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1'use strict'2 3const NumberAllocator = require('number-allocator').NumberAllocator4 5/**6 * UniqueMessageAllocator constructor7 * @constructor8 */9function UniqueMessageIdProvider () {10  if (!(this instanceof UniqueMessageIdProvider)) {11    return new UniqueMessageIdProvider()12  }13 14  this.numberAllocator = new NumberAllocator(1, 65535)15}16 17/**18 * allocate19 *20 * Get the next messageId.21 * @return if messageId is fully allocated then return null,22 *         otherwise return the smallest usable unsigned int messageId.23 */24UniqueMessageIdProvider.prototype.allocate = function () {25  this.lastId = this.numberAllocator.alloc()26  return this.lastId27}28 29/**30 * getLastAllocated31 * Get the last allocated messageId.32 * @return unsigned int33 */34UniqueMessageIdProvider.prototype.getLastAllocated = function () {35  return this.lastId36}37 38/**39 * register40 * Register messageId. If success return true, otherwise return false.41 * @param { unsigned int } - messageId to register,42 * @return boolean43 */44UniqueMessageIdProvider.prototype.register = function (messageId) {45  return this.numberAllocator.use(messageId)46}47 48/**49 * deallocate50 * Deallocate messageId.51 * @param { unsigned int } - messageId to deallocate,52 */53UniqueMessageIdProvider.prototype.deallocate = function (messageId) {54  this.numberAllocator.free(messageId)55}56 57/**58 * clear59 * Deallocate all messageIds.60 */61UniqueMessageIdProvider.prototype.clear = function () {62  this.numberAllocator.clear()63}64 65module.exports = UniqueMessageIdProvider66