Fix db health check

simplenotes-app/build.gradle.kts

@@ -10,8 +10,6 @@ plugins {
 }
 
 dependencies {
-    implementation(project(":simplenotes-persistance"))
-    implementation(project(":simplenotes-search"))
     implementation(project(":simplenotes-domain"))
     implementation(project(":simplenotes-types"))
     implementation(project(":simplenotes-config"))
@@ -25,7 +23,6 @@ dependencies {
     implementation(Libs.javaxServlet)
     implementation(Libs.kotlinxSerializationJson)
     implementation(Libs.logbackClassic)
-    implementation(Libs.ktormCore)
 
     implementation(Libs.micronaut)
     kapt(Libs.micronautProcessor)

simplenotes-app/src/main/kotlin/be/simplenotes/app/api/ApiNoteController.kt

@@ -1,7 +1,6 @@
 package be.simplenotes.app.api
 
 import be.simplenotes.app.extensions.auto
-import be.simplenotes.app.utils.parseSearchTerms
 import be.simplenotes.domain.usecases.NoteService
 import be.simplenotes.types.LoggedInUser
 import be.simplenotes.types.PersistedNote
@@ -58,8 +57,7 @@ class ApiNoteController(
 
     fun search(request: Request, loggedInUser: LoggedInUser): Response {
         val query = searchContentLens(request)
-        val terms = parseSearchTerms(query)
-        val notes = noteService.search(loggedInUser.userId, terms)
+        val notes = noteService.search(loggedInUser.userId, query)
         return persistedNotesMetadataLens(notes, Response(OK))
     }
 

simplenotes-app/src/main/kotlin/be/simplenotes/app/controllers/HealthCheckController.kt

@@ -1,6 +1,6 @@
 package be.simplenotes.app.controllers
 
-import be.simplenotes.persistance.DbHealthCheck
+import be.simplenotes.domain.usecases.HealthCheckService
 import org.http4k.core.Request
 import org.http4k.core.Response
 import org.http4k.core.Status.Companion.OK
@@ -8,7 +8,7 @@ import org.http4k.core.Status.Companion.SERVICE_UNAVAILABLE
 import javax.inject.Singleton
 
 @Singleton
-class HealthCheckController(private val dbHealthCheck: DbHealthCheck) {
+class HealthCheckController(private val healthCheckService: HealthCheckService) {
     fun healthCheck(@Suppress("UNUSED_PARAMETER") request: Request) =
-        if (dbHealthCheck.isOk()) Response(OK) else Response(SERVICE_UNAVAILABLE)
+        if (healthCheckService.isOk()) Response(OK) else Response(SERVICE_UNAVAILABLE)
 }

simplenotes-app/src/main/kotlin/be/simplenotes/app/controllers/NoteController.kt

@@ -2,7 +2,6 @@ package be.simplenotes.app.controllers
 
 import be.simplenotes.app.extensions.html
 import be.simplenotes.app.extensions.redirect
-import be.simplenotes.app.utils.parseSearchTerms
 import be.simplenotes.domain.usecases.NoteService
 import be.simplenotes.domain.usecases.markdown.InvalidMeta
 import be.simplenotes.domain.usecases.markdown.MissingMeta
@@ -69,8 +68,7 @@ class NoteController(
 
     fun search(request: Request, loggedInUser: LoggedInUser): Response {
         val query = request.form("search") ?: ""
-        val terms = parseSearchTerms(query)
-        val notes = noteService.search(loggedInUser.userId, terms)
+        val notes = noteService.search(loggedInUser.userId, query)
         val deletedCount = noteService.countDeleted(loggedInUser.userId)
         return Response(OK).html(view.search(loggedInUser, notes, query, deletedCount))
     }

simplenotes-app/src/main/kotlin/be/simplenotes/app/filters/TransactionFilter.kt

@@ -1,15 +0,0 @@
-package be.simplenotes.app.filters
-
-import me.liuwj.ktorm.database.Database
-import org.http4k.core.Filter
-import org.http4k.core.HttpHandler
-import javax.inject.Singleton
-
-@Singleton
-class TransactionFilter(private val db: Database) : Filter {
-    override fun invoke(next: HttpHandler): HttpHandler = { request ->
-        db.useTransaction {
-            next(request)
-        }
-    }
-}

