Sociomantic Labs Dev Fest Hamburg 2016 #devfestHH Droidcon Vienna 2016 #droidconVie Viraj Tank @viraj49 Droidcon London 2016 #droidconUK Mobile Era Oslo 2016 #mobileEra 

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SQLite Realm Wrapper, ORM 2000, 2008 2008 - now 2014 DB History 

Object store getA().getB() getA().getC() 

Operation ORMLite Realm Init 92 ms 30 ms Write - 20k 1692 ms 1011 ms Read - 2k 2716 ms 410 ms Performance 

AES-256 Performance Security 

Performance Security Boilerplate code 

Performance Security Boilerplate code Documentation 

Performance Security Boilerplate code Documentation Learning Curve 

Sample App 

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Download /* Project level build.gradle file */ classpath "io.realm:realm-gradle-plugin:2.1.1" /* Application level build.gradle file */ apply plugin: 'realm-android' ~1750 method counts ~800 kilobytes 

Cross-platform 

Realm + Android APK APK APK 

Init & Config Realm.init(this); RealmConfiguration config = new RealmConfiguration .Builder() .build(); Realm.init(this); RealmConfiguration config = new RealmConfiguration .Builder() .name("gitHubDB") .build(); Realm.init(this); RealmConfiguration config = new RealmConfiguration .Builder() .name("gitHubDB") .encryptionKey(key) .build(); Realm.init(this); RealmConfiguration config = new RealmConfiguration .Builder() .name("gitHubDB") .encryptionKey(key) .deleteRealmIfMigrationNeeded() .build(); Realm.init(this); RealmConfiguration config = new RealmConfiguration .Builder() .name("gitHubDB") .encryptionKey(key) .deleteRealmIfMigrationNeeded() .build(); Realm.setDefaultConfiguration(config); Realm realm = Realm.getDefaultInstance(); 

/* used for all (realm + json + view) */ @Getter public class GitHubUser { private String login; private int id; private String avatar_url; } /* used for all (realm + json + view) */ @Getter public class GitHubUser extends RealmObject { private String login; private int id; private String avatar_url; } /* used for all (realm + json + view) */ @Getter public class GitHubUser extends RealmObject { @PrimaryKey private String login; private int id; private String avatar_url; } Model 

MVP (model view presenter ) Clean architecture Realm + RxJava Retrofit Dagger Butterknife Retrolambda Lombok 

Code structure 

View public class View extends Fragment { private Presenter mPresenter; } 

Presenter public class Presenter { private View mView; public class Presenter { private View mView; private DataSource mDataSource; public class Presenter { private View mView; private DataSource mDataSource; public void loadData() { mDataSource .getData() public class Presenter { private View mView; private DataSource mDataSource; public void loadData() { mDataSource .getData() .subscribeOn(computationThread()) public class Presenter { private View mView; private DataSource mDataSource; public void loadData() { mDataSource .getData() .subscribeOn(computationThread()) .observeOn(mainThread()) public class Presenter { private View mView; private DataSource mDataSource; public void loadData() { mDataSource .getData() .subscribeOn(computationThread()) .observeOn(mainThread()) .subscribe(mData -> mView.setData(mData)); } } 

public class DataSource { private Cache mCache; private Dao mDao; private Retrofit mRetrofit; public class DataSource { private Cache mCache; private Dao mDao; private Retrofit mRetrofit; private Observable> fromCache() { return Observable.fromCallable(() -> mCache.getData()); } public class DataSource { private Cache mCache; private Dao mDao; private Retrofit mRetrofit; private Observable> fromCache() { return Observable.fromCallable(() -> mCache.getData()); } private Observable> fromRealm() { return Observalbe.fromCallable(() -> mDao.getData()); } public class DataSource { private Cache mCache; private Dao mDao; private Retrofit mRetrofit; private Observable> fromCache() { return Observable.fromCallable(() -> mCache.getData()); } private Observable> fromRealm() { return Observalbe.fromCallable(() -> mDao.getData()); } private Observable> fromRetrofit() { List gitHubUserList = mRetrofit.getData(); mDao.storeData(gitHubUserList); return Observable.just(gitHubUserList); } } Data Source 

DAO public class Dao { Realm mRealm; public class Dao { Realm mRealm; public List getData() { public class Dao { Realm mRealm; public List getData() { return mRealm public class Dao { Realm mRealm; public List getData() { return mRealm.where(GitHubUser.class) public class Dao { Realm mRealm; public List getData() { return mRealm.where(GitHubUser.class).findAll(); } public class Dao { Realm mRealm; public List getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List gitHubUserList) { public class Dao { Realm mRealm; public List getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List gitHubUserList) { mRealm.executeTransaction(mRealm1 -> public class Dao { Realm mRealm; public List getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List gitHubUserList) { mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); } 

“ Realm access from incorrect t hread. Realm objects can only b e accessed on the thread they w ere created. 

