Reactive examples and integration test

[melloware]

I am not as familiar with Reactive but an example in the docs and an Integration test would be great for someone to add as a good first issue.

https://quarkus.io/guides/resteasy-reactive#multipart

[ggrebert]

The problem with the reactive part is that the AntivirusEngine signature is not ready to implement the feature.

There is not an easy way to implement it without a breaking change.

Reactive signature example with Mutiny:

package io.quarkiverse.antivirus.runtime;

import java.io.InputStream;
import io.smallrye.mutiny.Uni;

/**
 * Service provider interface for virus scanning that might be used in file upload component for example when dealing with
 * untrusted files.
 */
public interface AntivirusEngine {

    /**
     * Indicate whether this {@link AntivirusEngineReactive} is enabled or not.
     *
     * @return <code>true</code> if enabled, <code>false</code> otherwise
     */
    boolean isEnabled();

    /**
     * Perform virus scan and throw exception if a virus has been detected.
     *
     * @param filename the name of the file to scan
     * @param inputStream the inputStream containing the file contents
     * @return the {@link AntivirusScanResult} containing the results
     */
    Uni<AntivirusScanResult> scan(final String filename, final InputStream inputStream);
}

To implement a reactive engine, the easy way is maybe to use Vertx with Mutiny.
But we can also use Vertx or native JAVA API with CompletionStage.

[melloware]

@ggrebert PR is welcome. This is still a BETA library only at 0.0.4 so I am not worried about breaking changes.