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.rounding.DefaultRoundingPolicy;
  import org.apache.arrow.memory.rounding.RoundingPolicy;
  import org.apache.arrow.util.VisibleForTesting;
  
  /**
   * A root allocator for using direct memory for Arrow Vectors/Arrays. Supports creating a tree of
   * descendant child allocators to facilitate better instrumentation of memory allocations.
   */
  public class RootAllocator extends BaseAllocator {
  
    public RootAllocator() {
      this(AllocationListener.NOOP, Long.MAX_VALUE);
    }
  
    public RootAllocator(final long limit) {
      this(AllocationListener.NOOP, limit);
    }
  
    public RootAllocator(final AllocationListener listener, final long limit) {
      // todo fix DefaultRoundingPolicy when using Netty
      this(listener, limit, DefaultRoundingPolicy.DEFAULT_ROUNDING_POLICY);
    }
  
    /**
     * Constructor.
     *
     * @param listener the allocation listener
     * @param limit max allocation size in bytes
     * @param roundingPolicy the policy for rounding the buffer size
     */
    public RootAllocator(
        final AllocationListener listener, final long limit, RoundingPolicy roundingPolicy) {
      this(
          configBuilder()
              .listener(listener)
              .maxAllocation(limit)
              .roundingPolicy(roundingPolicy)
              .build());
    }
  
    public RootAllocator(Config config) {
      super(null, "ROOT", config);
    }
  
    /** Verify the accounting state of the allocation system. */
    @VisibleForTesting
    public void verify() {
      verifyAllocator();
    }
  }
  