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react-native-macos
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Split EventDispatcher into interface and impl (#28983) 

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/28983

Creating an interface for EventDispatcher so I can implement it from a dummy/no-op EventDispatcher to use in bridgeless mode when the instance isn't alive.

Changelog: [Android] [Changed] Renamed EventDispatcher to EventDispatcherImpl and created EventDispatcher interface; calls to EventDispatcher contstructor need to be updated

Reviewed By: makovkastar

Differential Revision: D21695401

fbshipit-source-id: 46066a467efcf03a5f484bb9fb58c662d46a2c4e
This commit is contained in:
Emily Janzer 2020-05-26 14:29:39 -07:00 коммит произвёл Facebook GitHub Bot
Родитель ae7df2df22
Коммит 68c0eddb71
3 изменённых файлов: 402 добавлений и 367 удалений
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5
ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModule.java
Просмотреть файл

@ -43,6 +43,7 @@ import com.facebook.react.module.annotations.ReactModule;
import com.facebook.react.uimanager.common.ViewUtil;
import com.facebook.react.uimanager.debug.NotThreadSafeViewHierarchyUpdateDebugListener;
import com.facebook.react.uimanager.events.EventDispatcher;
import com.facebook.react.uimanager.events.EventDispatcherImpl;
import com.facebook.react.uimanager.events.RCTEventEmitter;
import com.facebook.systrace.Systrace;
import com.facebook.systrace.SystraceMessage;
@ -156,7 +157,7 @@ public class UIManagerModule extends ReactContextBaseJavaModule
int minTimeLeftInFrameForNonBatchedOperationMs) {
super(reactContext);
DisplayMetricsHolder.initDisplayMetricsIfNotInitialized(reactContext);
mEventDispatcher = new EventDispatcher(reactContext);
mEventDispatcher = new EventDispatcherImpl(reactContext);
mModuleConstants = createConstants(viewManagerResolver);
mCustomDirectEvents = UIManagerModuleConstants.getDirectEventTypeConstants();
mViewManagerRegistry = new ViewManagerRegistry(viewManagerResolver);
@ -178,7 +179,7 @@ public class UIManagerModule extends ReactContextBaseJavaModule
int minTimeLeftInFrameForNonBatchedOperationMs) {
super(reactContext);
DisplayMetricsHolder.initDisplayMetricsIfNotInitialized(reactContext);
mEventDispatcher = new EventDispatcher(reactContext);
mEventDispatcher = new EventDispatcherImpl(reactContext);
mCustomDirectEvents = MapBuilder.newHashMap();
mModuleConstants = createConstants(viewManagersList, null, mCustomDirectEvents);
mViewManagerRegistry = new ViewManagerRegistry(viewManagersList);

375
ReactAndroid/src/main/java/com/facebook/react/uimanager/events/EventDispatcher.java
Просмотреть файл

@ -7,383 +7,28 @@
package com.facebook.react.uimanager.events;
import android.util.LongSparseArray;
import com.facebook.infer.annotation.Assertions;
import com.facebook.react.bridge.LifecycleEventListener;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.UiThreadUtil;
import com.facebook.react.common.MapBuilder;
import com.facebook.react.modules.core.ChoreographerCompat;
import com.facebook.react.modules.core.ReactChoreographer;
import com.facebook.react.uimanager.common.UIManagerType;
import com.facebook.systrace.Systrace;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Class responsible for dispatching UI events to JS. The main purpose of this class is to act as an
* intermediary between UI code generating events and JS, making sure we don't send more events than
* JS can process.
*
* <p>To use it, create a subclass of {@link Event} and call {@link #dispatchEvent(Event)} whenever
* there's a UI event to dispatch.
*
* <p>This class works by installing a Choreographer frame callback on the main thread. This
* callback then enqueues a runnable on the JS thread (if one is not already pending) that is
* responsible for actually dispatch events to JS. This implementation depends on the properties
* that 1) FrameCallbacks run after UI events have been processed in Choreographer.java 2) when we
* enqueue a runnable on the JS queue thread, it won't be called until after any previously enqueued
* JS jobs have finished processing
*
* <p>If JS is taking a long time processing events, then the UI events generated on the UI thread
* can be coalesced into fewer events so that when the runnable runs, we don't overload JS with a
* ton of events and make it get even farther behind.
