Task: Upgraded the dgs graphql to submodules and parent modules for extends projects

dgs-graphql/.gitignore

@@ -0,0 +1,37 @@
+../HELP.md
+.gradle
+build/
+!gradle/wrapper/gradle-wrapper.jar
+!**/src/main/**/build/
+!**/src/test/**/build/
+
+### STS ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### IntelliJ IDEA ###
+.idea
+*.iws
+*.iml
+*.ipr
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/

dgs-graphql/build.gradle.kts

@@ -0,0 +1,44 @@
+import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
+
+plugins {
+	id("org.springframework.boot")
+	id("io.spring.dependency-management")
+	kotlin("jvm")
+	kotlin("plugin.spring")
+	kotlin("plugin.jpa")
+	id("com.netflix.dgs.codegen")
+}
+
+extra["dgsVersion"] = "4.5.0"
+
+dependencies {
+	implementation("com.netflix.graphql.dgs:graphql-dgs-spring-boot-starter:${property("dgsVersion")}")
+	runtimeOnly("com.netflix.graphql.dgs:graphql-dgs-subscriptions-websockets-autoconfigure:${property("dgsVersion")}")
+
+	implementation("org.springframework.boot:spring-boot-starter-security")
+	implementation("org.springframework.boot:spring-boot-starter-actuator")
+	implementation("org.springframework.boot:spring-boot-starter-data-jpa")
+	implementation("org.springframework.boot:spring-boot-starter-web")
+	implementation("org.springframework.boot:spring-boot-starter-webflux")
+	implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
+	implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
+	implementation("org.jetbrains.kotlin:kotlin-reflect")
+	implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
+	implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
+
+	developmentOnly("org.springframework.boot:spring-boot-devtools")
+	runtimeOnly("org.postgresql:postgresql")
+
+	testImplementation("org.springframework.boot:spring-boot-starter-test")
+	testImplementation("io.projectreactor:reactor-test")
+}
+
+tasks.withType<Test> {
+	useJUnitPlatform()
+}
+
+tasks.withType<com.netflix.graphql.dgs.codegen.gradle.GenerateJavaTask> {
+	packageName = "com.cubetiqs.graphql.demo.dgmodel"
+	schemaPaths = mutableListOf("${projectDir}/src/main/resources/schema")
+	generateClient = true
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/GraphqlDemoApplication.kt

@@ -0,0 +1,11 @@
+package com.cubetiqs.graphql.demo
+
+import org.springframework.boot.autoconfigure.SpringBootApplication
+import org.springframework.boot.runApplication
+
+@SpringBootApplication
+class GraphqlDemoApplication
+
+fun main(args: Array<String>) {
+    runApplication<GraphqlDemoApplication>(*args)
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/config/GraphQLConfig.kt

@@ -0,0 +1,6 @@
+package com.cubetiqs.graphql.demo.config
+
+import org.springframework.context.annotation.Configuration
+
+@Configuration
+class GraphQLConfig

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/config/ManagementConfig.kt

@@ -0,0 +1,8 @@
+package com.cubetiqs.graphql.demo.config
+
+import org.springframework.context.annotation.Configuration
+import org.springframework.transaction.annotation.EnableTransactionManagement
+
+@Configuration
+@EnableTransactionManagement
+class ManagementConfig

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/config/WebConfig.kt

@@ -0,0 +1,18 @@
+package com.cubetiqs.graphql.demo.config
+
+import org.springframework.context.annotation.Configuration
+import org.springframework.web.servlet.config.annotation.CorsRegistry
+import org.springframework.web.servlet.config.annotation.EnableWebMvc
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer
+
+@Configuration
+@EnableWebMvc
+class WebConfig : WebMvcConfigurer {
+    override fun addCorsMappings(corsRegistry: CorsRegistry) {
+        println("Hello World")
+        corsRegistry.addMapping("/**")
+            .allowedOrigins("*")
+            .allowedMethods("*")
+            .maxAge(3600)
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/config/WebSecurityConfig.kt

@@ -0,0 +1,23 @@
+package com.cubetiqs.graphql.demo.config
+
+import org.springframework.context.annotation.Configuration
+import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity
+import org.springframework.security.config.annotation.web.builders.HttpSecurity
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity
+import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter
+import org.springframework.security.config.http.SessionCreationPolicy
+
+@Configuration
+@EnableWebSecurity
+@EnableGlobalMethodSecurity(prePostEnabled = true, securedEnabled = true)
+class WebSecurityConfig : WebSecurityConfigurerAdapter() {
+    override fun configure(http: HttpSecurity) {
+        http.csrf().disable()
+            .sessionManagement()
+            .sessionCreationPolicy(SessionCreationPolicy.STATELESS)
+            .and()
+            .authorizeRequests()
+            .anyRequest()
+            .permitAll()
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/context/GMutation.kt

