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ReactContext.java
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ReactContext.java
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/*
* 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.bridge;
import static com.facebook.infer.annotation.ThreadConfined.UI;
import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import androidx.annotation.Nullable;
import com.facebook.common.logging.FLog;
import com.facebook.infer.annotation.Assertions;
import com.facebook.infer.annotation.ThreadConfined;
import com.facebook.react.bridge.queue.MessageQueueThread;
import com.facebook.react.bridge.queue.ReactQueueConfiguration;
import com.facebook.react.common.LifecycleState;
import com.facebook.react.common.ReactConstants;
import com.facebook.react.config.ReactFeatureFlags;
import java.lang.ref.WeakReference;
import java.util.concurrent.CopyOnWriteArraySet;
/**
* Abstract ContextWrapper for Android application or activity {@link Context} and {@link
* CatalystInstance}
*/
public class ReactContext extends ContextWrapper {
private static final String TAG = "ReactContext";
private static final String EARLY_JS_ACCESS_EXCEPTION_MESSAGE =
"Tried to access a JS module before the React instance was fully set up. Calls to "
+ "ReactContext#getJSModule should only happen once initialize() has been called on your "
+ "native module.";
private static final String LATE_JS_ACCESS_EXCEPTION_MESSAGE =
"Tried to access a JS module after the React instance was destroyed.";
private static final String EARLY_NATIVE_MODULE_EXCEPTION_MESSAGE =
"Trying to call native module before CatalystInstance has been set!";
private static final String LATE_NATIVE_MODULE_EXCEPTION_MESSAGE =
"Trying to call native module after CatalystInstance has been destroyed!";
private final CopyOnWriteArraySet<LifecycleEventListener> mLifecycleEventListeners =
new CopyOnWriteArraySet<>();
private final CopyOnWriteArraySet<ActivityEventListener> mActivityEventListeners =
new CopyOnWriteArraySet<>();
private final CopyOnWriteArraySet<WindowFocusChangeListener> mWindowFocusEventListeners =
new CopyOnWriteArraySet<>();
private LifecycleState mLifecycleState = LifecycleState.BEFORE_CREATE;
private volatile boolean mDestroyed = false;
private @Nullable CatalystInstance mCatalystInstance;
private @Nullable LayoutInflater mInflater;
private @Nullable MessageQueueThread mUiMessageQueueThread;
private @Nullable MessageQueueThread mNativeModulesMessageQueueThread;
private @Nullable MessageQueueThread mJSMessageQueueThread;
private @Nullable NativeModuleCallExceptionHandler mNativeModuleCallExceptionHandler;
private @Nullable NativeModuleCallExceptionHandler mExceptionHandlerWrapper;
private @Nullable WeakReference<Activity> mCurrentActivity;
public ReactContext(Context base) {
super(base);
}
/** Set and initialize CatalystInstance for this Context. This should be called exactly once. */
public void initializeWithInstance(CatalystInstance catalystInstance) {
if (catalystInstance == null) {
throw new IllegalArgumentException("CatalystInstance cannot be null.");
}
if (mCatalystInstance != null) {
throw new IllegalStateException("ReactContext has been already initialized");
}
if (mDestroyed) {
ReactSoftException.logSoftException(
TAG,
new IllegalStateException("Cannot initialize ReactContext after it has been destroyed."));
}
mCatalystInstance = catalystInstance;
ReactQueueConfiguration queueConfig = catalystInstance.getReactQueueConfiguration();
initializeMessageQueueThreads(queueConfig);
}
/**
* Initialize message queue threads using a ReactQueueConfiguration. TODO (janzer) T43898341 Make
* this package instead of public
*/
public void initializeMessageQueueThreads(ReactQueueConfiguration queueConfig) {
if (mUiMessageQueueThread != null
|| mNativeModulesMessageQueueThread != null
|| mJSMessageQueueThread != null) {
throw new IllegalStateException("Message queue threads already initialized");
}
mUiMessageQueueThread = queueConfig.getUIQueueThread();
mNativeModulesMessageQueueThread = queueConfig.getNativeModulesQueueThread();
mJSMessageQueueThread = queueConfig.getJSQueueThread();
}
public void resetPerfStats() {
if (mNativeModulesMessageQueueThread != null) {
mNativeModulesMessageQueueThread.resetPerfStats();
}
if (mJSMessageQueueThread != null) {
mJSMessageQueueThread.resetPerfStats();
}
}
public void setNativeModuleCallExceptionHandler(
@Nullable NativeModuleCallExceptionHandler nativeModuleCallExceptionHandler) {
mNativeModuleCallExceptionHandler = nativeModuleCallExceptionHandler;
}
private void raiseCatalystInstanceMissingException() {
throw new IllegalStateException(
mDestroyed ? LATE_NATIVE_MODULE_EXCEPTION_MESSAGE : EARLY_NATIVE_MODULE_EXCEPTION_MESSAGE);
}
// We override the following method so that views inflated with the inflater obtained from this
// context return the ReactContext in #getContext(). The default implementation uses the base
// context instead, so it couldn't be cast to ReactContext.
