SourceDownloader

Downloading...

Apps can be distributed on various different services, websites, and other potential sources. RepositoryManager is designed to support an infinite amount of them. How does it do it?

A SourceDownloader is a Java interface used represent instructions for how to obtain an application from a given source, implementing an abstract class BaseSourceDownloader.

All SourceDownloaders must be registered using the SourceRegistry object, when registered they become "installed sources" and used by the server during repository indexing.

The following is an example of a SourceDownloader:

ExampleDownloader.java

@Component // Needed so the server knows to instantiate this object automatically
public class ExampleDownloader extends BaseSourceDownloader
{
    @Autowired // Required to receive the registry object
    private ExampleDownloader(SourceRegistry registry)
    {
        // ID, Name, Description
        super("example", "Mysterious Source Downloader", "Downloads a bunch of stuff from somewhere!!");
        // Register the downloader
        registry.registerDownloader(this);
    }

    @Override
    protected Request fetchFileInformation(InstalledApp app, Path archivePath, Path tmpDir)
    {
        Request request = ...
        // Fetch source information for this source type
        // AKA, do all the work to identify the file to download,
        // then return a request for the file to be downloaded.
        return request;
    }

    @Override
    protected void processFiles(InstalledApp app, Path archivePath, Path tmpDir, Request request) throws IOException
    {
        // Process files for this source type
        // AKA, download the file to tmpDir.
    }
}