org.apache.cassandra.io.util.ChecksummedSequentialWriter Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one
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* 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 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();
}
}