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.cassandra.utils.memory;
  
  import java.nio.ByteBuffer;
  
  import com.google.common.annotations.VisibleForTesting;
  
  import org.apache.cassandra.utils.Shared;
  import org.apache.cassandra.utils.concurrent.OpOrder;
  
  import static org.apache.cassandra.utils.Shared.Scope.SIMULATION;
  
  
  public class HeapPool extends MemtablePool
  {
      public HeapPool(long maxOnHeapMemory, float cleanupThreshold, MemtableCleaner cleaner)
      {
          super(maxOnHeapMemory, 0, cleanupThreshold, cleaner);
      }
  
      public MemtableAllocator newAllocator(String table)
      {
          return new Allocator(this);
      }
  
      @VisibleForTesting
      public static class Allocator extends MemtableBufferAllocator
      {
          @VisibleForTesting
          public Allocator(HeapPool pool)
          {
              super(pool.onHeap.newAllocator(), pool.offHeap.newAllocator());
          }
  
          public ByteBuffer allocate(int size, OpOrder.Group opGroup)
          {
              super.onHeap().allocate(size, opGroup);
              return ByteBuffer.allocate(size);
          }
  
          public EnsureOnHeap ensureOnHeap()
          {
              return EnsureOnHeap.NOOP;
          }
  
          public Cloner cloner(OpOrder.Group opGroup)
          {
              return allocator(opGroup);
          }
      }
  
      public static class Logged extends MemtablePool
      {
          @Shared(scope = SIMULATION)
          public interface Listener
          {
              public void accept(long size, String table);
          }
  
          private static Listener onAllocated = (i, table) -> {};
  
          class LoggedSubPool extends SubPool
          {
              public LoggedSubPool(long limit, float cleanThreshold)
              {
                  super(limit, cleanThreshold);
              }
  
              public MemtableAllocator.SubAllocator newAllocator(String table)
              {
                  return new MemtableAllocator.SubAllocator(this)
                  {
                      public void allocate(long size, OpOrder.Group opGroup)
                      {
                          onAllocated.accept(size, table);
                          super.allocate(size, opGroup);
                      }
                  };
              }
          }
  
          public Logged(long maxOnHeapMemory, float cleanupThreshold, MemtableCleaner cleaner)
          {
              super(maxOnHeapMemory, 0, cleanupThreshold, cleaner);
          }
  
          public MemtableAllocator newAllocator(String table)
          {
              return new Allocator(this, table);
          }
  
          private static class Allocator extends MemtableBufferAllocator
          {
              Allocator(Logged pool, String table)
              {
                  super(((LoggedSubPool) pool.onHeap).newAllocator(table), ((LoggedSubPool) pool.offHeap).newAllocator(table));
              }
  
              public ByteBuffer allocate(int size, OpOrder.Group opGroup)
              {
                  super.onHeap().allocate(size, opGroup);
                  return ByteBuffer.allocate(size);
              }
  
              @Override
              public EnsureOnHeap ensureOnHeap()
              {
                  return EnsureOnHeap.NOOP;
              }
  
              public Cloner cloner(OpOrder.Group opGroup)
              {
                  return allocator(opGroup);
              }
          }
  
          SubPool getSubPool(long limit, float cleanThreshold)
          {
              return new LoggedSubPool(limit, cleanThreshold);
          }
  
          public static void setListener(Listener listener)
          {
              onAllocated = listener;
          }
      }
  }
  