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Java > Open Source Codes > org > quartz > simpl > SimpleTimeBroker


1 /*
2  * Copyright 2004-2005 OpenSymphony
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5  * use this file except in compliance with the License. You may obtain a copy
6  * 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, WITHOUT
12  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13  * License for the specific language governing permissions and limitations
14  * under the License.
15  *
16  */
17
18 /*
19  * Previously Copyright (c) 2001-2004 James House
20  */
21 package org.quartz.simpl;
22
23 import java.util.Date JavaDoc;
24
25 import org.quartz.SchedulerConfigException;
26 import org.quartz.spi.TimeBroker;
27
28 /**
29  * <p>
30  * The interface to be implemented by classes that want to provide a mechanism
31  * by which the <code>{@link org.quartz.core.QuartzScheduler}</code> can
32  * reliably determine the current time.
33  * </p>
34  *
35  * <p>
36  * In general, the default implementation of this interface (<code>{@link org.quartz.simpl.SimpleTimeBroker}</code>-
37  * which simply uses <code>System.getCurrentTimeMillis()</code> )is
38  * sufficient. However situations may exist where this default scheme is
39  * lacking in its robustsness - especially when Quartz is used in a clustered
40  * configuration. For example, if one or more of the machines in the cluster
41  * has a system time that varies by more than a few seconds from the clocks on
42  * the other systems in the cluster, scheduling confusion will result.
43  * </p>
44  *
45  * @see org.quartz.core.QuartzScheduler
46  *
47  * @author James House
48  */
49 public class SimpleTimeBroker implements TimeBroker {
50
51     /*
52      * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
53      *
54      * Interface.
55      *
56      * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
57      */
58
59     /**
60      * <p>
61      * Get the current time, simply using <code>new Date()</code>.
62      * </p>
63      */
64     public Date JavaDoc getCurrentTime() {
65         return new Date JavaDoc();
66     }
67
68     public void initialize() throws SchedulerConfigException {
69         // do nothing...
70 }
71
72     public void shutdown() {
73         // do nothing...
74 }
75
76 }
77
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