Marc Mintel
5397309103
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52 lines
1.7 KiB
Plaintext
52 lines
1.7 KiB
Plaintext
"use strict";
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/*
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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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Object.defineProperty(exports, "__esModule", { value: true });
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exports.BindOnceFuture = void 0;
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const promise_1 = require("./promise");
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/**
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* Bind the callback and only invoke the callback once regardless how many times `BindOnceFuture.call` is invoked.
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*/
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class BindOnceFuture {
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_isCalled = false;
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_deferred = new promise_1.Deferred();
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_callback;
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_that;
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constructor(callback, that) {
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this._callback = callback;
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this._that = that;
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}
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get isCalled() {
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return this._isCalled;
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}
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get promise() {
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return this._deferred.promise;
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}
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call(...args) {
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if (!this._isCalled) {
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this._isCalled = true;
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try {
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Promise.resolve(this._callback.call(this._that, ...args)).then(val => this._deferred.resolve(val), err => this._deferred.reject(err));
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}
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catch (err) {
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this._deferred.reject(err);
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}
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}
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return this._deferred.promise;
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}
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}
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exports.BindOnceFuture = BindOnceFuture;
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//# sourceMappingURL=callback.js.map |