*
* <p>Ideally, we don't need this and JS is fast enough to process all the events each frame, but
* bad things happen, including load on CPUs from the system, and we should handle this case well.
*
* <p>== Event Cookies ==
*
* <p>An event cookie is made up of the event type id, view tag, and a custom coalescing key. Only
* Events that have the same cookie can be coalesced.
*
* <p>Event Cookie Composition: VIEW_TAG_MASK = 0x00000000ffffffff EVENT_TYPE_ID_MASK =
* 0x0000ffff00000000 COALESCING_KEY_MASK = 0xffff000000000000
*/
public class EventDispatcher implements LifecycleEventListener {
private static final Comparator<Event> EVENT_COMPARATOR =
new Comparator<Event>() {
@Override
public int compare(Event lhs, Event rhs) {
if (lhs == null && rhs == null) {
return 0;
}
if (lhs == null) {
return -1;
}
if (rhs == null) {
return 1;
}
long diff = lhs.getTimestampMs() - rhs.getTimestampMs();
if (diff == 0) {
return 0;
} else if (diff < 0) {
return -1;
} else {
return 1;
}
}
};
private final Object mEventsStagingLock = new Object();
private final Object mEventsToDispatchLock = new Object();
private final ReactApplicationContext mReactContext;
private final LongSparseArray<Integer> mEventCookieToLastEventIdx = new LongSparseArray<>();
private final Map<String, Short> mEventNameToEventId = MapBuilder.newHashMap();
private final DispatchEventsRunnable mDispatchEventsRunnable = new DispatchEventsRunnable();
private final ArrayList<Event> mEventStaging = new ArrayList<>();
private final ArrayList<EventDispatcherListener> mListeners = new ArrayList<>();
private final List<BatchEventDispatchedListener> mPostEventDispatchListeners = new ArrayList<>();
private final ScheduleDispatchFrameCallback mCurrentFrameCallback =
new ScheduleDispatchFrameCallback();
private final AtomicInteger mHasDispatchScheduledCount = new AtomicInteger();
private Event[] mEventsToDispatch = new Event[16];
private int mEventsToDispatchSize = 0;
private volatile ReactEventEmitter mReactEventEmitter;
private short mNextEventTypeId = 0;
private volatile boolean mHasDispatchScheduled = false;
public EventDispatcher(ReactApplicationContext reactContext) {
mReactContext = reactContext;
mReactContext.addLifecycleEventListener(this);
mReactEventEmitter = new ReactEventEmitter(mReactContext);
}
public interface EventDispatcher {
/** Sends the given Event to JS, coalescing eligible events if JS is backed up. */
public void dispatchEvent(Event event) {
Assertions.assertCondition(event.isInitialized(), "Dispatched event hasn't been initialized");
void dispatchEvent(Event event);
for (EventDispatcherListener listener : mListeners) {
listener.onEventDispatch(event);
}
synchronized (mEventsStagingLock) {
mEventStaging.add(event);
Systrace.startAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, event.getEventName(), event.getUniqueID());
}
maybePostFrameCallbackFromNonUI();
}
public void dispatchAllEvents() {
maybePostFrameCallbackFromNonUI();
}
private void maybePostFrameCallbackFromNonUI() {
if (mReactEventEmitter != null) {
// If the host activity is paused, the frame callback may not be currently
// posted. Ensure that it is so that this event gets delivered promptly.
mCurrentFrameCallback.maybePostFromNonUI();
} else {
// No JS application has started yet, or resumed. This can happen when a ReactRootView is
// added to view hierarchy, but ReactContext creation has not completed yet. In this case, any
// touch event dispatch will hit this codepath, and we simply queue them so that they
// are dispatched once ReactContext creation completes and JS app is running.
