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https://github.com/devfd/react-native-workers

Background services and web workers for react-native
https://github.com/devfd/react-native-workers

Last synced: 2 months ago
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Background services and web workers for react-native

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# react-native-workers



Spin worker threads and run CPU intensive tasks in the background. Bonus point on Android you can keep a worker alive even when a user quit the application :fireworks:



## Features

- JS web workers for iOS and Android

- access to native modules (network, geolocation, storage ...)

- Android Services in JS :tada:



## Installation



```bash

npm install react-native-workers --save

```



### Automatic setup



simply `rnpm link react-native-workers` and you'r good to go.



### Manual setup



#### iOS



1. Open your project in XCode, right click on Libraries and click Add Files to "Your Project Name". Look under node_modules/react-native-workers/ios and add `Workers.xcodeproj`

2. Add `libWorkers.a` to `Build Phases -> Link Binary With Libraries`



#### Android



in `android/settings.gradle`



```

 include ':app', ':react-native-workers'

 project(':react-native-workers').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-workers/android')

 ```



in `android/app/build.gradle` add:



```

dependencies {

   ...

   compile project(':react-native-workers')

}

```



and finally, in your `MainApplication.java` add:



```java



import co.apptailor.Worker.WorkerPackage; // <--- This!



public class MainApplication extends Application implements ReactApplication {



private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {

    @Override

    protected boolean getUseDeveloperSupport() {

      return BuildConfig.DEBUG;

    }



    @Override

    protected List getPackages() {

      return Arrays.asList(

          new MainReactPackage(),

          new WorkerPackage() // <--- and this

      );

    }

  };



  @Override

  public ReactNativeHost getReactNativeHost() {

      return mReactNativeHost;

  }

}



```



**Note**: only the official react native modules are available from your workers (vibration, fetch, etc...). To include additional modules in your workers add them to the WorkerPackage constructor. Like this:



```java

new WorkerPackage(new MyAwesomePackage(), new MyAmazingPackage())`

```



## JS API



From your application:

```js

import { Worker } from 'react-native-workers';



/* start worker */

const worker = new Worker("path/to/worker.js");



/* post message to worker. String only ! */

worker.postMessage("hello from application");



/* get message from worker. String only ! */

worker.onmessage = (message) => {



}



/* stop worker */

worker.terminate();



```



From your worker js file:

```js

import { self } from 'react-native-workers';



/* get message from application. String only ! */

self.onmessage = (message) => {

}



/* post message to application. String only ! */

self.postMessage("hello from worker");

```



## Lifecycle



- the workers are paused when the app enters in the background

- the workers are resumed once the app is running in the foreground

- During development, when you reload the main JS bundle (shake device -> `Reload`) the workers are killed



## Todo



- [x] Android - download worker files from same location as main bundle

- [x] iOS - download worker files from same location as main bundle

- [ ] script to package worker files for release build

- [x] load worker files from disk if not debug