sawtooth-sdk/messaging/deferred.js

An SDK for interacting with the Hyperledger Sawtooth distributed ledger.

/**
 * Copyright 2017 Intel Corporation
 *
 * 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.
 * ------------------------------------------------------------------------------
 */

'use strict'

function Deferred () {
  if (Promise.defer) {
    return Promise.defer()
  } else {
    this.resolve = null
    this.reject = null

    this.promise = new Promise((resolve, reject) => {
      this.resolve = resolve
      this.reject = reject
    })

    Object.freeze(this)
  }
}

module.exports = Deferred