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.bookkeeper.common.allocator;
  
  /**
   * Define a policy for allocating buffers.
   */
  public enum PoolingPolicy {
  
      /**
       * Allocate memory from JVM heap without any pooling.
       *
       * <p>This option has the least overhead in terms of memory usage since the
       * memory will be automatically reclaimed by the JVM GC but might impose a
       * performance penalty at high throughput.
       */
      UnpooledHeap,
  
      /**
       * Use Direct memory for all buffers and pool the memory.
       *
       * <p>Direct memory will avoid the overhead of JVM GC and most memory copies
       * when reading and writing to socket channel.
       *
       * <p>Pooling will add memory space overhead due to the fact that there will be
       * fragmentation in the allocator and that threads will keep a portion of
       * memory as thread-local to avoid contention when possible.
       */
      PooledDirect
  }
  