What should be done if multiple Block instances are to handle the same event?

When multiple Block instances are intended to handle the same event, utilizing the same handler for all instances is the most efficient and effective approach. This method promotes consistency in how the event is processed across different instances and reduces redundancy in code. By having a shared event handler, any updates or changes to the event logic need to be made in just one place, ensuring that all instances react to the event in the same way. This not only streamlines maintenance but also ensures that the codebase remains cleaner and easier to understand.

The other options would introduce unnecessary complexity. Defining a new event for each instance would result in duplicated logic, making it harder to manage. Restricting one instance to handle events only contradicts the purpose of having multiple instances designed to respond to the same events. Merging instances could simplify the design in some situations, but it may negate the individual functionalities that the separate instances might serve, leading to a loss of flexibility and modularity in the application. Thus, using the same handler across multiple Block instances is the optimal solution for handling shared events.