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拓海 e47f4a5c5d
葛苏林的救赎x2
10 months ago
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LICENSE 葛苏林的救赎x2 10 months ago
README.md 葛苏林的救赎x2 10 months ago
inflight.js 葛苏林的救赎x2 10 months ago
package.json 葛苏林的救赎x2 10 months ago

README.md

inflight

Add callbacks to requests in flight to avoid async duplication

USAGE

var inflight = require('inflight')

// some request that does some stuff
function req(key, callback) {
  // key is any random string.  like a url or filename or whatever.
  //
  // will return either a falsey value, indicating that the
  // request for this key is already in flight, or a new callback
  // which when called will call all callbacks passed to inflightk
  // with the same key
  callback = inflight(key, callback)

  // If we got a falsey value back, then there's already a req going
  if (!callback) return

  // this is where you'd fetch the url or whatever
  // callback is also once()-ified, so it can safely be assigned
  // to multiple events etc.  First call wins.
  setTimeout(function() {
    callback(null, key)
  }, 100)
}

// only assigns a single setTimeout
// when it dings, all cbs get called
req('foo', cb1)
req('foo', cb2)
req('foo', cb3)
req('foo', cb4)