Safe vs Deep integration of Realm

Slides from my presentation on Realm at,

1. Mobile Era Oslo 2016, 3-Nov-2016
- http://mobileera.rocks/schedule/#session-102

2. Droidcon London 2016, 28-Oct-2016
- https://skillsmatter.com/conferences/7411-droidcon-london-2016#program

3. DevFest Hamburg 2016, 15-Oct-2016
- https://hamburg.devfest.de/speakers/7

4. Droidcon Vienna 2016, 16-Sep-2016
- https://droidcon.at/schedule/#session-118

Complete code for the sample used in the presentation
- https://github.com/viraj49/Realm_android-injection-rx-test

Detailed description on Realm
- https://medium.com/@Viraj.Tank/realm-integration-in-android-best-practices-449919d25f2f
- https://medium.com/@Viraj.Tank/deep-integration-of-realm-in-android-production-code-part-2-with-mvp-4cf44ab6289d
- https://android.jlelse.eu/realm-its-all-about-the-choices-we-make-7c2fe380ecd8

Transcript

1. Sociomantic Labs Dev Fest Hamburg 2016 #devfestHH Droidcon Vienna 2016 #droidconVie Viraj Tank @viraj49 Droidcon London 2016 #droidconUK Mobile Era Oslo 2016 #mobileEra
3. SQLite Realm Wrapper, ORM 2000, 2008 2008 - now 2014 DB History
4. Object store getA().getB() getA().getC()
5. Operation ORMLite Realm Init 92 ms 30 ms Write - 20k 1692 ms 1011 ms Read - 2k 2716 ms 410 ms Performance
6. AES-256 Performance Security
7. Performance Security Boilerplate code
8. Performance Security Boilerplate code Documentation
9. Performance Security Boilerplate code Documentation Learning Curve
10. Sample App
12. 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
13. Cross-platform
14. Realm + Android APK APK APK
15. 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();
16. /* 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
17. MVP (model view presenter ) Clean architecture Realm + RxJava Retrofit Dagger Butterknife Retrolambda Lombok
18. Code structure
19. View public class View extends Fragment { private Presenter mPresenter; }
20. 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)); } }
21. 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<List<GitHubUser>> fromCache() { return Observable.fromCallable(() -> mCache.getData()); } public class DataSource { private Cache mCache; private Dao mDao; private Retrofit mRetrofit; private Observable<List<GitHubUser>> fromCache() { return Observable.fromCallable(() -> mCache.getData()); } private Observable<List<GitHubUser>> fromRealm() { return Observalbe.fromCallable(() -> mDao.getData()); } public class DataSource { private Cache mCache; private Dao mDao; private Retrofit mRetrofit; private Observable<List<GitHubUser>> fromCache() { return Observable.fromCallable(() -> mCache.getData()); } private Observable<List<GitHubUser>> fromRealm() { return Observalbe.fromCallable(() -> mDao.getData()); } private Observable<List<GitHubUser>> fromRetrofit() { List<GitHubUser> gitHubUserList = mRetrofit.getData(); mDao.storeData(gitHubUserList); return Observable.just(gitHubUserList); } } Data Source
22. DAO public class Dao { Realm mRealm; public class Dao { Realm mRealm; public List<GitHubUser> getData() { public class Dao { Realm mRealm; public List<GitHubUser> getData() { return mRealm public class Dao { Realm mRealm; public List<GitHubUser> getData() { return mRealm.where(GitHubUser.class) public class Dao { Realm mRealm; public List<GitHubUser> getData() { return mRealm.where(GitHubUser.class).findAll(); } public class Dao { Realm mRealm; public List<GitHubUser> getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List<GitHubUser> gitHubUserList) { public class Dao { Realm mRealm; public List<GitHubUser> getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List<GitHubUser> gitHubUserList) { mRealm.executeTransaction(mRealm1 -> public class Dao { Realm mRealm; public List<GitHubUser> getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List<GitHubUser> gitHubUserList) { mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); }
23. “ Realm access from incorrect t hread. Realm objects can only b e accessed on the thread they w ere created.
24. “ I don't like you anymore.
26. DAO public class Dao { Realm mRealm; public List<GitHubUser> getData() { return mRealm.where(GitHubUser.class).findAll(); } public void storeData(List<GitHubUser> gitHubUserList) { mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); }
28. Thread safety Thread- 1 Thread- 2 read write/edit/delete
29. MVCC
30. Zero copy
31. 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
32. Safe integration
33. DAO public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List<GitHubUser> getData() { public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List<GitHubUser> getData() { Realm mRealm = Realm.getDefaultInstance(); public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List<GitHubUser> getData() { Realm mRealm = Realm.getDefaultInstance(); List<GitHubUser> gitHubUserList = mRealm.where(GitHubUser.class) .findAll()); public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List<GitHubUser> getData() { Realm mRealm = Realm.getDefaultInstance(); List<GitHubUser> gitHubUserList = mRealm.copyFromRealm( mRealm.where(GitHubUser.class) .findAll()); public class Dao { public void storeData(List<GitHubUser> gitHubUserList) { Realm mRealm = Realm.getDefaultInstance(); mRealm.executeTransaction(mRealm1 -> mRealm1.insertOrUpdate(gitHubUserList)); mRealm.close(); } public List<GitHubUser> getData() { Realm mRealm = Realm.getDefaultInstance(); List<GitHubUser> gitHubUserList = mRealm.copyFromRealm( mRealm.where(GitHubUser.class) .findAll()); mRealm.close(); return gitHubUserList; } }
34. Release time
36. Drawing Board “ EventBus “ RxJava
37. Auto update 1 2 read write/edit/delete change
38. Deep integration
39. 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(); } }
40. 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
41. Rule of Thumb
43. Thanks github.com/viraj49 twitter.com/viraj49