Add support for calling into other plugins from a background context on iOS #7843
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Won't this still involve potentially creating multiple instances of a plugin? E.g. this seems like it would fail if I wanted to use sqflite (the single most popular storage related plugin after shared preferences) on both the foreground and background isolate. |
Yes and no. Basically, it really depends on what's included in the callback. In most cases, applications can just do something like this with no problems: void registrationCallback(NSObject<FlutterPluginRegistry>* registry) {
[GeneratedPluginRegistrant registerWith: registry];
}However, in the case of a plugin like sqlite, the implementation can pick and choose which plugins to register: void registrationCallback(NSObject<FlutterPluginRegistry>* registry) {
[GeofencingPlugin registerWith: registry];
[FlutterLocalNotificationsPlugin registerWith:registry];
// etc
}The above is basically the content of This change isn't meant to solve all of the problems with background execution, but will bring iOS up to par with Android for now. |
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Thanks for the explanation! You need to rebase against master to get this to build properly on CI. |
iOS Added `FlutterPluginRegistrantCallback` typedef and optional `setPluginRegistrantCallback` static method in `FlutterPlugin`. `setPluginRegistrantCallback` is used to set a callback defined in AppDelegate.m which registers some subset of plugins with a `FlutterPluginRegistry` (for example, a headless FlutterEngine). This allows for plugins which utilize background execution functionality to enable the use of other plugins on the background isolate. This puts iOS on par with Android for background execution.
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No problem! Thanks for the heads up about the CI. I did this work on a recent revision, but I guess something was broken there. |
flutter/engine@033f207...163a2fd git log 033f207..163a2fd --no-merges --oneline 163a2fd Revert "Android embedding refactor pr3 add remaining systemchannels (#7738)" (flutter/engine#7849) 0d6ff16 Shut down and restart the Dart VM as needed. (flutter/engine#7832) 256db4b Android embedding refactor pr3 add remaining systemchannels (flutter/engine#7738) 02d7ca3 Don't call static method from instance variable (flutter/engine#7841) 10cee61 Delete GL textures when they are released from the texture registry. (flutter/engine#7836) 69e4606 Fix NullPointerException in SurfaceTextureRegistryEntry (flutter/engine#7837) 9a965bc Fix NullPointerException in ResourceCleaner (flutter/engine#7838) 2acd794 Add fml::FileExists implementation for Windows (flutter/engine#7845) fa38a98 Update buildroot to 7f64ff4928e to unblock Mac builds. (flutter/engine#7846) 1ba3295 Add support for calling into other plugins from a background context on iOS (flutter/engine#7843) df2fc97 Roll src/third_party/skia 154acd7a1374..be9aff25bddc (13 commits) (flutter/engine#7842) 0ca1d1f Remove the Dart JIT snapshot data from AOT builds of the embedder library (flutter/engine#7806) c51ea41 Roll src/third_party/skia 7a74c7cb6da0..154acd7a1374 (1 commits) (flutter/engine#7840) ecbaea1 Ensure to pass dill file after VM options for gen_snapshot (flutter/engine#7839) 5d3f714 Roll src/third_party/skia b00f7b34751b..7a74c7cb6da0 (1 commits) (flutter/engine#7835) 7337399 Roll src/third_party/skia 9a88bee122f1..b00f7b34751b (24 commits) (flutter/engine#7831) 6f318ef Move up ndk version that is being downloaded(old one no longer available) (flutter/engine#7830) a8aa1ee Track flow id (flutter/engine#7826) b1ce6b7 Roll src/third_party/skia a0dcd29f536b..9a88bee122f1 (4 commits) (flutter/engine#7825) dbc1663 Roll src/third_party/skia 6152470dc69e..a0dcd29f536b (2 commits) (flutter/engine#7824) 9426776 Roll src/third_party/skia 4037f7f5d8b4..6152470dc69e (1 commits) (flutter/engine#7823) e2394ad Add flow events connecting pointer events to frames (flutter/engine#7807) 0a5a7c5 Roll src/third_party/skia 09c01e9df260..4037f7f5d8b4 (3 commits) (flutter/engine#7821) b867f48 Roll src/third_party/skia 186669c4128b..09c01e9df260 (5 commits) (flutter/engine#7820) af39e22 Fix tests that were committed after cirrus ran (flutter/engine#7819) 1f2cbf7 Roll src/third_party/dart 0a7dcf17eb..c92d5ca288 (64 commits) The AutoRoll server is located here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+/master/autoroll/README.md If the roll is causing failures, please contact the current sheriff (liyuqian@google.com), and stop the roller if necessary.
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Hi everyone Can anyone please give us an example of how to use the plugin in another isolate or background. How we can register plugin to use in the background. Thank you so much. |
Added
FlutterPluginRegistrantCallbacktypedef and optionalsetPluginRegistrantCallbackstatic method inFlutterPlugin.setPluginRegistrantCallbackis used to set a callback defined in AppDelegate.m which registers some subset of plugins with aFlutterPluginRegistry(for example, a headless FlutterEngine). This allows for plugins which utilize background execution functionality to enable the use of other plugins on the background isolate. This puts iOS on par with Android for background execution.Along with updated examples and Medium posts, this fixes flutter/flutter#21925.