Question

Please explain event source object, event object, and event handler object as well as the relationship among them. Thanks.

Answer 1

Answer)

Event Source Object: The EventSource interface is defined as the web content's interface till the server sent events where the EventSourceInstance which opens the persistent connection to the HTTP Server wherein the events are being sent to the text/event-stream format.

The connection remains open until it gets closed by calling the EventSource close(). It is when the connection gets opened, the incoming messages from among the server gets delivered to the code in the form of message events.

Event Object: It is the root class from where all the event state object which are derived. All the events which are constructed are made with a reference to the concerned object to the sources which are being referenced.

Event Handler Object: When considering runtime execution, the event which happens on an object which has the Java Tag set, The message gets sent to the class which is serving the object's event handler where the event handler will then perform the action for the programmed event.

The relation between then is event listener object listens for any specific type of the events which gets generated by the event source in the program where the event handler is a method which gets called as a response to the specific type of the event,

If you found the answer useful, hit like
Hope this answer helps.
Thanks