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Viewing file:     context.js (4.09 KB)      -rw-r--r--

/*
 * 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.
 */
var __read = (this && this.__read) || function (o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
    if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
        if (ar || !(i in from)) {
            if (!ar) ar = Array.prototype.slice.call(from, 0, i);
            ar[i] = from[i];
        }
    }
    return to.concat(ar || Array.prototype.slice.call(from));
};
import { NoopContextManager } from '../context/NoopContextManager';
import { getGlobal, registerGlobal, unregisterGlobal, } from '../internal/global-utils';
import { DiagAPI } from './diag';
var API_NAME = 'context';
var NOOP_CONTEXT_MANAGER = new NoopContextManager();
/**
 * Singleton object which represents the entry point to the OpenTelemetry Context API
 */
var ContextAPI = /** @class */ (function () {
    /** Empty private constructor prevents end users from constructing a new instance of the API */
    function ContextAPI() {
    }
    /** Get the singleton instance of the Context API */
    ContextAPI.getInstance = function () {
        if (!this._instance) {
            this._instance = new ContextAPI();
        }
        return this._instance;
    };
    /**
     * Set the current context manager.
     *
     * @returns true if the context manager was successfully registered, else false
     */
    ContextAPI.prototype.setGlobalContextManager = function (contextManager) {
        return registerGlobal(API_NAME, contextManager, DiagAPI.instance());
    };
    /**
     * Get the currently active context
     */
    ContextAPI.prototype.active = function () {
        return this._getContextManager().active();
    };
    /**
     * Execute a function with an active context
     *
     * @param context context to be active during function execution
     * @param fn function to execute in a context
     * @param thisArg optional receiver to be used for calling fn
     * @param args optional arguments forwarded to fn
     */
    ContextAPI.prototype.with = function (context, fn, thisArg) {
        var _a;
        var args = [];
        for (var _i = 3; _i < arguments.length; _i++) {
            args[_i - 3] = arguments[_i];
        }
        return (_a = this._getContextManager()).with.apply(_a, __spreadArray([context, fn, thisArg], __read(args), false));
    };
    /**
     * Bind a context to a target function or event emitter
     *
     * @param context context to bind to the event emitter or function. Defaults to the currently active context
     * @param target function or event emitter to bind
     */
    ContextAPI.prototype.bind = function (context, target) {
        return this._getContextManager().bind(context, target);
    };
    ContextAPI.prototype._getContextManager = function () {
        return getGlobal(API_NAME) || NOOP_CONTEXT_MANAGER;
    };
    /** Disable and remove the global context manager */
    ContextAPI.prototype.disable = function () {
        this._getContextManager().disable();
        unregisterGlobal(API_NAME, DiagAPI.instance());
    };
    return ContextAPI;
}());
export { ContextAPI };
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