48 lines
1.6 KiB
JavaScript
48 lines
1.6 KiB
JavaScript
/*
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* Copyright The OpenTelemetry Authors
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* SPDX-License-Identifier: Apache-2.0
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*/
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/**
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* Get a key to uniquely identify a context value
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*
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* @since 1.0.0
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*/
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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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class BaseContext {
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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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constructor(parentContext) {
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// for minification
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const self = this;
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self._currentContext = parentContext ? new Map(parentContext) : new Map();
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self.getValue = (key) => self._currentContext.get(key);
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self.setValue = (key, value) => {
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const 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 = (key) => {
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const 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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}
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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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*
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* @since 1.0.0
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*/
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export const ROOT_CONTEXT = new BaseContext();
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//# sourceMappingURL=context.js.map
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