Introduction

Data Channel for Dart and Flutter.

data_channel (DC) is a simple dart utility for handling exceptions and data routing. It is not a very ideal solution to handle exceptions using try and catch at every function call, use data_channel instead. data_channel will take care of routing errors and data out of a method.

Installation

Go to https://pub.dev/packages/data_channel#-installing-tab- for the latest version of data_channel

Example

Return error or data from getSomeLoginData method

import 'package:data_channel/data_channel.dart';

Future<DC<Exception, LoginModel>> getSomeLoginData() async {
    try {
      return DC.data(
        someData,
      );
    } on Exception {
      return DC.error(
        CacheException(),
      );
    }
 }

Check for errors

void doSomething() async {
    final value = await getSomeLoginData();

    if (value.hasError) {
      // do something
    } else if (value.hasData) {
      // do something
    }
 }

DC forward Avoid redundant error checks. Easily convert an incoming data model to another one and forward it to the callee. DC.forward will return the error in case it encounters with one else data will be returned.

Future<DC<Exception, UserModel>> checkSomethingAndReturn() {
    final loginData = await getSomeLoginData();

    return DC.forward(
      loginData,
      UserModel(id: loginData.data?.tokenId),
    );
  }

DC pick

  final appData = await getSomeLoginData();
  appData.pick(
    onError: (error) {
      if (error is CacheException) {
        alerts.setException(context, error);
      }
    },
    onData: (data) {
      value1 = data;
    },
    onNoData: () {
      value1 = getDefaultValue();
    },
  );

  // or

  appData.pick(
    onError: (error) {
      if (error is CacheException) {
        alerts.setException(context, error);
      }
    },
    onNoError: (data) {
      if (data != null) {
        value1 = data;

        return;
      }

      value1 = getDefaultValue();
    },
  );

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Contacts

Please feel free to contact me at ganeshrvel@outlook.com

About

• Author: Ganesh Rathinavel
• License: MIT
• Package URL: https://pub.dev/packages/scaff
• Repo URL: https://github.com/ganeshrvel/pub-scaff
• Contacts: ganeshrvel@outlook.com

License

scaff | Scaffold Generator for Dart and Flutter. MIT License.

Copyright © 2018-Present Ganesh Rathinavel