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.buffer.ByteBuf;
  import io.netty.channel.ChannelHandler;
  
  import static org.apache.cassandra.net.FrameEncoderCrc.HEADER_LENGTH;
  import static org.apache.cassandra.net.FrameEncoderCrc.writeHeader;
  
  /**
   * A frame encoder that writes frames, just without any modification or payload protection.
   * This is non-standard, and useful for systems that have a trusted transport layer that want
   * to avoid incurring the (very low) cost of computing a CRC.
   *
   * Please see {@link FrameDecoderUnprotected} for description of the framing produced by this encoder.
   */
  @ChannelHandler.Sharable
  class FrameEncoderUnprotected extends FrameEncoder
  {
      static final FrameEncoderUnprotected instance = new FrameEncoderUnprotected();
      static final PayloadAllocator allocator = (isSelfContained, capacity) ->
          new Payload(isSelfContained, capacity, HEADER_LENGTH, 0);
  
      public PayloadAllocator allocator()
      {
          return allocator;
      }
  
      ByteBuf encode(boolean isSelfContained, ByteBuffer frame)
      {
          try
          {
              int frameLength = frame.remaining();
              int dataLength = frameLength - HEADER_LENGTH;
              if (dataLength >= 1 << 17)
                  throw new IllegalArgumentException("Maximum uncompressed payload size is 128KiB");
  
              writeHeader(frame, isSelfContained, dataLength);
              return GlobalBufferPoolAllocator.wrap(frame);
          }
          catch (Throwable t)
          {
              bufferPool.put(frame);
              throw t;
          }
      }
  }
  