}
}
void dispatchAllEvents();
/** Add a listener to this EventDispatcher. */
public void addListener(EventDispatcherListener listener) {
mListeners.add(listener);
}
void addListener(EventDispatcherListener listener);
/** Remove a listener from this EventDispatcher. */
public void removeListener(EventDispatcherListener listener) {
mListeners.remove(listener);
}
void removeListener(EventDispatcherListener listener);
public void addBatchEventDispatchedListener(BatchEventDispatchedListener listener) {
mPostEventDispatchListeners.add(listener);
}
void addBatchEventDispatchedListener(BatchEventDispatchedListener listener);
public void removeBatchEventDispatchedListener(BatchEventDispatchedListener listener) {
mPostEventDispatchListeners.remove(listener);
}
void removeBatchEventDispatchedListener(BatchEventDispatchedListener listener);
@Override
public void onHostResume() {
maybePostFrameCallbackFromNonUI();
}
void registerEventEmitter(@UIManagerType int uiManagerType, RCTEventEmitter eventEmitter);
@Override
public void onHostPause() {
stopFrameCallback();
}
void unregisterEventEmitter(@UIManagerType int uiManagerType);
@Override
public void onHostDestroy() {
stopFrameCallback();
}
public void onCatalystInstanceDestroyed() {
UiThreadUtil.runOnUiThread(
new Runnable() {
@Override
public void run() {
stopFrameCallback();
}
});
}
private void stopFrameCallback() {
UiThreadUtil.assertOnUiThread();
mCurrentFrameCallback.stop();
}
/**
* We use a staging data structure so that all UI events generated in a single frame are
* dispatched at once. Otherwise, a JS runnable enqueued in a previous frame could run while the
* UI thread is in the process of adding UI events and we might incorrectly send one event this
* frame and another from this frame during the next.
*/
private void moveStagedEventsToDispatchQueue() {
synchronized (mEventsStagingLock) {
synchronized (mEventsToDispatchLock) {
for (int i = 0; i < mEventStaging.size(); i++) {
Event event = mEventStaging.get(i);
if (!event.canCoalesce()) {
addEventToEventsToDispatch(event);
continue;
}
long eventCookie =
getEventCookie(event.getViewTag(), event.getEventName(), event.getCoalescingKey());
Event eventToAdd = null;
Event eventToDispose = null;
Integer lastEventIdx = mEventCookieToLastEventIdx.get(eventCookie);
if (lastEventIdx == null) {
eventToAdd = event;
mEventCookieToLastEventIdx.put(eventCookie, mEventsToDispatchSize);
} else {
Event lastEvent = mEventsToDispatch[lastEventIdx];
Event coalescedEvent = event.coalesce(lastEvent);
if (coalescedEvent != lastEvent) {
eventToAdd = coalescedEvent;
mEventCookieToLastEventIdx.put(eventCookie, mEventsToDispatchSize);
eventToDispose = lastEvent;
mEventsToDispatch[lastEventIdx] = null;
} else {
eventToDispose = event;
}
}
if (eventToAdd != null) {
addEventToEventsToDispatch(eventToAdd);
}
if (eventToDispose != null) {
eventToDispose.dispose();
}
}
}
mEventStaging.clear();
}
}
private long getEventCookie(int viewTag, String eventName, short coalescingKey) {
short eventTypeId;
Short eventIdObj = mEventNameToEventId.get(eventName);
if (eventIdObj != null) {
eventTypeId = eventIdObj;
} else {
eventTypeId = mNextEventTypeId++;
mEventNameToEventId.put(eventName, eventTypeId);
}
return getEventCookie(viewTag, eventTypeId, coalescingKey);
}
private static long getEventCookie(int viewTag, short eventTypeId, short coalescingKey) {
return viewTag
| (((long) eventTypeId) & 0xffff) << 32
| (((long) coalescingKey) & 0xffff) << 48;
}
public void registerEventEmitter(@UIManagerType int uiManagerType, RCTEventEmitter eventEmitter) {
mReactEventEmitter.register(uiManagerType, eventEmitter);
}
public void unregisterEventEmitter(@UIManagerType int uiManagerType) {
mReactEventEmitter.unregister(uiManagerType);
}
private class ScheduleDispatchFrameCallback extends ChoreographerCompat.FrameCallback {
private volatile boolean mIsPosted = false;
private boolean mShouldStop = false;
@Override
public void doFrame(long frameTimeNanos) {
