| /* |
| * 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.io.IOException; |
| import java.util.zip.Adler32; |
| |
| import org.apache.cassandra.io.compress.BufferType; |
| import org.apache.cassandra.utils.ByteBufferUtil; |
| |
| public class ChecksummedRandomAccessReader extends RandomAccessReader |
| { |
| @SuppressWarnings("serial") |
| public static class CorruptFileException extends RuntimeException |
| { |
| public final File file; |
| |
| public CorruptFileException(Exception cause, File file) |
| { |
| super(cause); |
| this.file = file; |
| } |
| } |
| |
| private final DataIntegrityMetadata.ChecksumValidator validator; |
| private final File file; |
| |
| protected ChecksummedRandomAccessReader(File file, ChannelProxy channel, DataIntegrityMetadata.ChecksumValidator validator) |
| { |
| super(channel, validator.chunkSize, -1, BufferType.ON_HEAP, null); |
| this.validator = validator; |
| this.file = file; |
| } |
| |
| @SuppressWarnings("resource") |
| public static ChecksummedRandomAccessReader open(File file, File crcFile) throws IOException |
| { |
| try (ChannelProxy channel = new ChannelProxy(file)) |
| { |
| RandomAccessReader crcReader = RandomAccessReader.open(crcFile); |
| boolean closeCrcReader = true; |
| try |
| { |
| DataIntegrityMetadata.ChecksumValidator validator = |
| new DataIntegrityMetadata.ChecksumValidator(new Adler32(), crcReader, file.getPath()); |
| closeCrcReader = false; |
| boolean closeValidator = true; |
| try |
| { |
| ChecksummedRandomAccessReader retval = new ChecksummedRandomAccessReader(file, channel, validator); |
| closeValidator = false; |
| return retval; |
| } |
| finally |
| { |
| if (closeValidator) |
| validator.close(); |
| } |
| } |
| finally |
| { |
| if (closeCrcReader) |
| crcReader.close(); |
| } |
| } |
| } |
| |
| @Override |
| protected void reBuffer() |
| { |
| long desiredPosition = current(); |
| // align with buffer size, as checksums were computed in chunks of buffer size each. |
| bufferOffset = (desiredPosition / buffer.capacity()) * buffer.capacity(); |
| |
| buffer.clear(); |
| |
| long position = bufferOffset; |
| while (buffer.hasRemaining()) |
| { |
| int n = channel.read(buffer, position); |
| if (n < 0) |
| break; |
| position += n; |
| } |
| |
| buffer.flip(); |
| |
| try |
| { |
| validator.validate(ByteBufferUtil.getArray(buffer), 0, buffer.remaining()); |
| } |
| catch (IOException e) |
| { |
| throw new CorruptFileException(e, file); |
| } |
| |
| buffer.position((int) (desiredPosition - bufferOffset)); |
| } |
| |
| @Override |
| public void seek(long newPosition) |
| { |
| validator.seek(newPosition); |
| super.seek(newPosition); |
| } |
| |
| @Override |
| public void close() |
| { |
| super.close(); |
| validator.close(); |
| } |
| } |