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1   /***
2    *  Copyright 2003-2010 Terracotta, Inc.
3    *
4    *  Licensed under the Apache License, Version 2.0 (the "License");
5    *  you may not use this file except in compliance with the License.
6    *  You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   *  Unless required by applicable law or agreed to in writing, software
11   *  distributed under the License is distributed on an "AS IS" BASIS,
12   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   *  See the License for the specific language governing permissions and
14   *  limitations under the License.
15   */
16  package net.sf.ehcache.util;
17  
18  /***
19   * Loader for the TimeProvider implementation that will be used in SlewClock
20   * Changing this before loading the SlewClock class enables you to use some custom {@link SlewClock.TimeProvider} implementation.
21   * The default is {@link System#currentTimeMillis()}
22   *
23   * @author Alex Snaps
24   * @see SlewClock.TimeProvider
25   */
26  final class TimeProviderLoader {
27  
28      private static SlewClock.TimeProvider timeProvider = new SlewClock.TimeProvider() {
29          public final long currentTimeMillis() {
30              return System.currentTimeMillis();
31          }
32      };
33  
34      private TimeProviderLoader() {
35          // Do not instantiate me!
36      }
37  
38      /***
39       * Getter
40       * @return the currently set timeProvider
41       */
42      public static synchronized SlewClock.TimeProvider getTimeProvider() {
43          return timeProvider;
44      }
45  
46      /***
47       * Setter, needs to be set before the {@link SlewClock} class is being loaded!
48       * @param timeProvider the {@link SlewClock.TimeProvider} implementation to use.
49       */
50      public static synchronized void setTimeProvider(final SlewClock.TimeProvider timeProvider) {
51          TimeProviderLoader.timeProvider = timeProvider;
52      }
53  }