test/jdk/javax/sound/sampled/AudioSystem/ProviderCacheing.java

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import java.util.List;
import com.sun.media.sound.JDK13Services;

/**
 * @test
 * @bug 4776511
 * @summary RFE: Setting the default MixerProvider. Test the cacheing of
 *          providers.
 * @modules java.desktop/com.sun.media.sound
 */
public class ProviderCacheing {

    private static final Class[] providerClasses = {
        javax.sound.sampled.spi.AudioFileReader.class,
        javax.sound.sampled.spi.AudioFileWriter.class,
        javax.sound.sampled.spi.FormatConversionProvider.class,
        javax.sound.sampled.spi.MixerProvider.class,
    };

    public static void main(String[] args) throws Exception {
        boolean allCached = true;
        for (int i = 0; i < providerClasses.length; i++) {
            List list0 = JDK13Services.getProviders(providerClasses[i]);
            List list1 = JDK13Services.getProviders(providerClasses[i]);
            if (list0 == list1) {
                out("Providers should not be cached for " + providerClasses[i]);
                allCached = false;
            }
        }

        if (! allCached) {
            throw new Exception("Test failed");
        } else {
            out("Test passed");
        }
    }

    private static void out(String message) {
        System.out.println(message);
    }
}