The first example - a centralized system for event notification

In our first example, we are going to implement a system to send items from generators of events to consumers of events. We're going to use the SubmissionPublisher class to implement the communication between the producers and the consumers of events.

The Event class

This class stores the information of every item. Each item contains three attributes:

• The msg attribute, to store a message in the Event
• The source attribute, to store the name of the class that produces the Event
• The date attribute, to store the date when the Event was produced

You have to declare the three attributes as private and include the methods to get() and set() the values of the attributes in the class.

The Producer class

We're going to use this class to implement tasks that generate events that will be sent to the consumers using a SubmissionPublisher object. The class implements the Runnable interface and stores two attributes:

• The publisher attribute, that...