Added a small GraphQL example to REST-API (AccountResource)

remote/rest-server/pom.xml

@@ -80,6 +80,11 @@
             <version>5.3.2</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>com.graphql-java</groupId>
+            <artifactId>graphql-java</artifactId>
+            <version>16.2</version>
+        </dependency>
     </dependencies>
 
     <build>

remote/rest-server/src/main/java/resources/AccountResourceGraphQL.java

+package resources;
+
+import graphql.ExecutionResult;
+import graphql.GraphQL;
+import graphql.schema.DataFetcher;
+import graphql.schema.GraphQLSchema;
+import graphql.schema.idl.RuntimeWiring;
+import graphql.schema.idl.SchemaGenerator;
+import graphql.schema.idl.SchemaParser;
+import graphql.schema.idl.TypeDefinitionRegistry;
+import graphql.schema.idl.TypeRuntimeWiring;
+import model.Account;
+
+import javax.ws.rs.GET;
+import javax.ws.rs.Path;
+import javax.ws.rs.core.Response;
+import java.io.IOException;
+import java.net.URISyntaxException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.Collection;
+import java.util.List;
+
+@Path("/accounts_graphql")
+public class AccountResourceGraphQL {
+
+    static GraphQL graphQL;
+
+    static GraphQL getGraphQL() {
+        if (graphQL != null) return graphQL;
+        try {
+            String sdl = Files.readString(Paths.get(ClassLoader.getSystemClassLoader().getResource("accountSchema.graphqls").toURI()));
+
+            TypeDefinitionRegistry typeRegistry = new SchemaParser().parse(sdl);
+
+            DataFetcher<Collection<Account>> accountsDataFetcher = (env) -> {
+                Integer id = env.getArgument("id");
+                return id == null ?
+                        AccountResource.accounts.values() :
+                        List.of(AccountResource.accounts.get(id));
+            };
+
+            RuntimeWiring runtimeWiring = RuntimeWiring.newRuntimeWiring()
+                    .type(TypeRuntimeWiring.newTypeWiring("Query").dataFetcher("accounts", accountsDataFetcher))
+                    .build();
+
+            GraphQLSchema schema = new SchemaGenerator().makeExecutableSchema(typeRegistry, runtimeWiring);
+            graphQL = GraphQL.newGraphQL(schema).build();
+
+        } catch (URISyntaxException | IOException e) {
+            e.printStackTrace();
+        }
+        return graphQL;
+    }
+
+    @GET
+    public Response getAccountsByGraphQLQuery(String query) {
+        ExecutionResult res = getGraphQL().execute(query);
+
+        if (res.getErrors().size() > 0) {
+            String msg = res.getErrors().get(0).getMessage();
+            return Response.status(400).entity(msg).build();
+        }
+
+        String result = res.getData().toString();
+        return Response.ok().entity(result).build();
+    }
+
+}

remote/rest-server/src/main/resources/accountSchema.graphqls

+schema {
+    query: Query
+}
+
+type Query {
+    accounts(id: Int) : [Account]
+}
+
+type Account {
+    id: Int!
+    owner: String
+    entries: [AccountEntry]
+}
+
+type AccountEntry {
+    subject: String
+    value: Int!
+    date: String
+}
\ No newline at end of file

remote/rest-server/src/test/Account service.postman_collection.json

 {
 	"info": {
-		"_postman_id": "4da4d35a-fef5-417f-96cc-fdd6b4393e2a",
+		"_postman_id": "873b504f-ffac-469a-9d38-c1a55744e4a0",
 		"name": "Account service",
 		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
 	},
@@ -11,7 +11,6 @@
 				{
 					"listen": "test",
 					"script": {
-						"id": "675c4b37-800c-4519-accd-5cb9dc0c2827",
 						"exec": [
 							"pm.test(\"Post account\", function () {",
 							"    pm.response.to.have.status(201);",
@@ -66,7 +65,6 @@
 				{
 					"listen": "test",
 					"script": {
-						"id": "4fcf2ea9-9496-4db9-8f61-ecd2853d6490",
 						"exec": [
 							"pm.test(\"Get accounts\", function () {",
 							"    pm.response.to.have.status(200);",
@@ -87,10 +85,6 @@
 						"type": "text"
 					}
 				],
-				"body": {
-					"mode": "raw",
-					"raw": ""
-				},
 				"url": {
 					"raw": "http://localhost:8080/accounts",
 					"protocol": "http",
@@ -111,7 +105,6 @@
 				{
 					"listen": "test",
 					"script": {
-						"id": "e9506f16-d8da-4e5d-8dc3-17b0d9560fe5",
 						"exec": [
 							"pm.test(\"Get account\", function () {",
 							"    pm.response.to.have.status(200);",
@@ -132,10 +125,6 @@
 						"type": "text"
 					}
 				],
-				"body": {
-					"mode": "raw",
-					"raw": ""
-				},
 				"url": {
 					"raw": "http://localhost:8080/accounts/:id",
 					"protocol": "http",
@@ -163,7 +152,6 @@
 				{
 					"listen": "prerequest",
 					"script": {
-						"id": "a0021e71-ee2e-460a-b872-eb74e1d4dc61",
 						"exec": [
 							""
 						],
@@ -173,7 +161,6 @@
 				{
 					"listen": "test",
 					"script": {
-						"id": "e61d2ed4-c329-456b-95c0-f30f5889a947",
 						"exec": [
 							"pm.test(\"Patch account\", function () {",
 							"    pm.response.to.have.status(200);",
@@ -232,7 +219,6 @@
 				{
 					"listen": "test",
 					"script": {
-						"id": "20b253b3-60bb-43d8-9e26-4bb385253034",
 						"exec": [
 							"pm.test(\"Put account\", function () {",
 							"    pm.response.to.have.status(200);",
@@ -291,7 +277,6 @@
 				{
 					"listen": "test",
 					"script": {
-						"id": "a3f15630-0886-4420-a9b7-cd6fe798ca3b",
 						"exec": [
 							"pm.test(\"Delete account\", function () {",
 							"    pm.response.to.have.status(204);",
@@ -330,6 +315,43 @@
 				}
 			},
 			"response": []
+		},
+		{
+			"name": "Get accounts GraphQL",
+			"event": [
+				{
+					"listen": "test",
+					"script": {
+						"exec": [
+							""
+						],
+						"type": "text/javascript"
+					}
+				}
+			],
+			"protocolProfileBehavior": {
+				"disableBodyPruning": true
+			},
+			"request": {
+				"method": "GET",
+				"header": [],
+				"body": {
+					"mode": "raw",
+					"raw": "{ \r\n    accounts {\r\n        id\r\n        owner\r\n    }\r\n}"
+				},
+				"url": {
+					"raw": "http://localhost:8080/accounts_graphql",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8080",
+					"path": [
+						"accounts_graphql"
+					]
+				}
+			},
+			"response": []
 		}
 	]
 }
\ No newline at end of file