Zstd Class — netty Architecture

Source Code

codec-compression/src/main/java/io/netty/handler/codec/compression/Zstd.java lines 23–81

public final class Zstd {

    private static final InternalLogger logger = InternalLoggerFactory.getInstance(Zstd.class);
    private static final Throwable cause;

    static {
        Throwable t = null;

        try {
            Class.forName("com.github.luben.zstd.Zstd", false,
                PlatformDependent.getClassLoader(Zstd.class));
        } catch (ClassNotFoundException e) {
            t = e;
            logger.debug(
                "zstd-jni not in the classpath; Zstd support will be unavailable.");
        }

        // If in the classpath, try to load the native library and initialize zstd.
        if (t == null) {
            try {
                com.github.luben.zstd.util.Native.load();
            } catch (Throwable e) {
                t = e;
                logger.debug("Failed to load zstd-jni; Zstd support will be unavailable.", t);
            }
        }
        cause = t;
    }

    /**
     *
     * @return true when zstd-jni is in the classpath
     * and native library is available on this platform and could be loaded
     */
    public static boolean isAvailable() {
        return cause == null;
    }

    /**
     * Throws when zstd support is missing from the classpath or is unavailable on this platform
     * @throws Throwable a ClassNotFoundException if zstd-jni is missing
     * or a ExceptionInInitializerError if zstd native lib can't be loaded
     */
    public static void ensureAvailability() throws Throwable {
        if (cause != null) {
            throw cause;
        }
    }

    /**
     * Returns {@link Throwable} of unavailability cause
     */
    public static Throwable cause() {
        return cause;
    }

    private Zstd() {
    }
}