Watcher - EventBus Reinvented

一个更加简洁的观察者模式的实现，基于 RxJava 的 Subject，旨在解决现有 EventBus 难于在大规模代码的维护问题。

Transcript

1. Watcher EventBus Reinvented ayangxu
2. EventBus ฎՋԍ • ݎ૲-ᦈᴅཛྷࣳҁPublish - Subscribe҂ • guava/EventBus • greenrobot/EventBus • square/otto • moai/Watcher
3. // Class is typically registered by the container. class EventBusChangeRecorder { @Subscribe public void recordCustomerChange(ChangeEvent e) { recordChange(e.getChange()); } } // somewhere during initialisation eventBus.register(new EventBusChangeRecorder()); // much later public void changeCustomer() { ChangeEvent event = getChangeEvent(); eventBus.post(event); } guava/EventBus
4. // Class is typically registered by the container. class EventBusChangeRecorder { @Subscribe public void recordCustomerChange(ChangeEvent e) { recordChange(e.getChange()); } } // somewhere during initialisation eventBus.register(new EventBusChangeRecorder()); // much later public void changeCustomer() { ChangeEvent event = getChangeEvent(); eventBus.post(event); } guava/EventBus // Class is typically registered by the container. class EventBusChangeRecorder { @Subscribe public void recordCustomerChange(ChangeEvent e) { recordChange(e.getChange()); } } // somewhere during initialisation eventBus.register(new EventBusChangeRecorder()); // much later public void changeCustomer() { ChangeEvent event = getChangeEvent(); eventBus.post(event); }
5. // Define events: public class MessageEvent { /* Additional fields if needed */ } // Prepare subscribers: eventBus.register(this); public void onEvent(AnyEventType event) { /* Do something */ }; // Post events: eventBus.post(event); greenrobot/EventBus
6. // Define events: public class MessageEvent { /* Additional fields if needed */ } // Prepare subscribers: eventBus.register(this); public void onEvent(AnyEventType event) { /* Do something */ }; // Post events: eventBus.post(event); greenrobot/EventBus // Define events: public class MessageEvent { /* Additional fields if needed */ } // Prepare subscribers: eventBus.register(this); public void onEvent(AnyEventType event) { /* Do something */ }; // Post events: eventBus.post(event);
7. Bus bus = new Bus(); bus.post(new AnswerAvailableEvent(42)); @Subscribe public void answerAvailable(AnswerAvailableEvent event) { // TODO: React to the event somehow! } bus.register(this); @Produce public AnswerAvailableEvent produceAnswer() { // Assuming 'lastAnswer' exists. return new AnswerAvailableEvent(this.lastAnswer); } square/otto
8. Bus bus = new Bus(); bus.post(new AnswerAvailableEvent(42)); @Subscribe public void answerAvailable(AnswerAvailableEvent event) { // TODO: React to the event somehow! } bus.register(this); @Produce public AnswerAvailableEvent produceAnswer() { // Assuming 'lastAnswer' exists. return new AnswerAvailableEvent(this.lastAnswer); } square/otto Bus bus = new Bus(); bus.post(new AnswerAvailableEvent(42)); @Subscribe public void answerAvailable(AnswerAvailableEvent event) { // TODO: React to the event somehow! } bus.register(this); @Produce public AnswerAvailableEvent produceAnswer() { // Assuming 'lastAnswer' exists. return new AnswerAvailableEvent(this.lastAnswer); }
9. // Define an Event public interface PushWatcher extents Watchers.Watcher { void notify(Message message); } // Publishing an Event Watchers.of(PushWatcher.class).notify(message); // Subscribing to an Event public class MyFragment extends Fragment implement PushWatcher { public void notify(Message message) { } public void onStart() { Watchers.bind(this); } } Watcher
10. // Define an Event public interface PushWatcher extents Watchers.Watcher { void notify(Message message); } // Publishing an Event Watchers.of(PushWatcher.class).notify(message); // Subscribing to an Event public class MyFragment extends Fragment implement PushWatcher { public void notify(Message message) { } public void onStart() { Watchers.bind(this); } } Watcher // Define an Event public interface PushWatcher extents Watchers.Watcher { void notify(Message message); } // Publishing an Event Watchers.of(PushWatcher.class).notify(message); // Subscribing to an Event public class MyFragment extends Fragment implement PushWatcher { public void notify(Message message) { } public void onStart() { Watchers.bind(this); } }
11. guava EventBus greenrobot EventBus sqaure otto moai Watcher ᕚᑕਞق ✓ ✓ ✓ ✓ ٖਂਞق ✓ ✓ ✗ ҁಋۖᥴᕬ҂ ✓ ᔄࣳਞق ✗ ✗ ✗ ✓ դᎱᰁҁဳ᯽҂ 322ᤈ ׁᩢ Guava ෫ ෫ RxJava/Guava Ԫկ݇හ੗ᤰ ᵱᥝ ᵱᥝ ᵱᥝ ӧᵱᥝ ັತݎ૲/ᦈᴅ ✗ ✗ ✗ ✓ Ԫկ٫ᑱ ✗ ✗ ✗ ✓ Ԫկᖀಥ ✓ ✗ ✓ ✓ ᯿຅ඪ೮ ✗ ✗ ✗ ✓ ग़ොᦈᴅ ✓ ✗ ✓ ✓ ᕚᑕᯈᗝ ොဩᕆ ොဩᕆ Bus & ොဩᕆ ᔄᕆ ളත෯ၾ௳ ✗ ✗ ✗ ✓ ࢧ᧣᷇ሲᴴګ ✗ ✗ ✗ ✓
12. ਫሿᕡᜓ
13. Watchers.of(PushWatcher.class).notify(message); ᧣አ঩ಓ
14. Watchers.of(PushWatcher.class).notify(message); ᧣አ঩ಓ Watchers.of(PushWatcher.class).notify(message);
15. ᧣አ঩ಓ Watchers.of(PushWatcher.class).notify(message); EventBus
16. ᧣አ঩ಓ Watchers.of(PushWatcher.class).notify(message); EventBus Ԫկᔄڦ
17. ᧣አ঩ಓ Watchers.of(PushWatcher.class).notify(message); EventBus Ԫկᔄڦ Ԫկ֢ۖ
18. ᧣አ঩ಓ Watchers.of(PushWatcher.class).notify(message); EventBus Ԫկᔄڦ Ԫկ֢ۖ ֢ۖӤӥ෈
19. Proxy.newProxyInstance( clazz.getClassLoader(), new Class[] { clazz }, new WatcherHandler(clazz) ) ᧣አ঩ಓ
20. Proxy.newProxyInstance( clazz.getClassLoader(), new Class[] { clazz }, new WatcherHandler(clazz) ) ᧣አ঩ಓ Proxy.newProxyInstance( clazz.getClassLoader(), new Class[] { clazz }, new WatcherHandler(clazz) )
21. WatcherHandler static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 }
22. WatcherHandler static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } EventBus
23. WatcherHandler static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } EventBus Ԫկᔄڦ
24. WatcherHandler static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } EventBus Ԫկᔄڦ Ԫկ֢ۖ
25. WatcherHandler static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } static class WatcherHandler implements InvocationHandler {
 private final Class<? extends Watcher> clazz;
 WatcherHandler(Class<? extends Watcher> clazz) {
 this.clazz = clazz;
 }
 
