flutter isolate 处理耗时任务支持web

引用插件isolate_manager

import 'package:isolate_manager/isolate_manager.dart';

class MixIsolater {
  IsolateManager isolateManager;

  Function(dynamic)? onMessageCallBack;

  MixIsolater(this.isolateManager, this.onMessageCallBack) {
    isolateManager.onMessage.listen((event) {
      onMessageCallBack?.call(event);
    });
  }

  Future<void> satrt() async {
    await isolateManager.start();
  }

  sendMessage(dynamic params) {
    isolateManager.sendMessage(params);
  }

  onClose() {
    isolateManager.stop();
  }

  Stream get onMessage {
    return isolateManager.onMessage;
  }
}

具体使用方法

// 声明
/// 这个方法必须是
final IsolateManager _importManager = IsolateManager.create(
    importExcel,
    concurrent: 2,
  );
late MixIsolater _isolater;

// 初始时候使用
init(){
   // 定义单线程
    _isolater = MixIsolater(_importManager, _onImportCallback);
    _isolater.satrt();
}

// 触发使用，传递参数
onMethod(){
  _isolater.sendMessage("params");
}

// 监听回调结果函数
_onImportCallback(dynamic jsonStr) {
}

// 导入excel文件
@pragma('vm:entry-point')
Future<String?> importExcel(dynamic message) async {
  String? excelJson = await ExcelToJson().convert();
  return excelJson;
}