The State of Managing State with RxJava (Devoxx US 2017)

RxJava's use in building Android apps has grown rapidly! Combining and composing synchronous and asynchronous sources of data has become easy. That burden that remains is where to put the overall state of the application and how to handle its changes. This talk will be an exploration in how we can increase the confidence and determinism of our app state.

Because Rx isn't specific to Android, we'll look at state management approaches employed by other platforms and languages and whether or not they're appropriate to use. We will also look at how state management fits into application architectures such as MVP and MVVM.

Attendees of this talk should already be comfortable with reactive programming and RxJava's APIs.

Video: https://youtu.be/0IKHxjkgop4

Transcript

1. Managing State with RxJava Jake Wharton
2. Why Reactive? Unless you can model your entire system synchronously...
3. Why Reactive? Unless you can model your entire system synchronously, a single asynchronous source breaks imperative programming.
4. Why Reactive? interface UserManager { User getUser();
 }A
5. Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A
6. Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager();
7. Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser());
8. Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe");
9. Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe"); System.out.println(um.getUser());
10. Why Reactive? interface UserManager { User getUser(); void setName(String name); // <-- now async void setAge(int age); // <-- now async
 }A
11. Why Reactive? interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe"); System.out.println(um.getUser());
12. Why Reactive? interface UserManager { User getUser(); void setName(String name, Runnable callback); void setAge(int age, Runnable callback);
 }A
13. Why Reactive? interface UserManager { User getUser(); void setName(String name, Runnable callback);A void setAge(int age, Runnable callback);B
 }A UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", () -> { System.out.println(um.getUser()); });
14. Why Reactive? interface UserManager { User getUser(); void setName(String name, Listener listener);A void setAge(int age, Listener listener);B interface Listener { void success(User user); void failure(IOException e); }G
 }A
15. Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe");
16. Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }A @Override public void failure(IOException e) { // TODO show the error... }B });
17. Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }A @Override public void failure(IOException e) { // TODO show the error... }B }); um.setAge(40, new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }C 2@Override public void failure(IOException e) {2 2// TODO show the error...2 }D });2
18. Why Reactive? UserManager um = new UserManager(); System.out.println(um.getUser()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); um.setAge(40, new UserManager.Listener() { @Override public void success() { System.out.println(um.getUser()); }C 2@Override public void failure(IOException e) {2 2// TODO show the error...2 }D });2 }A @Override public void failure(IOException e) { // TODO show the error... }B });
19. Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { tv.setText(um.getUser().toString()); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z
20. Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { tv.setText(um.getUser().toString()); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z
21. Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { if (isDestroyed()) { tv.setText(um.getUser().toString()); } }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z
22. Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { if (isDestroyed()) { tv.setText(um.getUser().toString()); } }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z
23. Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { if (isDestroyed()) { tv.setText(um.getUser().toString()); }L }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z
24. Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { runOnUiThread(new Runnable() { @Override public void run() { if (isDestroyed()) { tv.setText(um.getUser().toString()); }L }4 }); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z
25. Why Reactive? public final class UserActivity extends Activity { private final UserManager um = new UserManager(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.user); TextView tv = (TextView) findViewById(R.id.user_name); tv.setText(um.getUser().toString()); um.setName("Jane Doe", new UserManager.Listener() { @Override public void success() { runOnUiThread(new Runnable() { @Override public void run() { if (isDestroyed()) { tv.setText(um.getUser().toString()); } }4 }); }A @Override public void failure(IOException e) { // TODO show the error... }B }); }Y }Z
26. Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick
27. Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick
28. Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick
29. Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick
30. Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick
31. Why Reactive? GET / 200 OK SELECT * Jane Doe setText onClick SELECT * Jane Doe setText UPDATE user Jane Doe setText
32. Why Reactive?
33. Why Reactive? Unless you can model your entire system synchronously, a single asynchronous source breaks imperative programming.
