Remove reflections lib in favor of ClassGraph

graphql-kotlin-federation/pom.xml

@@ -33,6 +33,10 @@
             <artifactId>graphql-kotlin-schema-generator</artifactId>
             <version>${project.parent.version}</version>
         </dependency>
+        <dependency>
+            <groupId>io.github.classgraph</groupId>
+            <artifactId>classgraph</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter-params</artifactId>

graphql-kotlin-federation/src/main/kotlin/com/expediagroup/graphql/federation/FederatedSchemaGenerator.kt

@@ -20,8 +20,9 @@ import com.expediagroup.graphql.TopLevelObject
 import com.expediagroup.graphql.federation.directives.ExtendsDirective
 import com.expediagroup.graphql.generator.SchemaGenerator
 import graphql.schema.GraphQLSchema
-import org.reflections.Reflections
+import io.github.classgraph.ClassGraph
 import kotlin.reflect.full.createType
+import kotlin.reflect.jvm.jvmName
 
 /**
  * Generates federated GraphQL schemas based on the specified configuration.
@@ -41,10 +42,12 @@ open class FederatedSchemaGenerator(generatorConfig: FederatedSchemaGeneratorCon
     /**
      * Scans specified packages for all the federated (extended) types and adds them to the target schema.
      */
+    @Suppress("Detekt.SpreadOperator")
     fun GraphQLSchema.Builder.federation(supportedPackages: List<String>): GraphQLSchema.Builder {
-        supportedPackages
-            .map { pkg -> Reflections(pkg).getTypesAnnotatedWith(ExtendsDirective::class.java).map { it.kotlin } }
-            .flatten()
+        val scanResult = ClassGraph().enableAllInfo().whitelistPackages(*supportedPackages.toTypedArray()).scan()
+
+        scanResult.getClassesWithAnnotation(ExtendsDirective::class.jvmName)
+            .map { it.loadClass().kotlin }
             .map {
                 val graphQLType = if (it.isAbstract) {
                     interfaceType(it)

graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/FederatedSchemaGeneratorTest.kt

@@ -18,12 +18,12 @@ package com.expediagroup.graphql.federation
 
 import com.expediagroup.graphql.TopLevelObject
 import com.expediagroup.graphql.extensions.print
+import com.expediagroup.graphql.federation.data.queries.simple.NestedQuery
+import com.expediagroup.graphql.federation.data.queries.simple.SimpleQuery
 import com.expediagroup.graphql.federation.execution.FederatedTypeRegistry
 import graphql.schema.GraphQLUnionType
 import org.junit.jupiter.api.Assertions.assertEquals
 import org.junit.jupiter.api.Test
-import test.data.queries.simple.NestedQuery
-import test.data.queries.simple.SimpleQuery
 import kotlin.test.assertNotNull
 import kotlin.test.assertTrue
 
@@ -104,7 +104,7 @@ class FederatedSchemaGeneratorTest {
     @Test
     fun `verify can generate federated schema`() {
         val config = FederatedSchemaGeneratorConfig(
-            supportedPackages = listOf("test.data.queries.federated"),
+            supportedPackages = listOf("com.expediagroup.graphql.federation.data.queries.federated"),
             hooks = FederatedSchemaGeneratorHooks(FederatedTypeRegistry())
         )
 
@@ -137,7 +137,7 @@ class FederatedSchemaGeneratorTest {
         """.trimIndent()
 
         val config = FederatedSchemaGeneratorConfig(
-            supportedPackages = listOf("test.data.queries.simple"),
+            supportedPackages = listOf("com.expediagroup.graphql.federation.data.queries.simple"),
             hooks = FederatedSchemaGeneratorHooks(FederatedTypeRegistry())
         )
 
@@ -169,7 +169,7 @@ class FederatedSchemaGeneratorTest {
         """.trimIndent()
 
         val config = FederatedSchemaGeneratorConfig(
-            supportedPackages = listOf("test.data.queries.simple"),
+            supportedPackages = listOf("com.expediagroup.graphql.federation.data.queries.simple"),
             hooks = FederatedSchemaGeneratorHooks(FederatedTypeRegistry())
         )
 

graphql-kotlin-federation/src/test/kotlin/test/data/TestResolvers.kt → graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/data/TestResolvers.kt

@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-package test.data
+package com.expediagroup.graphql.federation.data
 
