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   /*
    * Copyright 2013 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:
    *
    *   http://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.buffer;
  
  import io.netty.util.ResourceLeakDetector;
  import io.netty.util.ResourceLeakTracker;
  import io.netty.util.internal.ObjectUtil;
  
  import java.nio.ByteOrder;
  
  class SimpleLeakAwareByteBuf extends WrappedByteBuf {
  
      /**
       * This object's is associated with the {@link ResourceLeakTracker}. When {@link ResourceLeakTracker#close(Object)}
       * is called this object will be used as the argument. It is also assumed that this object is used when
       * {@link ResourceLeakDetector#track(Object)} is called to create {@link #leak}.
       */
      private final ByteBuf trackedByteBuf;
      final ResourceLeakTracker<ByteBuf> leak;
  
      SimpleLeakAwareByteBuf(ByteBuf wrapped, ByteBuf trackedByteBuf, ResourceLeakTracker<ByteBuf> leak) {
          super(wrapped);
          this.trackedByteBuf = ObjectUtil.checkNotNull(trackedByteBuf, "trackedByteBuf");
          this.leak = ObjectUtil.checkNotNull(leak, "leak");
      }
  
      SimpleLeakAwareByteBuf(ByteBuf wrapped, ResourceLeakTracker<ByteBuf> leak) {
          this(wrapped, wrapped, leak);
      }
  
      @Override
      public ByteBuf slice() {
          return newSharedLeakAwareByteBuf(super.slice());
      }
  
      @Override
      public ByteBuf slice(int index, int length) {
          return newSharedLeakAwareByteBuf(super.slice(index, length));
      }
  
      @Override
      public ByteBuf duplicate() {
          return newSharedLeakAwareByteBuf(super.duplicate());
      }
  
      @Override
      public ByteBuf readSlice(int length) {
          return newSharedLeakAwareByteBuf(super.readSlice(length));
      }
  
      @Override
      public boolean release() {
          if (super.release()) {
              closeLeak();
              return true;
          }
          return false;
      }
  
      @Override
      public boolean release(int decrement) {
          if (super.release(decrement)) {
              closeLeak();
              return true;
          }
          return false;
      }
  
      private void closeLeak() {
          // Close the ResourceLeakTracker with the tracked ByteBuf as argument. This must be the same that was used when
          // calling DefaultResourceLeak.track(...).
          boolean closed = leak.close(trackedByteBuf);
          assert closed;
      }
  
      @Override
      public ByteBuf order(ByteOrder endianness) {
          if (order() == endianness) {
              return this;
          } else {
              return newSharedLeakAwareByteBuf(super.order(endianness));
          }
      }
  
      private SimpleLeakAwareByteBuf newSharedLeakAwareByteBuf(
             ByteBuf wrapped) {
         return newLeakAwareByteBuf(wrapped, trackedByteBuf, leak);
     }
 
     protected SimpleLeakAwareByteBuf newLeakAwareByteBuf(
             ByteBuf buf, ByteBuf trackedByteBuf, ResourceLeakTracker<ByteBuf> leakTracker) {
         return new SimpleLeakAwareByteBuf(buf, trackedByteBuf, leakTracker);
     }
 }