✏ 编辑: channel.js

"use strict";

module.exports = makeChannel;

function makeChannel(bufferSize, monitor) {
  bufferSize = bufferSize|0;
  var dataQueue = [];
  var readQueue = [];
  var drainList = [];

if (typeof monitor === "string") {
    monitor = log(monitor);
  }

return {
    drain: drain,
    put: put,
    take: take,
  };

function drain(callback) {
    if (typeof callback !== "function") {
      throw new TypeError("callback must be function");
    }
    if (dataQueue.length <= bufferSize) return callback();
    drainList.push(callback);
  }

// Returns true when it's safe to continue without draining
  function put(item) {
    if (monitor) monitor("put", item);
    if (readQueue.length) {
      if (monitor) monitor("take", item);
      readQueue.shift()(null, item);
    }
    else {
      dataQueue.push(item);
    }
    return dataQueue.length <= bufferSize;
  }

function log(name) {
  return function (type, value) {
    console.info(name, type, value);
  };
}

[X] 取消