Interface that should be implemented to receive trigger change callbacks from the TriggerProvider

A trivial implementation of TriggerListener would be:

// A caplin.streamlink.alerts.TriggerListener that can handle
// every possible callback.
//
// This trivial implementation just logs the callbacks
//


var triggerService = new caplin.streamlink.alerts.TriggerService(streamlink);

triggerService.addListener(
{
        onTriggerUpdated: function(trigger)
        {
                console.log("onTriggerUpdated(" + trigger.toString() + ")");
        },
        
        onTriggerAdded: function(trigger)
        {
                console.log("onTriggerAdded(" + trigger.toString() + ")");
        },
        
        onTriggerRemoved: function(trigger)
        {
                console.log("onTriggerRemoved(" + trigger.toString() + ")");
        },
        
        onServiceStatus: function(status)
        {
                console.log("onServiceStatus(" + status + ")");
        }
});