What pattern to use when designing multiple search?

Question

PHP

Hello.
I am writing a search engine that will search for products in several databases and return the search result. The trick is that product catalogs have different fields (that's right!), but as a result, you need to display everything in the same structure. Sql queries are useless, they have nothing to do with it.
Help is needed only in choosing a pattern.

Answer 1

The Adapter pattern allows the design process to ignore possible differences in the interfaces of existing classes. If there is a class that has the required methods and properties (at least conceptually), then if necessary, you can always use the Adapter pattern to bring its interface to the desired form.

https://ru.wikipedia.org/wiki/Adapter_(project_template...

Answer 2

json, xml?

Answer 3

setTimeout ? ;-)

var now = +new Date();
console.log(now);

setTimeout(function() {
    var future = +new Date();
    console.log(future);
}, 5000); // Время в милисекундах, 1 сек = 1000 мсек

Time from timestamp to what format you need, I think you will translate it yourself :-)

Answer 4

Is that a plugin?

function timer (delta, step) {
  var count = 0;

  (function t () {
    if (count < step) {
      console.log(count);
      count++;
      setTimeout(t, delta);
    } else {
      console.log(count, 'end');
    }
  })();
}

timer(1000, 5);

Answer 5

.factory('countdown', function($q, $interval) {
  return function(to) {
      var d = $q.defer();
      var elapsed = 0;
      var intervalId = $interval(function() {
          elapsed += 1;
          d.notify(elapsed);
          if(Date.now() >= to) {
            $interval.cancel(intervalId);
            d.resolve();    
          }    
      }, 1000); 
      return d.promise;
  };
});

Answer 6

If the accuracy is not important, then you can use the options given above
For after a few hours without reloading the page, the timer will lag behind for a time from one second to several minutes. Depends on the computer.
And if you need accuracy, then be sure to check against the current timestamp and adjust setInterval.