#35 springboot: external read - @ConfigurationProperties validate

springboot/external-read/build.gradle

@@ -20,6 +20,8 @@ repositories {
 
 dependencies {
     implementation 'org.springframework.boot:spring-boot-starter'
+    implementation 'org.springframework.boot:spring-boot-starter-validation'
+
     compileOnly 'org.projectlombok:lombok'
     annotationProcessor 'org.projectlombok:lombok'
     testImplementation 'org.springframework.boot:spring-boot-starter-test'

springboot/external-read/src/main/java/hello/ExternalReadApplication.java

@@ -2,6 +2,7 @@ package hello;
 
 import hello.config.MyDataSourceConfigV1;
 import hello.config.MyDataSourceConfigV2;
+import hello.config.MyDataSourceConfigV3;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
 import org.springframework.boot.context.properties.ConfigurationPropertiesScan;
@@ -10,7 +11,8 @@ import org.springframework.context.annotation.Import;
 //@Import(MyDataSourceEnvConfig.class)
 //@Import(MyDataSourceValueConfig.class)
 //@Import(MyDataSourceConfigV1.class)
-@Import(MyDataSourceConfigV2.class)
+//@Import(MyDataSourceConfigV2.class)
+@Import(MyDataSourceConfigV3.class)
 @SpringBootApplication(scanBasePackages = "hello.datasource")
 @ConfigurationPropertiesScan
 public class ExternalReadApplication {

springboot/external-read/src/main/java/hello/config/MyDataSourceConfigV3.java

@@ -0,0 +1,28 @@
+package hello.config;
+
+import hello.datasource.MyDataSource;
+import hello.datasource.MyDatasourcePropertiesV3;
+import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+
+@Slf4j
+@RequiredArgsConstructor
+@EnableConfigurationProperties(MyDatasourcePropertiesV3.class)
+public class MyDataSourceConfigV3 {
+
+    private final MyDatasourcePropertiesV3 properties;
+
+    @Bean
+    public MyDataSource dataSource() {
+        return new MyDataSource(
+                properties.getUrl(),
+                properties.getUsername(),
+                properties.getPassword(),
+                properties.getEtc().getMaxConnection(),
+                properties.getEtc().getTimeout(),
+                properties.getEtc().getOptions()
+        );
+    }
+}

springboot/external-read/src/main/java/hello/datasource/MyDatasourcePropertiesV3.java

@@ -0,0 +1,54 @@
+package hello.datasource;
+
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotEmpty;
+import lombok.Getter;
+import org.hibernate.validator.constraints.time.DurationMax;
+import org.hibernate.validator.constraints.time.DurationMin;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.boot.context.properties.bind.DefaultValue;
+import org.springframework.validation.annotation.Validated;
+
+import java.time.Duration;
+import java.util.List;
+
+@Getter
+@ConfigurationProperties("my.datasource")
+@Validated
+public class MyDatasourcePropertiesV3 {
+
+    @NotEmpty
+    private String url;
+    @NotEmpty
+    private String username;
+    @NotEmpty
+    private String password;
+    private Etc etc;
+
+    public MyDatasourcePropertiesV3(String url, String username, String password, Etc etc) {
+        this.url = url;
+        this.username = username;
+        this.password = password;
+        this.etc = etc;
+    }
+
+    @Getter
+    public static class Etc {
+
+        @Min(1)
+        @Max(999)
+        private int maxConnection;
+
+        @DurationMin(seconds = 1)
+        @DurationMax(seconds = 60)
+        private Duration timeout;
+        private List<String> options;
+
+        public Etc(int maxConnection, Duration timeout, @DefaultValue("DEFAULT") List<String> options) {
+            this.maxConnection = maxConnection;
+            this.timeout = timeout;
+            this.options = options;
+        }
+    }
+}

springboot/external-read/src/main/resources/application.properties

@@ -1,6 +1,6 @@
 my.datasource.url=local.db.com
 my.datasource.username=username
 my.datasource.password=password
-#my.datasource.etc.max-connection=1
-#my.datasource.etc.timeout=3500ms
-#my.datasource.etc.options=CACHE,ADMIN
+my.datasource.etc.max-connection=1
+my.datasource.etc.timeout=3500ms
+my.datasource.etc.options=CACHE,ADMIN