Arif Akbarul HudaCoding | Writing | Sharing2013-now QISCUS

Twitter : @omayibMedium : www.medium.com/@omayib

“Repository Pattern for Mobile Applicaiton”

#Techtalk99

High quality software(ISO 9126-1 software quality model)

*Ignore the Portability factor

Maintainable

“Maintainability is impacted by code readability or complexity as well as modularization” ..

“Also the ability to verify (or test) a system, i.e. testability, is one of the subcharacteristics of maintainability. “

S.O.L.I.D.

● Single Responsibility● Open extention closed modificaiton● Liskov substitution principle● Interface Segregation● Dependency inversion

The real case

User can see the list of alumnus

On your activity @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_alumni_list);

// load the data directly from server OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder().url("http://10.0.2.2:3000/alumnus").build();

client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { e.printStackTrace(); }

@Override public void onResponse(Call call, Response response) throws IOException { } }); }

Over Request Worked!

I can put a Local Database

Public void onCreate(){ //… ArrayList<Person> alumnus = loadDataFromLocal(); if (alumnus.isEmpty()){ loadDataFromServer(); }}

private ArrayList<Person> loadDataFromLocal(){ RealmResults<PersonPersistance> personPersistances = realm.where(PersonPersistance.class).findAll(); ArrayList<Person> alumnus = new ArrayList<>(); for (int i = 0; i < personPersistances.size(); i++) { PersonPersistance item = personPersistances.get(i); alumnus.add(new Person(item.getId(),item.getName(),item.getEmail(),item.getJob())); } return alumnus; }

private void loadDataFromServer() { OkHttpClient client = new OkHttpClient(); Request request = new Request.Builder().url("http://10.0.2.2:3000/alumnus").build();

client.newCall(request).enqueue(new Callback() { @Override public void onFailure(Call call, IOException e) { e.printStackTrace(); }

@Override public void onResponse(Call call, Response response) throws IOException { } }); }

Managing data from local database

Managing data from local remote

Managing data from local cache

Managing view’s state

Managing activitie’s lifecycle

Breakfast with “spaghetti code”

Introducing a Repository Pattern

repositoryManager.loadAll()repositoryManager.save(..) RepositoryManager

CachedRepository

LocalRepository

RemoteRepository

Go to Android StudioGo to Swift Playground

https://github.com/omayib/SocialAlumni/tree/repository

https://github.com/omayib/SwiftRepositoryPattern