UiThreadUtil.assertOnUiThread();
if (mShouldStop) {
mIsPosted = false;
} else {
post();
}
Systrace.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "ScheduleDispatchFrameCallback");
try {
moveStagedEventsToDispatchQueue();
if (!mHasDispatchScheduled) {
mHasDispatchScheduled = true;
Systrace.startAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE,
"ScheduleDispatchFrameCallback",
mHasDispatchScheduledCount.get());
mReactContext.runOnJSQueueThread(mDispatchEventsRunnable);
}
} finally {
Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
public void stop() {
mShouldStop = true;
}
public void maybePost() {
if (!mIsPosted) {
mIsPosted = true;
post();
}
}
private void post() {
ReactChoreographer.getInstance()
.postFrameCallback(ReactChoreographer.CallbackType.TIMERS_EVENTS, mCurrentFrameCallback);
}
public void maybePostFromNonUI() {
if (mIsPosted) {
return;
}
// We should only hit this slow path when we receive events while the host activity is paused.
if (mReactContext.isOnUiQueueThread()) {
maybePost();
} else {
mReactContext.runOnUiQueueThread(
new Runnable() {
@Override
public void run() {
maybePost();
}
});
}
}
}
private class DispatchEventsRunnable implements Runnable {
@Override
public void run() {
Systrace.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "DispatchEventsRunnable");
try {
Systrace.endAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE,
"ScheduleDispatchFrameCallback",
mHasDispatchScheduledCount.getAndIncrement());
mHasDispatchScheduled = false;
Assertions.assertNotNull(mReactEventEmitter);
synchronized (mEventsToDispatchLock) {
if (mEventsToDispatchSize > 0) {
// We avoid allocating an array and iterator, and "sorting" if we don't need to.
// This occurs when the size of mEventsToDispatch is zero or one.
if (mEventsToDispatchSize > 1) {
Arrays.sort(mEventsToDispatch, 0, mEventsToDispatchSize, EVENT_COMPARATOR);
}
for (int eventIdx = 0; eventIdx < mEventsToDispatchSize; eventIdx++) {
Event event = mEventsToDispatch[eventIdx];
// Event can be null if it has been coalesced into another event.
if (event == null) {
continue;
}
Systrace.endAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, event.getEventName(), event.getUniqueID());
event.dispatch(mReactEventEmitter);
event.dispose();
}
clearEventsToDispatch();
mEventCookieToLastEventIdx.clear();
}
}
for (BatchEventDispatchedListener listener : mPostEventDispatchListeners) {
listener.onBatchEventDispatched();
}
} finally {
Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
}
private void addEventToEventsToDispatch(Event event) {
if (mEventsToDispatchSize == mEventsToDispatch.length) {
mEventsToDispatch = Arrays.copyOf(mEventsToDispatch, 2 * mEventsToDispatch.length);
}
mEventsToDispatch[mEventsToDispatchSize++] = event;
}
private void clearEventsToDispatch() {
Arrays.fill(mEventsToDispatch, 0, mEventsToDispatchSize, null);
mEventsToDispatchSize = 0;
}
void onCatalystInstanceDestroyed();
}

389
ReactAndroid/src/main/java/com/facebook/react/uimanager/events/EventDispatcherImpl.java Normal file
Просмотреть файл

@ -0,0 +1,389 @@
/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
package com.facebook.react.uimanager.events;
import android.util.LongSparseArray;
import com.facebook.infer.annotation.Assertions;
import com.facebook.react.bridge.LifecycleEventListener;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.UiThreadUtil;
import com.facebook.react.common.MapBuilder;
import com.facebook.react.modules.core.ChoreographerCompat;
import com.facebook.react.modules.core.ReactChoreographer;
import com.facebook.react.uimanager.common.UIManagerType;
import com.facebook.systrace.Systrace;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicInteger;
/**
* Class responsible for dispatching UI events to JS. The main purpose of this class is to act as an
* intermediary between UI code generating events and JS, making sure we don't send more events than
* JS can process.
