| /* |
| * 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 java.nio.ByteOrder; |
| import java.util.zip.CRC32; |
| |
| import io.netty.buffer.ByteBuf; |
| import io.netty.channel.ChannelHandler; |
| |
| import static org.apache.cassandra.net.Crc.*; |
| |
| /** |
| * Please see {@link FrameDecoderCrc} for description of the framing produced by this encoder. |
| */ |
| @ChannelHandler.Sharable |
| public class FrameEncoderCrc extends FrameEncoder |
| { |
| static final int HEADER_LENGTH = 6; |
| private static final int TRAILER_LENGTH = 4; |
| public static final int HEADER_AND_TRAILER_LENGTH = 10; |
| |
| public static final FrameEncoderCrc instance = new FrameEncoderCrc(); |
| static final PayloadAllocator allocator = (isSelfContained, capacity) -> |
| new Payload(isSelfContained, capacity, HEADER_LENGTH, TRAILER_LENGTH); |
| |
| public PayloadAllocator allocator() |
| { |
| return allocator; |
| } |
| |
| static void writeHeader(ByteBuffer frame, boolean isSelfContained, int dataLength) |
| { |
| int header3b = dataLength; |
| if (isSelfContained) |
| header3b |= 1 << 17; |
| int crc = crc24(header3b, 3); |
| put3b(frame, 0, header3b); |
| put3b(frame, 3, crc); |
| } |
| |
| private static void put3b(ByteBuffer frame, int index, int put3b) |
| { |
| frame.put(index , (byte) put3b ); |
| frame.put(index + 1, (byte)(put3b >>> 8) ); |
| frame.put(index + 2, (byte)(put3b >>> 16)); |
| } |
| |
| ByteBuf encode(boolean isSelfContained, ByteBuffer frame) |
| { |
| try |
| { |
| int frameLength = frame.remaining(); |
| int dataLength = frameLength - HEADER_AND_TRAILER_LENGTH; |
| if (dataLength >= 1 << 17) |
| throw new IllegalArgumentException("Maximum payload size is 128KiB"); |
| |
| writeHeader(frame, isSelfContained, dataLength); |
| |
| CRC32 crc = crc32(); |
| frame.position(HEADER_LENGTH); |
| frame.limit(dataLength + HEADER_LENGTH); |
| crc.update(frame); |
| |
| int frameCrc = (int) crc.getValue(); |
| if (frame.order() == ByteOrder.BIG_ENDIAN) |
| frameCrc = Integer.reverseBytes(frameCrc); |
| |
| frame.limit(frameLength); |
| frame.putInt(frameLength - TRAILER_LENGTH, frameCrc); |
| frame.position(0); |
| |
| return GlobalBufferPoolAllocator.wrap(frame); |
| } |
| catch (Throwable t) |
| { |
| bufferPool.put(frame); |
| throw t; |
| } |
| } |
| } |