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ThreadLocalStorage.java | - | - | - | - |
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1 | // Copyright 2004, 2005 The Apache Software Foundation | |
2 | // | |
3 | // Licensed under the Apache License, Version 2.0 (the "License"); | |
4 | // you may not use this file except in compliance with the License. | |
5 | // You may obtain a copy of the License at | |
6 | // | |
7 | // http://www.apache.org/licenses/LICENSE-2.0 | |
8 | // | |
9 | // Unless required by applicable law or agreed to in writing, software | |
10 | // distributed under the License is distributed on an "AS IS" BASIS, | |
11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
12 | // See the License for the specific language governing permissions and | |
13 | // limitations under the License. | |
14 | ||
15 | package org.apache.hivemind.service; | |
16 | ||
17 | /** | |
18 | * Provides a service which can temporarily store | |
19 | * thread-local data. This is useful in a multithreaded | |
20 | * environment, such as a servlet or Tapestry application. | |
21 | * ThreadLocalStorage acts like a map around thread local data. | |
22 | * | |
23 | * @author Howard Lewis Ship | |
24 | */ | |
25 | public interface ThreadLocalStorage | |
26 | { | |
27 | /** | |
28 | * Returns the thread-local object for the given key, or null | |
29 | * if no such object exists. | |
30 | */ | |
31 | public Object get(String key); | |
32 | ||
33 | /** | |
34 | * Stores the value object at the given key, overwriting | |
35 | * any prior value that may have been stored at that key. | |
36 | * Care should be taken in selecting keys to avoid | |
37 | * naming conflicts; in general, prefixing a key with | |
38 | * a module id is a good idea. | |
39 | */ | |
40 | public void put(String key, Object value); | |
41 | ||
42 | /** | |
43 | * Clears all keys. | |
44 | */ | |
45 | public void clear(); | |
46 | } |
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