Flutter Reactive Programming 介紹 - part 1 (Stream)
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This document provides examples of using StreamControllers and StreamTransformers in Dart. It shows how to create a StreamController, listen to its stream, add data to the controller, and close the stream. It also demonstrates using StreamTransformers to transform or filter data from a stream.
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![>>>>>>>Hello
>>>>>>>123
Stream.fromIterable(['Hello' , 123]).listen((data){
print('>>>>>>>$data');
});](https://image.slidesharecdn.com/aaa-190606215410/85/Flutter-Reactive-Programming-part-1-Stream-6-320.jpg)
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How the US Navy Approaches DevSecOps with Raise 2.0Anchore Join us as Anchore's solutions architect reveals how the U.S. Navy successfully approaches the shift left philosophy to DevSecOps with the RAISE 2.0 Implementation Guide to support its Cyber Ready initiative. This session will showcase practical strategies for defense application teams to pivot from a time-intensive compliance checklist and mindset to continuous cyber-readiness with real-time visibility.
Learn how to break down organizational silos through RAISE 2.0 principles and build efficient, secure pipeline automation that produces the critical security artifacts needed for Authorization to Operate (ATO) approval across military environments.
Integrating Survey123 and R&H Data Using FME
Integrating Survey123 and R&H Data Using FMESafe Software West Virginia Department of Transportation (WVDOT) actively engages in several field data collection initiatives using Collector and Survey 123. A critical component for effective asset management and enhanced analytical capabilities is the integration of Geographic Information System (GIS) data with Linear Referencing System (LRS) data. Currently, RouteID and Measures are not captured in Survey 123. However, we can bridge this gap through FME Flow automation. When a survey is submitted through Survey 123 for ArcGIS Portal (10.8.1), it triggers FME Flow automation. This process uses a customized workbench that interacts with a modified version of Esri's Geometry to Measure API. The result is a JSON response that includes RouteID and Measures, which are then applied to the feature service record.
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Flutter Reactive Programming 介紹 - part 1 (Stream)
- 8. //產生StreamController var _streamController = StreamController<String>(); //監聽 _streamController.stream.listen((String data){ print('>>>>>>>$data'); }); //發送 _streamController.add('Hello'); _streamController.sink.add('World'); //關閉Stream _streamController.close(); >>>>>>>Hello >>>>>>>World
- 10. StreamController<String> _controller = StreamController<String>(); … StreamBuilder<String>( initialData: '', stream: _controller.stream, builder: (BuildContext context, AsyncSnapshot<String> snapshot) { return Text('text=${snapshot.data}', style: TextStyle(fontSize: 30)); }, ) var _text = ''; ... Text('text=$_text', style: TextStyle(fontSize: 30))
- 11. StreamController<String> _controller = StreamController<String>(); var st = StreamTransformer<String, String>.fromHandlers(handleData: (data, sink){ sink.add(data); }); _controller.stream.transform(st);
- 12. //轉換 var st = StreamTransformer<String, String>.fromHandlers(handleData: (data, sink){ sink.add(’ABC : $data'); }); //過濾 var st = StreamTransformer<String, String>.fromHandlers(handleData: (data, sink){ if(data==‘sunny’) sink.add(data); });