From eac28eb90f89acc2be018013ac31348ec64705b9 Mon Sep 17 00:00:00 2001
From: azhwani <>
Date: Mon, 17 Aug 2020 15:12:50 +0100
Subject: [PATCH] first commit

---
 .../NotificationApplication.java              | 12 +++++++++
 .../config/NotificationConfig.java            | 26 ++++++++++++++++++
 .../service/EmailNotification.java            | 10 +++++++
 .../service/NotificationSender.java           |  5 ++++
 .../service/SmsNotification.java              | 10 +++++++
 .../src/main/resources/application.properties |  2 ++
 .../NotificationUnitTest.java                 | 27 +++++++++++++++++++
 7 files changed, 92 insertions(+)
 create mode 100644 spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/NotificationApplication.java
 create mode 100644 spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/config/NotificationConfig.java
 create mode 100644 spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/EmailNotification.java
 create mode 100644 spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/NotificationSender.java
 create mode 100644 spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/SmsNotification.java
 create mode 100644 spring-boot-modules/spring-boot-autoconfiguration/src/test/java/com/baeldung/conditionalonproperty/NotificationUnitTest.java

diff --git a/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/NotificationApplication.java b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/NotificationApplication.java
new file mode 100644
index 0000000000..977de5534d
--- /dev/null
+++ b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/NotificationApplication.java
@@ -0,0 +1,12 @@
+package com.baeldung.conditionalonproperty;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class NotificationApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(NotificationApplication.class, args);
+    }
+}
diff --git a/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/config/NotificationConfig.java b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/config/NotificationConfig.java
new file mode 100644
index 0000000000..ffd942cd02
--- /dev/null
+++ b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/config/NotificationConfig.java
@@ -0,0 +1,26 @@
+package com.baeldung.conditionalonproperty.config;
+
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+import com.baeldung.conditionalonproperty.service.EmailNotification;
+import com.baeldung.conditionalonproperty.service.NotificationSender;
+import com.baeldung.conditionalonproperty.service.SmsNotification;
+
+@Configuration
+public class NotificationConfig {
+
+    @Bean(name = "emailNotification")
+    @ConditionalOnProperty(prefix = "notification", name = "service", havingValue = "email")
+    public NotificationSender notificationSender() {
+        return new EmailNotification();
+    }
+
+    @Bean(name = "smsNotification")
+    @ConditionalOnProperty(prefix = "notification", name = "service", havingValue = "sms")
+    public NotificationSender notificationSender2() {
+        return new SmsNotification();
+    }
+
+}
diff --git a/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/EmailNotification.java b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/EmailNotification.java
new file mode 100644
index 0000000000..c66800f817
--- /dev/null
+++ b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/EmailNotification.java
@@ -0,0 +1,10 @@
+package com.baeldung.conditionalonproperty.service;
+
+public class EmailNotification implements NotificationSender {
+
+    @Override
+    public String send(String message) {
+        return "Email Notification: " + message;
+    }
+
+}
diff --git a/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/NotificationSender.java b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/NotificationSender.java
new file mode 100644
index 0000000000..945306e7c4
--- /dev/null
+++ b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/NotificationSender.java
@@ -0,0 +1,5 @@
+package com.baeldung.conditionalonproperty.service;
+
+public interface NotificationSender {
+    String send(String message);
+}
diff --git a/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/SmsNotification.java b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/SmsNotification.java
new file mode 100644
index 0000000000..dcf611da19
--- /dev/null
+++ b/spring-boot-modules/spring-boot-autoconfiguration/src/main/java/com/baeldung/conditionalonproperty/service/SmsNotification.java
@@ -0,0 +1,10 @@
+package com.baeldung.conditionalonproperty.service;
+
+public class SmsNotification implements NotificationSender {
+
+    @Override
+    public String send(String message) {
+        return "SMS notification: " + message;
+    }
+
+}
diff --git a/spring-boot-modules/spring-boot-autoconfiguration/src/main/resources/application.properties b/spring-boot-modules/spring-boot-autoconfiguration/src/main/resources/application.properties
index 4456c78e5d..03f753abf9 100644
--- a/spring-boot-modules/spring-boot-autoconfiguration/src/main/resources/application.properties
+++ b/spring-boot-modules/spring-boot-autoconfiguration/src/main/resources/application.properties
@@ -1,2 +1,4 @@
 spring.jpa.show-sql=true
 spring.jpa.hibernate.ddl-auto = update
+
+notification.service=email
diff --git a/spring-boot-modules/spring-boot-autoconfiguration/src/test/java/com/baeldung/conditionalonproperty/NotificationUnitTest.java b/spring-boot-modules/spring-boot-autoconfiguration/src/test/java/com/baeldung/conditionalonproperty/NotificationUnitTest.java
new file mode 100644
index 0000000000..fb9b177e5f
--- /dev/null
+++ b/spring-boot-modules/spring-boot-autoconfiguration/src/test/java/com/baeldung/conditionalonproperty/NotificationUnitTest.java
@@ -0,0 +1,27 @@
+package com.baeldung.conditionalonproperty;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+
+import com.baeldung.conditionalonproperty.config.NotificationConfig;
+import com.baeldung.conditionalonproperty.service.EmailNotification;
+import com.baeldung.conditionalonproperty.service.NotificationSender;
+
+public class NotificationUnitTest {
+
+    private final ApplicationContextRunner contextRunner = new ApplicationContextRunner();
+
+    @Test
+    public void whenValueSetToEmail_thenCreateEmailNotification() {
+        this.contextRunner.withPropertyValues("notification.service=email")
+            .withUserConfiguration(NotificationConfig.class)
+            .run(context -> {
+                assertThat(context).hasBean("emailNotification");
+                NotificationSender notificationSender = context.getBean(EmailNotification.class);
+                assertThat(notificationSender.send("Hello From Baeldung!")).isEqualTo("Email Notification: Hello From Baeldung!");
+                assertThat(context).doesNotHaveBean("smsNotification");
+            });
+    }
+}