blob: 1a4ef81b2d223f8778af6d186ab4979b417733e5 (
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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
/*
* Copyright 2017, OpenCensus Authors
*
* 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 io.opencensus.implcore.tags;
import io.grpc.Context;
import io.opencensus.common.Scope;
import io.opencensus.tags.TagContext;
import io.opencensus.tags.unsafe.ContextUtils;
import javax.annotation.Nullable;
/**
* Utility methods for accessing the {@link TagContext} contained in the {@link io.grpc.Context}.
*/
final class CurrentTagContextUtils {
private CurrentTagContextUtils() {}
/**
* Returns the {@link TagContext} from the current context.
*
* @return the {@code TagContext} from the current context.
*/
@Nullable
static TagContext getCurrentTagContext() {
return ContextUtils.TAG_CONTEXT_KEY.get();
}
/**
* Enters the scope of code where the given {@link TagContext} is in the current context and
* returns an object that represents that scope. The scope is exited when the returned object is
* closed.
*
* @param tags the {@code TagContext} to be set to the current context.
* @return an object that defines a scope where the given {@code TagContext} is set to the current
* context.
*/
static Scope withTagContext(TagContext tags) {
return new WithTagContext(tags);
}
private static final class WithTagContext implements Scope {
private final Context orig;
/**
* Constructs a new {@link WithTagContext}.
*
* @param tags the {@code TagContext} to be added to the current {@code Context}.
*/
private WithTagContext(TagContext tags) {
orig = Context.current().withValue(ContextUtils.TAG_CONTEXT_KEY, tags).attach();
}
@Override
public void close() {
Context.current().detach(orig);
}
}
}
|