simplenotes-app/src/main/kotlin/be/simplenotes/app/routes/ApiRoutes.kt

@@ -2,10 +2,8 @@ package be.simplenotes.app.routes
 
 import be.simplenotes.app.api.ApiNoteController
 import be.simplenotes.app.api.ApiUserController
-import be.simplenotes.app.filters.TransactionFilter
 import be.simplenotes.app.filters.auth.RequiredAuthFilter
 import be.simplenotes.app.filters.auth.RequiredAuthLens
-import org.http4k.core.Filter
 import org.http4k.core.Method.*
 import org.http4k.core.Request
 import org.http4k.core.then
@@ -21,16 +19,11 @@ import javax.inject.Singleton
 class ApiRoutes(
     private val apiUserController: ApiUserController,
     private val apiNoteController: ApiNoteController,
-    private val transaction: TransactionFilter,
     @Named("api") private val auth: RequiredAuthFilter,
     @Named("required") private val authLens: RequiredAuthLens,
 ) : Supplier<RoutingHttpHandler> {
     override fun get(): RoutingHttpHandler {
 
-        fun Filter.then(next: ProtectedHandler) = then { req: Request ->
-            next(req, authLens(req))
-        }
-
         infix fun PathMethod.to(action: ProtectedHandler) =
             this to { req: Request -> action(req, authLens(req)) }
 
@@ -41,10 +34,10 @@ class ApiRoutes(
                 auth.then(
                     routes(
                         "/" bind GET to ::notes,
-                        "/" bind POST to transaction.then(::createNote),
+                        "/" bind POST to ::createNote,
                         "/search" bind POST to ::search,
                         "/{uuid}" bind GET to ::note,
-                        "/{uuid}" bind PUT to transaction.then(::update),
+                        "/{uuid}" bind PUT to ::update,
                     )
                 ).withBasePath("/notes")
             }

simplenotes-app/src/main/kotlin/be/simplenotes/app/routes/BasicRoutes.kt

@@ -5,11 +5,9 @@ import be.simplenotes.app.controllers.HealthCheckController
 import be.simplenotes.app.controllers.NoteController
 import be.simplenotes.app.controllers.UserController
 import be.simplenotes.app.filters.ImmutableFilter
-import be.simplenotes.app.filters.TransactionFilter
 import be.simplenotes.app.filters.auth.OptionalAuthFilter
 import be.simplenotes.app.filters.auth.OptionalAuthLens
 import org.http4k.core.ContentType
-import org.http4k.core.Filter
 import org.http4k.core.Method.GET
 import org.http4k.core.Method.POST
 import org.http4k.core.Request
@@ -27,15 +25,10 @@ class BasicRoutes(
     private val noteCtrl: NoteController,
     @Named("optional") private val authLens: OptionalAuthLens,
     private val auth: OptionalAuthFilter,
-    private val transactionFilter: TransactionFilter,
 ) : Supplier<RoutingHttpHandler> {
 
     override fun get(): RoutingHttpHandler {
 
-        fun Filter.then(next: PublicHandler) = then { req: Request ->
-            next(req, authLens(req))
-        }
-
         infix fun PathMethod.to(action: PublicHandler) =
             this to { req: Request -> action(req, authLens(req)) }
 
@@ -52,7 +45,7 @@ class BasicRoutes(
                 routes(
                     "/" bind GET to baseCtrl::index,
                     "/register" bind GET to userCtrl::register,
-                    "/register" bind POST to transactionFilter.then(userCtrl::register),
+                    "/register" bind POST to userCtrl::register,
                     "/login" bind GET to userCtrl::login,
                     "/login" bind POST to userCtrl::login,
                     "/logout" bind POST to userCtrl::logout,

simplenotes-app/src/main/kotlin/be/simplenotes/app/routes/NoteRoutes.kt

@@ -1,10 +1,8 @@
 package be.simplenotes.app.routes
 
 import be.simplenotes.app.controllers.NoteController
-import be.simplenotes.app.filters.TransactionFilter
 import be.simplenotes.app.filters.auth.RequiredAuthFilter
 import be.simplenotes.app.filters.auth.RequiredAuthLens
-import org.http4k.core.Filter
 import org.http4k.core.Method.GET
 import org.http4k.core.Method.POST
 import org.http4k.core.Request
@@ -20,16 +18,11 @@ import javax.inject.Singleton
 @Singleton
 class NoteRoutes(
     private val noteCtrl: NoteController,
-    private val transaction: TransactionFilter,
     private val auth: RequiredAuthFilter,
     @Named("required") private val authLens: RequiredAuthLens,
 ) : Supplier<RoutingHttpHandler> {
     override fun get(): RoutingHttpHandler {
 
