1 /*
2 * Copyright 2007-2012 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.springbyexample.bean.scope.thread;
18
19 /**
20 * Thread scope context holder. It stores a
21 * <code>ThreadScopeAttributes</code> in a <code>ThreadLocal</code>
22 * variable to proved thread scoped access.
23 *
24 * @author David Winterfeldt
25 */
26 public class ThreadScopeContextHolder {
27
28 private static final ThreadLocal<ThreadScopeAttributes> threadScopeAttributesHolder = new InheritableThreadLocal<ThreadScopeAttributes>() {
29 protected ThreadScopeAttributes initialValue() {
30 return new ThreadScopeAttributes();
31 }
32 };
33
34 /**
35 * Gets <code>ThreadScopeAttributes</code>.
36 */
37 public static ThreadScopeAttributes getThreadScopeAttributes() {
38 return threadScopeAttributesHolder.get();
39 }
40
41 /**
42 * Sets <code>ThreadScopeAttributes</code>.
43 */
44 public static void setThreadScopeAttributes(ThreadScopeAttributes accessor) {
45 ThreadScopeContextHolder.threadScopeAttributesHolder.set(accessor);
46 }
47
48 /**
49 * Gets current <code>ThreadScopeAttributes</code>.
50 */
51 public static ThreadScopeAttributes currentThreadScopeAttributes() throws IllegalStateException {
52 ThreadScopeAttributes accessor = threadScopeAttributesHolder.get();
53
54 if (accessor == null) {
55 throw new IllegalStateException("No thread scoped attributes.");
56 }
57
58 return accessor;
59 }
60
61
62 }