+import com.expediagroup.graphql.federation.data.queries.federated.Book
+import com.expediagroup.graphql.federation.data.queries.federated.User
 import com.expediagroup.graphql.federation.execution.FederatedTypeResolver
-import test.data.queries.federated.Book
-import test.data.queries.federated.User
 
 internal class BookResolver : FederatedTypeResolver<Book> {
     override suspend fun resolve(representations: List<Map<String, Any>>): List<Book?> {

graphql-kotlin-federation/src/test/kotlin/test/data/TestSchema.kt → graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/data/TestSchema.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package test.data
+package com.expediagroup.graphql.federation.data
 
 import com.expediagroup.graphql.federation.FederatedSchemaGeneratorConfig
 import com.expediagroup.graphql.federation.FederatedSchemaGeneratorHooks
@@ -25,7 +25,7 @@ import graphql.schema.GraphQLSchema
 
 internal fun federatedTestSchema(federatedTypeResolvers: Map<String, FederatedTypeResolver<*>> = emptyMap()): GraphQLSchema {
     val config = FederatedSchemaGeneratorConfig(
-        supportedPackages = listOf("test.data.queries.federated"),
+        supportedPackages = listOf("com.expediagroup.graphql.federation.data.queries.federated"),
         hooks = FederatedSchemaGeneratorHooks(FederatedTypeRegistry(federatedTypeResolvers))
     )
 

graphql-kotlin-federation/src/test/kotlin/test/data/queries/federated/Product.kt → graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/data/queries/federated/Product.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package test.data.queries.federated
+package com.expediagroup.graphql.federation.data.queries.federated
 
 import com.expediagroup.graphql.annotations.GraphQLDirective
 import com.expediagroup.graphql.annotations.GraphQLIgnore

graphql-kotlin-federation/src/test/kotlin/test/data/queries/simple/NestedQuery.kt → graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/data/queries/simple/NestedQuery.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package test.data.queries.simple
+package com.expediagroup.graphql.federation.data.queries.simple
 
 import kotlin.random.Random
 

graphql-kotlin-federation/src/test/kotlin/test/data/queries/simple/SimpleQuery.kt → graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/data/queries/simple/SimpleQuery.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package test.data.queries.simple
+package com.expediagroup.graphql.federation.data.queries.simple
 
 /*
 type Query {

graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/execution/EntityQueryResolverTest.kt

@@ -24,10 +24,10 @@ import io.mockk.every
 import io.mockk.mockk
 import io.mockk.spyk
 import org.junit.jupiter.api.Test
-import test.data.BookResolver
-import test.data.UserResolver
-import test.data.queries.federated.Book
-import test.data.queries.federated.User
+import com.expediagroup.graphql.federation.data.BookResolver
+import com.expediagroup.graphql.federation.data.UserResolver
+import com.expediagroup.graphql.federation.data.queries.federated.Book
+import com.expediagroup.graphql.federation.data.queries.federated.User
 import kotlin.test.assertEquals
 
 class EntityQueryResolverTest {

graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/execution/FederatedQueryResolverTest.kt

@@ -19,9 +19,9 @@ package com.expediagroup.graphql.federation.execution
 import graphql.ExecutionInput
 import graphql.GraphQL
 import org.junit.jupiter.api.Test
-import test.data.BookResolver
-import test.data.UserResolver
-import test.data.federatedTestSchema
+import com.expediagroup.graphql.federation.data.BookResolver
+import com.expediagroup.graphql.federation.data.UserResolver
+import com.expediagroup.graphql.federation.data.federatedTestSchema
 import kotlin.test.assertEquals
 import kotlin.test.assertFalse
 import kotlin.test.assertNotNull

graphql-kotlin-federation/src/test/kotlin/com/expediagroup/graphql/federation/execution/ServiceQueryResolverTest.kt

@@ -23,8 +23,8 @@ import com.expediagroup.graphql.federation.toFederatedSchema
 import graphql.ExecutionInput
 import graphql.GraphQL
 import org.junit.jupiter.api.Test
-import test.data.queries.simple.NestedQuery
-import test.data.queries.simple.SimpleQuery
+import com.expediagroup.graphql.federation.data.queries.simple.NestedQuery
+import com.expediagroup.graphql.federation.data.queries.simple.SimpleQuery
 import kotlin.test.assertEquals
 import kotlin.test.assertNotNull
 
@@ -72,7 +72,7 @@ class ServiceQueryResolverTest {
     @Test
     fun `verify can retrieve SDL using _service query`() {
         val config = FederatedSchemaGeneratorConfig(
-            supportedPackages = listOf("test.data.queries.federated"),
+            supportedPackages = listOf("com.expediagroup.graphql.federation.data.queries.federated"),
             hooks = FederatedSchemaGeneratorHooks(FederatedTypeRegistry())
         )
 
@@ -101,7 +101,7 @@ class ServiceQueryResolverTest {
     @Test
     fun `verify can retrieve SDL using _service query for non-federated schemas`() {
         val config = FederatedSchemaGeneratorConfig(
-            supportedPackages = listOf("test.data.queries.simple"),
+            supportedPackages = listOf("com.expediagroup.graphql.federation.data.queries.simple"),
             hooks = FederatedSchemaGeneratorHooks(FederatedTypeRegistry())
         )
 

graphql-kotlin-schema-generator/pom.xml

@@ -16,6 +16,7 @@
     <properties>
         <project.root>${project.basedir}/..</project.root>
         <rxjava2.version>2.2.12</rxjava2.version>
+        <guava.version>28.0-jre</guava.version>
     </properties>
 
