Java DataIntegrityMetadata.checksumValidator方法代码示例

import org.apache.cassandra.io.util.DataIntegrityMetadata; //导入方法依赖的package包/类
/**
 * Stream file of specified sections to given channel.
 *
 * StreamWriter uses LZF compression on wire to decrease size to transfer.
 *
 * @param channel where this writes data to
 * @throws IOException on any I/O error
 */
public void write(WritableByteChannel channel) throws IOException
{
    long totalSize = totalSize();
    RandomAccessReader file = sstable.openDataReader();
    ChecksumValidator validator = new File(sstable.descriptor.filenameFor(Component.CRC)).exists()
                                ? DataIntegrityMetadata.checksumValidator(sstable.descriptor)
                                : null;
    transferBuffer = validator == null ? new byte[DEFAULT_CHUNK_SIZE] : new byte[validator.chunkSize];

    // setting up data compression stream
    compressedOutput = new LZFOutputStream(Channels.newOutputStream(channel));
    long progress = 0L;

    try
    {
        // stream each of the required sections of the file
        for (Pair<Long, Long> section : sections)
        {
            long start = validator == null ? section.left : validator.chunkStart(section.left);
            int readOffset = (int) (section.left - start);
            // seek to the beginning of the section
            file.seek(start);
            if (validator != null)
                validator.seek(start);

            // length of the section to read
            long length = section.right - start;
            // tracks write progress
            long bytesRead = 0;
            while (bytesRead < length)
            {
                long lastBytesRead = write(file, validator, readOffset, length, bytesRead);
                bytesRead += lastBytesRead;
                progress += (lastBytesRead - readOffset);
                session.progress(sstable.descriptor, ProgressInfo.Direction.OUT, progress, totalSize);
                readOffset = 0;
            }

            // make sure that current section is send
            compressedOutput.flush();
        }
    }
    finally
    {
        // no matter what happens close file
        FileUtils.closeQuietly(file);
        FileUtils.closeQuietly(validator);
    }
}
 

import org.apache.cassandra.io.util.DataIntegrityMetadata; //导入方法依赖的package包/类
/**
 * Stream file of specified sections to given channel.
 *
 * StreamWriter uses LZF compression on wire to decrease size to transfer.
 *
 * @param channel where this writes data to
 * @throws IOException on any I/O error
 */
public void write(WritableByteChannel channel) throws IOException
{
    long totalSize = totalSize();
    RandomAccessReader file = sstable.openDataReader();
    ChecksumValidator validator = null;
    if (new File(sstable.descriptor.filenameFor(Component.CRC)).exists())
        validator = DataIntegrityMetadata.checksumValidator(sstable.descriptor);

    transferBuffer = validator == null ? new byte[DEFAULT_CHUNK_SIZE] : new byte[validator.chunkSize];

    // setting up data compression stream
    compressedOutput = new LZFOutputStream(Channels.newOutputStream(channel));
    long progress = 0L;

    try
    {
        // stream each of the required sections of the file
        for (Pair<Long, Long> section : sections)
        {
            long start = validator == null ? section.left : validator.chunkStart(section.left);
            int skipBytes = (int) (section.left - start);
            // seek to the beginning of the section
            file.seek(start);
            if (validator != null)
                validator.seek(start);

            // length of the section to read
            long length = section.right - start;
            // tracks write progress
            long bytesTransferred = 0;
            while (bytesTransferred < length)
            {
                long lastWrite = write(file, validator, skipBytes, length, bytesTransferred);
                bytesTransferred += lastWrite;
                progress += lastWrite;
                session.progress(sstable.descriptor, ProgressInfo.Direction.OUT, progress, totalSize);
                skipBytes = 0;
            }

            // make sure that current section is send
            compressedOutput.flush();
        }
    }
    finally
    {
        // no matter what happens close file
        FileUtils.closeQuietly(file);
    }

