test/jdk/java/nio/file/WatchService/SensitivityModifier.java

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/* @test
 * @bug 4313887 8303413
 * @summary Sanity test for JDK-specific sensitivity level watch event modifier
 * @modules jdk.unsupported
 * @library .. /test/lib
 * @build jdk.test.lib.RandomFactory
 * @run main/timeout=240 SensitivityModifier
 * @key randomness
 */

import java.nio.file.FileSystem;
import java.nio.file.Path;
import java.nio.file.WatchEvent;
import java.nio.file.WatchKey;
import java.nio.file.WatchService;
import static java.nio.file.StandardWatchEventKinds.*;
import java.io.IOException;
import java.util.Random;
import com.sun.nio.file.SensitivityWatchEventModifier;
import jdk.test.lib.RandomFactory;

public class SensitivityModifier {

    static final Random RAND = RandomFactory.getRandom();

    static WatchKey register(Path dir, WatchService watcher)
        throws IOException {
        SensitivityWatchEventModifier[] sensitivities =
            SensitivityWatchEventModifier.values();
        SensitivityWatchEventModifier sensitivity =
            sensitivities[RAND.nextInt(sensitivities.length)];
        return dir.register(watcher, new WatchEvent.Kind<?>[]{ ENTRY_MODIFY },
                            sensitivity);
    }

    @SuppressWarnings("unchecked")
    static void doTest(Path dir) throws Exception {
        FileSystem fs = dir.getFileSystem();
        try (WatchService watcher = fs.newWatchService()) {
            // register the directory (random sensitivity)
            WatchKey key = register(dir, watcher);

            // check validity
            if (!key.isValid())
                throw new RuntimeException("Registration is invalid");

            // cancel the registration
            key.cancel();
        }
    }

    public static void main(String[] args) throws Exception {
        Path dir = TestUtil.createTemporaryDirectory();
        try {
            doTest(dir);
        } finally {
            TestUtil.removeAll(dir);
        }
    }
}