“ I don't like you anymore. 

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DAO public class Dao { Realm mRealm; public List getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List gitHubUserList) { mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); } 

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Thread safety Thread- 1 Thread- 2 read write/edit/delete 

MVCC 

Zero copy 

Drawing Board 1. Don't inject Realm 2. Don't pass RealmResults across threads “ Make an in memory copy of results and pass it to Presenter. - Safe integration “ Query the data in Presenter itself on main thread. - Deep integration 

Safe integration 

DAO public class Dao { public void storeData(List gitHubUserList) { public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List getData() { public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List getData() { Realm mRealm = Realm.getDefaultInstance(); public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List getData() { Realm mRealm = Realm.getDefaultInstance(); List gitHubUserList = mRealm.where(GitHubUser.class) .findAll()); public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List getData() { Realm mRealm = Realm.getDefaultInstance(); List gitHubUserList = mRealm.copyFromRealm( mRealm.where(GitHubUser.class) .findAll()); public class Dao { public void storeData(List gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List getData() { Realm mRealm = Realm.getDefaultInstance(); List gitHubUserList = mRealm.copyFromRealm( mRealm.where(GitHubUser.class) .findAll()); mRealm.close(); return gitHubUserList; } } 

Release time 

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Drawing Board “ EventBus “ RxJava 

Auto update 1 2 read write/edit/delete change 

Deep integration 

public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() .asObservable() public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() .asObservable() .filter(RealmResults::isLoaded) .filter(RealmResults::isValid) public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() .asObservable() .filter(RealmResults::isLoaded) .filter(RealmResults::isValid) .filter(realmResults -> realmResults.size() > 0) .subscribe(gitHubUsers -> mView.setData(gitHubUsers)); } public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() .asObservable() .filter(RealmResults::isLoaded) .filter(RealmResults::isValid) .filter(realmResults -> realmResults.size() > 0) .subscribe(gitHubUsers -> mView.setData(gitHubUsers)); } public void loadData() { mDataSource .getData() .subscribeOn(getComputationThread()) .observeOn(getMainThread()) public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() .asObservable() .filter(RealmResults::isLoaded) .filter(RealmResults::isValid) .filter(realmResults -> realmResults.size() > 0) .subscribe(gitHubUsers -> mView.setData(gitHubUsers)); } public void loadData() { mDataSource .getData() .subscribeOn(getComputationThread()) .observeOn(getMainThread()) .subscribe(statusValue -> statusValue); } public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() .asObservable() .filter(RealmResults::isLoaded) .filter(RealmResults::isValid) .filter(realmResults -> realmResults.size() > 0) .subscribe(gitHubUsers -> mView.setData(gitHubUsers)); } public void loadData() { mDataSource .getData() .subscribeOn(getComputationThread()) .observeOn(getMainThread()) .subscribe(statusValue -> statusValue); } public void unSubscribe() { public class Presenter { private View mView; private Realm mRealm; private DataSource mDataSource; public void bind() { mRealm = Realm.getDefaultInstance(); mRealm.where(GitHubUser.class) .findAllAsync() .asObservable() .filter(RealmResults::isLoaded) .filter(RealmResults::isValid) .filter(realmResults -> realmResults.size() > 0) .subscribe(gitHubUsers -> mView.setData(gitHubUsers)); } public void loadData() { mDataSource .getData() .subscribeOn(getComputationThread()) .observeOn(getMainThread()) .subscribe(statusValue -> statusValue); } public void unSubscribe() { mRealm.removeAllChangeListeners(); mRealm.close(); } } 

Safe 1. Easy 2. Realm on comp-thread 3. Pluggable module 4. Easy to test & debug 5. Minimal structure change 6. Minimal refactoring 7. Clean Architechture Deep 1. Auto update feature 2. Faster queries 3. Less memory utilization Integration 

Rule of Thumb 

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Thanks github.com/viraj49 twitter.com/viraj49