@opentelemetry/core
Version:
OpenTelemetry Core provides constants and utilities shared by all OpenTelemetry SDK packages.
37 lines • 1.03 kB
JavaScript
/*
* Copyright The OpenTelemetry Authors
* SPDX-License-Identifier: Apache-2.0
*/
import { Deferred } from './promise';
/**
* Bind the callback and only invoke the callback once regardless how many times `BindOnceFuture.call` is invoked.
*/
export class BindOnceFuture {
_isCalled = false;
_deferred = new Deferred();
_callback;
_that;
constructor(callback, that) {
this._callback = callback;
this._that = that;
}
get isCalled() {
return this._isCalled;
}
get promise() {
return this._deferred.promise;
}
call(...args) {
if (!this._isCalled) {
this._isCalled = true;
try {
Promise.resolve(this._callback.call(this._that, ...args)).then(val => this._deferred.resolve(val), err => this._deferred.reject(err));
}
catch (err) {
this._deferred.reject(err);
}
}
return this._deferred.promise;
}
}
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