*
* <p>To use it, create a subclass of {@link Event} and call {@link #dispatchEvent(Event)} whenever
* there's a UI event to dispatch.
*
* <p>This class works by installing a Choreographer frame callback on the main thread. This
* callback then enqueues a runnable on the JS thread (if one is not already pending) that is
* responsible for actually dispatch events to JS. This implementation depends on the properties
* that 1) FrameCallbacks run after UI events have been processed in Choreographer.java 2) when we
* enqueue a runnable on the JS queue thread, it won't be called until after any previously enqueued
* JS jobs have finished processing
*
* <p>If JS is taking a long time processing events, then the UI events generated on the UI thread
* can be coalesced into fewer events so that when the runnable runs, we don't overload JS with a
* ton of events and make it get even farther behind.
*
* <p>Ideally, we don't need this and JS is fast enough to process all the events each frame, but
* bad things happen, including load on CPUs from the system, and we should handle this case well.
*
* <p>== Event Cookies ==
*
* <p>An event cookie is made up of the event type id, view tag, and a custom coalescing key. Only
* Events that have the same cookie can be coalesced.
*
* <p>Event Cookie Composition: VIEW_TAG_MASK = 0x00000000ffffffff EVENT_TYPE_ID_MASK =
* 0x0000ffff00000000 COALESCING_KEY_MASK = 0xffff000000000000
*/
public class EventDispatcherImpl implements EventDispatcher, LifecycleEventListener {
private static final Comparator<Event> EVENT_COMPARATOR =
new Comparator<Event>() {
@Override
public int compare(Event lhs, Event rhs) {
if (lhs == null && rhs == null) {
return 0;
}
if (lhs == null) {
return -1;
}
if (rhs == null) {
return 1;
}
long diff = lhs.getTimestampMs() - rhs.getTimestampMs();
if (diff == 0) {
return 0;
} else if (diff < 0) {
return -1;
} else {
return 1;
}
}
};
private final Object mEventsStagingLock = new Object();
private final Object mEventsToDispatchLock = new Object();
private final ReactApplicationContext mReactContext;
private final LongSparseArray<Integer> mEventCookieToLastEventIdx = new LongSparseArray<>();
private final Map<String, Short> mEventNameToEventId = MapBuilder.newHashMap();
private final DispatchEventsRunnable mDispatchEventsRunnable = new DispatchEventsRunnable();
private final ArrayList<Event> mEventStaging = new ArrayList<>();
private final ArrayList<EventDispatcherListener> mListeners = new ArrayList<>();
private final List<BatchEventDispatchedListener> mPostEventDispatchListeners = new ArrayList<>();
private final ScheduleDispatchFrameCallback mCurrentFrameCallback =
new ScheduleDispatchFrameCallback();
private final AtomicInteger mHasDispatchScheduledCount = new AtomicInteger();
private Event[] mEventsToDispatch = new Event[16];
private int mEventsToDispatchSize = 0;
private volatile ReactEventEmitter mReactEventEmitter;
private short mNextEventTypeId = 0;
private volatile boolean mHasDispatchScheduled = false;
public EventDispatcherImpl(ReactApplicationContext reactContext) {
mReactContext = reactContext;
mReactContext.addLifecycleEventListener(this);
mReactEventEmitter = new ReactEventEmitter(mReactContext);
}
/** Sends the given Event to JS, coalescing eligible events if JS is backed up. */
public void dispatchEvent(Event event) {
Assertions.assertCondition(event.isInitialized(), "Dispatched event hasn't been initialized");
for (EventDispatcherListener listener : mListeners) {
listener.onEventDispatch(event);
}
synchronized (mEventsStagingLock) {
mEventStaging.add(event);
Systrace.startAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, event.getEventName(), event.getUniqueID());
}
maybePostFrameCallbackFromNonUI();
}
public void dispatchAllEvents() {
maybePostFrameCallbackFromNonUI();
}
private void maybePostFrameCallbackFromNonUI() {
if (mReactEventEmitter != null) {
// If the host activity is paused, the frame callback may not be currently
// posted. Ensure that it is so that this event gets delivered promptly.
