org.apache.ignite.internal.processors.cache.persistence.wal

Class FileInput

java.lang.Object

org.apache.ignite.internal.processors.cache.persistence.wal.FileInput

All Implemented Interfaces:

DataInput, ByteBufferBackedDataInput

public final class FileInput
extends Object
implements ByteBufferBackedDataInput

File input, backed by byte buffer file input. This class allows to read data by chunks from file and then read primitives

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	FileInput.Crc32CheckingFileInput Checking of CRC32.

Constructor Summary

Constructors

Constructor and Description
FileInput(FileIO io, ByteBufferExpander buf)

Method Summary

Methods

Modifier and Type	Method and Description
ByteBuffer	buffer()
void	ensure(int requested) ensure that requested count of byte is available in data input and will try to load data if not
long	position()
boolean	readBoolean()
byte	readByte()
char	readChar()
double	readDouble()
float	readFloat()
void	readFully(byte[] b)
void	readFully(byte[] b, int off, int len)
int	readInt()
String	readLine()
long	readLong()
short	readShort()
int	readUnsignedByte()
int	readUnsignedShort()
String	readUTF()
void	seek(long pos)
int	skipBytes(int n)
FileInput.Crc32CheckingFileInput	startRead(boolean skipCheck)

Methods inherited from class java.lang.Object

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

Constructor Detail

FileInput

public FileInput(FileIO io,
         ByteBufferExpander buf)
          throws IOException

Parameters:

io - FileIO to read from.

buf - Buffer for reading blocks of data into.

Throws:

IOException

Method Detail

seek

public void seek(long pos)
          throws IOException

Parameters:

pos - Position in bytes from file begin.

Throws:

IOException

buffer

public ByteBuffer buffer()

Specified by:

buffer in interface ByteBufferBackedDataInput

Returns:

Underlying buffer.

ensure

public void ensure(int requested)
            throws IOException

ensure that requested count of byte is available in data input and will try to load data if not

Specified by:

ensure in interface ByteBufferBackedDataInput

Parameters:

requested - Requested number of bytes.

Throws:

IOException - If failed.

position

public long position()

Returns:

Position in the stream.

readFully

public void readFully(@NotNull
             byte[] b)
               throws IOException

Specified by:

readFully in interface DataInput

Throws:

IOException

readFully

public void readFully(@NotNull
             byte[] b,
             int off,
             int len)
               throws IOException

Specified by:

readFully in interface DataInput

Throws:

IOException

skipBytes

public int skipBytes(int n)
              throws IOException

Specified by:

skipBytes in interface DataInput

Throws:

IOException

readBoolean

public boolean readBoolean()
                    throws IOException

Specified by:

readBoolean in interface DataInput

Throws:

IOException

readByte

public byte readByte()
              throws IOException

Specified by:

readByte in interface DataInput

Throws:

IOException

readUnsignedByte

public int readUnsignedByte()
                     throws IOException

Specified by:

readUnsignedByte in interface DataInput

Throws:

IOException

readShort

public short readShort()
                throws IOException

Specified by:

readShort in interface DataInput

Throws:

IOException

readUnsignedShort

public int readUnsignedShort()
                      throws IOException

Specified by:

readUnsignedShort in interface DataInput

Throws:

IOException

readChar

public char readChar()
              throws IOException

Specified by:

readChar in interface DataInput

Throws:

IOException

readInt

public int readInt()
            throws IOException

Specified by:

readInt in interface DataInput

Throws:

IOException

readLong

public long readLong()
              throws IOException

Specified by:

readLong in interface DataInput

Throws:

IOException

readFloat

public float readFloat()
                throws IOException

Specified by:

readFloat in interface DataInput

Throws:

IOException

readDouble

public double readDouble()
                  throws IOException

Specified by:

readDouble in interface DataInput

Throws:

IOException

readLine

public String readLine()
                throws IOException

Specified by:

readLine in interface DataInput

Throws:

IOException

readUTF

public String readUTF()
               throws IOException

Specified by:

readUTF in interface DataInput

Throws:

IOException

startRead

public FileInput.Crc32CheckingFileInput startRead(boolean skipCheck)

Parameters:

skipCheck - If CRC check should be skipped.

Returns:

autoclosable fileInput, after its closing crc32 will be calculated and compared with saved one