Fluent api design

Mar 3, 20130 likes226 views

Joar Øyen

Short talk about designing user friendly APIs in C#

Innpakking av kompleks tredjeparts bibliotek
Slike biblioteker har typisk funksjonalitet du ikke trenger
Hvorfor?
Veileder brukeren (dvs. utvikleren) hva som er semantisk
gyldig i henhold til forretningsregler, og ikke bare hva som
syntaktisk er mulig

Lesbarhet

Alternativ til
über-klasse som parameter
Når? lang liste av overloads
deklarativ konfigurasjon

Biblioteker som i stor grad skal benyttes av andre

For komplekse API som brukes sjelden (dvs. at
kompleksiteten brukes sjelden)

Mikroskopisk domenespesifikt språk

Hvordan? Builder pattern

Det mest vanlige skal alltid resultere i enklest (minst) kode

Ordenes rekkefølge er viktig

Ett eller flere startpunkt
Interface med tilhørende implementasjon
Statisk wrapper
Extension metoder

Log.Message(
"Ingen tilgang til {0}. Verifiser at serveren er tilgjengelig.",
FilePath);
Eksempler
Log.Message(
42,
"Ingen tilgang til {0}. Verifiser at serveren er tilgjengelig.",
FilePath);

Log.Message(Resources.NoAccessToResource, FilePath);

Log.Exception(new TimeoutException("Test"), "Message");

Log.UnhandledException(new TimeoutException("Message"));

Log.Warning.Exception(new TimeoutException("Message"));

Log.Information.To("Debug").Message("Message");

Debug.Message("Message");

Fra ett metodekall til 5 interfaces og 11 klasser
Hva har vi Fra «über klasse» og «overloads from hell» til «train wreck»
oppnådd?
Syntaktisk sukker
Log Message

Error
Exception

Warning To

Information

UnhandledException

Det mest vanlige blir veldig enkelt
Veiviser for utviklere for avanserte scenarioer
Lesbar og testbar kode

Vær konsistent
Generelt Følg Microsofts retningslinjer
råd Design Guidelines for Developing Class Libraries
http://msdn.microsoft.com/en-us/library/vstudio/ms229042(v=vs.100).aspx
Framework Design Guidelines
http://books.google.no/books/about/Framework_Design_Guidelines.html?id
=39d1wZ598ecC&redir_esc=y

Antall kodelinjer er ikke indikatoren på hvor kompleks
løsningen er - det er leserens forståelse av koden som
Budskap indikerer hvor elegant løsningen er implementert

Når du lager kode som skal brukes av andre - invester i
brukervennlighet slik du ville ha gjort for en bruker som
sitter i brukergrensesnittet

I moderne web og mobile applikasjoner forventer brukerne å ha samme kontroll og oversikt som i tradisjonelle desktopapplikasjoner. Det skaper noen nye utfordringer for oss utviklere når front-end kjøres på en annen enhet en back-end som igjen typisk kjøres på en annen server en eksisterende kjernesystemer. I denne sesjonen viser Joar Øyen hvordan slike utfordringer er løst i en moderne web applikasjon fra Lindbak Retail Systems. Du får vite mer om Service Bus for Windows Server, Signal R og Windows Azure Notification Hubs og hvordan disse produktene er satt sammen for å holde brukere oppdatert i en asynkron verden.

Meldingsbasert integrasjonJoar Øyen

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Ett skritt ut i skyaJoar Øyen

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Fluent api design

1. Fluent API design Joar Øyen @joaroyen www.joaroyen.com

2. Innpakking av kompleks tredjeparts bibliotek Slike biblioteker har typisk funksjonalitet du ikke trenger Hvorfor? Veileder brukeren (dvs. utvikleren) hva som er semantisk gyldig i henhold til forretningsregler, og ikke bare hva som syntaktisk er mulig Lesbarhet

3. Alternativ til über-klasse som parameter Når? lang liste av overloads deklarativ konfigurasjon Biblioteker som i stor grad skal benyttes av andre For komplekse API som brukes sjelden (dvs. at kompleksiteten brukes sjelden)

4. Mikroskopisk domenespesifikt språk Hvordan? Builder pattern Det mest vanlige skal alltid resultere i enklest (minst) kode Ordenes rekkefølge er viktig Ett eller flere startpunkt Interface med tilhørende implementasjon Statisk wrapper Extension metoder

5. Log.Message( "Ingen tilgang til {0}. Verifiser at serveren er tilgjengelig.", FilePath); Eksempler Log.Message( 42, "Ingen tilgang til {0}. Verifiser at serveren er tilgjengelig.", FilePath); Log.Message(Resources.NoAccessToResource, FilePath); Log.Exception(new TimeoutException("Test"), "Message"); Log.UnhandledException(new TimeoutException("Message")); Log.Warning.Exception(new TimeoutException("Message")); Log.Information.To("Debug").Message("Message"); Debug.Message("Message");

6. Fra ett metodekall til 5 interfaces og 11 klasser Hva har vi Fra «über klasse» og «overloads from hell» til «train wreck» oppnådd? Syntaktisk sukker Log Message Error Exception Warning To Information UnhandledException Det mest vanlige blir veldig enkelt Veiviser for utviklere for avanserte scenarioer Lesbar og testbar kode

7. Vær konsistent Generelt Følg Microsofts retningslinjer råd Design Guidelines for Developing Class Libraries http://msdn.microsoft.com/en-us/library/vstudio/ms229042(v=vs.100).aspx Framework Design Guidelines http://books.google.no/books/about/Framework_Design_Guidelines.html?id =39d1wZ598ecC&redir_esc=y

8. Antall kodelinjer er ikke indikatoren på hvor kompleks løsningen er - det er leserens forståelse av koden som Budskap indikerer hvor elegant løsningen er implementert Når du lager kode som skal brukes av andre - invester i brukervennlighet slik du ville ha gjort for en bruker som sitter i brukergrensesnittet

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Fluent api design

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Fluent api design