decorator as advice

biz.js

import Service from './Service';
import {log} from './decorator';
// May use https://github.com/jayphelps/core-decorators.js
import {deprecate, throttle} from 'core-decorators';
import {forClass} from 'aop';

let MyService = forClass(
  Service,
  {
    aspects: [
      {
        matches: {regex: /^fetch[A-Z]/},
        advices: [throttle(250), log] // Throggle first, then log every invocation
      },
      // Deprecate all old getXxx methods
      {
        matches: {regex: /^get[A-Z]/},
        advice: [deprecated]
      }
    ]
  }
);

let service = new MyService();
service.fetchUserAccount();
// ...

decorator.js

export function log(target, key, descriptor) {
  let method = descriptor.value;
  descriptor.value = function (...args) {
    console.log('calling: ', key, args);
    
    try {
      let returnValue = method.apply(this, args);
      console.log('returning: ', key, returnValue);
      return returnValue;
    }
    catch (ex) {
      console.log('throwing: ', key, ex);
    }
  }
}