-        fun Filter.then(next: ProtectedHandler) = then { req: Request ->
-            next(req, authLens(req))
-        }
-
         infix fun PathMethod.to(action: ProtectedHandler) =
             this to { req: Request -> action(req, authLens(req)) }
 
@@ -39,13 +32,13 @@ class NoteRoutes(
                     "/" bind GET to ::list,
                     "/" bind POST to ::search,
                     "/new" bind GET to ::new,
-                    "/new" bind POST to transaction.then(::new),
+                    "/new" bind POST to ::new,
                     "/trash" bind GET to ::trash,
                     "/{uuid}" bind GET to ::note,
-                    "/{uuid}" bind POST to transaction.then(::note),
+                    "/{uuid}" bind POST to ::note,
                     "/{uuid}/edit" bind GET to ::edit,
-                    "/{uuid}/edit" bind POST to transaction.then(::edit),
-                    "/deleted/{uuid}" bind POST to transaction.then(::deleted),
+                    "/{uuid}/edit" bind POST to ::edit,
+                    "/deleted/{uuid}" bind POST to ::deleted,
                 ).withBasePath("/notes")
             }
         )

simplenotes-app/src/main/kotlin/be/simplenotes/app/routes/SettingsRoutes.kt

@@ -1,10 +1,8 @@
 package be.simplenotes.app.routes
 
 import be.simplenotes.app.controllers.SettingsController
-import be.simplenotes.app.filters.TransactionFilter
 import be.simplenotes.app.filters.auth.RequiredAuthFilter
 import be.simplenotes.app.filters.auth.RequiredAuthLens
-import org.http4k.core.Filter
 import org.http4k.core.Method.GET
 import org.http4k.core.Method.POST
 import org.http4k.core.Request
@@ -20,23 +18,18 @@ import javax.inject.Singleton
 @Singleton
 class SettingsRoutes(
     private val settingsController: SettingsController,
-    private val transaction: TransactionFilter,
     private val auth: RequiredAuthFilter,
     @Named("required") private val authLens: RequiredAuthLens,
 ) : Supplier<RoutingHttpHandler> {
     override fun get(): RoutingHttpHandler {
 
-        fun Filter.then(next: ProtectedHandler) = then { req: Request ->
-            next(req, authLens(req))
-        }
-
         infix fun PathMethod.to(action: ProtectedHandler) =
             this to { req: Request -> action(req, authLens(req)) }
 
         return auth.then(
             routes(
                 "/settings" bind GET to settingsController::settings,
-                "/settings" bind POST to transaction.then(settingsController::settings),
+                "/settings" bind POST to settingsController::settings,
                 "/export" bind POST to settingsController::export,
             )
         )

simplenotes-domain/src/main/kotlin/be/simplenotes/domain/usecases/HealthCheckService.kt

@@ -0,0 +1,13 @@
+package be.simplenotes.domain.usecases
+
+import be.simplenotes.persistance.DbHealthCheck
+import javax.inject.Singleton
+
+interface HealthCheckService {
+    fun isOk(): Boolean
+}
+
+@Singleton
+class HealthCheckServiceImpl(private val dbHealthCheck: DbHealthCheck) : HealthCheckService {
+    override fun isOk() = dbHealthCheck.isOk()
+}

simplenotes-domain/src/main/kotlin/be/simplenotes/domain/usecases/NoteService.kt

@@ -4,10 +4,11 @@ import arrow.core.computations.either
 import be.simplenotes.domain.security.HtmlSanitizer
 import be.simplenotes.domain.usecases.markdown.MarkdownConverter
 import be.simplenotes.domain.usecases.markdown.MarkdownParsingError
+import be.simplenotes.domain.usecases.search.parseSearchTerms
 import be.simplenotes.persistance.repositories.NoteRepository
 import be.simplenotes.persistance.repositories.UserRepository
+import be.simplenotes.persistance.transactions.TransactionService
 import be.simplenotes.search.NoteSearcher
-import be.simplenotes.search.SearchTerms
 import be.simplenotes.types.LoggedInUser
 import be.simplenotes.types.Note
 import be.simplenotes.types.PersistedNote
@@ -24,30 +25,35 @@ class NoteService(
     private val userRepository: UserRepository,
     private val searcher: NoteSearcher,
     private val htmlSanitizer: HtmlSanitizer,
+    private val transaction: TransactionService,
 ) {
 
