org.apache.hadoop.hbase.io.hfile.bucket
Class FileIOEngine

java.lang.Object
  org.apache.hadoop.hbase.io.hfile.bucket.FileIOEngine

All Implemented Interfaces:

IOEngine

@InterfaceAudience.Private
public class FileIOEngine
extends Object
implements IOEngine

IO engine that stores data to a file on the local file system.

Constructor Summary

FileIOEngine(String filePath, long fileSize)

Method Summary

boolean	isPersistent() File IO engine is always able to support persistent storage for the cache
int	read(ByteBuffer dstBuffer, long offset) Transfers data from file to the given byte buffer
void	shutdown() Close the file
void	sync() Sync the data to file after writing
String	toString()
void	write(ByteBuffer srcBuffer, long offset) Transfers data from the given byte buffer to file

Methods inherited from class java.lang.Object

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

Constructor Detail

FileIOEngine

public FileIOEngine(String filePath,
                    long fileSize)
             throws IOException

Throws:

IOException

Method Detail

toString

public String toString()

Overrides:

toString in class Object

isPersistent

public boolean isPersistent()

File IO engine is always able to support persistent storage for the cache

Specified by:

isPersistent in interface IOEngine

Returns:

true

read

public int read(ByteBuffer dstBuffer,
                long offset)
         throws IOException

Transfers data from file to the given byte buffer

Specified by:

read in interface IOEngine

Parameters:

dstBuffer - the given byte buffer into which bytes are to be written

offset - The offset in the file where the first byte to be read

Returns:

number of bytes read

Throws:

IOException

write

public void write(ByteBuffer srcBuffer,
                  long offset)
           throws IOException

Transfers data from the given byte buffer to file

Specified by:

write in interface IOEngine

Parameters:

srcBuffer - the given byte buffer from which bytes are to be read

offset - The offset in the file where the first byte to be written

Throws:

IOException

sync

public void sync()
          throws IOException

Sync the data to file after writing

Specified by:

sync in interface IOEngine

Throws:

IOException

shutdown

public void shutdown()

Close the file

Specified by:

shutdown in interface IOEngine