org.apache.cassandra.hints

Class ChecksummedDataInput

java.lang.Object

java.io.InputStream

org.apache.cassandra.io.util.RebufferingInputStream

org.apache.cassandra.hints.ChecksummedDataInput

All Implemented Interfaces:

java.io.Closeable, java.io.DataInput, java.lang.AutoCloseable, DataInputPlus

Direct Known Subclasses:

CompressedChecksummedDataInput, EncryptedChecksummedDataInput

public class ChecksummedDataInput
extends RebufferingInputStream

A RandomAccessReader wrapper that calculates the CRC in place. Useful for HintsReader, for example, where we must verify the CRC, yet don't want to allocate an extra byte array just that purpose. The CRC can be embedded in the input stream and checked via checkCrc(). In addition to calculating the CRC, it allows to enforce a maximum known size. This is needed so that Mutation.MutationSerializer doesn't blow up the heap when deserializing a corrupted sequence by reading a huge corrupted length of bytes via ByteBufferUtil.readWithLength(java.io.DataInput).

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.io.util.DataInputPlus

DataInputPlus.DataInputStreamPlus

Field Summary

Fields

Modifier and Type	Field and Description
protected long	bufferOffset
protected ChannelProxy	channel

Fields inherited from class org.apache.cassandra.io.util.RebufferingInputStream

buffer

Method Summary

Modifier and Type	Method and Description
long	bytesPastLimit()
boolean	checkCrc()
void	checkLimit(int length)
void	close()
ChannelProxy	getChannel()
protected java.lang.String	getPath()
protected long	getPosition() Returns the exact position in the uncompressed view of the file.
InputPosition	getSeekPosition() Return a seekable representation of the current position.
protected long	getSourcePosition() Returns the position in the source file, which is different for getPosition() for compressed/encrypted files and may be imprecise.
boolean	isEOF()
void	limit(long newLimit)
static ChecksummedDataInput	open(File file)
int	read(byte[] b, int off, int len)
protected void	readBuffer()
void	readFully(byte[] b)
protected void	reBuffer() Implementations must implement this method to refill the buffer.
void	resetCrc()
void	resetLimit()
void	seek(InputPosition pos)
void	tryUncacheRead()

Methods inherited from class org.apache.cassandra.io.util.RebufferingInputStream

read, readBoolean, readByte, readChar, readDouble, readFloat, readFully, readFully, readInt, readLine, readLong, readPrimitiveSlowly, readShort, readUnsignedByte, readUnsignedShort, readUnsignedVInt, readUTF, readVInt, skipBytes

Methods inherited from class java.io.InputStream

available, mark, markSupported, read, reset, skip

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.cassandra.io.util.DataInputPlus

skipBytesFully

Field Detail

bufferOffset

protected long bufferOffset

channel

protected final ChannelProxy channel

Method Detail

open

public static ChecksummedDataInput open(File file)

isEOF

public boolean isEOF()

getSeekPosition

public InputPosition getSeekPosition()

Return a seekable representation of the current position. For compressed files this is chunk position in file and offset within chunk.

seek

public void seek(InputPosition pos)

resetCrc

public void resetCrc()

limit

public void limit(long newLimit)

getPosition

protected long getPosition()

Returns the exact position in the uncompressed view of the file.

getSourcePosition

protected long getSourcePosition()

Returns the position in the source file, which is different for getPosition() for compressed/encrypted files and may be imprecise.

resetLimit

public void resetLimit()

checkLimit

public void checkLimit(int length)
                throws java.io.IOException

Throws:

java.io.IOException

bytesPastLimit

public long bytesPastLimit()

checkCrc

public boolean checkCrc()
                 throws java.io.IOException

Throws:

java.io.IOException

readFully

public void readFully(byte[] b)
               throws java.io.IOException

Specified by:

readFully in interface java.io.DataInput

Overrides:

readFully in class RebufferingInputStream

Throws:

java.io.IOException

read

public int read(byte[] b,
                int off,
                int len)
         throws java.io.IOException

Overrides:

read in class RebufferingInputStream

Throws:

java.io.IOException

reBuffer

protected void reBuffer()

Description copied from class: RebufferingInputStream

Implementations must implement this method to refill the buffer. They can expect the buffer to be empty when this method is invoked.

Specified by:

reBuffer in class RebufferingInputStream

readBuffer

protected void readBuffer()

tryUncacheRead

public void tryUncacheRead()

close

public void close()

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface java.lang.AutoCloseable

Overrides:

close in class java.io.InputStream

getPath

protected java.lang.String getPath()

getChannel

public ChannelProxy getChannel()