@@ -0,0 +1,8 @@
+package com.cubetiqs.graphql.demo.context
+
+import com.netflix.graphql.dgs.DgsComponent
+
+@Retention(AnnotationRetention.RUNTIME)
+@Target(AnnotationTarget.CLASS)
+@DgsComponent
+annotation class GMutation

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/context/GQuery.kt

@@ -0,0 +1,8 @@
+package com.cubetiqs.graphql.demo.context
+
+import com.netflix.graphql.dgs.DgsComponent
+
+@Retention(AnnotationRetention.RUNTIME)
+@Target(AnnotationTarget.CLASS)
+@DgsComponent
+annotation class GQuery

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/context/GSubscription.kt

@@ -0,0 +1,8 @@
+package com.cubetiqs.graphql.demo.context
+
+import com.netflix.graphql.dgs.DgsComponent
+
+@Retention(AnnotationRetention.RUNTIME)
+@Target(AnnotationTarget.CLASS)
+@DgsComponent
+annotation class GSubscription

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/AbstractEntity.kt

@@ -0,0 +1,10 @@
+package com.cubetiqs.graphql.demo.domain
+
+import org.springframework.data.jpa.domain.support.AuditingEntityListener
+import java.io.Serializable
+import javax.persistence.EntityListeners
+import javax.persistence.MappedSuperclass
+
+@MappedSuperclass
+@EntityListeners(AuditingEntityListener::class)
+abstract class AbstractEntity<T, ID : Serializable> : Serializable

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/AbstractInput.kt

@@ -0,0 +1,5 @@
+package com.cubetiqs.graphql.demo.domain
+
+import java.io.Serializable
+
+abstract class AbstractInput<T> : Serializable

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/account/Account.kt

@@ -0,0 +1,70 @@
+package com.cubetiqs.graphql.demo.domain.account
+
+import com.cubetiqs.graphql.demo.domain.AbstractEntity
+import com.cubetiqs.graphql.demo.domain.user.User
+import com.fasterxml.jackson.annotation.JsonBackReference
+import org.hibernate.Hibernate
+import org.springframework.data.annotation.CreatedDate
+import org.springframework.data.annotation.LastModifiedDate
+import java.math.BigDecimal
+import java.util.*
+import javax.persistence.*
+
+@Entity
+@Table(name = "accounts", indexes = [
+    Index(name = "idx_account_code", columnList = "code")
+])
+@EntityListeners(value = [AccountEntityListener::class])
+open class Account(
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    open var id: Long? = null,
+
+    @Column(length = 9)
+    open var code: String? = null,
+
+    @Column
+    open var balance: BigDecimal = BigDecimal.ZERO,
+
+    @Column
+    open var currentBalance: BigDecimal = BigDecimal.ZERO,
+
+    @Column(length = 10)
+    @Enumerated(EnumType.STRING)
+    open var type: AccountType = AccountType.BASIC,
+
+    @Column(length = 3)
+    @Enumerated(EnumType.STRING)
+    open var currency: AccountCurrency = AccountCurrency.USD,
+
+    @Version
+    open var version: Long? = null,
+
+    @CreatedDate
+    @Temporal(TemporalType.TIMESTAMP)
+    open var createdDate: Date? = null,
+
+    @LastModifiedDate
+    @Temporal(TemporalType.TIMESTAMP)
+    open var updatedDate: Date? = null,
+
+    @JsonBackReference
+    @ManyToOne(fetch = FetchType.LAZY,cascade = [CascadeType.REFRESH, CascadeType.DETACH])
+    @JoinColumn(name = "user_id")
+    open var user: User? = null,
+) : AbstractEntity<Account, Long>() {
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || Hibernate.getClass(this) != Hibernate.getClass(other)) return false
+        other as Account
+
+        return id != null && id == other.id
+    }
+
+    override fun hashCode(): Int = 2083479647
+
+    @Override
+    override fun toString(): String {
+        return this::class.simpleName + "(id = $id , balance = $balance , currentBalance = $currentBalance , type = $type , currency = $currency , version = $version , createdDate = $createdDate , updatedDate = $updatedDate , user = ${user?.id} )"
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/account/AccountCurrency.kt

