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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 | 4x 4x 1x 1x 1x 1x 1x 1x 4x 134x 134x 134x 134x 134x 135x 135x 135x 134x 134x 1x 1x 134x 4x | // at-most-once.js -- run a function at most once
//
// Copyright 2016 fuzzy.ai <evan@fuzzy.ai>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/* jshint esversion: 6 */
'use strict'
const debug = require('debug')('vows:at-most-once')
const assert = require('./assert')
class AtMostOnceError extends Error {
constructor (name, called) {
const message = `${name} wrapper called ${called} times!`
super(message)
this.message = message
this.functionName = name
this.called = called
this.name = 'AtMostOnceError'
}
}
const atMostOnce = function (fn) {
let called = 0
assert.isFunction(fn)
const name = (fn.name) ? `${fn.name}()` : '<anonymous function>'
debug(`Creating atMostOnce() wrapper for ${name}`)
const wrapper = function () {
const args = Array.prototype.slice.call(arguments)
called += 1
if (called === 1) {
debug(`First call of atMostOnce() wrapper of ${name}`)
return fn.apply(null, args)
} else {
debug(`call number ${called} of atMostOnce() wrapper of ${name}`)
throw new AtMostOnceError(name, called)
}
}
return wrapper
}
module.exports = atMostOnce
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