Interactions between a service and a directive: interdependence or triggering of events

Issue: managing multiple directives that interact with a service or factory to communicate and log actions with a server. Should I establish dependencies between them?

angular.module('someModule', [])
    .directive('someDir', ['logger', function ( logger ) {
        //...
    }])

    .service('logger', ['$http', function( $http ){
        //...
    }]);

or should I opt for event-based relationships?

angular.module('someModule', [])
    .directive('someDir', ['$rootScope', function ( $rootScope ) {
        $rootScope.$emit('someEvent');
        // ...
    }])

    .service('logger', ['$http', '$rootScope', function( $http, $rootScope ){
        $rootScope.$on('someEvent', function(){
            // ...
        });
        // ...
    }]);

What are the advantages and disadvantages besides decoupling?

Answer №1

Utilizing eventing offers several advantages:

  • One key benefit is decoupling, as previously mentioned.
  • Events provide the flexibility to add additional subscribers in the future. For instance, if you need to not only log something but also perform another action when someEvent occurs, you can simply create a new subscriber to handle this new scenario.

Despite its benefits, eventing also comes with some drawbacks:

  • Execution becomes non-linear, making debugging more challenging. Having too many events can turn debugging into a nightmare.
  • This lack of linearity can also impact code readability, as it may be difficult to ascertain what exactly is happening by just looking at sections of the code.
  • Relying on the order of execution for events is not recommended. If ordered execution is necessary, eventing may not be the best solution.

I personally utilize eventing for handling scenarios that are not part of the main process flow. Logging serves as a prime example of such a feature.

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