update graphql-kotlin example to fed 2.3 schema (#370)

implementations/graphql-kotlin/build.gradle.kts

@@ -17,7 +17,7 @@ repositories {
 dependencies {
 	implementation("org.jetbrains.kotlin:kotlin-reflect")
 	implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
-	implementation("com.expediagroup:graphql-kotlin-spring-server:7.0.0-alpha.0")
+	implementation("com.expediagroup:graphql-kotlin-spring-server:6.3.6")
 }
 
 tasks.withType<KotlinCompile> {

implementations/graphql-kotlin/src/main/kotlin/com/example/demo/CustomSchema.kt

@@ -0,0 +1,16 @@
+package com.example.demo
+
+import com.expediagroup.graphql.generator.annotations.GraphQLDirective
+import com.expediagroup.graphql.generator.federation.directives.ComposeDirective
+import com.expediagroup.graphql.generator.federation.directives.LinkDirective
+import com.expediagroup.graphql.server.Schema
+import graphql.introspection.Introspection
+import org.springframework.stereotype.Component
+
+@LinkDirective(url = "https://myspecs.dev/myCustomDirective/v1.0", import = ["@custom"])
+@ComposeDirective("@custom")
+@Component
+class CustomSchema : Schema
+
+@GraphQLDirective(name = "custom", locations = [Introspection.DirectiveLocation.OBJECT])
+annotation class CustomDirective

implementations/graphql-kotlin/src/main/kotlin/com/example/demo/model/DeprecatedProduct.kt

@@ -4,7 +4,6 @@ import com.expediagroup.graphql.generator.annotations.GraphQLName
 import com.expediagroup.graphql.generator.federation.directives.FieldSet
 import com.expediagroup.graphql.generator.federation.directives.KeyDirective
 import com.expediagroup.graphql.generator.federation.execution.FederatedTypeResolver
-import com.expediagroup.graphql.generator.federation.execution.FederatedTypeSuspendResolver
 import graphql.schema.DataFetchingEnvironment
 import org.springframework.stereotype.Component
 
@@ -46,11 +45,13 @@ data class DeprecatedProduct(
 }
 
 @Component
-class DeprecatedProductResolver : FederatedTypeSuspendResolver<DeprecatedProduct> {
+class DeprecatedProductResolver : FederatedTypeResolver<DeprecatedProduct> {
     override val typeName: String = "DeprecatedProduct"
 
     override suspend fun resolve(
         environment: DataFetchingEnvironment,
-        representation: Map<String, Any>
-    ): DeprecatedProduct? = DeprecatedProduct.byReference(representation)
+        representations: List<Map<String, Any>>
+    ): List<DeprecatedProduct?> {
+        return representations.map { DeprecatedProduct.byReference(it) }
+    }
 }

implementations/graphql-kotlin/src/main/kotlin/com/example/demo/model/Inventory.kt

@@ -0,0 +1,43 @@
+package com.example.demo.model
+
+import com.expediagroup.graphql.generator.federation.directives.ExtendsDirective
+import com.expediagroup.graphql.generator.federation.directives.ExternalDirective
+import com.expediagroup.graphql.generator.federation.directives.FieldSet
+import com.expediagroup.graphql.generator.federation.directives.InterfaceObjectDirective
+import com.expediagroup.graphql.generator.federation.directives.KeyDirective
+import com.expediagroup.graphql.generator.federation.execution.FederatedTypeResolver
+import com.expediagroup.graphql.generator.scalars.ID
+import graphql.schema.DataFetchingEnvironment
+import org.springframework.stereotype.Component
+
+/*
+NOTE: @extends and @external are only required in graphql-kotlin v6, this was fixed in v7
+type Inventory @extends @interfaceObject @key(fields: "id") {
+  id: ID! @external
+  deprecatedProducts: [DeprecatedProduct!]!
+}
+ */
+@ExtendsDirective
+@KeyDirective(fields = FieldSet("id"))
+@InterfaceObjectDirective
+data class Inventory(@ExternalDirective val id: ID) {
+    fun deprecatedProducts(): List<DeprecatedProduct> = listOf(DEPRECATED_PRODUCT)
+}
+
+@Component
+class InventoryResolver : FederatedTypeResolver<Inventory> {
+    override val typeName: String = "Inventory"
+
+    override suspend fun resolve(
+        environment: DataFetchingEnvironment,
+        representations: List<Map<String, Any>>
+    ): List<Inventory?> {
+        return representations.map {
+            if (it["id"] == "apollo-oss") {
+                Inventory(ID("apollo-oss"))
+            } else {
+                null
+            }
+        }
+    }
+}

implementations/graphql-kotlin/src/main/kotlin/com/example/demo/model/Product.kt

@@ -1,12 +1,12 @@
 package com.example.demo.model
 
+import com.example.demo.CustomDirective
 import com.expediagroup.graphql.generator.annotations.GraphQLName
 import com.expediagroup.graphql.generator.federation.directives.FieldSet
 import com.expediagroup.graphql.generator.federation.directives.KeyDirective
 import com.expediagroup.graphql.generator.federation.directives.ProvidesDirective
 import com.expediagroup.graphql.generator.federation.directives.TagDirective
 import com.expediagroup.graphql.generator.federation.execution.FederatedTypeResolver
-import com.expediagroup.graphql.generator.federation.execution.FederatedTypeSuspendResolver
 import com.expediagroup.graphql.generator.scalars.ID
 import graphql.schema.DataFetchingEnvironment
 import org.springframework.stereotype.Component
@@ -47,6 +47,7 @@ type Product
   research: [ProductResearch!]!
 }
  */
+@CustomDirective
 @KeyDirective(fields = FieldSet("id"))
 @KeyDirective(fields = FieldSet("sku package"))
 @KeyDirective(fields = FieldSet("sku variation { id }"))
@@ -91,11 +92,13 @@ data class Product(
 }
 
