blob: c086d6d47d490ee0ee506a0aa13d6d8b9953d995 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* Copyright © 2016-2017 European Support Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.openecomp.sdc.logging.slf4j;
import java.util.Map;
/**
* Does not store a state other than initial context values. Objects of this class may be reused by multiple threads, therefore they must be stateless
* to prevent inadvertent exchange of context values between threads.
*
* @author evitaliy
* @since 08 Jan 2018
*/
final class Context {
private final Map<ContextField, String> originalCtx;
Context() {
this.originalCtx = MDCDelegate.copy();
}
/**
* Pushes the initial context onto current thread, and returns the existing context. The result cannot be stored as local state (see the class
* comments), and must be kept in a local variable to work properly.
*
* @return previous context values
*/
final Map<ContextField, String> replace() {
Map<ContextField, String> old = MDCDelegate.copy();
MDCDelegate.replace(this.originalCtx);
return old;
}
/**
* Pushes an old context onto current thread.
*
* @param old copy of the old context returned by {@link #replace()}
*/
final void revert(Map<ContextField, String> old) {
MDCDelegate.replace(old);
}
}
|
