
59: }
60:
61: public String toString() {
62: return "NoLock";
63: }
64: }
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