https://github.com/muthuishere/declarativex

Composable approach to exception & conditions in Java
https://github.com/muthuishere/declarativex

declarative-programming exception-handling java

Last synced: 5 months ago
JSON representation

Composable approach to exception & conditions in Java

• Host: GitHub
• URL: https://github.com/muthuishere/declarativex
• Owner: muthuishere
• License: apache-2.0
• Created: 2021-08-11T12:37:08.000Z (over 3 years ago)
• Default Branch: main
• Last Pushed: 2021-09-12T05:29:39.000Z (over 3 years ago)
• Last Synced: 2024-07-30T18:00:36.208Z (9 months ago)
• Topics: declarative-programming, exception-handling, java
• Language: Java
• Homepage:
• Size: 931 KB
• Stars: 7
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: ReadMe.md
  • License: LICENSE

Awesome Lists containing this project

README

        
### DeclarativeX

######  A Composable approach to exception & conditions in Java

![Coverage](.github/badges/jacoco.svg)

![Branches](.github/badges/branches.svg)

![Composing Exceptions with DeclarativeX](https://github.com/muthuishere/declarativex-example/blob/main/assets/withthis1.png?raw=true)

----

![Composing Exceptions with DeclarativeX for same parameters](https://github.com/muthuishere/declarativex-example/blob/main/assets/withthis2.png?raw=true)

----

![On Error](https://github.com/muthuishere/declarativex-example/blob/main/assets/onerror3.png?raw=true)

Maven

```

        

            io.github.muthuishere

            declarativex            

        

```

    

Gradle

```

implementation "io.github.muthuishere:declarativex"

```

Usage

```

import declarativex.Try;

import declarativex.Filter;

```

## Try

Instead of Writing This 

```

List results = null;

        try {

            results =newsService.downloadFromNyTimes(topic);

        }catch (Exception e){

            try {

                results =newsService.downloadFromHerald(topic);

            }catch (Exception e1){

                try {

                    results =newsService.downloadFromSun(topic);

                }catch (Exception e2){

                }

            }

        }

```

 

Write This

 

 ```

import declarativex.Try;

        results= Try.from(()->newsService.downloadFromNyTimes(topic))

                        .or(()->newsService.downloadFromHerald(topic))

                        .or(()->newsService.downloadFromSun(topic))

                        .get();

```

Or Even Better way

```

results= Try.any(newsService::downloadFromNyTimes,

                         newsService::downloadFromHerald,

                         newsService::downloadFromSun)

                        .with(topic)

                        .orElseGet(Arrays.asList("Some default"));

```

There are Additional Logging , Peek ,PeekError ,default value can convert to Optional as well

Also there is a lazy version of the same

```

results = Try.lazy.from(this::downloadCacheData)

                .get();

//Evaluation happens only after get is Invoked

```