34. Why Reactive?
35. Why Reactive?
36. Why Reactive?
37. Why Reactive?
38. Why Reactive?
39. Why Reactive?
40. interface UserManager { User getUser(); void setName(String name); void setAge(int age);
 }A Being Reactive
41. Being Reactive interface UserManager { Observable<User> getUser(); void setName(String name); void setAge(int age);
 }A
42. Being Reactive interface UserManager { Observable<User> getUser(); Completable setName(String name); Completable setAge(int age);
 }A void void

43. Being Reactive um.getUser()
44. Being Reactive um.getUser() .observeOn(AndroidSchedulers.mainThread())
45. Being Reactive um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } });
46. Being Reactive um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } });2
47. Being Reactive disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } }));2
48. Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose();
49. Being Reactive um.setName("Jane Doe")
50. Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io())
51. Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread())
52. Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { }1 @Override public void onError(Throwable t) { // retry or show }2 });
53. Being Reactive um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 });3
54. Being Reactive disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3
55. Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3
56. Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates
57. Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading
58. Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading Easy error-handling
59. Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading Easy error-handling Specialized callbacks
60. Being Reactive // onCreate disposables.add(um.getUser() .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableObserver<User>() { @Override public void onNext(User user) { tv.setText(user.toString()); }1 @Override public void onComplete() { /* ignored */ } @Override public void onError(Throwable t) { /* crash or show */ } })); // onDestroy disposables.dispose(); // button click listener disposables.add(um.setName("Jane Doe") .subscribeOn(Schedulers.io()) .observeOn(AndroidSchedulers.mainThread()) .subscribeWith(new DisposableCompletableObserver() { @Override public void onComplete() { // success! re-enable editing }1 @Override public void onError(Throwable t) { // retry or show }2 }));3 Push-based updates Declarative threading Easy error-handling Specialized callbacks Lifecycle cancelation
61. Managing State Enter name: SUBMIT
62. Managing State Enter name: SUBMIT Jane Doe
63. Managing State Enter name: SUBMIT Jane Doe
64. Managing State Enter name: SUBMIT
65. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
66. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
67. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
68. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
69. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
70. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
71. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
72. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
73. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
74. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
75. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
76. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
77. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
78. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
79. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
80. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
81. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
82. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
83. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
84. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
85. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
86. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
87. Managing State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
88. Managing State
89. Managing State RxView.clicks(…)
90. Managing State doOnNext(…)
91. Managing State getText()
92. Managing State flatMap(…)
93. Managing State flatMap(…)
94. Managing State doOnNext(…)
95. Managing State subscribe(…)
96. Managing State
97. Managing State
98. Managing State
99. Managing State RxView.clicks(…)
100. Managing State doOnNext(…)
101. Managing State doOnNext(…) doOnNext(…)
102. Managing State doOnNext(…) doOnNext(…)
103. Managing State getText()
104. Managing State flatMap(…)
105. Managing State doOnNext(…)
106. Managing State subscribe(…)
107. Managing State
108. Managing State
109. Managing State
110. Managing State RxView.clicks(…) getText()
111. Managing State RxView.clicks(…) getText() Observable<SubmitEvent>
112. Managing State doOnNext(…) doOnNext(…) subscribe(…)
113. Managing State doOnNext(…) doOnNext(…) doOnNext(…)
114. Managing State doOnNext(…) doOnNext(…) doOnNext(…)
115. Managing State doOnNext(…) doOnNext(…) subscribe(…)
116. Managing State doOnNext(…) doOnNext(…) subscribe(…)
117. Managing State subscribe(ignored -> …)
118. Managing State subscribe((SubmitUiModel model) -> …) ignored
119. Managing State
120. Managing State
121. Reactive State
122. Reactive State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString())) .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
