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.net;
  
  import java.nio.ByteBuffer;
  
  import io.netty.channel.EventLoop;
  import org.apache.cassandra.utils.memory.BufferPool;
  import org.apache.cassandra.utils.memory.BufferPools;
  
  /**
   * Equivalent to {@link GlobalBufferPoolAllocator}, except explicitly using a specified
   * {@link org.apache.cassandra.utils.memory.BufferPool.LocalPool} to allocate from.
   *
   * Exists to facilitate more efficient handling large messages on the inbound path,
   * used by {@link ConnectionType#LARGE_MESSAGES} connections.
   */
  class LocalBufferPoolAllocator extends BufferPoolAllocator
  {
      private final BufferPool.LocalPool pool;
      private final EventLoop eventLoop;
  
      LocalBufferPoolAllocator(EventLoop eventLoop)
      {
          this.pool = BufferPools.forNetworking().create().recycleWhenFree(false);
          this.eventLoop = eventLoop;
      }
  
      @Override
      ByteBuffer get(int size)
      {
          if (!eventLoop.inEventLoop())
              throw new IllegalStateException("get() called from outside of owning event loop");
          return pool.get(size);
      }
  
      @Override
      ByteBuffer getAtLeast(int size)
      {
          if (!eventLoop.inEventLoop())
              throw new IllegalStateException("getAtLeast() called from outside of owning event loop");
          return pool.getAtLeast(size);
      }
  
      @Override
      public void release()
      {
          pool.release();
      }
  }
  