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Migrate from native CallInvoker to NativeMethodCallInvoker (#37473)
Summary: Pull Request resolved: #37473 ## Context The TurboModule system uses a CallInvoker interface to schedule JavaScript → native, and native → JavaScript calls. ## Problem JavaScript → native and native → JavaScript calls are different. They can have different behaviours/properties. And, in the future, we might want to evolve them differently. e.g: - JavaScript → native **always** have a method name. Native → JavaScript calls don't. - Native → JavaScript can have priorities, since D41492849. JavaScript → native don't. ## Changes Instead of tying both types of calls to the CallInvoker abstraction, this diff creates a **separate** abstraction for Native → JavaScript calls: NativeMethodCallInvoker. This way, we can evolve both abstractions separately over time: - We can evolve the CallInvoker abstraction to suit the needs of JavaScript → native calls. - We can evolve the NativeMethodCallInvoker abstraction to suite the needs of native → JavaScript calls. This ultimately makes TurboModule system more extensible. ## Motivation For the TurboModule interop layer on iOS, React Native needs to execute the "constantsToExport" method on the main queue, when the module requires main queue setup. (implementation: D45924977). The simplest way to implement this behaviour is to introduce a `methodName` to CallInvoker, and customize the legacy module's CallInvoker::invokeSync method, like so: ``` void invokeSync(std::string methodName, std::function<void()> &&work) override { if (requiresMainQueueSetup_ && methodName == "getConstants") { __block auto retainedWork = std::move(work); RCTUnsafeExecuteOnMainQueueSync(^{ retainedWork(); }); return; } work(); } ``` But, customizing CallInvoker to introduce a `methodName` parameter doesn't make sense: Native → JavaScript calls don't necessarily have method names. So, this diff forks CallInvoker into NativeMethodCallInvoker. That way, we can customize NativeMethodCallInvoker to introduce a method name (which does make sense) and resolve this problem. For the full solution, see D45924977. NOTE: Now that NativeMethodCallInvoker is different from CallInvoker, it might make sense to re-name CallInvoker back to JSCallInvoker. Changelog: [Category][Breaking] - Introduce NativeMethodCallInvoker to replace the TurboModule system's native CallInvoker Reviewed By: javache Differential Revision: D45891627 fbshipit-source-id: 39c3f450a290ad396b715288a50858d33ce78441
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37 changes: 37 additions & 0 deletions
37
.../src/main/java/com/facebook/react/turbomodule/core/NativeMethodCallInvokerHolderImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| package com.facebook.react.turbomodule.core; | ||
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| import com.facebook.jni.HybridData; | ||
| import com.facebook.react.turbomodule.core.interfaces.NativeMethodCallInvokerHolder; | ||
| import com.facebook.soloader.SoLoader; | ||
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| /** | ||
| * NativeMethodCallInvokerHolder is created at a different time/place (i.e: in CatalystInstance) | ||
| * than TurboModuleManager. Therefore, we need to wrap NativeMethodCallInvokerHolder within a hybrid | ||
| * class so that we may pass it from CatalystInstance, through Java, to | ||
| * TurboModuleManager::initHybrid. | ||
| */ | ||
| public class NativeMethodCallInvokerHolderImpl implements NativeMethodCallInvokerHolder { | ||
| private static volatile boolean sIsSoLibraryLoaded; | ||
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| private final HybridData mHybridData; | ||
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| private NativeMethodCallInvokerHolderImpl(HybridData hd) { | ||
| maybeLoadSoLibrary(); | ||
| mHybridData = hd; | ||
| } | ||
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| // Prevents issues with initializer interruptions. See T38996825 and D13793825 for more context. | ||
| private static synchronized void maybeLoadSoLibrary() { | ||
| if (!sIsSoLibraryLoaded) { | ||
| SoLoader.loadLibrary("turbomodulejsijni"); | ||
| sIsSoLibraryLoaded = true; | ||
| } | ||
| } | ||
| } |
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14 changes: 14 additions & 0 deletions
14
...in/java/com/facebook/react/turbomodule/core/interfaces/NativeMethodCallInvokerHolder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,14 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| package com.facebook.react.turbomodule.core.interfaces; | ||
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| /** | ||
| * This interface represents the opaque Java object that contains a pointer to and instance of | ||
| * NativeMethodCallInvoker. | ||
| */ | ||
| public interface NativeMethodCallInvokerHolder {} |
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23 changes: 23 additions & 0 deletions
23
...ReactAndroid/src/main/jni/react/turbomodule/ReactCommon/NativeMethodCallInvokerHolder.cpp
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| /* | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| */ | ||
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| #include "NativeMethodCallInvokerHolder.h" | ||
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| namespace facebook::react { | ||
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| NativeMethodCallInvokerHolder::NativeMethodCallInvokerHolder( | ||
| std::shared_ptr<NativeMethodCallInvoker> nativeMethodCallInvoker) | ||
| : _nativeMethodCallInvoker(nativeMethodCallInvoker) {} | ||
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| std::shared_ptr<NativeMethodCallInvoker> | ||
| NativeMethodCallInvokerHolder::getNativeMethodCallInvoker() { | ||
| return _nativeMethodCallInvoker; | ||
| } | ||
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| void NativeMethodCallInvokerHolder::registerNatives() {} | ||
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| } // namespace facebook::react |
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