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Java > Open Source Codes > org > springframework > scheduling > commonj > DelegatingWork


1 /*
2  * Copyright 2002-2007 the original author or authors.
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
17 package org.springframework.scheduling.commonj;
18
19 import commonj.work.Work;
20
21 import org.springframework.scheduling.SchedulingAwareRunnable;
22 import org.springframework.util.Assert;
23
24 /**
25  * Simple Work adapter that delegates to a given Runnable.
26  *
27  * @author Juergen Hoeller
28  * @since 2.0
29  * @see commonj.work.Work
30  * @see java.lang.Runnable
31  */
32 public class DelegatingWork implements Work {
33
34     private final Runnable JavaDoc delegate;
35
36
37     /**
38      * Create a new DelegatingWork.
39      * @param delegate the Runnable implementation to delegate to
40      * (may be a SchedulingAwareRunnable for extended support)
41      * @see org.springframework.scheduling.SchedulingAwareRunnable
42      * @see #isDaemon()
43      */
44     public DelegatingWork(Runnable JavaDoc delegate) {
45         Assert.notNull(delegate, "Delegate must not be null");
46         this.delegate = delegate;
47     }
48
49     /**
50      * Return the wrapped Runnable implementation.
51      */
52     public final Runnable JavaDoc getDelegate() {
53         return this.delegate;
54     }
55
56
57     /**
58      * Delegates execution to the underlying Runnable.
59      */
60     public void run() {
61         this.delegate.run();
62     }
63
64     /**
65      * This implementation delegates to
66      * {@link org.springframework.scheduling.SchedulingAwareRunnable#isLongLived()},
67      * if available.
68      */
69     public boolean isDaemon() {
70         return (this.delegate instanceof SchedulingAwareRunnable &&
71                 ((SchedulingAwareRunnable) this.delegate).isLongLived());
72     }
73
74     /**
75      * This implementation is empty, since we expect the Runnable
76      * to terminate based on some specific shutdown signal.
77      */
78     public void release() {
79     }
80
81 }
82
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