Java Lz4Codec类代码示例

import org.apache.hadoop.io.compress.Lz4Codec; //导入依赖的package包/类
@Test
public void testNativeCodeLoaded() {
  if (requireTestJni() == false) {
    LOG.info("TestNativeCodeLoader: libhadoop.so testing is not required.");
    return;
  }
  if (!NativeCodeLoader.isNativeCodeLoaded()) {
    fail("TestNativeCodeLoader: libhadoop.so testing was required, but " +
        "libhadoop.so was not loaded.");
  }
  assertFalse(NativeCodeLoader.getLibraryName().isEmpty());
  // library names are depended on platform and build envs
  // so just check names are available
  assertFalse(ZlibFactory.getLibraryName().isEmpty());
  if (NativeCodeLoader.buildSupportsSnappy()) {
    assertFalse(SnappyCodec.getLibraryName().isEmpty());
  }
  if (NativeCodeLoader.buildSupportsOpenssl()) {
    assertFalse(OpensslCipher.getLibraryName().isEmpty());
  }
  assertFalse(Lz4Codec.getLibraryName().isEmpty());
  LOG.info("TestNativeCodeLoader: libhadoop.so is loaded.");
}
 

import org.apache.hadoop.io.compress.Lz4Codec; //导入依赖的package包/类
@Test
public void testNativeCodeLoaded() {
  if (requireTestJni() == false) {
    LOG.info("TestNativeCodeLoader: libhadoop.so testing is not required.");
    return;
  }
  if (!NativeCodeLoader.isNativeCodeLoaded()) {
    fail("TestNativeCodeLoader: libhadoop.so testing was required, but " +
        "libhadoop.so was not loaded.");
  }
  assertFalse(NativeCodeLoader.getLibraryName().isEmpty());
  // library names are depended on platform and build envs
  // so just check names are available
  assertFalse(ZlibFactory.getLibraryName().isEmpty());
  if (NativeCodeLoader.buildSupportsSnappy()) {
    assertFalse(SnappyCodec.getLibraryName().isEmpty());
  }
  assertFalse(Lz4Codec.getLibraryName().isEmpty());
  LOG.info("TestNativeCodeLoader: libhadoop.so is loaded.");
}
 

import org.apache.hadoop.io.compress.Lz4Codec; //导入依赖的package包/类
/**
 * Used for returning the compression kind used in ORC
 * 
 * @param codec
 * @return
 */
private CompressionKind resolveCompression(CompressionCodec codec) {
    if (codec instanceof Lz4Codec)
        return CompressionKind.LZ4;
    else if (codec instanceof SnappyCodec)
        return CompressionKind.SNAPPY;
    else if (codec instanceof ZlibCodec)
        return CompressionKind.ZLIB;
    else
        return CompressionKind.NONE;
}
 

import org.apache.hadoop.io.compress.Lz4Codec; //导入依赖的package包/类
@Before
public void before() {
  assumeTrue(Lz4Codec.isNativeCodeLoaded());
}
 

import org.apache.hadoop.io.compress.Lz4Codec; //导入依赖的package包/类
/**
 * A tool to test native library availability, 
 */
public static void main(String[] args) {
  String usage = "NativeLibraryChecker [-a|-h]\n"
      + "  -a  use -a to check all libraries are available\n"
      + "      by default just check hadoop library is available\n"
      + "      exit with error code 1 if check failed\n"
      + "  -h  print this message\n";
  if (args.length > 1 ||
      (args.length == 1 &&
          !(args[0].equals("-a") || args[0].equals("-h")))) {
    System.err.println(usage);
    ExitUtil.terminate(1);
  }
  boolean checkAll = false;
  if (args.length == 1) {
    if (args[0].equals("-h")) {
      System.out.println(usage);
      return;
    }
    checkAll = true;
  }
  Configuration conf = new Configuration();
  boolean nativeHadoopLoaded = NativeCodeLoader.isNativeCodeLoaded();
  boolean zlibLoaded = false;
  boolean snappyLoaded = false;
  // lz4 is linked within libhadoop
  boolean lz4Loaded = nativeHadoopLoaded;
  boolean bzip2Loaded = Bzip2Factory.isNativeBzip2Loaded(conf);
  String hadoopLibraryName = "";
  String zlibLibraryName = "";
  String snappyLibraryName = "";
  String lz4LibraryName = "";
  String bzip2LibraryName = "";
  if (nativeHadoopLoaded) {
    hadoopLibraryName = NativeCodeLoader.getLibraryName();
    zlibLoaded = ZlibFactory.isNativeZlibLoaded(conf);
    if (zlibLoaded) {
      zlibLibraryName = ZlibFactory.getLibraryName();
    }
    snappyLoaded = NativeCodeLoader.buildSupportsSnappy() &&
        SnappyCodec.isNativeCodeLoaded();
    if (snappyLoaded && NativeCodeLoader.buildSupportsSnappy()) {
      snappyLibraryName = SnappyCodec.getLibraryName();
    }
    if (lz4Loaded) {
      lz4LibraryName = Lz4Codec.getLibraryName();
    }
    if (bzip2Loaded) {
      bzip2LibraryName = Bzip2Factory.getLibraryName(conf);
    }
  }
  System.out.println("Native library checking:");
  System.out.printf("hadoop: %b %s\n", nativeHadoopLoaded, hadoopLibraryName);
  System.out.printf("zlib:   %b %s\n", zlibLoaded, zlibLibraryName);
  System.out.printf("snappy: %b %s\n", snappyLoaded, snappyLibraryName);
  System.out.printf("lz4:    %b %s\n", lz4Loaded, lz4LibraryName);
  System.out.printf("bzip2:  %b %s\n", bzip2Loaded, bzip2LibraryName);
  if ((!nativeHadoopLoaded) ||
      (checkAll && !(zlibLoaded && snappyLoaded && lz4Loaded && bzip2Loaded))) {
    // return 1 to indicated check failed
    ExitUtil.terminate(1);
  }
}