Package io.netty.util.internal

Class NativeLibraryLoader

  • public final class NativeLibraryLoader
extends java.lang.Object
    Helper class to load JNI resources.

    • Constructor Summary

      Constructors 
      Modifier Constructor Description
      private NativeLibraryLoader()  

    • Method Summary

      All Methods Static Methods Concrete Methods 
      Modifier and Type Method Description
      private static java.lang.String calculateMangledPackagePrefix()
      Calculates the mangled shading prefix added to this class's full name.
      private static byte[] classToByteArray​(java.lang.Class<?> clazz)
      Load the helper Class as a byte array, to be redefined in specified ClassLoader.
      private static void closeQuietly​(java.io.Closeable c)  
      private static byte[] digest​(java.security.MessageDigest digest, java.net.URL url)  
      private static byte[] generateUniqueId​(int length)  
      private static java.net.URL getResource​(java.lang.String path, java.lang.ClassLoader loader)  
      static void load​(java.lang.String originalName, java.lang.ClassLoader loader)
      Load the given library with the specified ClassLoader
      static void loadFirstAvailable​(java.lang.ClassLoader loader, java.lang.String... names)
      Loads the first available library in the collection with the specified ClassLoader.
      private static void loadLibrary​(java.lang.ClassLoader loader, java.lang.String name, boolean absolute)
      Loading the native library into the specified ClassLoader.
      private static void loadLibraryByHelper​(java.lang.Class<?> helper, java.lang.String name, boolean absolute)  
      private static void rethrowWithMoreDetailsIfPossible​(java.lang.String name, java.lang.NoSuchMethodError error)  
      private static boolean shouldShadedLibraryIdBePatched​(java.lang.String packagePrefix)  
      private static boolean tryExec​(java.lang.String cmd)  
      (package private) static void tryPatchShadedLibraryIdAndSign​(java.io.File libraryFile, java.lang.String originalName)  
      private static java.lang.Class<?> tryToLoadClass​(java.lang.ClassLoader loader, java.lang.Class<?> helper)
      Try to load the helper Class into specified ClassLoader.

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Field Detail

      • NATIVE_RESOURCE_HOME

        private static final java.lang.String NATIVE_RESOURCE_HOME
        See Also:
        Constant Field Values

      • WORKDIR

        private static final java.io.File WORKDIR

      • DELETE_NATIVE_LIB_AFTER_LOADING

        private static final boolean DELETE_NATIVE_LIB_AFTER_LOADING

      • TRY_TO_PATCH_SHADED_ID

        private static final boolean TRY_TO_PATCH_SHADED_ID

      • DETECT_NATIVE_LIBRARY_DUPLICATES

        private static final boolean DETECT_NATIVE_LIBRARY_DUPLICATES

      • UNIQUE_ID_BYTES

        private static final byte[] UNIQUE_ID_BYTES

    • Constructor Detail

      • NativeLibraryLoader

        private NativeLibraryLoader()

    • Method Detail

      • loadFirstAvailable

        public static void loadFirstAvailable​(java.lang.ClassLoader loader,
                                      java.lang.String... names)
        Loads the first available library in the collection with the specified ClassLoader.
        Throws:
        java.lang.IllegalArgumentException - if none of the given libraries load successfully.

      • calculateMangledPackagePrefix

        private static java.lang.String calculateMangledPackagePrefix()
        Calculates the mangled shading prefix added to this class's full name.

        This method mangles the package name as follows, so we can unmangle it back later:

        • _ to _1
        • . to _

        Note that we don't mangle non-ASCII characters here because it's extremely unlikely to have a non-ASCII character in a package name. For more information, see:

        Throws:
        java.lang.UnsatisfiedLinkError - if the shader used something other than a prefix

      • load

        public static void load​(java.lang.String originalName,
                        java.lang.ClassLoader loader)
        Load the given library with the specified ClassLoader

      • getResource

        private static java.net.URL getResource​(java.lang.String path,
                                        java.lang.ClassLoader loader)

      • digest

        private static byte[] digest​(java.security.MessageDigest digest,
                             java.net.URL url)

      • tryPatchShadedLibraryIdAndSign

        static void tryPatchShadedLibraryIdAndSign​(java.io.File libraryFile,
                                           java.lang.String originalName)

      • tryExec

        private static boolean tryExec​(java.lang.String cmd)

      • shouldShadedLibraryIdBePatched

        private static boolean shouldShadedLibraryIdBePatched​(java.lang.String packagePrefix)

      • generateUniqueId

        private static byte[] generateUniqueId​(int length)

      • loadLibrary

        private static void loadLibrary​(java.lang.ClassLoader loader,
                                java.lang.String name,
                                boolean absolute)
        Loading the native library into the specified ClassLoader.
        Parameters:
        loader - - The ClassLoader where the native library will be loaded into
        name - - The native library path or name
        absolute - - Whether the native library will be loaded by path or by name

      • rethrowWithMoreDetailsIfPossible

        private static void rethrowWithMoreDetailsIfPossible​(java.lang.String name,
                                                     java.lang.NoSuchMethodError error)

      • loadLibraryByHelper

        private static void loadLibraryByHelper​(java.lang.Class<?> helper,
                                        java.lang.String name,
                                        boolean absolute)
                                 throws java.lang.UnsatisfiedLinkError
        Throws:
        java.lang.UnsatisfiedLinkError

      • tryToLoadClass

        private static java.lang.Class<?> tryToLoadClass​(java.lang.ClassLoader loader,
                                                 java.lang.Class<?> helper)
                                          throws java.lang.ClassNotFoundException
        Try to load the helper Class into specified ClassLoader.
        Parameters:
        loader - - The ClassLoader where to load the helper Class
        helper - - The helper Class
        Returns:
        A new helper Class defined in the specified ClassLoader.
        Throws:
        java.lang.ClassNotFoundException - Helper class not found or loading failed

      • classToByteArray

        private static byte[] classToByteArray​(java.lang.Class<?> clazz)
                                throws java.lang.ClassNotFoundException
        Load the helper Class as a byte array, to be redefined in specified ClassLoader.
        Parameters:
        clazz - - The helper Class provided by this bundle
        Returns:
        The binary content of helper Class.
        Throws:
        java.lang.ClassNotFoundException - Helper class not found or loading failed

      • closeQuietly

        private static void closeQuietly​(java.io.Closeable c)