add projection

add dtos
Add exception for account
add repository
add account service command

src/main/kotlin/com/cubetiqs/demo/axon/AxonApplication.kt

@@ -1,15 +1,11 @@
 package com.cubetiqs.demo.axon
 
-import com.cubetiqs.demo.axon.entity.BankAccount
 import org.springframework.boot.autoconfigure.SpringBootApplication
 import org.springframework.boot.runApplication
-import org.springframework.data.jpa.repository.JpaRepository
 import org.springframework.http.ResponseEntity
-import org.springframework.stereotype.Repository
 import org.springframework.web.bind.annotation.GetMapping
 import org.springframework.web.bind.annotation.RequestMapping
 import org.springframework.web.bind.annotation.RestController
-import java.util.UUID
 
 @SpringBootApplication
 class AxonApplication
@@ -25,7 +21,4 @@ class DefaultController {
     fun index(): ResponseEntity<Any> {
         return ResponseEntity.ok("ok")
     }
-}
-
-@Repository
-interface BankAccountRepository : JpaRepository<BankAccount, UUID>
+}

src/main/kotlin/com/cubetiqs/demo/axon/dto/AccountCreationDTO.kt

@@ -0,0 +1,8 @@
+package com.cubetiqs.demo.axon.dto
+
+import java.math.BigDecimal
+
+data class AccountCreationDTO(
+    var initialBalance: BigDecimal? = null,
+    var owner: String? = null
+)

src/main/kotlin/com/cubetiqs/demo/axon/dto/MoneyAmountDTO.kt

@@ -0,0 +1,7 @@
+package com.cubetiqs.demo.axon.dto
+
+import java.math.BigDecimal
+
+data class MoneyAmountDTO(
+    var amount: BigDecimal? = null
+)

src/main/kotlin/com/cubetiqs/demo/axon/exception/AccountNotFoundException.kt

@@ -0,0 +1,5 @@
+package com.cubetiqs.demo.axon.exception
+
+import java.util.UUID
+
+class AccountNotFoundException(id: UUID?) : Throwable("Cannot found account number [$id]")

src/main/kotlin/com/cubetiqs/demo/axon/projection/BankAccountProjection.kt

@@ -0,0 +1,59 @@
+package com.cubetiqs.demo.axon.projection
+
+import com.cubetiqs.demo.axon.entity.BankAccount
+import com.cubetiqs.demo.axon.event.AccountCreatedEvent
+import com.cubetiqs.demo.axon.event.MoneyCreditedEvent
+import com.cubetiqs.demo.axon.event.MoneyDebitedEvent
+import com.cubetiqs.demo.axon.exception.AccountNotFoundException
+import com.cubetiqs.demo.axon.repository.BankAccountRepository
+import org.axonframework.eventhandling.EventHandler
+import org.slf4j.LoggerFactory
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.stereotype.Component
+import java.util.Optional
+
+@Component
+class BankAccountProjection @Autowired constructor(
+    private val bankAccountRepository: BankAccountRepository
+) {
+    private val log = LoggerFactory.getLogger(this.javaClass)
+
+    @EventHandler
+    fun on(event: AccountCreatedEvent) {
+        log.debug("Handling a Bank Account creation command {}", event.id)
+        val bankAccount = BankAccount(
+            event.id,
+            event.owner,
+            event.initialBalance
+        )
+        this.bankAccountRepository.save(bankAccount)
+    }
+
+    @EventHandler
+    @Throws(AccountNotFoundException::class)
+    fun on(event: MoneyCreditedEvent) {
+        log.debug("Handling an Account Credit command {}", event.accountId)
+        val optionalBankAccount: Optional<BankAccount> = this.bankAccountRepository.findById(event.accountId!!)
+        if (optionalBankAccount.isPresent) {
+            val bankAccount: BankAccount = optionalBankAccount.get()
+            bankAccount.balance = bankAccount.balance!!.add(event.creditAmount)
+            this.bankAccountRepository.save(bankAccount)
+        } else {
+            throw AccountNotFoundException(event.accountId)
+        }
+    }
+
+    @EventHandler
+    @Throws(AccountNotFoundException::class)
+    fun on(event: MoneyDebitedEvent) {
+        log.debug("Handling an Account Debit command {}", event.accountId)
+        val optionalBankAccount: Optional<BankAccount> = this.bankAccountRepository.findById(event.accountId!!)
+        if (optionalBankAccount.isPresent) {
+            val bankAccount: BankAccount = optionalBankAccount.get()
+            bankAccount.balance = bankAccount.balance!!.subtract(event.debitAmount)
+            this.bankAccountRepository.save(bankAccount)
+        } else {
+            throw AccountNotFoundException(event.accountId)
+        }
+    }
+}

