1 | /**
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2 | * Copyright 2019, OpenCensus Authors
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3 | *
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4 | * Licensed under the Apache License, Version 2.0 (the "License");
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5 | * you may not use this file except in compliance with the License.
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6 | * You may obtain a copy of the License at
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7 | *
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8 | * http://www.apache.org/licenses/LICENSE-2.0
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9 | *
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10 | * Unless required by applicable law or agreed to in writing, software
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11 | * distributed under the License is distributed on an "AS IS" BASIS,
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12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 | * See the License for the specific language governing permissions and
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14 | * limitations under the License.
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15 | */
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16 | /** TagKey represents a tag key */
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17 | export interface TagKey {
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18 | /** The name of the key. */
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19 | readonly name: string;
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20 | }
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21 | /** TagValue represents a tag value */
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22 | export interface TagValue {
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23 | /** The value of a tag. */
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24 | readonly value: string;
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25 | }
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26 | /** TagValueWithMetadata holds a TagValue and a TagMetadata. */
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27 | export interface TagValueWithMetadata {
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28 | /** The tag value */
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29 | readonly tagValue: TagValue;
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30 | /** The metadata for the tag */
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31 | readonly tagMetadata: TagMetadata;
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32 | }
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33 | /**
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34 | * TagMetadata contains properties associated with a Tag.
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35 | * Anytime a sender serializes a tag, sends it over the wire and receiver
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36 | * deserializes the tag then the tag is considered to have travelled one hop.
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37 | * There could be one or more proxy(ies) between sender and receiver. Proxies
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38 | * are treated as transparent entities and they do not create additional hops.
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39 | */
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40 | export interface TagMetadata {
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41 | /**
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42 | * For now, only special values of TagTtl are supported. In future,
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43 | * additional properties may be added to address specific situations.
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44 | */
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45 | readonly tagTtl: number;
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46 | }
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47 | /** TagTtl is an integer that represents number of hops a tag can propagate */
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48 | export declare enum TagTtl {
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49 | /**
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50 | * NO_PROPAGATION is considered to have local scope and is used within the
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51 | * process it created.
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52 | */
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53 | NO_PROPAGATION = 0,
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54 | /** UNLIMITED_PROPAGATION can propagate unlimited hops. */
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55 | UNLIMITED_PROPAGATION = -1
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56 | }
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