mCurrentFrameCallback.maybePostFromNonUI();
} else {
// No JS application has started yet, or resumed. This can happen when a ReactRootView is
// added to view hierarchy, but ReactContext creation has not completed yet. In this case, any
// touch event dispatch will hit this codepath, and we simply queue them so that they
// are dispatched once ReactContext creation completes and JS app is running.
}
}
/** Add a listener to this EventDispatcher. */
public void addListener(EventDispatcherListener listener) {
mListeners.add(listener);
}
/** Remove a listener from this EventDispatcher. */
public void removeListener(EventDispatcherListener listener) {
mListeners.remove(listener);
}
public void addBatchEventDispatchedListener(BatchEventDispatchedListener listener) {
mPostEventDispatchListeners.add(listener);
}
public void removeBatchEventDispatchedListener(BatchEventDispatchedListener listener) {
mPostEventDispatchListeners.remove(listener);
}
@Override
public void onHostResume() {
maybePostFrameCallbackFromNonUI();
}
@Override
public void onHostPause() {
stopFrameCallback();
}
@Override
public void onHostDestroy() {
stopFrameCallback();
}
public void onCatalystInstanceDestroyed() {
UiThreadUtil.runOnUiThread(
new Runnable() {
@Override
public void run() {
stopFrameCallback();
}
});
}
private void stopFrameCallback() {
UiThreadUtil.assertOnUiThread();
mCurrentFrameCallback.stop();
}
/**
* We use a staging data structure so that all UI events generated in a single frame are
* dispatched at once. Otherwise, a JS runnable enqueued in a previous frame could run while the
* UI thread is in the process of adding UI events and we might incorrectly send one event this
* frame and another from this frame during the next.
*/
private void moveStagedEventsToDispatchQueue() {
synchronized (mEventsStagingLock) {
synchronized (mEventsToDispatchLock) {
for (int i = 0; i < mEventStaging.size(); i++) {
Event event = mEventStaging.get(i);
if (!event.canCoalesce()) {
addEventToEventsToDispatch(event);
continue;
}
long eventCookie =
getEventCookie(event.getViewTag(), event.getEventName(), event.getCoalescingKey());
Event eventToAdd = null;
Event eventToDispose = null;
Integer lastEventIdx = mEventCookieToLastEventIdx.get(eventCookie);
if (lastEventIdx == null) {
eventToAdd = event;
mEventCookieToLastEventIdx.put(eventCookie, mEventsToDispatchSize);
} else {
Event lastEvent = mEventsToDispatch[lastEventIdx];
Event coalescedEvent = event.coalesce(lastEvent);
if (coalescedEvent != lastEvent) {
eventToAdd = coalescedEvent;
mEventCookieToLastEventIdx.put(eventCookie, mEventsToDispatchSize);
eventToDispose = lastEvent;
mEventsToDispatch[lastEventIdx] = null;
} else {
eventToDispose = event;
}
}
if (eventToAdd != null) {
addEventToEventsToDispatch(eventToAdd);
}
if (eventToDispose != null) {
eventToDispose.dispose();
}
}
}
mEventStaging.clear();
}
}
private long getEventCookie(int viewTag, String eventName, short coalescingKey) {
short eventTypeId;
Short eventIdObj = mEventNameToEventId.get(eventName);
if (eventIdObj != null) {
eventTypeId = eventIdObj;
} else {
eventTypeId = mNextEventTypeId++;
mEventNameToEventId.put(eventName, eventTypeId);
}
return getEventCookie(viewTag, eventTypeId, coalescingKey);
}
private static long getEventCookie(int viewTag, short eventTypeId, short coalescingKey) {
return viewTag
| (((long) eventTypeId) & 0xffff) << 32
| (((long) coalescingKey) & 0xffff) << 48;