123. Reactive State disposables.add(RxView.clicks(submitView) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(ignored -> service.setName(nameView.getText().toString()))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
124. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> nameView.getText().toString())Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(name -> service.setName(name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
125. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); })); name
126. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
127. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
128. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString()))Y .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
129. Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }
130. Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }
131. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
132. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .doOnNext(ignored -> { submitView.setEnabled(false); progressView.setVisibility(VISIBLE); }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
133. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .doOnNext(ignored -> { SubmitUiModel.inProgress() }) .flatMap(event -> service.setName(event.name))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); })); .startWith( submitView.setEnabled(false); progressView.setVisibility(VISIBLE);
134. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .startWith(SubmitUiModel.inProgress()))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
135. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .startWith(SubmitUiModel.inProgress()))X .observeOn(AndroidSchedulers.mainThread()) .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
136. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
137. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
138. Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }
139. Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }
140. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .doOnNext(ignored -> progressView.setVisibility(GONE)) .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); }));
141. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> { submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + t.getMessage(), LENGTH_SHORT).show(); })); progressView.setVisibility(GONE) .doOnNext(ignored -> )
142. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> {})); submitView.setEnabled(true); Toast.makeText(this, "Failed to set name: " + , LENGTH_SHORT).show();
143. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> {}));
144. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(s -> finish(), t -> {}));
145. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); } }, t -> {})); s
146. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> {}));
147. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()))X .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
148. Reactive State disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())) .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
149. Reactive State Observable<SubmitEvent> events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); disposables.add(events.flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
150. Reactive State Observable<SubmitEvent> events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable<SubmitUiModel> models = events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(models.subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
151. Reactive State Observable<SubmitEvent> events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); models models
152. Reactive State Observable<SubmitEvent> events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
153. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); .compose(submit) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.errorMessage, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
154. Reactive State
155. Reactive State
156. Reactive State
157. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); .compose(submit) .subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
158. Reactive State Observable<SubmitEvent> events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
159. Reactive State Observable<SubmitEvent> events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
160. Reactive State class SubmitEventZ{ /* ... */ } Observable<SubmitEvent> events = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage()) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
161. Reactive State abstract class SubmitUiEvent {} class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable<SubmitEvent> submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); e
162. Reactive State abstract class SubmitUiEvent {} class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable<SubmitEvent> submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable<CheckNameEvent> checkNameEvents = RxTextView.afterTextChanges(nameView) .map(text -> new CheckNameEvent(text));
163. Reactive State abstract class SubmitUiEvent {} class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable<SubmitEvent> submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable<CheckNameEvent> checkNameEvents = RxTextView.afterTextChanges(nameView) .map(text -> new CheckNameEvent(text)); Observable<SubmitUiEvent> events = Observable.merge(submitEvents, checkNameEvents);
