Java Code Examples for sun.misc.Unsafe#getObject()

/**
 * Returns a new group with the system ThreadGroup (the
 * topmost, parent-less group) as parent.  Uses Unsafe to
 * traverse Thread.group and ThreadGroup.parent fields.
 */
private static ThreadGroup createThreadGroup() {
    try {
        final Field f = Unsafe.class.getDeclaredField ("theUnsafe");
        f.setAccessible (true);
        Unsafe u = (Unsafe) f.get (null);
        Class<?> tk = Thread.class;
        Class<?> gk = ThreadGroup.class;
        long tg = u.objectFieldOffset(tk.getDeclaredField("group"));
        long gp = u.objectFieldOffset(gk.getDeclaredField("parent"));
        ThreadGroup group = (ThreadGroup)
            u.getObject(Thread.currentThread(), tg);
        while (group != null) {
            ThreadGroup parent = (ThreadGroup)u.getObject(group, gp);
            if (parent == null)
                return new ThreadGroup(group,
                                       "InnocuousForkJoinWorkerThreadGroup");
            group = parent;
        }
    } catch (Exception e) {
        throw new Error(e);
    }
    // fall through if null as cannot-happen safeguard
    throw new Error("Cannot create ThreadGroup");
}
 

static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

@SuppressWarnings("all")
public static Object[] unsafePutObject(Unsafe unsafe, Object obj, long offset, Object value1, Object value2, Object value3) {
    Object[] res = new Object[3];
    unsafe.putObject(obj, offset, value1);
    res[0] = unsafe.getObject(obj, offset);
    unsafe.putObjectVolatile(obj, offset, value2);
    res[1] = unsafe.getObject(obj, offset);
    unsafe.putOrderedObject(obj, offset, value3);
    res[2] = unsafe.getObject(obj, offset);
    return res;
}
 

static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

public static Object testUnsafeLoad(Unsafe theUnsafe, Object a, Object b, Object c) throws Exception {
    final int offset = (c == null ? 0 : ((Integer) c).intValue());
    final long displacement = (b == null ? 0 : ((Long) b).longValue());
    return theUnsafe.getObject(a, offset + displacement);
}
 

static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef2(Unsafe unsafe, Reference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef4(Unsafe unsafe, Test7190310_unsafe ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef3(Unsafe unsafe, Object ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

static Object getRef1(Unsafe unsafe, WeakReference ref, long referent_offset) throws Exception {
  return unsafe.getObject(ref, referent_offset);
}
 

public static Object getBeanValue(Object bean, String fieldName) {
    if (bean == null || fieldName == null) {
        return null;
    }
    Class<?> clazz = bean.getClass();

    Map<String, Field> fieldMap = getBeanFieldMap(clazz);
    Field field = fieldMap.get(fieldName);
    Unsafe unsafe = getUnsafeInstance();
    if (unsafe == null) {
        try {
            if (!field.isAccessible()) {
                field.setAccessible(true);
            }
            return field.get(bean);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }

    long offset = getBeanFieldOffset(clazz, fieldName);
    if (offset == -1) {
        return null;
    }

    Class<?> type = field.getType();
    if (type == boolean.class) {
        return unsafe.getBoolean(bean, offset);
    } else if (type == byte.class) {
        return unsafe.getByte(bean, offset);
    } else if (type == short.class) {
        return unsafe.getShort(bean, offset);
    } else if (type == char.class) {
        return unsafe.getChar(bean, offset);
    } else if (type == int.class) {
        return unsafe.getInt(bean, offset);
    } else if (type == long.class) {
        return unsafe.getLong(bean, offset);
    } else if (type == float.class) {
        return unsafe.getFloat(bean, offset);
    } else if (type == double.class) {
        return unsafe.getDouble(bean, offset);
    }
    return unsafe.getObject(bean, offset);

}