/*
    * Copyright 2025 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.util.internal;
  
  import io.netty.util.ReferenceCounted;
  import java.lang.invoke.VarHandle;
  
  public abstract class VarHandleReferenceCountUpdater<T extends ReferenceCounted>
          extends ReferenceCountUpdater<T> {
  
      protected VarHandleReferenceCountUpdater() {
      }
  
      protected abstract VarHandle varHandle();
  
      @Override
      protected final void safeInitializeRawRefCnt(T refCntObj, int value) {
          varHandle().set(refCntObj, value);
      }
  
      @Override
      protected final int getAndAddRawRefCnt(T refCntObj, int increment) {
          return (int) varHandle().getAndAdd(refCntObj, increment);
      }
  
      @Override
      protected final int getRawRefCnt(T refCnt) {
          return (int) varHandle().get(refCnt);
      }
  
      @Override
      protected final int getAcquireRawRefCnt(T refCnt) {
          return (int) varHandle().getAcquire(refCnt);
      }
  
      @Override
      protected final void setReleaseRawRefCnt(T refCnt, int value) {
          varHandle().setRelease(refCnt, value);
      }
  
      @Override
      protected final boolean casRawRefCnt(T refCnt, int expected, int value) {
          return varHandle().compareAndSet(refCnt, expected, value);
      }
  }