@@ -0,0 +1,6 @@
+package com.cubetiqs.graphql.demo.domain.account
+
+enum class AccountCurrency {
+    USD,
+    KHR,
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/account/AccountEntityListener.kt

@@ -0,0 +1,25 @@
+package com.cubetiqs.graphql.demo.domain.account
+
+import java.util.*
+import javax.persistence.PostPersist
+import javax.persistence.PrePersist
+import javax.persistence.PreUpdate
+
+class AccountEntityListener {
+    @PrePersist
+    fun beforeSave(account: Account) {
+        if (account.createdDate == null) {
+            account.createdDate = Date()
+        }
+    }
+
+    @PreUpdate
+    fun beforeUpdate(account: Account) {
+        account.updatedDate = Date()
+    }
+
+    @PostPersist
+    fun afterSaved(account: Account) {
+        account.code = account.id.toString().padStart(9, '0')
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/account/AccountInput.kt

@@ -0,0 +1,7 @@
+package com.cubetiqs.graphql.demo.domain.account
+
+data class AccountInput(
+    var userId: Long? = null,
+    var type: AccountType? = null,
+    var currency: AccountCurrency? = null,
+)

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/account/AccountMapper.kt

@@ -0,0 +1,10 @@
+package com.cubetiqs.graphql.demo.domain.account
+
+object AccountMapper {
+    fun fromInputToAccount(input: AccountInput): Account {
+        return Account(
+            type = input.type ?: AccountType.BASIC,
+            currency = input.currency ?: AccountCurrency.USD,
+        )
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/account/AccountType.kt

@@ -0,0 +1,7 @@
+package com.cubetiqs.graphql.demo.domain.account
+
+enum class AccountType {
+    BASIC,
+    PREMIUM,
+    BUSINESS,
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/user/User.kt

@@ -0,0 +1,75 @@
+package com.cubetiqs.graphql.demo.domain.user
+
+import com.cubetiqs.graphql.demo.domain.AbstractEntity
+import com.cubetiqs.graphql.demo.domain.account.Account
+import com.fasterxml.jackson.annotation.JsonManagedReference
+import org.hibernate.Hibernate
+import org.springframework.data.annotation.CreatedDate
+import org.springframework.data.annotation.LastModifiedDate
+import java.util.*
+import javax.persistence.*
+
+@Entity
+@Table(
+    name = "users", indexes = [
+        Index(name = "idx_user_code", columnList = "code"),
+        Index(name = "idx_user_username", columnList = "username"),
+    ]
+)
+@EntityListeners(value = [UserEntityListener::class])
+open class User(
+    @Id
+    @GeneratedValue(strategy = GenerationType.IDENTITY)
+    open var id: Long? = null,
+
+    @Column(unique = true, length = 65, nullable = false)
+    open var code: String? = null,
+
+    @Column(unique = true, length = 35, nullable = false)
+    open var username: String? = null,
+
+    @Column(length = 100)
+    open var password: String? = null,
+
+    @Column(length = 50)
+    open var name: String? = null,
+
+    @Version
+    open var version: Long? = null,
+
+    @CreatedDate
+    @Temporal(TemporalType.TIMESTAMP)
+    open var createdDate: Date? = null,
+
+    @LastModifiedDate
+    @Temporal(TemporalType.TIMESTAMP)
+    open var updatedDate: Date? = null,
+
+    @JsonManagedReference
+    @OneToMany(fetch = FetchType.LAZY,mappedBy = "user", cascade = [CascadeType.ALL], orphanRemoval = true)
+    open var accounts: MutableSet<Account> = mutableSetOf(),
+
+    @Basic
+    open var enabled: Boolean = true,
+) : AbstractEntity<User, Long>() {
+    @Transient
+    fun updatePassword(newPassword: String) {
+        // hash it here
+        this.password = newPassword
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || Hibernate.getClass(this) != Hibernate.getClass(other)) return false
+        other as User
+
+        return id != null && id == other.id
+    }
+
+    override fun hashCode(): Int = 562048007
+
+    @Override
+    override fun toString(): String {
+        return this::class.simpleName + "(id = $id , code = $code , username = $username , password = $password , name = $name , version = $version , createdDate = $createdDate , updatedDate = $updatedDate , enabled = $enabled )"
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/user/UserEntityListener.kt