-    fun create(user: LoggedInUser, markdownText: String) = either.eager<MarkdownParsingError, PersistedNote> {
-        val persistedNote = !markdownConverter.renderDocument(markdownText)
-            .map { it.copy(html = htmlSanitizer.sanitize(user, it.html)) }
-            .map { Note(it.metadata, markdown = markdownText, html = it.html) }
-            .map { noteRepository.create(user.userId, it) }
+    fun create(user: LoggedInUser, markdownText: String) = transaction.use {
+        either.eager<MarkdownParsingError, PersistedNote> {
+            val persistedNote = !markdownConverter.renderDocument(markdownText)
+                .map { it.copy(html = htmlSanitizer.sanitize(user, it.html)) }
+                .map { Note(it.metadata, markdown = markdownText, html = it.html) }
+                .map { noteRepository.create(user.userId, it) }
 
-        searcher.indexNote(user.userId, persistedNote)
-        persistedNote
+            searcher.indexNote(user.userId, persistedNote)
+            persistedNote
+        }
     }
 
     fun update(
         user: LoggedInUser,
         uuid: UUID,
         markdownText: String,
-    ) = either.eager<MarkdownParsingError, PersistedNote?> {
-        val persistedNote = !markdownConverter.renderDocument(markdownText)
-            .map { it.copy(html = htmlSanitizer.sanitize(user, it.html)) }
-            .map { Note(it.metadata, markdown = markdownText, html = it.html) }
-            .map { noteRepository.update(user.userId, uuid, it) }
+    ) = transaction.use {
+        either.eager<MarkdownParsingError, PersistedNote?> {
+            val persistedNote = !markdownConverter.renderDocument(markdownText)
+                .map { it.copy(html = htmlSanitizer.sanitize(user, it.html)) }
+                .map { Note(it.metadata, markdown = markdownText, html = it.html) }
+                .map { noteRepository.update(user.userId, uuid, it) }
 
-        persistedNote?.let { searcher.updateIndex(user.userId, it) }
-        persistedNote
+            persistedNote?.let { searcher.updateIndex(user.userId, it) }
+            persistedNote
+        }
     }
 
     fun paginatedNotes(
@@ -66,22 +72,22 @@ class NoteService(
 
     fun find(userId: Int, uuid: UUID) = noteRepository.find(userId, uuid)
 
-    fun trash(userId: Int, uuid: UUID): Boolean {
+    fun trash(userId: Int, uuid: UUID): Boolean = transaction.use {
         val res = noteRepository.delete(userId, uuid, permanent = false)
         if (res) searcher.deleteIndex(userId, uuid)
-        return res
+        res
     }
 
-    fun restore(userId: Int, uuid: UUID): Boolean {
+    fun restore(userId: Int, uuid: UUID): Boolean = transaction.use {
         val res = noteRepository.restore(userId, uuid)
         if (res) find(userId, uuid)?.let { note -> searcher.indexNote(userId, note) }
-        return res
+        res
     }
 
-    fun delete(userId: Int, uuid: UUID): Boolean {
+    fun delete(userId: Int, uuid: UUID): Boolean = transaction.use {
         val res = noteRepository.delete(userId, uuid, permanent = true)
         if (res) searcher.deleteIndex(userId, uuid)
-        return res
+        res
     }
 
     fun countDeleted(userId: Int) = noteRepository.count(userId, deleted = true)
@@ -96,13 +102,13 @@ class NoteService(
         }
     }
 
-    fun search(userId: Int, searchTerms: SearchTerms) = searcher.search(userId, searchTerms)
+    fun search(userId: Int, searchInput: String) = searcher.search(userId, parseSearchTerms(searchInput))
 
     @PreDestroy
     fun dropAllIndexes() = searcher.dropAll()
 
