Examples of sun.misc.Cleaner

sun.misc.Cleaner
General-purpose phantom-reference-based cleaners.
Cleaners are a lightweight and more robust alternative to finalization. They are lightweight because they are not created by the VM and thus do not require a JNI upcall to be created, and because their cleanup code is invoked directly by the reference-handler thread rather than by the finalizer thread. They are more robust because they use phantom references, the weakest type of reference object, thereby avoiding the nasty ordering problems inherent to finalization.
A cleaner tracks a referent object and encapsulates a thunk of arbitrary cleanup code. Some time after the GC detects that a cleaner's referent has become phantom-reachable, the reference-handler thread will run the cleaner. Cleaners may also be invoked directly; they are thread safe and ensure that they run their thunks at most once.
Cleaners are not a replacement for finalization. They should be used only when the cleanup code is extremely simple and straightforward. Nontrivial cleaners are inadvisable since they risk blocking the reference-handler thread and delaying further cleanup and finalization. @author Mark Reinhold

        b.put(data);
    }


    private void unmapBuffer(MappedByteBuffer b) {
        if(b!=null){
            Cleaner cleaner = ((sun.nio.ch.DirectBuffer) b).cleaner();
            if(cleaner!=null)
                cleaner.clean();
        }
    }

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    static void throwException(Throwable t) {
        UNSAFE.throwException(t);
    }


    static void freeDirectBuffer(ByteBuffer buffer) {
        Cleaner cleaner;
        try {
            cleaner = (Cleaner) getObject(buffer, CLEANER_FIELD_OFFSET);
            if (cleaner == null) {
                throw new IllegalArgumentException(
                        "attempted to deallocate the buffer which was allocated via JNIEnv->NewDirectByteBuffer()");
            }
            cleaner.clean();
        } catch (Throwable t) {
            // Nothing we can do here.
        }
    }

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    }


    return AccessController.doPrivileged(new PrivilegedAction<Object>() {
      public Object run() {
        try {
          Cleaner cleaner = ((DirectBuffer)buffer).cleaner();
          if (cleaner != null) cleaner.clean(); // Already cleaned otherwise
          return null;
        }
        catch (Exception e) {
          return buffer;
        }

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      final boolean toBeWrote) throws FileIOErrorException {
    try {
      if (toBeWrote) {
        if (byteBuffer.isDirect()) {
          ((MappedByteBuffer) byteBuffer).force();
          final Cleaner cleaner = ((sun.nio.ch.DirectBuffer) byteBuffer)
              .cleaner();
          if (cleaner != null) {
            cleaner.clean();
          }
        } else {
          writeByteBuffer(byteBuffer, index);
        }
      } else {
        if (byteBuffer.isDirect()) {
          final Cleaner cleaner = ((sun.nio.ch.DirectBuffer) byteBuffer)
              .cleaner();
          if (cleaner != null) {
            cleaner.clean();
          }
        }
      }
    } catch (Exception exception) {
      String fileSize;

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        }


    }


    private static void unmap(MappedByteBuffer bb) {
        Cleaner cl = ((DirectBuffer)bb).cleaner();
        if (cl != null)
            cl.clean();
    }

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        }


    }


    private static void unmap(MappedByteBuffer bb) {
        Cleaner cl = ((DirectBuffer)bb).cleaner();
        if (cl != null)
            cl.clean();
    }

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