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43 lines
886 B
43 lines
886 B
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @providesModule CircularBuffer
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*/
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var invariant = require("./invariant");
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class CircularBuffer {
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constructor(size) {
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invariant(size > 0, 'Buffer size should be a positive integer');
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this._size = size;
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this._head = 0;
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this._buffer = [];
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}
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write(entry) {
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if (this._buffer.length < this._size) {
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this._buffer.push(entry);
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} else {
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this._buffer[this._head] = entry;
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this._head++;
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this._head %= this._size;
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}
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return this;
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}
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read() {
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return this._buffer.slice(this._head).concat(this._buffer.slice(0, this._head));
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}
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clear() {
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this._head = 0;
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this._buffer = [];
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return this;
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}
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}
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module.exports = CircularBuffer; |