private static boolean checkAvailable()

in hbase-unsafe/src/main/java/org/apache/hadoop/hbase/unsafe/HBasePlatformDependent.java [52:160]
107 lines of code
21 McCabe index (conditional complexity)

  private static boolean checkAvailable() {
    try {
      Class<?> clazz = Class.forName(CLASS_NAME);
      Field f = clazz.getDeclaredField("theUnsafe");
      f.setAccessible(true);
      Object theUnsafe = f.get(null);
      if (theUnsafe == null) {
        LOG.warn("Could not get static instance from sun.misc.Unsafe");
        return false;
      }
      // Check for availability of all methods used by UnsafeAccess
      Method m;
      try {
        m = clazz.getDeclaredMethod("arrayBaseOffset", Class.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing arrayBaseOffset(Class)");
          return false;
        }
        m = clazz.getDeclaredMethod("copyMemory", Object.class, long.class, Object.class,
          long.class, long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing copyMemory(Object,long,Object,long,long)");
          return false;
        }
        m = clazz.getDeclaredMethod("getByte", Object.class, long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing getByte(Object,long)");
          return false;
        }
        m = clazz.getDeclaredMethod("getShort", long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing getShort(long)");
          return false;
        }
        m = clazz.getDeclaredMethod("getShort", Object.class, long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing getShort(Object,long)");
          return false;
        }
        m = clazz.getDeclaredMethod("getInt", long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing getInt(long)");
          return false;
        }
        m = clazz.getDeclaredMethod("getInt", Object.class, long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing getInt(Object,long)");
          return false;
        }
        m = clazz.getDeclaredMethod("getLong", long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing getLong(long)");
          return false;
        }
        m = clazz.getDeclaredMethod("getLong", Object.class, long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing getLong(Object,long)");
          return false;
        }
        m = clazz.getDeclaredMethod("putByte", long.class, byte.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putByte(long,byte)");
          return false;
        }
        m = clazz.getDeclaredMethod("putByte", Object.class, long.class, byte.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putByte(Object,long,byte)");
          return false;
        }
        m = clazz.getDeclaredMethod("putShort", long.class, short.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putShort(long,short)");
          return false;
        }
        m = clazz.getDeclaredMethod("putShort", Object.class, long.class, short.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putShort(Object,long,short)");
          return false;
        }
        m = clazz.getDeclaredMethod("putInt", long.class, int.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putInt(long,int)");
          return false;
        }
        m = clazz.getDeclaredMethod("putInt", Object.class, long.class, int.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putInt(Object,long,int)");
          return false;
        }
        m = clazz.getDeclaredMethod("putLong", long.class, long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putLong(long,long)");
          return false;
        }
        m = clazz.getDeclaredMethod("putLong", Object.class, long.class, long.class);
        if (m == null) {
          LOG.warn("sun.misc.Unsafe is missing putLong(Object,long,long)");
          return false;
        }
        // theUnsafe is accessible and all methods are available
        return true;
      } catch (Throwable e) {
        LOG.warn("sun.misc.Unsafe is missing one or more required methods", e);
      }
    } catch (Throwable e) {
      LOG.warn("sun.misc.Unsafe is not available/accessible", e);
    }
    return false;
  }