Bael 1674 (#4335)

* Handle events - BAEL - 1674

* BAEL -1674 - test

* test - BAEL-1674

* Change system.out to logger

* minor change

spring-data-rest/src/main/java/com/baeldung/config/MvcConfig.java

@@ -1,5 +1,7 @@
 package com.baeldung.config;
 
+import com.baeldung.events.AuthorEventHandler;
+import com.baeldung.events.BookEventHandler;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
@@ -22,4 +24,14 @@ public class MvcConfig extends WebMvcConfigurerAdapter{
         configurer.enable();
     }
 
+    @Bean
+    AuthorEventHandler authorEventHandler() {
+        return new AuthorEventHandler();
+    }
+
+    @Bean
+    BookEventHandler bookEventHandler(){
+        return new BookEventHandler();
+    }
+
 }

spring-data-rest/src/main/java/com/baeldung/events/AuthorEventHandler.java

@@ -0,0 +1,40 @@
+package com.baeldung.events;
+
+import com.baeldung.models.Author;
+import com.baeldung.models.Book;
+import org.springframework.data.rest.core.annotation.*;
+
+import java.util.logging.Logger;
+
+@RepositoryEventHandler
+public class AuthorEventHandler {
+        Logger logger = Logger.getLogger("Class AuthorEventHandler");
+        public AuthorEventHandler(){
+                super();
+        }
+
+        @HandleBeforeCreate
+        public void handleAuthorBeforeCreate(Author author){
+                logger.info("Inside  Author Before Create....");
+                String name = author.getName();
+        }
+
+        @HandleAfterCreate
+        public void handleAuthorAfterCreate(Author author){
+                logger.info("Inside  Author After Create ....");
+                String name = author.getName();
+        }
+
+        @HandleBeforeDelete
+        public void handleAuthorBeforeDelete(Author author){
+                logger.info("Inside  Author Before Delete ....");
+                String name = author.getName();
+        }
+
+        @HandleAfterDelete
+        public void handleAuthorAfterDelete(Author author){
+                logger.info("Inside  Author After Delete ....");
+                String name = author.getName();
+        }
+
+}

spring-data-rest/src/main/java/com/baeldung/events/BookEventHandler.java

@@ -0,0 +1,26 @@
+package com.baeldung.events;
+
+import java.util.logging.Logger;
+import com.baeldung.models.Author;
+import com.baeldung.models.Book;
+import org.apache.commons.logging.Log;
+import org.springframework.data.rest.core.annotation.HandleAfterDelete;
+import org.springframework.data.rest.core.annotation.HandleBeforeCreate;
+import org.springframework.data.rest.core.annotation.RepositoryEventHandler;
+
+@RepositoryEventHandler
+public class BookEventHandler {
+        Logger logger = Logger.getLogger("Class BookEventHandler");
+        @HandleBeforeCreate
+        public void handleBookBeforeCreate(Book book){
+
+                logger.info("Inside Book Before Create ....");
+                book.getAuthors();
+        }
+
+        @HandleBeforeCreate
+        public void handleAuthorBeforeCreate(Author author){
+                logger.info("Inside Author Before Create ....");
+                author.getBooks();
+        }
+}

spring-data-rest/src/test/java/com/baeldung/events/AuthorEventHandlerTest.java

@@ -0,0 +1,29 @@
+package com.baeldung.events;
+
+import com.baeldung.models.Author;
+import org.junit.Test;
+import org.mockito.Mockito;
+import org.springframework.data.rest.core.annotation.RepositoryEventHandler;
+
+import static org.mockito.Mockito.mock;
+
+public class AuthorEventHandlerTest {
+
+        @Test
+        public void whenCreateAuthorThenSuccess() {
+                Author author = mock(Author.class);
+                AuthorEventHandler authorEventHandler = new AuthorEventHandler();
+                authorEventHandler.handleAuthorBeforeCreate(author);
+                Mockito.verify(author,Mockito.times(1)).getName();
+
+        }
+
+        @Test
+        public void whenDeleteAuthorThenSuccess() {
+                Author author = mock(Author.class);
+                AuthorEventHandler authorEventHandler = new AuthorEventHandler();
+                authorEventHandler.handleAuthorAfterDelete(author);
+                Mockito.verify(author,Mockito.times(1)).getName();
+
+        }
+}

spring-data-rest/src/test/java/com/baeldung/events/BookEventHandlerTest.java

@@ -0,0 +1,28 @@
+package com.baeldung.events;
+
+import com.baeldung.models.Author;
+import com.baeldung.models.Book;
+import org.junit.Test;
+import org.mockito.Mockito;
+
+import static org.mockito.Mockito.mock;
+
+public class BookEventHandlerTest {
+        @Test
+        public void whenCreateBookThenSuccess() {
+                Book book = mock(Book.class);
+                BookEventHandler bookEventHandler = new BookEventHandler();
+                bookEventHandler.handleBookBeforeCreate(book);
+                Mockito.verify(book,Mockito.times(1)).getAuthors();
+
+        }
+
+        @Test
+        public void whenCreateAuthorThenSuccess() {
+                Author author = mock(Author.class);
+                BookEventHandler bookEventHandler = new BookEventHandler();
+                bookEventHandler.handleAuthorBeforeCreate(author);
+                Mockito.verify(author,Mockito.times(1)).getBooks();
+
+        }
+}