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docs: add diagrams for event aggregator, event-based asynchronous, event queue, execute around, extension objects

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Ilkka Seppälä
2025-04-06 18:36:32 +03:00
parent 30d13083ae
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event-aggregator/README.md
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> Event Aggregator is a design pattern that allows multiple event sources to communicate with event handlers through a central point, rather than having each event source communicate directly with each handler.
Sequence diagram
![Event Aggregator sequence diagram](./etc/event-aggregator-sequence-diagram.png)
## Programmatic Example of Event Aggregator Pattern in Java
Consider the following example where we use the Event Aggregator to handle multiple events.
@@ -161,10 +165,6 @@ The console output after running the example.
21:37:38.739 [main] INFO com.iluwatar.event.aggregator.KingJoffrey -- Received event from the King's Hand: Traitor detected
```
## Detailed Explanation of Event Aggregator Pattern with Real-World Examples
![Event Aggregator](./etc/classes.png "Event Aggregator")
## When to Use the Event Aggregator Pattern in Java
Use the Event Aggregator pattern when
event-aggregator/etc/event-aggregator-sequence-diagram.png
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