// TODO: T7538796 Check requirement for Override of getSystemService ReactContext
@Override
public Object getSystemService(String name) {
if (LAYOUT_INFLATER_SERVICE.equals(name)) {
if (mInflater == null) {
mInflater = LayoutInflater.from(getBaseContext()).cloneInContext(this);
}
return mInflater;
}
return getBaseContext().getSystemService(name);
}
/**
* @return handle to the specified JS module for the CatalystInstance associated with this Context
*/
public <T extends JavaScriptModule> T getJSModule(Class<T> jsInterface) {
if (mCatalystInstance == null) {
if (mDestroyed) {
throw new IllegalStateException(LATE_JS_ACCESS_EXCEPTION_MESSAGE);
}
throw new IllegalStateException(EARLY_JS_ACCESS_EXCEPTION_MESSAGE);
}
return mCatalystInstance.getJSModule(jsInterface);
}
public <T extends NativeModule> boolean hasNativeModule(Class<T> nativeModuleInterface) {
if (mCatalystInstance == null) {
raiseCatalystInstanceMissingException();
}
return mCatalystInstance.hasNativeModule(nativeModuleInterface);
}
/** @return the instance of the specified module interface associated with this ReactContext. */
public <T extends NativeModule> T getNativeModule(Class<T> nativeModuleInterface) {
if (mCatalystInstance == null) {
raiseCatalystInstanceMissingException();
}
return mCatalystInstance.getNativeModule(nativeModuleInterface);
}
public CatalystInstance getCatalystInstance() {
return Assertions.assertNotNull(mCatalystInstance);
}
public boolean hasActiveCatalystInstance() {
return mCatalystInstance != null && !mCatalystInstance.isDestroyed();
}
public boolean hasCatalystInstance() {
return mCatalystInstance != null;
}
public LifecycleState getLifecycleState() {
return mLifecycleState;
}
public void addLifecycleEventListener(final LifecycleEventListener listener) {
mLifecycleEventListeners.add(listener);
if (hasActiveCatalystInstance()) {
switch (mLifecycleState) {
case BEFORE_CREATE:
case BEFORE_RESUME:
break;
case RESUMED:
runOnUiQueueThread(
new Runnable() {
@Override
public void run() {
if (!mLifecycleEventListeners.contains(listener)) {
return;
}
try {
listener.onHostResume();
} catch (RuntimeException e) {
handleException(e);
}
}
});
break;
default:
throw new IllegalStateException("Unhandled lifecycle state.");
}
}
}
public void removeLifecycleEventListener(LifecycleEventListener listener) {
mLifecycleEventListeners.remove(listener);
}
public void addActivityEventListener(ActivityEventListener listener) {
mActivityEventListeners.add(listener);
}
public void removeActivityEventListener(ActivityEventListener listener) {
mActivityEventListeners.remove(listener);
}
public void addWindowFocusChangeListener(WindowFocusChangeListener listener) {
mWindowFocusEventListeners.add(listener);
}
public void removeWindowFocusChangeListener(WindowFocusChangeListener listener) {
mWindowFocusEventListeners.remove(listener);
}
/** Should be called by the hosting Fragment in {@link Fragment#onResume} */
public void onHostResume(@Nullable Activity activity) {
mLifecycleState = LifecycleState.RESUMED;
mCurrentActivity = new WeakReference(activity);
ReactMarker.logMarker(ReactMarkerConstants.ON_HOST_RESUME_START);
for (LifecycleEventListener listener : mLifecycleEventListeners) {
try {
listener.onHostResume();
} catch (RuntimeException e) {
handleException(e);
}
}
ReactMarker.logMarker(ReactMarkerConstants.ON_HOST_RESUME_END);
}
@ThreadConfined(UI)
public void onNewIntent(@Nullable Activity activity, Intent intent) {
