Exercise 4

app/app/pom.xml

@@ -19,6 +19,10 @@
             <groupId>com.workshop</groupId>
             <artifactId>library-spring-boot-starter</artifactId>
         </dependency>
+        <dependency>
+            <groupId>com.workshop</groupId>
+            <artifactId>library-slf4j</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>

components/library-autoconfigure/pom.xml

@@ -24,6 +24,11 @@
             <artifactId>library-stdout</artifactId>
             <optional>true</optional>
         </dependency>
+        <dependency>
+            <groupId>com.workshop</groupId>
+            <artifactId>library-slf4j</artifactId>
+            <optional>true</optional>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-autoconfigure</artifactId>

components/library-autoconfigure/src/main/java/com/workshop/magic/config/GreetingAutoConfiguration.java

@@ -1,11 +1,13 @@
 package com.workshop.magic.config;
 
 import com.workshop.magic.service.GreetingService;
+import com.workshop.magic.service.slf4j.LoggerGreetingService;
 import com.workshop.magic.service.stdout.StdOutGreetingService;
 
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
 import org.springframework.context.annotation.Bean;
 
 @AutoConfiguration
@@ -15,8 +17,16 @@ public class GreetingAutoConfiguration {
     @Bean
     @ConditionalOnMissingBean
     @ConditionalOnClass(StdOutGreetingService.class)
+    @ConditionalOnMissingClass("com.workshop.magic.service.slf4j.LoggerGreetingService")
     GreetingService stdOutGreetingService() {
         return new StdOutGreetingService();
     }
 
+    @Bean
+    @ConditionalOnMissingBean
+    @ConditionalOnClass(LoggerGreetingService.class)
+    GreetingService slf4jGreetingService() {
+        return new LoggerGreetingService();
+    }
+
 }