164. Reactive State Observable<SubmitUiEvent> events = /* ... */; ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); abstract class SubmitUiEvent {} O b s e r v a b l e . m e r g e ( s u b m i t E v e n t s , c h e c k N a m e E v e n t s ) class SubmitEventZextends SubmitUiEventY{ /* ... */ } class CheckNameEvent extends SubmitUiEvent { /* ... */ } Observable<SubmitEvent> submitEvents = RxView.clicks(submitView) .map(ignored -> new SubmitEvent(nameView.getText().toString())); Observable<CheckNameEvent> checkNameEvents = RxTextView.afterTextChanges(nameView) .map(text -> new CheckNameEvent(text));
165. Reactive State Observable<SubmitUiEvent> events = /* ... */; ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); disposables.add(events.compose(submit).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
166. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress()));
167. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));
168. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));
169. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));
170. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events .flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = events -> events .switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));
171. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */;
172. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> ???;
173. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> ???; events
174. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> ???; events checkName submit
175. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> ???; events models checkName submit
176. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> ???; events models checkName submit Observable.merge(…)
177. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> ???; events models checkName submit Observable.merge(…) Observable.publish(…);
178. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> ???; Observable.merge(…) Observable.publish(…);
179. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> events.publish(shared -> Observable.merge( );Z …) Observable …ZG
180. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName)));
181. Reactive State Observable<SubmitUiEvent> events = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName))); disposables.add(events.compose(submitUi).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */;
182. Reactive State Observable<SubmitUiEvent> events = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName))); disposables.add(events.compose(submitUi).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); }));
183. Reactive State Observable<SubmitUiEvent> events = /* ... */; ObservableTransformer<SubmitUiEvent, SubmitUiModel> submitUi = events -> events.publish(shared -> Observable.merge( shared.ofType(SubmitEvent.class).compose(submit), shared.ofType(CheckNameEvent.class).compose(checkName))); disposables.add(events.compose(submitUi).subscribe(model -> { submitView.setEnabled(!model.inProgress); progressView.setVisibility(model.inProgress ? VISIBLE : GONE); if (!model.inProgress) { if (model.success) finish() else Toast.makeText(this, "Failed to set name: " + model.message, LENGTH_SHORT).show(); }X }, t -> { throw new OnErrorNotImplementedException(t); })); ObservableTransformer<SubmitEvent, SubmitUiModel> submit = /* ... */; ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = /* ... */;
184. Reactive State
185. Reactive State
186. Reactive State Observable<UiEvent>
187. Reactive State Observable<UiEvent> Observable<UiModel>
188. Reactive State Observable<UiEvent> Observable<UiModel> Observable<UiEvent>
189. Reactive State Observable<UiEvent> Observable<UiModel> Observable<UiEvent> Observable<UiModel>
190. Reactive State Observable<UiEvent> Observable<UiModel> Observable<Action> Observable<UiModel> UiEventZ
191. Reactive State Observable<UiEvent> Observable<UiModel> Observable<Action> Observable<Result> UiModelZ
192. Reactive State Observable<UiEvent> Observable<UiModel> Observable<Action> Observable<Result>
193. Reactive State Observable<UiEvent> Observable<UiModel> Observable<Action> Observable<Result>
194. Reactive State Observable<UiEvent> Observable<UiModel> Observable<Action> Observable<Result>
195. Reactive State final class SubmitUiModel { final boolean inProgress; final boolean success; final String errorMessage; private SubmitUiModel( boolean inProgress, boolean success, String errorMessage) { // ... } static SubmitUiModel inProgress() { /* ... */ } static SubmitUiModel success() { /* ... */ } static SubmitUiModel failure(String errorMessage) { /* ... */ } }
196. Reactive State inProgress false success false errorMessage null
197. Reactive State inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT
198. Reactive State inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null CheckNameResult.SUCC
199. Reactive State rogress se cess se orMessage l CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null CheckNameResult.SUCCESS i f s f e n
200. Reactive State ckNameResult.IN_FLIGHT inProgress true success false errorMessage null CheckNameResult.SUCCESS inProgress false success false errorMessage null Ch
201. Reactive State rogress e cess se orMessage l CheckNameResult.SUCCESS inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT i t s f e n
202. Reactive State ckNameResult.SUCCESS inProgress false success false errorMessage null CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null Su
