fix(core): hard dependency on devtools (#26) (#31)

ViewComponentAutoConfiguration checks both local-development property and spring-dev-tools in classpath now.

Author: Clickin

core/build.gradle.kts

@@ -25,7 +25,7 @@ repositories {
 dependencies {
     implementation("org.springframework.boot:spring-boot-starter-web")
     implementation("org.springframework.boot:spring-boot-starter-aop")
-    implementation("org.springframework.boot:spring-boot-devtools")
+    compileOnly("org.springframework.boot:spring-boot-devtools")
     implementation("io.projectreactor:reactor-core")
     implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
     implementation("org.jetbrains.kotlin:kotlin-reflect")

core/src/main/kotlin/de/tschuehly/spring/viewcomponent/core/ViewComponentAutoConfiguration.kt

@@ -1,16 +1,16 @@
 package de.tschuehly.spring.viewcomponent.core
 
-import de.tschuehly.spring.viewcomponent.core.component.ViewComponent
 import de.tschuehly.spring.viewcomponent.core.component.ViewComponentProperties
+import de.tschuehly.spring.viewcomponent.core.condition.DevToolsExistsCondition
 import de.tschuehly.spring.viewcomponent.core.processor.ViewComponentChangeListener
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
-import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty
 import org.springframework.boot.context.properties.EnableConfigurationProperties
 import org.springframework.boot.devtools.filewatch.FileSystemWatcher
 import org.springframework.context.ApplicationContext
 import org.springframework.context.annotation.Bean
 import org.springframework.context.annotation.ComponentScan
+import org.springframework.context.annotation.Conditional
 import org.springframework.context.annotation.Configuration
 import java.io.File
 
@@ -20,7 +20,7 @@ import java.io.File
 class ViewComponentAutoConfiguration {
 
     @Configuration
-    @ConditionalOnProperty("spring.view-component.local-development")
+    @Conditional(DevToolsExistsCondition::class)
     class LocalDevConfig {
         val logger: Logger = LoggerFactory.getLogger(LocalDevConfig::class.java)
 

core/src/main/kotlin/de/tschuehly/spring/viewcomponent/core/condition/DevToolsExistsCondition.kt

@@ -0,0 +1,23 @@
+package de.tschuehly.spring.viewcomponent.core.condition
+
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import org.springframework.context.annotation.Condition
+import org.springframework.context.annotation.ConditionContext
+import org.springframework.core.type.AnnotatedTypeMetadata
+
+class DevToolsExistsCondition: Condition {
+    private val logger : Logger = LoggerFactory.getLogger(DevToolsExistsCondition::class.java)
+    override fun matches(context: ConditionContext, metadata: AnnotatedTypeMetadata): Boolean {
+        val isLocalDevelopment = context.environment.getProperty("spring.view-component.local-development").toBoolean()
+        val isDevToolsExists = try {
+            Class.forName("org.springframework.boot.devtools.restart.Restarter", false, context.classLoader)
+            true
+        } catch (e: ClassNotFoundException) {
+            logger.error("In order to use hot-reload function, spring-dev-tools needed")
+            false
+        }
+
+        return isLocalDevelopment && isDevToolsExists
+    }
+}