@@ -0,0 +1,22 @@
+package com.cubetiqs.graphql.demo.domain.user
+
+import java.util.*
+import javax.persistence.PrePersist
+import javax.persistence.PreUpdate
+
+class UserEntityListener {
+    @PrePersist
+    fun beforeSave(user: User) {
+        user.id = null
+        user.code = UUID.randomUUID().toString()
+
+        if (user.createdDate == null) {
+            user.createdDate = Date()
+        }
+    }
+
+    @PreUpdate
+    fun beforeUpdate(user: User) {
+        user.updatedDate = Date()
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/user/UserInput.kt

@@ -0,0 +1,10 @@
+package com.cubetiqs.graphql.demo.domain.user
+
+import com.cubetiqs.graphql.demo.domain.AbstractInput
+
+data class UserInput(
+    val username: String? = null,
+    val password: String? = null,
+    val name: String? = null,
+    val enabled: Boolean? = null,
+) : AbstractInput<UserInput>()

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/domain/user/UserMapper.kt

@@ -0,0 +1,12 @@
+package com.cubetiqs.graphql.demo.domain.user
+
+object UserMapper {
+    fun fromInputToUser(input: UserInput): User {
+        return User(
+            username = input.username,
+            password = input.password,
+            name = input.name,
+            enabled = input.enabled ?: true,
+        )
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/repository/AccountRepository.kt

@@ -0,0 +1,8 @@
+package com.cubetiqs.graphql.demo.repository
+
+import com.cubetiqs.graphql.demo.domain.account.Account
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+
+@Repository
+interface AccountRepository : JpaRepository<Account, Long>

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/repository/UserRepository.kt

@@ -0,0 +1,17 @@
+package com.cubetiqs.graphql.demo.repository
+
+import com.cubetiqs.graphql.demo.domain.user.User
+import org.springframework.data.domain.Page
+import org.springframework.data.domain.Pageable
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.data.jpa.repository.Query
+import org.springframework.stereotype.Repository
+
+@Repository
+interface UserRepository : JpaRepository<User, Long> {
+    @Query("select u from User u where u.enabled = true")
+    fun queryAllByEnabledIsTrue(pageable: Pageable): Page<User>
+
+    @Query("select (count(u) > 0) from User u where u.username = ?1")
+    fun existsAllByUsername(username: String): Boolean
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/resolver/mutation/AccountMutationResolver.kt

@@ -0,0 +1,32 @@
+package com.cubetiqs.graphql.demo.resolver.mutation
+
+import com.cubetiqs.graphql.demo.context.GMutation
+import com.cubetiqs.graphql.demo.dgmodel.DgsConstants
+import com.cubetiqs.graphql.demo.domain.account.Account
+import com.cubetiqs.graphql.demo.domain.account.AccountInput
+import com.cubetiqs.graphql.demo.domain.account.AccountMapper
+import com.cubetiqs.graphql.demo.repository.AccountRepository
+import com.cubetiqs.graphql.demo.repository.UserRepository
+import com.netflix.graphql.dgs.DgsMutation
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.transaction.annotation.Propagation
+import org.springframework.transaction.annotation.Transactional
+
+@GMutation
+class AccountMutationResolver {
+    @Autowired
+    private lateinit var accountRepository: AccountRepository
+
+    @Autowired
+    private lateinit var userRepository: UserRepository
+
+    @DgsMutation(field = DgsConstants.MUTATION.OpenAccount)
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    fun openAccount(input: AccountInput): Account {
+        val account = AccountMapper.fromInputToAccount(input)
+        val user = userRepository.findById(input.userId ?: 0).orElse(null)
+            ?: throw Exception("User not found to open an account!")
+        account.user = user
+        return accountRepository.save(account)
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/resolver/mutation/UserMutationResolver.kt

