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;
  
  import org.apache.arrow.memory.util.MemoryUtil;
  
  /**
   * The default Allocation Manager Factory for a module.
   *
   * <p>This is only used by tests and contains only a simplistic allocator method.
   */
  public class DefaultAllocationManagerFactory implements AllocationManager.Factory {
  
    public static final AllocationManager.Factory FACTORY = new DefaultAllocationManagerFactory();
    private static final ArrowBuf EMPTY =
        new ArrowBuf(ReferenceManager.NO_OP, null, 0, MemoryUtil.allocateMemory(0));
  
    @Override
    public AllocationManager create(BufferAllocator accountingAllocator, long size) {
      return new AllocationManager(accountingAllocator) {
        private final long allocatedSize = size;
        private final long address = MemoryUtil.allocateMemory(size);
  
        @Override
        public long getSize() {
          return allocatedSize;
        }
  
        @Override
        protected long memoryAddress() {
          return address;
        }
  
        @Override
        protected void release0() {
          MemoryUtil.freeMemory(address);
        }
      };
    }
  
    @Override
    public ArrowBuf empty() {
      return EMPTY;
    }
  }
  