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Viewing file:     buffers.js (2.41 KB)      -rw-r--r--

"use strict";

exports.__esModule = true;
exports.buffers = exports.BUFFER_OVERFLOW = undefined;

var _utils = /*#__PURE__*/require("./utils");

var BUFFER_OVERFLOW = exports.BUFFER_OVERFLOW = "Channel's Buffer overflow!";

var ON_OVERFLOW_THROW = 1;
var ON_OVERFLOW_DROP = 2;
var ON_OVERFLOW_SLIDE = 3;
var ON_OVERFLOW_EXPAND = 4;

var zeroBuffer = { isEmpty: _utils.kTrue, put: _utils.noop, take: _utils.noop };

function ringBuffer() {
  var limit = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 10;
  var overflowAction = arguments[1];

  var arr = new Array(limit);
  var length = 0;
  var pushIndex = 0;
  var popIndex = 0;

  var push = function push(it) {
    arr[pushIndex] = it;
    pushIndex = (pushIndex + 1) % limit;
    length++;
  };

  var take = function take() {
    if (length != 0) {
      var it = arr[popIndex];
      arr[popIndex] = null;
      length--;
      popIndex = (popIndex + 1) % limit;
      return it;
    }
  };

  var flush = function flush() {
    var items = [];
    while (length) {
      items.push(take());
    }
    return items;
  };

  return {
    isEmpty: function isEmpty() {
      return length == 0;
    },
    put: function put(it) {
      if (length < limit) {
        push(it);
      } else {
        var doubledLimit = void 0;
        switch (overflowAction) {
          case ON_OVERFLOW_THROW:
            throw new Error(BUFFER_OVERFLOW);
          case ON_OVERFLOW_SLIDE:
            arr[pushIndex] = it;
            pushIndex = (pushIndex + 1) % limit;
            popIndex = pushIndex;
            break;
          case ON_OVERFLOW_EXPAND:
            doubledLimit = 2 * limit;

            arr = flush();

            length = arr.length;
            pushIndex = arr.length;
            popIndex = 0;

            arr.length = doubledLimit;
            limit = doubledLimit;

            push(it);
            break;
          default:
          // DROP
        }
      }
    },
    take: take,
    flush: flush
  };
}

var buffers = exports.buffers = {
  none: function none() {
    return zeroBuffer;
  },
  fixed: function fixed(limit) {
    return ringBuffer(limit, ON_OVERFLOW_THROW);
  },
  dropping: function dropping(limit) {
    return ringBuffer(limit, ON_OVERFLOW_DROP);
  },
  sliding: function sliding(limit) {
    return ringBuffer(limit, ON_OVERFLOW_SLIDE);
  },
  expanding: function expanding(initialSize) {
    return ringBuffer(initialSize, ON_OVERFLOW_EXPAND);
  }
};