UiThreadUtil.assertOnUiThread();
mCurrentActivity = new WeakReference(activity);
for (ActivityEventListener listener : mActivityEventListeners) {
try {
listener.onNewIntent(intent);
} catch (RuntimeException e) {
handleException(e);
}
}
}
/** Should be called by the hosting Fragment in {@link Fragment#onPause} */
public void onHostPause() {
mLifecycleState = LifecycleState.BEFORE_RESUME;
ReactMarker.logMarker(ReactMarkerConstants.ON_HOST_PAUSE_START);
for (LifecycleEventListener listener : mLifecycleEventListeners) {
try {
listener.onHostPause();
} catch (RuntimeException e) {
handleException(e);
}
}
ReactMarker.logMarker(ReactMarkerConstants.ON_HOST_PAUSE_END);
}
/** Should be called by the hosting Fragment in {@link Fragment#onDestroy} */
@ThreadConfined(UI)
public void onHostDestroy() {
UiThreadUtil.assertOnUiThread();
mLifecycleState = LifecycleState.BEFORE_CREATE;
for (LifecycleEventListener listener : mLifecycleEventListeners) {
try {
listener.onHostDestroy();
} catch (RuntimeException e) {
handleException(e);
}
}
mCurrentActivity = null;
}
/** Destroy this instance, making it unusable. */
@ThreadConfined(UI)
public void destroy() {
UiThreadUtil.assertOnUiThread();
mDestroyed = true;
if (mCatalystInstance != null) {
mCatalystInstance.destroy();
if (ReactFeatureFlags.nullifyCatalystInstanceOnDestroy) {
mCatalystInstance = null;
}
}
}
/** Should be called by the hosting Fragment in {@link Fragment#onActivityResult} */
public void onActivityResult(Activity activity, int requestCode, int resultCode, Intent data) {
for (ActivityEventListener listener : mActivityEventListeners) {
try {
listener.onActivityResult(activity, requestCode, resultCode, data);
} catch (RuntimeException e) {
handleException(e);
}
}
}
@ThreadConfined(UI)
public void onWindowFocusChange(boolean hasFocus) {
UiThreadUtil.assertOnUiThread();
for (WindowFocusChangeListener listener : mWindowFocusEventListeners) {
try {
listener.onWindowFocusChange(hasFocus);
} catch (RuntimeException e) {
handleException(e);
}
}
}
public void assertOnUiQueueThread() {
Assertions.assertNotNull(mUiMessageQueueThread).assertIsOnThread();
}
public boolean isOnUiQueueThread() {
return Assertions.assertNotNull(mUiMessageQueueThread).isOnThread();
}
public void runOnUiQueueThread(Runnable runnable) {
Assertions.assertNotNull(mUiMessageQueueThread).runOnQueue(runnable);
}
public void assertOnNativeModulesQueueThread() {
Assertions.assertNotNull(mNativeModulesMessageQueueThread).assertIsOnThread();
}
public void assertOnNativeModulesQueueThread(String message) {
Assertions.assertNotNull(mNativeModulesMessageQueueThread).assertIsOnThread(message);
}
public boolean isOnNativeModulesQueueThread() {
return Assertions.assertNotNull(mNativeModulesMessageQueueThread).isOnThread();
}
public void runOnNativeModulesQueueThread(Runnable runnable) {
Assertions.assertNotNull(mNativeModulesMessageQueueThread).runOnQueue(runnable);
}
public void assertOnJSQueueThread() {
Assertions.assertNotNull(mJSMessageQueueThread).assertIsOnThread();
}
public boolean isOnJSQueueThread() {
return Assertions.assertNotNull(mJSMessageQueueThread).isOnThread();
}
public void runOnJSQueueThread(Runnable runnable) {
Assertions.assertNotNull(mJSMessageQueueThread).runOnQueue(runnable);
}
/**
* Passes the given exception to the current {@link
* com.facebook.react.bridge.NativeModuleCallExceptionHandler} if one exists, rethrowing
* otherwise.
