Warning
Rather use https://github.com/phillip-kruger/quarkus-graphql-examples as this is not being maintained and kept us to date.
This is an example of the MicroProfile GraphQL API using the SmallRye Implementation. It's done as part of these blog posts:
and these presentations:
- Upcoming: Global Summit for Java devs'20
- Quarkus Insights
- #OffTheChain
- joziJUG
- SouJava
- DevConf.cz
- Java cloud conference
The services are exposed with both REST and GraphQL for comparison.
This example expose person data as well as scores that the person got for certain activities.
(generate from https://code.quarkus.io/)
cd quarkus-example
mvn clean install quarkus:dev
cd wildfly-example
mvn clean install wildfly:run
This will start the application on port 8080.
Go to http://localhost:8080 to test the application.
- Click on the 'REST' link to open Swagger UI to test the JAX-RS services.
- Click on the 'GraphQL' link to open GraphiQL UI to test the MicroProfile GraphQL service.
To stop the application, ctrl-c in the maven session.
See the model in the JavaDoc (target/apidocs/index.html)
Schema: http://localhost:8080/openapi
curl -X GET "http://localhost:8080/rest/profile/1" -H "accept: application/json"
Schema: http://localhost:8080/graphql/schema.graphql
{
person(id:1){
names
surname
}
}
{
person(id:1){
names
surname
scores{
name
value
}
}
}
in the log file:
======= Getting person [1] =======
======= Getting scores [512-46-5065] =======
without score
{
person(id:1){
names
surname
}
}
in the log file:
======= Getting person [1] =======
{
people{
names
scores{
name
}
}
}
in the log file:
======= Getting scores [797-95-4822, 373-95-3047, 097-87-6795, 347-01-8880, 733-86-4423, 560-99-2165, 091-07-5401, 539-70-2014, 029-18-5986, 287-58-0690] =======
{
person1:person(id:1){
surname
scores{
name
value
}
}
person2:person(id:2){
surname
}
}
or more than one query:
@Query
public Integer getRandomNumber(long seed){
Random random = new Random(seed);
return random.nextInt();
}
{
person1:person(id:1){
surname
scores{
name
value
}
}
randomId:randomNumber(seed:11)
}
{
people {
surname
}
}
{
person(id:1){
surname
birthDate
}
}
@Query
public List<Person> getPersonsWithSurname(
@DefaultValue("Doyle") String surname) {
return personService.getPeopleWithSurname(surname);
}
Providing a parameter
{
personsWithSurname(surname:"Hyatt") {
names
}
}
Uing the default
{
personsWithSurname {
names
}
}
{
person(id:1){
surname
scores{
thisDoesNotExist
}
}
}
{
person(id:1){
surname
scores{
name
value
}
}
}
This will be specific to your setup. For me:
Start Prometheus:
cd /opt/Metrics/prometheus-2.19.2.linux-amd64
./prometheus --config.file=prometheus.yml
(prometheus.yml is in the root folder)
Start Grafana:
sudo systemctl start grafana-server
(grafana.json is in the root folder)
Start Jaeger:
docker run -p 5775:5775/udp -p 6831:6831/udp -p 6832:6832/udp -p 5778:5778 -p 16686:16686 -p 14268:14268 jaegertracing/all-in-one:latest
@Timed(name = "personTimer", description = "How long does it take to get a Person.", unit = MetricUnits.NANOSECONDS)
@Counted(name = "personCount", description = "How many times did we ask for Person.")
@RolesAllowed("admin")
@Query
public Integer getRandomNumber(@Min(10) long seed){
Random random = new Random(seed);
return random.nextInt();
}
{
randomNumber(seed:9)
}
@Mutation
public Person updatePerson(Person person){
return personService.updateOrCreate(person);
}
@Mutation
public Person deletePerson(Long id){
return personService.delete(id);
}
mutation CreatePerson{
updatePerson(person :
{
names: "Phillip"
}
){
id
names
surname
profilePictures
website
}
}
(using the generated id)
mutation UpdatePerson{
updatePerson(person :
{
id: 11,
names:"Phillip",
surname: "Kruger",
profilePictures: [
"https://pbs.twimg.com/profile_images/1170690050524405762/I8KJ_hF4_400x400.jpg"
],
website: "http://www.phillip-kruger.com"
}){
id
names
surname
profilePictures
website
}
}
(using the id)
mutation DeletePerson{
deletePerson(id :11){
id
surname
}
}
quarkus.hibernate-orm.log.sql=true
@Inject
Context context;
JsonArray selectedFields = context.getSelectedFields();
System.out.println("selectedFields [" + selectedFields +"]");
{
people{
surname
}
}
See the model in the JavaDoc (target/apidocs/index.html)
//@Inject
PersonGraphQLClient graphQLClient = GraphQlClientBuilder.newBuilder().build(PersonGraphQLClient.class);
Person graphQLPerson = graphQLClient.getPerson(id);
System.err.println("================ GRAPHQL ================");
System.err.println(graphQLPerson);
{
__schema{
types {
name
kind
}
}
}
query IntrospectionQuery {
__schema {
queryType { name }
mutationType { name }
subscriptionType { name }
types {
...FullType
}
directives {
name
description
locations
args {
...InputValue
}
}
}
}
fragment FullType on __Type {
kind
name
description
fields(includeDeprecated: true) {
name
description
args {
...InputValue
}
type {
...TypeRef
}
isDeprecated
deprecationReason
}
inputFields {
...InputValue
}
interfaces {
...TypeRef
}
enumValues(includeDeprecated: true) {
name
description
isDeprecated
deprecationReason
}
possibleTypes {
...TypeRef
}
}
fragment InputValue on __InputValue {
name
description
type { ...TypeRef }
defaultValue
}
fragment TypeRef on __Type {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
}
}
}
}
}
}
}
}