-    fun makePublic(userId: Int, uuid: UUID) = noteRepository.makePublic(userId, uuid)
-    fun makePrivate(userId: Int, uuid: UUID) = noteRepository.makePrivate(userId, uuid)
+    fun makePublic(userId: Int, uuid: UUID) = transaction.use { noteRepository.makePublic(userId, uuid) }
+    fun makePrivate(userId: Int, uuid: UUID) = transaction.use { noteRepository.makePrivate(userId, uuid) }
     fun findPublic(uuid: UUID) = noteRepository.findPublic(uuid)
 }
 

simplenotes-domain/src/main/kotlin/be/simplenotes/domain/usecases/search/SearchTermsParser.kt

@@ -1,4 +1,4 @@
-package be.simplenotes.app.utils
+package be.simplenotes.domain.usecases.search
 
 import be.simplenotes.search.SearchTerms
 
@@ -16,7 +16,7 @@ private val outerTagRe = outerRegex("tag")
 private val contentRe = innerRegex("content")
 private val outerContentRe = outerRegex("content")
 
-fun parseSearchTerms(input: String): SearchTerms {
+internal fun parseSearchTerms(input: String): SearchTerms {
     var c: String = input
 
     fun extract(innerRegex: Regex, outerRegex: Regex): String? {

simplenotes-domain/src/main/kotlin/be/simplenotes/domain/usecases/users/delete/DeleteUseCaseImpl.kt

@@ -6,6 +6,7 @@ import arrow.core.rightIfNotNull
 import be.simplenotes.domain.security.PasswordHash
 import be.simplenotes.domain.validation.UserValidations
 import be.simplenotes.persistance.repositories.UserRepository
+import be.simplenotes.persistance.transactions.TransactionService
 import be.simplenotes.search.NoteSearcher
 import io.micronaut.context.annotation.Primary
 import javax.inject.Singleton
@@ -16,16 +17,19 @@ internal class DeleteUseCaseImpl(
     private val userRepository: UserRepository,
     private val passwordHash: PasswordHash,
     private val searcher: NoteSearcher,
+    private val transactionService: TransactionService,
 ) : DeleteUseCase {
-    override fun delete(form: DeleteForm) = either.eager<DeleteError, Unit> {
-        val user = !UserValidations.validateDelete(form)
-        val persistedUser = !userRepository.find(user.username).rightIfNotNull { DeleteError.Unregistered }
-        !Either.conditionally(
-            passwordHash.verify(user.password, persistedUser.password),
-            { DeleteError.WrongPassword },
-            { Unit }
-        )
-        !Either.conditionally(userRepository.delete(persistedUser.id), { DeleteError.Unregistered }, { Unit })
-        searcher.dropIndex(persistedUser.id)
+    override fun delete(form: DeleteForm) = transactionService.use {
+        either.eager<DeleteError, Unit> {
+            val user = !UserValidations.validateDelete(form)
+            val persistedUser = !userRepository.find(user.username).rightIfNotNull { DeleteError.Unregistered }
+            !Either.conditionally(
+                passwordHash.verify(user.password, persistedUser.password),
+                { DeleteError.WrongPassword },
+                { Unit }
+            )
+            !Either.conditionally(userRepository.delete(persistedUser.id), { DeleteError.Unregistered }, { Unit })
+            searcher.dropIndex(persistedUser.id)
+        }
     }
 }

simplenotes-domain/src/main/kotlin/be/simplenotes/domain/usecases/users/register/RegisterUseCaseImpl.kt

@@ -6,6 +6,7 @@ import arrow.core.leftIfNull
 import be.simplenotes.domain.security.PasswordHash
 import be.simplenotes.domain.validation.UserValidations
 import be.simplenotes.persistance.repositories.UserRepository
+import be.simplenotes.persistance.transactions.TransactionService
 import be.simplenotes.types.PersistedUser
 import io.micronaut.context.annotation.Primary
 import javax.inject.Singleton
@@ -14,10 +15,11 @@ import javax.inject.Singleton
 @Singleton
 internal class RegisterUseCaseImpl(
     private val userRepository: UserRepository,
-    private val passwordHash: PasswordHash
+    private val passwordHash: PasswordHash,
+    private val transactionService: TransactionService,
 ) : RegisterUseCase {
-    override fun register(form: RegisterForm): Either<RegisterError, PersistedUser> {
-        return UserValidations.validateRegister(form)
+    override fun register(form: RegisterForm): Either<RegisterError, PersistedUser> = transactionService.use {
+        UserValidations.validateRegister(form)
             .filterOrElse({ !userRepository.exists(it.username) }, { UserExists })
             .map { it.copy(password = passwordHash.crypt(it.password)) }
             .map { userRepository.create(it) }

simplenotes-domain/src/test/kotlin/be/simplenotes/domain/usecases/search/SearchTermsParserKtTest.kt

