func TestInMemoryEventBus(t *testing.T) {
bus := cqrs.NewInMemoryEventBus()
eventType := reflect.TypeOf(SampleEvent{})
// Create communication channels
//
// for closing the queue listener,
closeChannel := make(chan chan error)
// receiving errors from the listener thread (go routine)
errorChannel := make(chan error)
// and receiving events from the queue
receiveEventChannel := make(chan cqrs.VersionedEventTransactedAccept)
// Start receiving events by passing these channels to the worker thread (go routine)
if err := bus.ReceiveEvents(cqrs.VersionedEventReceiverOptions{nil, closeChannel, errorChannel, receiveEventChannel, false}); err != nil {
t.Fatal(err)
}
// Publish a simple event
log.Println("Publishing events")
go func() {
if err := bus.PublishEvents([]cqrs.VersionedEvent{cqrs.VersionedEvent{
EventType: eventType.String(),
Event: SampleEvent{"TestInMemoryEventBus"}}}); err != nil {
t.Fatal(err)
}
}()
// If we dont receive a message within 5 seconds this test is a failure. Use a channel to signal the timeout
timeout := make(chan bool, 1)
go func() {
time.Sleep(5 * time.Second)
timeout <- true
}()
// Wait on multiple channels using the select control flow.
select {
// Test timeout
case <-timeout:
t.Fatal("Test timed out")
// Version event received channel receives a result with a channel to respond to, signifying successful processing of the message.
// This should eventually call an event handler. See cqrs.NewVersionedEventDispatcher()
case event := <-receiveEventChannel:
sampleEvent := event.Event.Event.(SampleEvent)
log.Println(sampleEvent.Message)
event.ProcessedSuccessfully <- true
// Receiving on this channel signifys an error has occured work processor side
case err := <-errorChannel:
t.Fatal(err)
}
closeResponse := make(chan error)
closeChannel <- closeResponse
<-closeResponse
}
func TestScenario(t *testing.T) {
log.SetFlags(log.LstdFlags | log.Lshortfile)
// Type Registry
typeRegistry := cqrs.NewTypeRegistry()
// Event sourcing
persistance := cqrs.NewInMemoryEventStreamRepository()
bus := cqrs.NewInMemoryEventBus()
repository := cqrs.NewRepositoryWithPublisher(persistance, bus, typeRegistry)
typeRegistry.RegisterAggregate(&Account{}, AccountCreatedEvent{}, EmailAddressChangedEvent{}, AccountCreditedEvent{}, AccountDebitedEvent{}, PasswordChangedEvent{})
// Read Models
readModel := NewReadModelAccounts()
usersModel := NewUsersModel()
// Command Handlers
commandBus := cqrs.NewInMemoryCommandBus()
commandDispatcher := cqrs.NewCommandDispatchManager(commandBus, typeRegistry)
RegisterCommandHandlers(commandDispatcher, repository)
// Integration events
eventDispatcher := cqrs.NewVersionedEventDispatchManager(bus, typeRegistry)
integrationEventsLog := cqrs.NewInMemoryEventStreamRepository()
RegisterIntegrationEventHandlers(eventDispatcher, integrationEventsLog, readModel, usersModel)
commandDispatcherStopChannel := make(chan bool)
eventDispatcherStopChannel := make(chan bool)
go commandDispatcher.Listen(commandDispatcherStopChannel, false)
go eventDispatcher.Listen(eventDispatcherStopChannel, false)
log.Println("Dump models")
log.Println(readModel)
log.Println(usersModel)
log.Println("Find an account")
readModelAccount := readModel.Accounts[accountID]
log.Println(readModelAccount)
log.Println("Find a user")
user := usersModel.Users[accountID]
log.Println(user)
hashedPassword, err := GetHashForPassword("$ThisIsMyPassword1")
if err != nil {
t.Fatal("Error: ", err)
}
log.Println("Create new account...")
createAccountCommand := cqrs.CreateCommand(
CreateAccountCommand{"John", "Snow", "*****@*****.**", hashedPassword, 0.0})
commandBus.PublishCommands([]cqrs.Command{createAccountCommand})
log.Println("Dump models")
log.Println(readModel)
log.Println(usersModel)
log.Println("Change Password")
changePasswordCommand := cqrs.CreateCommand(
ChangePasswordCommand{accountID, "$ThisIsANOTHERPassword"})
commandBus.PublishCommands([]cqrs.Command{changePasswordCommand})
log.Println("Change email address and credit the account")
changeEmailAddressCommand := cqrs.CreateCommand(
ChangeEmailAddressCommand{accountID, "*****@*****.**"})
creditAccountCommand := cqrs.CreateCommand(
CreditAccountCommand{accountID, 50})
creditAccountCommand2 := cqrs.CreateCommand(
CreditAccountCommand{accountID, 50})
commandBus.PublishCommands([]cqrs.Command{
changeEmailAddressCommand,
creditAccountCommand,
creditAccountCommand2})
log.Println("Dump models")
log.Println(readModel)
log.Println(usersModel)
log.Println("Change the email address, credit 150, debit 200")
lastEmailAddress := "*****@*****.**"
changeEmailAddressCommand = cqrs.CreateCommand(
ChangeEmailAddressCommand{accountID, lastEmailAddress})
creditAccountCommand = cqrs.CreateCommand(
CreditAccountCommand{accountID, 150})
debitAccountCommand := cqrs.CreateCommand(
DebitAccountCommand{accountID, 200})
commandBus.PublishCommands([]cqrs.Command{
changeEmailAddressCommand,
creditAccountCommand,
debitAccountCommand})
log.Println("Dump models")
log.Println(readModel)
log.Println(usersModel)
time.Sleep(300 * time.Millisecond)
log.Println("Dump history - integration events")
if history, err := repository.GetEventStreamRepository().AllIntegrationEventsEverPublished(); err != nil {
t.Fatal(err)
} else {
for _, event := range history {
log.Println(event)
}
}
log.Println("GetIntegrationEventsByCorrelationID")
correlationEvents, err := repository.GetEventStreamRepository().GetIntegrationEventsByCorrelationID(debitAccountCommand.CorrelationID)
if err != nil || len(correlationEvents) == 0 {
t.Fatal(err)
}
for correlationEvent := range correlationEvents {
log.Println(correlationEvent)
}
log.Println("Load the account from history")
account, error := NewAccountFromHistory(accountID, repository)
if error != nil {
t.Fatal(error)
}
// All events should have been replayed and the email address should be the latest
log.Println("Dump models")
log.Println(account)
log.Println(readModel)
log.Println(usersModel)
if account.EmailAddress != lastEmailAddress {
t.Fatal("Expected emailaddress to be ", lastEmailAddress)
}
if account.Balance != readModel.Accounts[accountID].Balance {
t.Fatal("Expected readmodel to be synced with write model")
}
eventDispatcherStopChannel <- true
commandDispatcherStopChannel <- true
}