203. Reactive State nProgress alse uccess alse rrorMessage ull CheckNameResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.IN_FLIGHT i t s f e n
204. Reactive State eckNameResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.IN_FLIGHT inProgress true success false errorMessage null Su
205. Reactive State T inProgress true success false errorMessage null SubmitResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.SUCCESS i f s t e n
206. Reactive State SubmitResult.IN_FLIGHT inProgress true success false errorMessage null SubmitResult.SUCCESS inProgress false success true errorMessage null
207. Reactive State SubmitUiModel initialState = SubmitUiModel.idle();
208. Reactive State SubmitUiModel initialState = SubmitUiModel.idle(); Observable<Result> results = /* ... */;
209. Reactive State SubmitUiModel initialState = SubmitUiModel.idle(); Observable<Result> results = /* ... */; Observable<SubmitUiModel> uiModels = results .scan(initialState, (state, result) -> /* ... */);
210. Reactive State SubmitUiModel initialState = SubmitUiModel.idle(); Observable<Result> results = /* ... */; Observable<SubmitUiModel> uiModels = results .scan(initialState, (state, result) -> { if (result == CheckNameResult.IN_FLIGHT || result == SubmitResult.IN_FLIGHT) return SubmitUiModel.inProgress(); if (result == CheckNameResult.SUCCESS) return SubmitUiModel.idle(); if (result == SubmitResult.SUCCESS) return SubmitUiModel.success(); // TODO handle check name and submit failures... throw new IllegalArgumentException("Unknown result: " + result); }); /* ... */
211. Reactive State ObservableTransformer<SubmitEvent, SubmitUiModel> submit = events -> events.flatMap(event -> service.setName(event.name) .map(response -> SubmitUiModel.success()) .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage())) .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer<CheckNameEvent, SubmitUiModel> checkName = events -> events.switchMap(event -> event .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(event -> service.checkName(event.name)) .map(response -> ???) .onErrorReturn(t -> ???) .observeOn(AndroidSchedulers.mainThread()) .startWith(???));
212. Reactive State ObservableTransformer<SubmitAction, SubmitUiModel> submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitUiModel.success())A .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer<CheckNameAction, SubmitUiModel> checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> ???)Y .onErrorReturn(t -> ???)Z .observeOn(AndroidSchedulers.mainThread()) .startWith(???)); SubmitEvent SubmitUiModel events events event event CheckNameEvent SubmitUiModel events events event event event event
213. Reactive State ObservableTransformer<SubmitAction, SubmitUiModel> submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitUiModel.success())A .onErrorReturn(t -> SubmitUiModel.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitUiModel.inProgress())); ObservableTransformer<CheckNameAction, SubmitUiModel> checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> ???)Y .onErrorReturn(t -> ???)Z .observeOn(AndroidSchedulers.mainThread()) .startWith(???));
214. Reactive State ObservableTransformer<SubmitAction, SubmitResult> submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitResult.SUCCESS)A .onErrorReturn(t -> SubmitResult.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitResult.IN_FLIGHT)); ObservableTransformer<CheckNameAction, CheckNameResult> checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> CheckNameResult.SUCCESS)Y .onErrorReturn(t -> CheckNameResult.failure(t.getMessage()))Z .observeOn(AndroidSchedulers.mainThread()) .startWith(CheckNameResult.IN_FLIGHT)); SubmitUiModel.success() SubmitUiModel.failure(t.getMessage()) SubmitUiModel.inProgress() ??? ??? ???
215. Reactive State ObservableTransformer<SubmitAction, SubmitResult> submit = actions -> actions.flatMap(action -> service.setName(action.name) .map(response -> SubmitResult.SUCCESS)A .onErrorReturn(t -> SubmitResult.failure(t.getMessage()))B .observeOn(AndroidSchedulers.mainThread()) .startWith(SubmitResult.IN_FLIGHT)); ObservableTransformer<CheckNameAction, CheckNameResult> checkName = actions -> actions.switchMap(action -> action .delay(200, MILLISECONDS, AndroidSchedulers.mainThread()) .flatMap(action -> service.checkName(action.name)) .map(response -> CheckNameResult.SUCCESS)Y .onErrorReturn(t -> CheckNameResult.failure(t.getMessage()))Z .observeOn(AndroidSchedulers.mainThread()) .startWith(CheckNameResult.IN_FLIGHT));
217. Observable<UiEvent>
218. Observable<UiEvent> Observable<Action>
219. Observable<UiEvent> Observable<Action> Observable<Result>
220. Observable<UiEvent> Observable<Action> Observable<Result> Observable<UiModel>
221. Observable<UiEvent> Observable<Action> Observable<Result> Observable<UiModel> Log.d
222. Observable<UiEvent> Observable<Action> Observable<Result> Observable<UiModel> Log.d
223. Observable<UiEvent> Observable<Action> Observable<Result> Observable<UiModel> Subject<UiEvent> TestObserver<UiModel>
224. Observable<UiEvent> Observable<Action> Observable<Result> Observable<UiModel>
225. Observable<UiEvent> Observable<UiModel> TestObserver<UiEvent> Subject<UiModel>
226. Observable<UiEvent> Observable<Action> Observable<Result> Observable<UiModel>
227. Observable<UiEvent> Observable<Action> Observable<Result> Observable<UiModel> Redux / Cycle
228. jakewharton jakewharton jakewharton twitter.com/ github.com/ .com Managing State with RxJava