зеркало из https://github.com/mozilla/gecko-dev.git
77 строки
1.4 KiB
JavaScript
77 строки
1.4 KiB
JavaScript
#ifdef 0
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#endif
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/**
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* This class makes it easy to wait until a batch of callbacks has finished.
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*
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* Example:
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*
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* let batch = new Batch(function () alert("finished"));
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* let pop = batch.pop.bind(batch);
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*
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* for (let i = 0; i < 5; i++) {
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* batch.push();
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* setTimeout(pop, i * 1000);
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* }
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*
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* batch.close();
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*/
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function Batch(aCallback) {
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this._callback = aCallback;
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}
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Batch.prototype = {
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/**
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* The number of batch entries.
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*/
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_count: 0,
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/**
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* Whether this batch is closed.
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*/
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_closed: false,
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/**
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* Increases the number of batch entries by one.
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*/
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push: function Batch_push() {
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if (!this._closed)
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this._count++;
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},
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/**
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* Decreases the number of batch entries by one.
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*/
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pop: function Batch_pop() {
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if (this._count)
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this._count--;
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if (this._closed)
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this._check();
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},
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/**
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* Closes the batch so that no new entries can be added.
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*/
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close: function Batch_close() {
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if (this._closed)
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return;
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this._closed = true;
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this._check();
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},
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/**
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* Checks if the batch has finished.
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*/
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_check: function Batch_check() {
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if (this._count == 0 && this._callback) {
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this._callback();
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this._callback = null;
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}
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}
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};
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