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This project delivers the Piranha Micro Core code. It sets up the "global" environment for a micro instance, such as JNDI, a URL handler, a default identity store, and the annotation index. It creates a web application that it either returns or deploys itself to an embedded HTTP server.

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package cloud.piranha.micro.core;

import static org.jboss.weld.environment.deployment.discovery.jandex.Jandex.INDEX_ATTRIBUTE_NAME;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;

import jakarta.annotation.Priority;

import org.jboss.jandex.Index;
import org.jboss.jandex.IndexReader;
import org.jboss.weld.environment.deployment.discovery.BeanArchiveBuilder;
import org.jboss.weld.environment.deployment.discovery.BeanArchiveHandler;

/**
 * An Archive handler for Weld that implicitly reads the classes in
 * an archive deployed to Piranha via the META-INF/piranha.idx file.
 * 
 * @author Arjan Tijms
 */
@Priority(10)
public class PiranhaBeanArchiveHandler implements BeanArchiveHandler {

    @Override
    public BeanArchiveBuilder handle(String beanArchiveReference) {
        
        String indexURL = null;
        
        // We're only handling the classes in the application archive, which is represented
        // by /WEB-INF/classes
        if ("/WEB-INF/classes".equals(beanArchiveReference)) {
            indexURL = "shrinkwrap://cloud.piranha.modular.classes/META-INF/jandex.idx";
        } else {
            try {
                @SuppressWarnings("deprecation")
                URL url = new URL(beanArchiveReference);
                String protocol = url.getProtocol();
                if (!protocol.equals("shrinkwrap")) {
                    return null;
                }
                
                indexURL = "shrinkwrap://" + url.getHost() + "/META-INF/jandex.idx";
                
            } catch (MalformedURLException e1) {
                throw new IllegalStateException(e1);
            }
        }
        
        // The beanArchiveBuilder is a builder the native archive type for Weld.
        // It roughly corresponds to a Shrinkwrap Archive builder.
        BeanArchiveBuilder beanArchiveBuilder = new BeanArchiveBuilder();
        
        // Get the class and annotation index 
        Index index = getIndex(indexURL);
        
        beanArchiveBuilder.setAttribute(INDEX_ATTRIBUTE_NAME, index);
        
        // Populate the Weld Archive with all the classes from the index, representing
        // the original application archive.
        index.getKnownClasses()
             .stream()
             .map(e -> e.asClass().name().toString())
             .forEach(beanArchiveBuilder::addClass);
        
        return beanArchiveBuilder;
    }
    
    Index getIndex(String indexURL) {
        try (InputStream indexStream = Thread.currentThread().getContextClassLoader().getResourceAsStream(indexURL)) {
            return new IndexReader(indexStream).read();
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }

    }

}