@@ -1,7 +1,8 @@
-package be.simplenotes.app.utils
+package be.simplenotes.domain.usecases.search
 
 import be.simplenotes.search.SearchTerms
-import org.assertj.core.api.Assertions.assertThat
+import com.natpryce.hamkrest.assertion.assertThat
+import com.natpryce.hamkrest.equalTo
 import org.junit.jupiter.params.ParameterizedTest
 import org.junit.jupiter.params.provider.MethodSource
 import java.util.stream.Stream
@@ -13,7 +14,7 @@ internal class SearchTermsParserKtTest {
         title: String? = null,
         tag: String? = null,
         content: String? = null,
-        all: String? = null
+        all: String? = null,
     ): Pair<String, SearchTerms> = input to SearchTerms(title, tag, content, all)
 
     @Suppress("Unused")
@@ -39,6 +40,6 @@ internal class SearchTermsParserKtTest {
     @ParameterizedTest
     @MethodSource("results")
     fun `valid search parser`(case: Pair<String, SearchTerms>) {
-        assertThat(parseSearchTerms(case.first)).isEqualTo(case.second)
+        assertThat(parseSearchTerms(case.first), equalTo(case.second))
     }
 }

simplenotes-domain/src/test/kotlin/be/simplenotes/domain/usecases/users/register/RegisterUseCaseImplTest.kt

@@ -4,6 +4,7 @@ import be.simplenotes.domain.security.BcryptPasswordHash
 import be.simplenotes.domain.testutils.isLeftOfType
 import be.simplenotes.domain.testutils.isRight
 import be.simplenotes.persistance.repositories.UserRepository
+import be.simplenotes.persistance.transactions.TransactionService
 import be.simplenotes.types.PersistedUser
 import com.natpryce.hamkrest.assertion.assertThat
 import com.natpryce.hamkrest.equalTo
@@ -16,7 +17,10 @@ internal class RegisterUseCaseImplTest {
     // region setup
     private val mockUserRepository = mockk<UserRepository>()
     private val passwordHash = BcryptPasswordHash(test = true)
-    private val registerUseCase = RegisterUseCaseImpl(mockUserRepository, passwordHash)
+    private val noopTransactionService = object : TransactionService {
+        override fun <T> use(block: () -> T) = block()
+    }
+    private val registerUseCase = RegisterUseCaseImpl(mockUserRepository, passwordHash, noopTransactionService)
 
     @BeforeEach
     fun resetMocks() {

simplenotes-persistance/src/main/kotlin/be/simplenotes/persistance/HealthCheck.kt

@@ -6,8 +6,7 @@ import be.simplenotes.persistance.utils.type
 import me.liuwj.ktorm.database.Database
 import me.liuwj.ktorm.database.asIterable
 import me.liuwj.ktorm.database.use
-import java.io.EOFException
-import java.sql.SQLTransientException
+import java.sql.SQLException
 import javax.inject.Singleton
 
 interface DbHealthCheck {
@@ -26,9 +25,7 @@ internal class DbHealthCheckImpl(
                 it.executeQuery().asIterable().map { it.getString(1) }
             }
         }.any { it in dataSourceConfig.jdbcUrl }
-    } catch (e: SQLTransientException) {
-        false
-    } catch (e: EOFException) {
+    } catch (e: SQLException) {
         false
     }
 }

simplenotes-persistance/src/main/kotlin/be/simplenotes/persistance/transactions/KtormTransactionService.kt

@@ -0,0 +1,9 @@
+package be.simplenotes.persistance.transactions
+
+import me.liuwj.ktorm.database.Database
+import javax.inject.Singleton
+
+@Singleton
+internal class KtormTransactionService(private val database: Database) : TransactionService {
+    override fun <T> use(block: () -> T) = database.useTransaction { block() }
+}

simplenotes-persistance/src/main/kotlin/be/simplenotes/persistance/transactions/TransactionService.kt

@@ -0,0 +1,5 @@
+package be.simplenotes.persistance.transactions
+
+interface TransactionService {
+    fun <T> use(block: () -> T): T
+}