晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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DIR:/lib/node_modules/npm/node_modules/libcipm/lib/
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Current File : //lib/node_modules/npm/node_modules/libcipm/lib/extract.js
'use strict'

const BB = require('bluebird')

const extractionWorker = require('./worker.js')
const figgyPudding = require('figgy-pudding')
const npa = require('npm-package-arg')
const WORKER_PATH = require.resolve('./worker.js')
let workerFarm

// Broken for now, cause too many issues on some systems.
const ENABLE_WORKERS = false

const ExtractOpts = figgyPudding({
  log: {},
  dirPacker: {}
})

module.exports = {
  startWorkers () {
    if (ENABLE_WORKERS) {
      if (!workerFarm) { workerFarm = require('worker-farm') }
      this._workers = workerFarm({
        maxConcurrentCallsPerWorker: 20,
        maxRetries: 1
      }, WORKER_PATH)
    }
  },

  stopWorkers () {
    if (ENABLE_WORKERS) {
      if (!workerFarm) { workerFarm = require('worker-farm') }
      workerFarm.end(this._workers)
    }
  },

  child (name, child, childPath, opts) {
    opts = ExtractOpts(opts)
    const spec = npa.resolve(name, child.version)
    let childOpts = opts.concat({
      integrity: child.integrity,
      resolved: child.resolved
    })
    const args = [spec, childPath, childOpts]
    return BB.fromNode((cb) => {
      let launcher = extractionWorker
      let msg = args
      const spec = typeof args[0] === 'string' ? npa(args[0]) : args[0]
      if (ENABLE_WORKERS && (spec.registry || spec.type === 'remote')) {
        if (!workerFarm) { workerFarm = require('worker-farm') }
        // We can't serialize these options
        childOpts = childOpts.concat({
          log: null,
          dirPacker: null
        })
        // workers will run things in parallel!
        launcher = this._workers
        try {
          msg = JSON.stringify(msg)
        } catch (e) {
          return cb(e)
        }
      }
      launcher(msg, cb)
    })
  }
}