Async-Spring-Kotlin-JOOQ-Demo/src/main/kotlin/com/example/demo/service/UserService.kt

package com.example.demo.service

import com.example.demo.model.User
import com.example.demo.model.test_db.Tables
import com.example.demo.model.test_db.Tables.MESSAGES
import com.example.demo.model.test_db.tables.Users.USERS
import kotlinx.coroutines.flow.Flow
import kotlinx.coroutines.flow.asFlow
import org.jooq.DSLContext
import org.springframework.beans.factory.annotation.Autowired
import org.springframework.context.annotation.Lazy
import org.springframework.stereotype.Service
import reactor.core.publisher.Flux


@Service
@Lazy
class UserService(@Autowired @Lazy private val dsl: DSLContext) {

    fun users(): Flux<User> {
        return Flux
                .from(dsl
                    .select()
                    .from(Tables.USERS))
                    .map {
                        User(it.get(USERS.ID), it.get(USERS.NAME))
                    }
    }

    suspend fun users2(): Flow<User> {
        return dsl
            .select()
            .from(USERS)
            .fetch()
            .map { userRecord ->
                User(userRecord.get(USERS.ID), userRecord.get(USERS.NAME))
            }
            .asFlow()
    }

    suspend fun getUserMessages(userName: String): Flow<String> = dsl
            .select(MESSAGES.MESSAGE).from(MESSAGES, USERS)
            .where(MESSAGES.USER_ID.eq(USERS.ID), USERS.NAME.eq(userName))
            .fetch()
            .map { it.get(MESSAGES.MESSAGE) }
            .asFlow()


}