*/
public void handleException(Exception e) {
boolean catalystInstanceVariableExists = mCatalystInstance != null;
boolean isCatalystInstanceAlive =
catalystInstanceVariableExists && !mCatalystInstance.isDestroyed();
boolean hasExceptionHandler = mNativeModuleCallExceptionHandler != null;
if (isCatalystInstanceAlive && hasExceptionHandler) {
mNativeModuleCallExceptionHandler.handleException(e);
} else {
FLog.e(
ReactConstants.TAG,
"Unable to handle Exception - catalystInstanceVariableExists: "
+ catalystInstanceVariableExists
+ " - isCatalystInstanceAlive: "
+ !isCatalystInstanceAlive
+ " - hasExceptionHandler: "
+ hasExceptionHandler,
e);
throw new IllegalStateException(e);
}
}
public class ExceptionHandlerWrapper implements NativeModuleCallExceptionHandler {
@Override
public void handleException(Exception e) {
ReactContext.this.handleException(e);
}
}
public NativeModuleCallExceptionHandler getExceptionHandler() {
if (mExceptionHandlerWrapper == null) {
mExceptionHandlerWrapper = new ExceptionHandlerWrapper();
}
return mExceptionHandlerWrapper;
}
public boolean hasCurrentActivity() {
return mCurrentActivity != null && mCurrentActivity.get() != null;
}
/**
* Same as {@link Activity#startActivityForResult(Intent, int)}, this just redirects the call to
* the current activity. Returns whether the activity was started, as this might fail if this was
* called before the context is in the right state.
*/
public boolean startActivityForResult(Intent intent, int code, Bundle bundle) {
Activity activity = getCurrentActivity();
Assertions.assertNotNull(activity);
activity.startActivityForResult(intent, code, bundle);
return true;
}
/**
* Get the activity to which this context is currently attached, or {@code null} if not attached.
* DO NOT HOLD LONG-LIVED REFERENCES TO THE OBJECT RETURNED BY THIS METHOD, AS THIS WILL CAUSE
* MEMORY LEAKS.
*/
public @Nullable Activity getCurrentActivity() {
if (mCurrentActivity == null) {
return null;
}
return mCurrentActivity.get();
}
/** @deprecated DO NOT USE, this method will be removed in the near future. */
public boolean isBridgeless() {
return false;
}
/**
* Get the C pointer (as a long) to the JavaScriptCore context associated with this instance. Use
* the following pattern to ensure that the JS context is not cleared while you are using it:
* JavaScriptContextHolder jsContext = reactContext.getJavaScriptContextHolder()
* synchronized(jsContext) { nativeThingNeedingJsContext(jsContext.get()); }
*/
public JavaScriptContextHolder getJavaScriptContextHolder() {
return mCatalystInstance.getJavaScriptContextHolder();
}
public JSIModule getJSIModule(JSIModuleType moduleType) {
if (!hasActiveCatalystInstance()) {
throw new IllegalStateException(
"Unable to retrieve a JSIModule if CatalystInstance is not active.");
}
return mCatalystInstance.getJSIModule(moduleType);
}
}