Saiku query fetch

I'm new to saiku and backbone. I'm trying to figure out how ChartPlus highcharts work in Saiku and have integrated Saiku in Pentaho. I have downloaded the source code, been going through the code and trying to figure out how the database is being hit to generate the charts. I found the below event for fetching the query but unable to find where it is defined and how it is getting called.

   this.workspace.trigger('query:fetch');

Can anyone help out by telling how this works?

You can install Saiku CE and Saiku Chart Plus using Pentaho Marketplace or you can build the Saiku source and put in folder in pentaho-solutions and restart server.

The code that you spoke, you can see the event created here: https://github.com/OSBI/saiku/blob/master/saiku-ui/js/saiku/models/Query.js#L135

Trigger callbacks for the given event, or space-delimited list of events. Subsequent arguments to trigger will be passed along to the event callbacks.

You could catch it using:

var MyClass = Backbone.View.extend({
  initialize: function(args) {
    // Keep track of parent workspace
    this.workspace = args.workspace;

    // Maintain `this` in callbacks
    _.bindAll(this, 'receive_data', 'workspace_levels');

    // Listen to result event
    this.workspace.bind('query:fetch', this.receive_data);
  },

  receive_data: function(args) {
    console.log(args);
  },
});