     <dependencies>
@@ -32,8 +33,13 @@
             <artifactId>kotlin-reflect</artifactId>
         </dependency>
         <dependency>
-            <groupId>org.reflections</groupId>
-            <artifactId>reflections</artifactId>
+            <groupId>io.github.classgraph</groupId>
+            <artifactId>classgraph</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>com.google.guava</groupId>
+            <artifactId>guava</artifactId>
+            <version>${guava.version}</version>
         </dependency>
         <dependency>
             <groupId>com.fasterxml.jackson.module</groupId>

graphql-kotlin-schema-generator/src/main/kotlin/com/expediagroup/graphql/generator/SubTypeMapper.kt

@@ -16,12 +16,35 @@
 
 package com.expediagroup.graphql.generator
 
-import org.reflections.Reflections
+import io.github.classgraph.ClassGraph
+import io.github.classgraph.ClassInfo
+import io.github.classgraph.ClassInfoList
 import kotlin.reflect.KClass
+import kotlin.reflect.jvm.jvmName
 
 internal class SubTypeMapper(supportedPackages: List<String>) {
 
-    private val reflections = Reflections(supportedPackages)
+    @Suppress("Detekt.SpreadOperator")
+    private val scanResult = ClassGraph()
+        .enableAllInfo()
+        .whitelistPackages(*supportedPackages.toTypedArray())
+        .scan()
 
-    fun getSubTypesOf(kclass: KClass<*>): List<KClass<*>> = reflections.getSubTypesOf(kclass.java).filterNot { it.kotlin.isAbstract }.map { it.kotlin }
+    fun getSubTypesOf(kclass: KClass<*>): List<KClass<*>> {
+        val classInfo = scanResult.getClassInfo(kclass.jvmName) ?: return emptyList()
+
+        return getImplementingClasses(classInfo)
+            .union(classInfo.subclasses)
+            .map { it.loadClass().kotlin }
+            .filterNot { it.isAbstract }
+    }
+
+    @Suppress("Detekt.SwallowedException")
+    private fun getImplementingClasses(classInfo: ClassInfo) =
+        try {
+            classInfo.classesImplementing
+        } catch (e: IllegalArgumentException) {
+            // Ignored, just return empty list
+            ClassInfoList.emptyList()
+        }
 }

graphql-kotlin-schema-generator/src/test/kotlin/com/expediagroup/graphql/generator/SubTypeMapperTest.kt

@@ -22,6 +22,10 @@ import kotlin.test.assertEquals
 @Suppress("Detekt.UnusedPrivateClass")
 internal class SubTypeMapperTest {
 
+    private interface NoSubTypesInterface
+
+    private abstract class NoSubTypesClass
+
     private interface MyInterface {
         fun getValue(): Int
     }
@@ -75,4 +79,20 @@ internal class SubTypeMapperTest {
 
         assertEquals(expected = 0, actual = list.size)
     }
+
+    @Test
+    fun `interface with no subtypes`() {
+        val mapper = SubTypeMapper(listOf("com.expediagroup.graphql"))
+        val list = mapper.getSubTypesOf(NoSubTypesInterface::class)
+
+        assertEquals(expected = 0, actual = list.size)
+    }
+
+    @Test
+    fun `abstract class with no subtypes`() {
+        val mapper = SubTypeMapper(listOf("com.expediagroup.graphql"))
+        val list = mapper.getSubTypesOf(NoSubTypesClass::class)
+
+        assertEquals(expected = 0, actual = list.size)
+    }
 }

pom.xml

@@ -66,7 +66,7 @@
         <jackson-module-kotlin.version>2.10.0</jackson-module-kotlin.version>
         <kotlin.version>1.3.50</kotlin.version>
         <kotlin-coroutines.version>1.3.2</kotlin-coroutines.version>
-        <reflections.version>0.9.11</reflections.version>
+        <classgraph.version>4.8.52</classgraph.version>
         <spring-boot.version>2.2.0.RELEASE</spring-boot.version>
 
         <!-- Test Dependency Versions -->
@@ -273,9 +273,9 @@
                 <version>${kotlin.version}</version>
             </dependency>
             <dependency>
-                <groupId>org.reflections</groupId>
-                <artifactId>reflections</artifactId>
-                <version>${reflections.version}</version>
+                <groupId>io.github.classgraph</groupId>
+                <artifactId>classgraph</artifactId>
+                <version>${classgraph.version}</version>
             </dependency>
             <dependency>
                 <groupId>com.fasterxml.jackson.module</groupId>