content: /*
   * Licensed to the Apache Software Foundation (ASF) under one or more
   * contributor license agreements.  See the NOTICE file distributed with
   * this work for additional information regarding copyright ownership.
   * The ASF 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 org.apache.arrow.memory.unsafe;
  
  import org.apache.arrow.memory.AllocationManager;
  import org.apache.arrow.memory.ArrowBuf;
  import org.apache.arrow.memory.BufferAllocator;
  import org.apache.arrow.memory.ReferenceManager;
  import org.apache.arrow.memory.util.MemoryUtil;
  
  /** Allocation manager based on unsafe API. */
  public final class UnsafeAllocationManager extends AllocationManager {
  
    private static final ArrowBuf EMPTY =
        new ArrowBuf(ReferenceManager.NO_OP, null, 0, MemoryUtil.allocateMemory(0));
  
    public static final AllocationManager.Factory FACTORY =
        new Factory() {
          @Override
          public AllocationManager create(BufferAllocator accountingAllocator, long size) {
            return new UnsafeAllocationManager(accountingAllocator, size);
          }
  
          @Override
          public ArrowBuf empty() {
            return EMPTY;
          }
        };
  
    private final long allocatedSize;
  
    private final long allocatedAddress;
  
    UnsafeAllocationManager(BufferAllocator accountingAllocator, long requestedSize) {
      super(accountingAllocator);
      allocatedAddress = MemoryUtil.allocateMemory(requestedSize);
      allocatedSize = requestedSize;
    }
  
    @Override
    public long getSize() {
      return allocatedSize;
    }
  
    @Override
    protected long memoryAddress() {
      return allocatedAddress;
    }
  
    @Override
    protected void release0() {
      MemoryUtil.freeMemory(allocatedAddress);
    }
  }
  