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Viewing file:     context.js (2.25 KB)      -rw-r--r--

"use strict";
/*
 * Copyright The OpenTelemetry 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
 *
 *      https://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.
 */
Object.defineProperty(exports, "__esModule", { value: true });
exports.ROOT_CONTEXT = exports.createContextKey = void 0;
/** Get a key to uniquely identify a context value */
function createContextKey(description) {
    // The specification states that for the same input, multiple calls should
    // return different keys. Due to the nature of the JS dependency management
    // system, this creates problems where multiple versions of some package
    // could hold different keys for the same property.
    //
    // Therefore, we use Symbol.for which returns the same key for the same input.
    return Symbol.for(description);
}
exports.createContextKey = createContextKey;
class BaseContext {
    /**
     * Construct a new context which inherits values from an optional parent context.
     *
     * @param parentContext a context from which to inherit values
     */
    constructor(parentContext) {
        // for minification
        const self = this;
        self._currentContext = parentContext ? new Map(parentContext) : new Map();
        self.getValue = (key) => self._currentContext.get(key);
        self.setValue = (key, value) => {
            const context = new BaseContext(self._currentContext);
            context._currentContext.set(key, value);
            return context;
        };
        self.deleteValue = (key) => {
            const context = new BaseContext(self._currentContext);
            context._currentContext.delete(key);
            return context;
        };
    }
}
/** The root context is used as the default parent context when there is no active context */
exports.ROOT_CONTEXT = new BaseContext();
//# sourceMappingURL=context.js.map