src/main/kotlin/com/cubetiqs/demo/axon/query/FindBankAccountQuery.kt

@@ -0,0 +1,7 @@
+package com.cubetiqs.demo.axon.query
+
+import java.util.UUID
+
+data class FindBankAccountQuery(
+    val id: UUID
+)

src/main/kotlin/com/cubetiqs/demo/axon/repository/BankAccountRepository.kt

@@ -0,0 +1,9 @@
+package com.cubetiqs.demo.axon.repository
+
+import com.cubetiqs.demo.axon.entity.BankAccount
+import org.springframework.data.jpa.repository.JpaRepository
+import org.springframework.stereotype.Repository
+import java.util.UUID
+
+@Repository
+interface BankAccountRepository : JpaRepository<BankAccount, UUID>

src/main/kotlin/com/cubetiqs/demo/axon/service/AccountCommandService.kt

@@ -0,0 +1,22 @@
+package com.cubetiqs.demo.axon.service
+
+import com.cubetiqs.demo.axon.dto.AccountCreationDTO
+import com.cubetiqs.demo.axon.dto.MoneyAmountDTO
+import com.cubetiqs.demo.axon.entity.BankAccount
+import org.springframework.stereotype.Service
+import java.util.concurrent.CompletableFuture
+
+@Service
+interface AccountCommandService {
+    fun createAccount(creationDTO: AccountCreationDTO): CompletableFuture<BankAccount?>
+
+    fun creditMoneyToAccount(
+        accountId: String?,
+        moneyCreditDTO: MoneyAmountDTO
+    ): CompletableFuture<String?>
+
+    fun debitMoneyFromAccount(
+        accountId: String?,
+        moneyDebitDTO: MoneyAmountDTO
+    ): CompletableFuture<String?>
+}

src/main/kotlin/com/cubetiqs/demo/axon/service/AccountCommandServiceImpl.kt

@@ -0,0 +1,50 @@
+package com.cubetiqs.demo.axon.service
+
+import com.cubetiqs.demo.axon.command.CreateAccountCommand
+import com.cubetiqs.demo.axon.command.CreditMoneyCommand
+import com.cubetiqs.demo.axon.command.DebitMoneyCommand
+import com.cubetiqs.demo.axon.dto.AccountCreationDTO
+import com.cubetiqs.demo.axon.dto.MoneyAmountDTO
+import com.cubetiqs.demo.axon.entity.BankAccount
+import org.axonframework.commandhandling.gateway.CommandGateway
+import org.springframework.beans.factory.annotation.Autowired
+import org.springframework.stereotype.Service
+import java.util.UUID
+import java.util.concurrent.CompletableFuture
+
+@Service
+class AccountCommandServiceImpl @Autowired constructor(
+    private val commandGateway: CommandGateway
+) : AccountCommandService {
+    override fun createAccount(creationDTO: AccountCreationDTO): CompletableFuture<BankAccount?> {
+        return commandGateway.send(
+            CreateAccountCommand(
+                UUID.randomUUID(),
+                creationDTO.initialBalance,
+                creationDTO.owner,
+            )
+        )
+    }
+
+    override fun creditMoneyToAccount(accountId: String?, moneyCreditDTO: MoneyAmountDTO): CompletableFuture<String?> {
+        return commandGateway.send(
+            CreditMoneyCommand(
+                formatUuid(accountId),
+                moneyCreditDTO.amount
+            )
+        )
+    }
+
+    override fun debitMoneyFromAccount(accountId: String?, moneyDebitDTO: MoneyAmountDTO): CompletableFuture<String?> {
+        return commandGateway.send(
+            DebitMoneyCommand(
+                formatUuid(accountId),
+                moneyDebitDTO.amount
+            )
+        )
+    }
+
+    private fun formatUuid(accountId: String?): UUID {
+        return UUID.fromString(accountId)
+    }
+}