}
public void registerEventEmitter(@UIManagerType int uiManagerType, RCTEventEmitter eventEmitter) {
mReactEventEmitter.register(uiManagerType, eventEmitter);
}
public void unregisterEventEmitter(@UIManagerType int uiManagerType) {
mReactEventEmitter.unregister(uiManagerType);
}
private class ScheduleDispatchFrameCallback extends ChoreographerCompat.FrameCallback {
private volatile boolean mIsPosted = false;
private boolean mShouldStop = false;
@Override
public void doFrame(long frameTimeNanos) {
UiThreadUtil.assertOnUiThread();
if (mShouldStop) {
mIsPosted = false;
} else {
post();
}
Systrace.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "ScheduleDispatchFrameCallback");
try {
moveStagedEventsToDispatchQueue();
if (!mHasDispatchScheduled) {
mHasDispatchScheduled = true;
Systrace.startAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE,
"ScheduleDispatchFrameCallback",
mHasDispatchScheduledCount.get());
mReactContext.runOnJSQueueThread(mDispatchEventsRunnable);
}
} finally {
Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
public void stop() {
mShouldStop = true;
}
public void maybePost() {
if (!mIsPosted) {
mIsPosted = true;
post();
}
}
private void post() {
ReactChoreographer.getInstance()
.postFrameCallback(ReactChoreographer.CallbackType.TIMERS_EVENTS, mCurrentFrameCallback);
}
public void maybePostFromNonUI() {
if (mIsPosted) {
return;
}
// We should only hit this slow path when we receive events while the host activity is paused.
if (mReactContext.isOnUiQueueThread()) {
maybePost();
} else {
mReactContext.runOnUiQueueThread(
new Runnable() {
@Override
public void run() {
maybePost();
}
});
}
}
}
private class DispatchEventsRunnable implements Runnable {
@Override
public void run() {
Systrace.beginSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, "DispatchEventsRunnable");
try {
Systrace.endAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE,
"ScheduleDispatchFrameCallback",
mHasDispatchScheduledCount.getAndIncrement());
mHasDispatchScheduled = false;
Assertions.assertNotNull(mReactEventEmitter);
synchronized (mEventsToDispatchLock) {
if (mEventsToDispatchSize > 0) {
// We avoid allocating an array and iterator, and "sorting" if we don't need to.
// This occurs when the size of mEventsToDispatch is zero or one.
if (mEventsToDispatchSize > 1) {
Arrays.sort(mEventsToDispatch, 0, mEventsToDispatchSize, EVENT_COMPARATOR);
}
for (int eventIdx = 0; eventIdx < mEventsToDispatchSize; eventIdx++) {
Event event = mEventsToDispatch[eventIdx];
// Event can be null if it has been coalesced into another event.
if (event == null) {
continue;
}
Systrace.endAsyncFlow(
Systrace.TRACE_TAG_REACT_JAVA_BRIDGE, event.getEventName(), event.getUniqueID());
event.dispatch(mReactEventEmitter);
event.dispose();
}
clearEventsToDispatch();
mEventCookieToLastEventIdx.clear();
}
}
for (BatchEventDispatchedListener listener : mPostEventDispatchListeners) {
listener.onBatchEventDispatched();
}
} finally {
Systrace.endSection(Systrace.TRACE_TAG_REACT_JAVA_BRIDGE);
}
}
}
private void addEventToEventsToDispatch(Event event) {
if (mEventsToDispatchSize == mEventsToDispatch.length) {
mEventsToDispatch = Arrays.copyOf(mEventsToDispatch, 2 * mEventsToDispatch.length);
}
mEventsToDispatch[mEventsToDispatchSize++] = event;
}
private void clearEventsToDispatch() {
Arrays.fill(mEventsToDispatch, 0, mEventsToDispatchSize, null);
mEventsToDispatchSize = 0;
}
}