Added performance benchmarks to background platform channels for iOS. (#97991)

dev/benchmarks/platform_channels_benchmarks/ios/Runner/AppDelegate.h

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <Foundation/Foundation.h>
+#import <Flutter/Flutter.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface AppDelegate : FlutterAppDelegate
+
+@end
+
+NS_ASSUME_NONNULL_END

dev/benchmarks/platform_channels_benchmarks/ios/Runner/AppDelegate.m

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import "AppDelegate.h"
+@import Flutter;
+#import "GeneratedPluginRegistrant.h"
+
+@implementation AppDelegate
+
+- (BOOL)application:(UIApplication *)application
+didFinishLaunchingWithOptions:(NSDictionary<UIApplicationLaunchOptionsKey, id> *)launchOptions {
+  [GeneratedPluginRegistrant registerWithRegistry:self];
+  NSObject<FlutterPluginRegistrar>* registrar = [self registrarForPlugin:@"Echo"];
+  FlutterBasicMessageChannel* reset = [[FlutterBasicMessageChannel alloc] initWithName:@"dev.flutter.echo.reset" binaryMessenger:registrar.messenger codec:FlutterStandardMessageCodec.sharedInstance];
+  [reset setMessageHandler:^(id  _Nullable message, FlutterReply  _Nonnull callback) {
+    // noop
+  }];
+  FlutterBasicMessageChannel* basicStandard = [[FlutterBasicMessageChannel alloc] initWithName:@"dev.flutter.echo.basic.standard" binaryMessenger:registrar.messenger codec:FlutterStandardMessageCodec.sharedInstance];
+  [basicStandard setMessageHandler:^(id  _Nullable message, FlutterReply  _Nonnull callback) {
+    callback(message);
+  }];
+  FlutterBasicMessageChannel* basicBinary = [[FlutterBasicMessageChannel alloc] initWithName:@"dev.flutter.echo.basic.binary" binaryMessenger:registrar.messenger codec:FlutterBinaryCodec.sharedInstance];
+  [basicBinary setMessageHandler:^(id  _Nullable message, FlutterReply  _Nonnull callback) {
+    callback(message);
+  }];
+  NSObject<FlutterTaskQueue>* taskQueue = [registrar.messenger makeBackgroundTaskQueue];
+  FlutterBasicMessageChannel* background =
+  [[FlutterBasicMessageChannel alloc] initWithName:@"dev.flutter.echo.background.standard" binaryMessenger:registrar.messenger codec:FlutterStandardMessageCodec.sharedInstance taskQueue:taskQueue];
+  [background setMessageHandler:^(id  _Nullable message, FlutterReply  _Nonnull callback) {
+    callback(message);
+  }];
+  return YES;
+}
+
+@end

dev/benchmarks/platform_channels_benchmarks/ios/Runner/AppDelegate.swift

-// Copyright 2014 The Flutter Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-import Flutter
-import UIKit
-
-@UIApplicationMain
-@objc class AppDelegate: FlutterAppDelegate {
-  override func application(
-    _ application: UIApplication,
-    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
-  ) -> Bool {
-    GeneratedPluginRegistrant.register(with: self)
-
-    let registrar = self.registrar(forPlugin: "Echo")!
-    let reset = FlutterBasicMessageChannel(
-      name: "dev.flutter.echo.reset", binaryMessenger: registrar.messenger())
-    reset.setMessageHandler { (input, reply) in
-      // noop
-    }
-    let basicStandard = FlutterBasicMessageChannel(
-      name: "dev.flutter.echo.basic.standard", binaryMessenger: registrar.messenger(),
-      codec: FlutterStandardMessageCodec.sharedInstance())
-    basicStandard.setMessageHandler { (input, reply) in
-      reply(input)
-    }
-    let basicBinary = FlutterBasicMessageChannel(
-      name: "dev.flutter.echo.basic.binary", binaryMessenger: registrar.messenger(),
-      codec: FlutterBinaryCodec())
-    basicBinary.setMessageHandler { (input, reply) in
-      reply(input)
-    }
-
-    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
-  }
-}

dev/benchmarks/platform_channels_benchmarks/ios/Runner/main.m

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#import <UIKit/UIKit.h>
+#import "AppDelegate.h"
+
+int main(int argc, char * argv[]) {
+  NSString * appDelegateClassName;
+  @autoreleasepool {
+      // Setup code that might create autoreleased objects goes here.
+      appDelegateClassName = NSStringFromClass([AppDelegate class]);
+  }
+  return UIApplicationMain(argc, argv, nil, appDelegateClassName);
+}

dev/benchmarks/platform_channels_benchmarks/lib/main.dart

@@ -3,7 +3,6 @@
 // found in the LICENSE file.
 
 import 'dart:async';
-import 'dart:io' show Platform;
 import 'dart:math' as math;
 import 'dart:typed_data';
 
@@ -161,6 +160,7 @@ Future<void> _runTest({
   required String name,
   required int numMessages,
 }) async {
+  print('running $name');
   resetChannel.send(true);
   // Prime test.
   await test(1);
@@ -247,7 +247,6 @@ Future<void> _runTests() async {
     name: 'platform_channel_basic_standard_2host_small_parallel_3',
     numMessages: numMessages,
   );
-  if (Platform.isAndroid) {
   // Background platform channels aren't yet implemented for iOS.
   const BasicMessageChannel<Object?> backgroundStandard =
       BasicMessageChannel<Object?>(
@@ -264,8 +263,7 @@ Future<void> _runTests() async {
     numMessages: numMessages,
   );
   await _runTest(
-      test: (int x) =>
-          _runBasicStandardParallel(backgroundStandard, x, 1234, 3),
+    test: (int x) => _runBasicStandardParallel(backgroundStandard, x, 1234, 3),
     resetChannel: resetChannel,
     printer: printer,
     description:
@@ -273,7 +271,6 @@ Future<void> _runTests() async {
     name: 'platform_channel_basic_standard_2hostbackground_small_parallel_3',
     numMessages: numMessages,
   );
-  }
   printer.printToStdout();
 }