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52 lines
2.2 KiB
JavaScript
52 lines
2.2 KiB
JavaScript
/*
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* Copyright The OpenTelemetry Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/** Get a key to uniquely identify a context value */
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export function createContextKey(description) {
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// The specification states that for the same input, multiple calls should
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// return different keys. Due to the nature of the JS dependency management
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// system, this creates problems where multiple versions of some package
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// could hold different keys for the same property.
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//
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// Therefore, we use Symbol.for which returns the same key for the same input.
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return Symbol.for(description);
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}
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var BaseContext = /** @class */ (function () {
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/**
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* Construct a new context which inherits values from an optional parent context.
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*
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* @param parentContext a context from which to inherit values
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*/
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function BaseContext(parentContext) {
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// for minification
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var self = this;
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self._currentContext = parentContext ? new Map(parentContext) : new Map();
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self.getValue = function (key) { return self._currentContext.get(key); };
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self.setValue = function (key, value) {
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var context = new BaseContext(self._currentContext);
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context._currentContext.set(key, value);
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return context;
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};
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self.deleteValue = function (key) {
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var context = new BaseContext(self._currentContext);
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context._currentContext.delete(key);
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return context;
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};
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}
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return BaseContext;
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}());
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/** The root context is used as the default parent context when there is no active context */
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export var ROOT_CONTEXT = new BaseContext();
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//# sourceMappingURL=context.js.map
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