78 lines
2.8 KiB
JavaScript
78 lines
2.8 KiB
JavaScript
"use strict";
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// Copyright (c) Microsoft Corporation. All rights reserved. Licensed under the MIT license.
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// See LICENSE in the project root for license information.
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.SplitterTransform = void 0;
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const TerminalWritable_1 = require("./TerminalWritable");
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/**
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* Use this instead of {@link TerminalTransform} if you need to output `ITerminalChunk`
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* data to more than one destination.
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*
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* @remarks
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*
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* Splitting streams complicates the pipeline topology and can make debugging more difficult.
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* For this reason, it is modeled as an explicit `SplitterTransform` node, rather than
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* as a built-in feature of `TerminalTransform`.
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*
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* @public
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*/
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class SplitterTransform extends TerminalWritable_1.TerminalWritable {
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constructor(options) {
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super();
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this._destinations = new Set(options.destinations);
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}
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get destinations() {
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return this._destinations;
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}
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/**
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* Adds a destination to the set of destinations. Duplicates are ignored.
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* Only new chunks received after the destination is added will be sent to it.
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* @param destination - The destination to add.
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*/
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addDestination(destination) {
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this._destinations.add(destination);
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}
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/**
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* Removes a destination from the set of destinations. It will no longer receive chunks, and will be closed, unless
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* `destination.preventAutoclose` is set to `true`.
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* @param destination - The destination to remove.
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* @param close - If `true` (default), the destination will be closed when removed, unless `destination.preventAutoclose` is set to `true`.
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* @returns `true` if the destination was removed, `false` if it was not found.
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* @remarks
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* If the destination is not found, it will not be closed.
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*/
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removeDestination(destination, close = true) {
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if (this._destinations.delete(destination)) {
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if (close && !destination.preventAutoclose) {
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destination.close();
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}
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return true;
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}
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return false;
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}
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onWriteChunk(chunk) {
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for (const destination of this._destinations) {
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destination.writeChunk(chunk);
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}
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}
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onClose() {
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const errors = [];
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// If an exception is thrown, try to ensure that the other destinations get closed properly
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for (const destination of this._destinations) {
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if (!destination.preventAutoclose) {
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try {
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destination.close();
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}
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catch (error) {
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errors.push(error);
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}
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}
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}
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this._destinations.clear();
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if (errors.length > 0) {
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throw errors[0];
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}
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}
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}
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exports.SplitterTransform = SplitterTransform;
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//# sourceMappingURL=SplitterTransform.js.map
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