 @Override
 public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
 if (method.getDeclaringClass() == Object.class) {
 return method.invoke(this, args);
 }
 instance.trigger(clazz, method, args);
 return null;
 }
 } EventBus Ԫկᔄڦ Ԫկ֢ۖ ֢ۖӤӥ෈
26. // Define an Event public interface PushWatcher extents Watchers.Watcher { void notify(Message message); } // Publishing an Event Watchers.of(PushWatcher.class).notify(message); // Subscribing to an Event public class MyFragment extends Fragment implement PushWatcher { public void notify(Message message) { } public void onStart() { Watchers.bind(this); } } ᔄࣳਞق & ᯿຅
27. // Define an Event public interface PushWatcher extents Watchers.Watcher { void notify(Message message); } // Publishing an Event Watchers.of(PushWatcher.class).notify(message); // Subscribing to an Event public class MyFragment extends Fragment implement PushWatcher { public void notify(Message message) { } public void onStart() { Watchers.bind(this); } } ᔄࣳਞق & ᯿຅ // Define an Event public interface PushWatcher extents Watchers.Watcher { void notify(Message message); } // Publishing an Event Watchers.of(PushWatcher.class).notify(message); // Subscribing to an Event public class MyFragment extends Fragment implement PushWatcher { public void notify(Message message) { } public void onStart() { Watchers.bind(this); } }
28. Ԫկᖀಥ PushWatcher UpdateWatcher WeReadFragment
29. ᦈᴅग़ӻፓຽ PushWatcher NetworkChanged WeReadFragment
30. ັತ᧣አ & ᦈᴅ
31. ັತ᧣አ & ᦈᴅ
32. ᕚᑕᯈᗝ Watchers.bind( this, WRSchedulers.context(this) );
33. ᕚᑕᯈᗝ Watchers.bind( this, WRSchedulers.context(this) ); Watchers.bind( this, WRSchedulers.context(this) );
34. ളත෯ၾ௳ ᦈᴅ ݎ૲
35. ളත෯ၾ௳ 1 ᦈᴅ ݎ૲
36. ളත෯ၾ௳ 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ
37. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ
38. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ 2
39. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ 2 ๋ᬪӞེ
40. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ 2 ๋ᬪӞེ 2
41. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ 2 ๋ᬪӞེ 2 զڹಅํ
42. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ 2 ๋ᬪӞེ 2 զڹಅํ 2 1
43. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ 2 ๋ᬪӞེ 2 զڹಅํ 2 1 3
44. ളත෯ၾ௳ 2 1 ᦈᴅ ݎ૲ ἕᦊᤈԅ 2 ๋ᬪӞེ 2 զڹಅํ 2 1 3 3 3 3
45. ᷇ሲᴴګ
47. ӥ᫹
48. ӥ᫹ 50ms 50ms 50ms
49. ӥ᫹ 50ms 50ms 50ms 50msࢧ᧣ Ԇᕚᑕᔺ஬෸ಲ୒
50. ᷇ሲᴴګ @Watchers.Config(
 sample = 50,
 backpressureDrop = true,
 subject = Watchers.Subjects.BEHAVIOR
 )
 public interface LoadingWatcher extends Watchers.Watcher {
 void chapterProgress(LoadingProgress progress);
 }
51. ᷇ሲᴴګ @Watchers.Config(
 sample = 50,
 backpressureDrop = true,
 subject = Watchers.Subjects.BEHAVIOR
 )
 public interface LoadingWatcher extends Watchers.Watcher {
 void chapterProgress(LoadingProgress progress);
 } @Watchers.Config(
 sample = 50,
 backpressureDrop = true,
 subject = Watchers.Subjects.BEHAVIOR
 )
 public interface LoadingWatcher extends Watchers.Watcher {
 void chapterProgress(LoadingProgress progress);
 }
52. ᨀᨀ Q & A