| /* |
| * 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.hints; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.util.zip.CRC32; |
| |
| import org.apache.cassandra.io.compress.ICompressor; |
| |
| public class CompressedHintsWriter extends HintsWriter |
| { |
| // compressed and uncompressed size is stored at the beginning of each compressed block |
| static final int METADATA_SIZE = 8; |
| |
| private final ICompressor compressor; |
| |
| private volatile ByteBuffer compressionBuffer = null; |
| |
| public CompressedHintsWriter(File directory, HintsDescriptor descriptor, File file, FileChannel channel, int fd, CRC32 globalCRC) |
| { |
| super(directory, descriptor, file, channel, fd, globalCRC); |
| compressor = descriptor.createCompressor(); |
| assert compressor != null; |
| } |
| |
| protected void writeBuffer(ByteBuffer bb) throws IOException |
| { |
| int originalSize = bb.remaining(); |
| int estimatedSize = compressor.initialCompressedBufferLength(originalSize) + METADATA_SIZE; |
| |
| if (compressionBuffer == null || compressionBuffer.capacity() < estimatedSize) |
| { |
| compressionBuffer = compressor.preferredBufferType().allocate(estimatedSize); |
| } |
| compressionBuffer.clear(); |
| |
| compressionBuffer.position(METADATA_SIZE); |
| compressor.compress(bb, compressionBuffer); |
| int compressedSize = compressionBuffer.position() - METADATA_SIZE; |
| |
| compressionBuffer.rewind(); |
| compressionBuffer.putInt(originalSize); |
| compressionBuffer.putInt(compressedSize); |
| compressionBuffer.rewind(); |
| compressionBuffer.limit(compressedSize + METADATA_SIZE); |
| super.writeBuffer(compressionBuffer); |
| } |
| } |