@@ -0,0 +1,26 @@
+package com.cubetiqs.graphql.demo.resolver.mutation
+
+import com.cubetiqs.graphql.demo.context.GMutation
+import com.cubetiqs.graphql.demo.dgmodel.DgsConstants
+import com.cubetiqs.graphql.demo.domain.user.User
+import com.cubetiqs.graphql.demo.domain.user.UserInput
+import com.cubetiqs.graphql.demo.domain.user.UserMapper
+import com.cubetiqs.graphql.demo.repository.UserRepository
+import com.netflix.graphql.dgs.DgsMutation
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.transaction.annotation.Propagation
+import org.springframework.transaction.annotation.Transactional
+
+@GMutation
+class UserMutationResolver @Autowired constructor(
+    private val userRepository: UserRepository,
+) {
+    @DgsMutation(field = DgsConstants.MUTATION.CreateUser)
+    @Transactional(propagation = Propagation.REQUIRES_NEW)
+    fun createUser(input: UserInput): User {
+        if (userRepository.existsAllByUsername(input.username ?: "")) throw Exception("Username has been already existed!")
+
+        val user = UserMapper.fromInputToUser(input)
+        return userRepository.save(user)
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/resolver/query/AccountQueryResolver.kt

@@ -0,0 +1,20 @@
+package com.cubetiqs.graphql.demo.resolver.query
+
+import com.cubetiqs.graphql.demo.context.GQuery
+import com.cubetiqs.graphql.demo.dgmodel.DgsConstants
+import com.cubetiqs.graphql.demo.domain.account.Account
+import com.cubetiqs.graphql.demo.repository.AccountRepository
+import com.netflix.graphql.dgs.DgsQuery
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.data.domain.Pageable
+
+@GQuery
+class AccountQueryResolver @Autowired constructor(
+    private val accountRepository: AccountRepository,
+) {
+    @DgsQuery(field = DgsConstants.QUERY.FetchAccounts)
+    fun fetchAccounts(): Collection<Account> {
+        val accounts = accountRepository.findAll(Pageable.unpaged())
+        return accounts.content
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/resolver/query/HelloQueryResolver.kt

@@ -0,0 +1,22 @@
+package com.cubetiqs.graphql.demo.resolver.query
+
+import com.cubetiqs.graphql.demo.context.GQuery
+import com.cubetiqs.graphql.demo.dgmodel.DgsConstants
+import com.netflix.graphql.dgs.DgsQuery
+import org.springframework.security.access.prepost.PreAuthorize
+import reactor.core.publisher.Mono
+import java.util.concurrent.CompletableFuture
+
+@GQuery
+class HelloQueryResolver {
+    @DgsQuery(field = "hello")
+    fun hello(): CompletableFuture<String> {
+        return Mono.just("Hello Query...!").toFuture()
+    }
+
+    @PreAuthorize("hasAnyRole('ADMIN')")
+    @DgsQuery(field = DgsConstants.QUERY.HelloByName)
+    fun helloByName(name: String): CompletableFuture<String> {
+        return Mono.just("Hello $name...!").toFuture()
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/resolver/query/UserQueryResolver.kt

@@ -0,0 +1,20 @@
+package com.cubetiqs.graphql.demo.resolver.query
+
+import com.cubetiqs.graphql.demo.context.GQuery
+import com.cubetiqs.graphql.demo.dgmodel.DgsConstants
+import com.cubetiqs.graphql.demo.domain.user.User
+import com.cubetiqs.graphql.demo.repository.UserRepository
+import com.netflix.graphql.dgs.DgsQuery
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.data.domain.Pageable
+
+@GQuery
+class UserQueryResolver @Autowired constructor(
+    private val userRepository: UserRepository,
+) {
+    @DgsQuery(field = DgsConstants.QUERY.FetchUsers)
+    fun fetchUsers(): Collection<User> {
+        val users = userRepository.queryAllByEnabledIsTrue(Pageable.unpaged())
+        return users.content
+    }
+}

dgs-graphql/src/main/kotlin/com/cubetiqs/graphql/demo/resolver/subscription/HelloSubscriptionResolver.kt

@@ -0,0 +1,16 @@
+package com.cubetiqs.graphql.demo.resolver.subscription
+
+import com.cubetiqs.graphql.demo.context.GSubscription
+import com.netflix.graphql.dgs.DgsSubscription
+import graphql.schema.DataFetchingEnvironment
+import org.reactivestreams.Publisher
+import reactor.core.publisher.Flux
+import java.time.Duration
+
+@GSubscription
+class HelloSubscriptionResolver {
+    @DgsSubscription(field = "hello")
+    fun hello(env: DataFetchingEnvironment): Publisher<Int> {
+        return Flux.range(1, 10).delayElements(Duration.ofSeconds(1))
+    }
+}