    // release reference only when completed successfully
    sstable.releaseReference();
}
 

import org.apache.cassandra.io.util.DataIntegrityMetadata; //导入方法依赖的package包/类
/**
 * Stream file of specified sections to given channel.
 *
 * StreamWriter uses LZF compression on wire to decrease size to transfer.
 *
 * @param output where this writes data to
 * @throws IOException on any I/O error
 */
public void write(DataOutputStreamPlus output) throws IOException
{
    long totalSize = totalSize();
    logger.debug("[Stream #{}] Start streaming file {} to {}, repairedAt = {}, totalSize = {}", session.planId(),
                 sstable.getFilename(), session.peer, sstable.getSSTableMetadata().repairedAt, totalSize);

    try(RandomAccessReader file = sstable.openDataReader();
        ChecksumValidator validator = new File(sstable.descriptor.filenameFor(Component.CRC)).exists()
                                      ? DataIntegrityMetadata.checksumValidator(sstable.descriptor)
                                      : null;)
    {
        transferBuffer = validator == null ? new byte[DEFAULT_CHUNK_SIZE] : new byte[validator.chunkSize];

        // setting up data compression stream
        compressedOutput = new LZFOutputStream(output);
        long progress = 0L;

        // stream each of the required sections of the file
        for (Pair<Long, Long> section : sections)
        {
            long start = validator == null ? section.left : validator.chunkStart(section.left);
            int readOffset = (int) (section.left - start);
            // seek to the beginning of the section
            file.seek(start);
            if (validator != null)
                validator.seek(start);

            // length of the section to read
            long length = section.right - start;
            // tracks write progress
            long bytesRead = 0;
            while (bytesRead < length)
            {
                long lastBytesRead = write(file, validator, readOffset, length, bytesRead);
                bytesRead += lastBytesRead;
                progress += (lastBytesRead - readOffset);
                session.progress(sstable.descriptor, ProgressInfo.Direction.OUT, progress, totalSize);
                readOffset = 0;
            }

            // make sure that current section is sent
            compressedOutput.flush();
        }
        logger.debug("[Stream #{}] Finished streaming file {} to {}, bytesTransferred = {}, totalSize = {}",
                     session.planId(), sstable.getFilename(), session.peer, progress, totalSize);
    }
}
 

import org.apache.cassandra.io.util.DataIntegrityMetadata; //导入方法依赖的package包/类
/**
 * Stream file of specified sections to given channel.
 *
 * StreamWriter uses LZF compression on wire to decrease size to transfer.
 *
 * @param channel where this writes data to
 * @throws IOException on any I/O error
 */
public void write(WritableByteChannel channel) throws IOException
{
    long totalSize = totalSize();
    RandomAccessReader file = sstable.openDataReader();
    ChecksumValidator validator = new File(sstable.descriptor.filenameFor(Component.CRC)).exists()
                                ? DataIntegrityMetadata.checksumValidator(sstable.descriptor)
                                : null;
    transferBuffer = validator == null ? new byte[DEFAULT_CHUNK_SIZE] : new byte[validator.chunkSize];

    // setting up data compression stream
    compressedOutput = new LZFOutputStream(Channels.newOutputStream(channel));
    long progress = 0L;

    try
    {
        // stream each of the required sections of the file
        for (Pair<Long, Long> section : sections)
        {
            long start = validator == null ? section.left : validator.chunkStart(section.left);
            int skipBytes = (int) (section.left - start);
            // seek to the beginning of the section
            file.seek(start);
            if (validator != null)
                validator.seek(start);

            // length of the section to read
            long length = section.right - start;
            // tracks write progress
            long bytesTransferred = 0;
            while (bytesTransferred < length)
            {
                long lastWrite = write(file, validator, skipBytes, length, bytesTransferred);
                bytesTransferred += lastWrite;
                progress += lastWrite;
                session.progress(sstable.descriptor, ProgressInfo.Direction.OUT, progress, totalSize);
                skipBytes = 0;
            }

            // make sure that current section is send
            compressedOutput.flush();
        }
    }
    finally
    {
        // no matter what happens close file
        FileUtils.closeQuietly(file);
        FileUtils.closeQuietly(validator);
    }
}