| /* |
| * 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.io.util; |
| |
| import java.io.File; |
| import java.nio.ByteBuffer; |
| import java.util.Optional; |
| |
| public class ChecksummedSequentialWriter extends SequentialWriter |
| { |
| private static final SequentialWriterOption CRC_WRITER_OPTION = SequentialWriterOption.newBuilder() |
| .bufferSize(8 * 1024) |
| .build(); |
| |
| private final SequentialWriter crcWriter; |
| private final ChecksumWriter crcMetadata; |
| private final Optional<File> digestFile; |
| |
| public ChecksummedSequentialWriter(File file, File crcPath, File digestFile, SequentialWriterOption option) |
| { |
| super(file, option); |
| crcWriter = new SequentialWriter(crcPath, CRC_WRITER_OPTION); |
| crcMetadata = new ChecksumWriter(crcWriter); |
| crcMetadata.writeChunkSize(buffer.capacity()); |
| this.digestFile = Optional.ofNullable(digestFile); |
| } |
| |
| @Override |
| protected void flushData() |
| { |
| super.flushData(); |
| ByteBuffer toAppend = buffer.duplicate(); |
| toAppend.position(0); |
| toAppend.limit(buffer.position()); |
| crcMetadata.appendDirect(toAppend, false); |
| } |
| |
| protected class TransactionalProxy extends SequentialWriter.TransactionalProxy |
| { |
| @Override |
| protected Throwable doCommit(Throwable accumulate) |
| { |
| return super.doCommit(crcWriter.commit(accumulate)); |
| } |
| |
| @Override |
| protected Throwable doAbort(Throwable accumulate) |
| { |
| return super.doAbort(crcWriter.abort(accumulate)); |
| } |
| |
| @Override |
| protected void doPrepare() |
| { |
| syncInternal(); |
| digestFile.ifPresent(crcMetadata::writeFullChecksum); |
| crcWriter.prepareToCommit(); |
| } |
| } |
| |
| @Override |
| protected SequentialWriter.TransactionalProxy txnProxy() |
| { |
| return new TransactionalProxy(); |
| } |
| } |