dgs-graphql/src/main/resources/application.yml

@@ -0,0 +1,33 @@
+server:
+  port: 8081
+
+# Spring Boot
+spring:
+  datasource:
+    url: jdbc:postgresql://${DB_HOST:localhost}:5432/${DB_NAME:graphql-demo}
+    username: ${DB_USER:your-username}
+    password: ${DB_PASSWORD:your-password}
+    driver-class-name: org.postgresql.Driver
+  jpa:
+    database: postgresql
+    database-platform: org.hibernate.dialect.PostgreSQLDialect
+    hibernate:
+      ddl-auto: ${HIBERNATE_DDL:update}
+    show-sql: ${JPA_SHOW_SQL:true}
+    properties:
+      hibernate:
+        enable_lazy_load_no_trans: ${HIBERNATE_LAZY_NO_TRANS:true}
+  main:
+    allow-bean-definition-overriding: true
+# Spring Boot Actuator
+management:
+  endpoints:
+    web:
+      exposure:
+        include: health,info,metrics
+
+# DGS GraphQL
+dgs:
+  graphql:
+    graphiql:
+      enabled: true

dgs-graphql/src/main/resources/schema/account.graphql

@@ -0,0 +1,26 @@
+enum AccountType {
+    BASIC
+    PREMIUM
+    BUSINESS
+}
+
+enum AccountCurrency {
+    USD
+    KHR
+}
+
+type Account {
+    id: ID
+    code: String
+    balance: Float
+    currentBalance: Float
+    type: AccountType
+    currency: AccountCurrency
+    user: User!
+}
+
+input AccountInput {
+    userId: Int
+    type: AccountType
+    currency: AccountCurrency
+}

dgs-graphql/src/main/resources/schema/expense.graphql

@@ -0,0 +1,16 @@
+input ExpenseFilter {
+    isIncome: Boolean
+}
+
+type Expense {
+    id: ID
+    description: String
+    amount: Int
+    isIncome: Boolean
+}
+
+type ExpensePage {
+    list: [Expense]
+    totalPages: Int
+    currentPage: Int
+}

dgs-graphql/src/main/resources/schema/schema.graphqls

@@ -0,0 +1,21 @@
+type Query {
+    hello: String
+
+    helloByName(name: String!): String
+
+    fetchUsers: [User]!
+
+    fetchAccounts: [Account]!
+
+    fetchExpenses(filter: ExpenseFilter, pageNumber: Int, pageSize: Int) : ExpensePage
+}
+
+type Subscription {
+    hello: Int
+}
+
+type Mutation {
+    createUser(input: UserInput): User!
+
+    openAccount(input: AccountInput): Account!
+}

dgs-graphql/src/main/resources/schema/user.graphql

@@ -0,0 +1,14 @@
+type User {
+    id: ID
+    code: String
+    username: String
+    name: String
+    enabled: Boolean
+}
+
+input UserInput {
+    username: String
+    password: String
+    name: String
+    enabled: Boolean
+}

dgs-graphql/src/test/kotlin/com/cubetiqs/graphql/demo/GraphqlDemoApplicationTests.kt

@@ -0,0 +1,55 @@
+package com.cubetiqs.graphql.demo
+
+import com.cubetiqs.graphql.demo.resolver.subscription.HelloSubscriptionResolver
+import com.netflix.graphql.dgs.DgsQueryExecutor
+import com.netflix.graphql.dgs.autoconfig.DgsAutoConfiguration
+import graphql.ExecutionResult
+import org.junit.jupiter.api.Test
+import org.reactivestreams.Publisher
+import org.reactivestreams.Subscriber
+import org.reactivestreams.Subscription
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.boot.test.context.SpringBootTest
+
+@SpringBootTest(
+    classes = [
+        DgsAutoConfiguration::class,
+        HelloSubscriptionResolver::class,
+    ]
+)
+class GraphqlDemoApplicationTests {
+    @Autowired
+    lateinit var dgsQueryExecutor: DgsQueryExecutor
+
+    @Test
+    fun helloSubscription() {
+        dgsQueryExecutor.execute(
+            """
+            subscription {
+              hello
+            }
+        """.trimIndent()
+        )
+            .getData<Publisher<ExecutionResult>>()
+            .subscribe(object : Subscriber<ExecutionResult> {
+                override fun onSubscribe(s: Subscription) {
+                    s.request(2)
+                }
+
+                override fun onNext(t: ExecutionResult) {
+                    println(t.getData<Any?>())
+                }
+
+                override fun onError(t: Throwable?) {
+
+                }
+
+                override fun onComplete() {
+                    println("Hello World")
+                }
+            }
+
+            )
+    }
+
+}