 @Component
-class ProductsResolver : FederatedTypeSuspendResolver<Product> {
+class ProductsResolver : FederatedTypeResolver<Product> {
     override val typeName: String = "Product"
 
     override suspend fun resolve(
         environment: DataFetchingEnvironment,
-        representation: Map<String, Any>
-    ): Product? = Product.byReference(representation)
+        representations: List<Map<String, Any>>
+    ): List<Product?> {
+        return representations.map { Product.byReference(it) }
+    }
 }

implementations/graphql-kotlin/src/main/kotlin/com/example/demo/model/ProductResearch.kt

@@ -3,7 +3,6 @@ package com.example.demo.model
 import com.expediagroup.graphql.generator.federation.directives.FieldSet
 import com.expediagroup.graphql.generator.federation.directives.KeyDirective
 import com.expediagroup.graphql.generator.federation.execution.FederatedTypeResolver
-import com.expediagroup.graphql.generator.federation.execution.FederatedTypeSuspendResolver
 import com.expediagroup.graphql.generator.scalars.ID
 import graphql.schema.DataFetchingEnvironment
 import org.springframework.stereotype.Component
@@ -25,19 +24,21 @@ data class ProductResearch(
 )
 
 @Component
-class ProductResearchResolver : FederatedTypeSuspendResolver<ProductResearch> {
+class ProductResearchResolver : FederatedTypeResolver<ProductResearch> {
     override val typeName: String = "ProductResearch"
 
     override suspend fun resolve(
         environment: DataFetchingEnvironment,
-        representation: Map<String, Any>
-    ): ProductResearch? {
-        val study = representation["study"]
-        val caseNumber = if (study is Map<*, *>) {
-            study["caseNumber"].toString()
-        } else {
-            null
+        representations: List<Map<String, Any>>
+    ): List<ProductResearch?> {
+        return representations.map {
+            val study = it["study"]
+            val caseNumber = if (study is Map<*, *>) {
+                study["caseNumber"].toString()
+            } else {
+                null
+            }
+            RESEARCH_LIST.find { research -> research.study.caseNumber.value == caseNumber }
         }
-        return RESEARCH_LIST.find { research -> research.study.caseNumber.value == caseNumber }
     }
-}
+}

implementations/graphql-kotlin/src/main/kotlin/com/example/demo/model/User.kt

@@ -2,7 +2,6 @@ package com.example.demo.model
 
 import com.expediagroup.graphql.generator.federation.directives.*
 import com.expediagroup.graphql.generator.federation.execution.FederatedTypeResolver
-import com.expediagroup.graphql.generator.federation.execution.FederatedTypeSuspendResolver
 import com.expediagroup.graphql.generator.scalars.ID
 import graphql.schema.DataFetchingEnvironment
 import org.springframework.stereotype.Component
@@ -40,21 +39,23 @@ data class User(
 }
 
 @Component
-class UserResolver : FederatedTypeSuspendResolver<User> {
+class UserResolver : FederatedTypeResolver<User> {
     override val typeName: String = "User"
 
     override suspend fun resolve(
         environment: DataFetchingEnvironment,
-        representation: Map<String, Any>
-    ): User? {
-        val email = representation["email"]?.toString() ?: throw RuntimeException("invalid entity reference")
-        val user = User(email = ID(email), name = "Jane Smith", totalProductsCreated = 1337)
-        representation["totalProductsCreated"]?.toString()?.toIntOrNull()?.let { totalProductsCreated ->
-            user.totalProductsCreated = totalProductsCreated
+        representations: List<Map<String, Any>>
+    ): List<User?> {
+        return representations.map {
+            val email = it["email"]?.toString() ?: throw RuntimeException("invalid entity reference")
+            val user = User(email = ID(email), name = "Jane Smith", totalProductsCreated = 1337)
+            it["totalProductsCreated"]?.toString()?.toIntOrNull()?.let { totalProductsCreated ->
+                user.totalProductsCreated = totalProductsCreated
+            }
+            it["yearsOfEmployment"]?.toString()?.toIntOrNull()?.let { yearsOfEmployment ->
+                user.yearsOfEmployment = yearsOfEmployment
+            }
+            user
         }
-        representation["yearsOfEmployment"]?.toString()?.toIntOrNull()?.let { yearsOfEmployment ->
-            user.yearsOfEmployment = yearsOfEmployment
-        }
-        return user
     }
 }