docs: service locator and service stub diagrams

Author: iluwatar

Diff for: service-layer/README.md

@@ -40,7 +40,6 @@ Architecture diagram
 
 ![Service Layer Architecture Diagram](./etc/service-layer-architecture-diagram.png)
 
-
 ## Programmatic Example of Service Layer Pattern in Java
 
 Our Java implementation uses the Service Layer pattern to streamline interactions between data access objects (DAOs) and the business logic, ensuring a clean separation of concerns.
@@ -358,10 +357,6 @@ INFO  [2024-05-27 09:16:40,681] com.iluwatar.servicelayer.app.App: Find wizards
 INFO  [2024-05-27 09:16:40,683] com.iluwatar.servicelayer.app.App: Aderlard Boud has 'Fireball'
 ```
 
-## Detailed Explanation of Service Layer Pattern with Real-World Examples
-
-![Service Layer](./etc/service-layer.png "Service Layer")
-
 ## When to Use the Service Layer Pattern in Java
 
 * Use when you need to separate business logic from presentation logic.

Diff for: service-locator/README.md

@@ -33,6 +33,10 @@ Wikipedia says
 
 > The service locator pattern is a design pattern used in software development to encapsulate the processes involved in obtaining a service with a strong abstraction layer. This pattern uses a central registry known as the "service locator", which on request returns the information necessary to perform a certain task. Proponents of the pattern say the approach simplifies component-based applications where all dependencies are cleanly listed at the beginning of the whole application design, consequently making traditional dependency injection a more complex way of connecting objects. Critics of the pattern argue that it is an antipattern which obscures dependencies and makes software harder to test.
 
+Sequence diagram
+
+![Service Locator sequence diagram](./etc/service-locator-sequence-diagram.png)
+
 ## Programmatic Example of Service Locator Pattern in Java
 
 The Service Locator design pattern is used to abstract the processes involved in obtaining a service. It uses a central registry, the "service locator", which returns the necessary information to perform a task upon request. This Java design pattern is particularly useful in enterprise Java applications where services need centralized management.

Diff for: service-locator/etc/service-locator-sequence-diagram.png

@@ -34,6 +34,10 @@ Wikipedia says
 
 > A test stub is a dummy component used during testing to isolate behavior.
 
+Sequence diagram
+
+![Service Stub sequence diagram](./etc/service-stub-sequence-diagram.png)
+
 ## Programmatic Example of Service Stub Pattern in Java
 
 We define a `SentimentAnalysisService` interface and provide two implementations: