com.db4o.io

Class MemoryBin

java.lang.Object

com.db4o.io.MemoryBin

All Implemented Interfaces:

Bin

public class MemoryBin
extends java.lang.Object
implements Bin

Constructor Summary

Constructors

Constructor and Description
MemoryBin(byte[] bytes, GrowthStrategy growthStrategy)
MemoryBin(int initialSize, GrowthStrategy growthStrategy)

Method Summary

Methods

Modifier and Type	Method and Description
long	bufferSize()
void	close() closes the Bin.
byte[]	data() Returns a copy of the raw data contained in this bin for external processing.
long	length() returns the length of the Bin (on disc, in memory).
int	read(long pos, byte[] bytes, int length) reads a given number of bytes into an array of bytes at an offset position.
void	sync() flushes the buffer content to the physical storage media.
void	sync(java.lang.Runnable runnable) runs the Runnable between two calls to sync();
int	syncRead(long position, byte[] bytes, int bytesToRead) reads a given number of bytes into an array of bytes at an offset position.
void	write(long pos, byte[] buffer, int length) for internal processing only.

Methods inherited from class java.lang.Object

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

Constructor Detail

MemoryBin

public MemoryBin(int initialSize,
         GrowthStrategy growthStrategy)

MemoryBin

public MemoryBin(byte[] bytes,
         GrowthStrategy growthStrategy)

Method Detail

length

public long length()

Description copied from interface: Bin

returns the length of the Bin (on disc, in memory).

Specified by:

length in interface Bin

bufferSize

public long bufferSize()

read

public int read(long pos,
       byte[] bytes,
       int length)
         throws Db4oIOException

Description copied from interface: Bin

reads a given number of bytes into an array of bytes at an offset position.

Specified by:

read in interface Bin

Parameters:

pos - the offset position to read at

bytes - the byte array to read bytes into

length - the number of bytes to be read

Returns:

Throws:

Db4oIOException

sync

public void sync()
          throws Db4oIOException

Description copied from interface: Bin

flushes the buffer content to the physical storage media.

Specified by:

sync in interface Bin

Throws:

Db4oIOException

syncRead

public int syncRead(long position,
           byte[] bytes,
           int bytesToRead)

Description copied from interface: Bin

reads a given number of bytes into an array of bytes at an offset position. In contrast to the normal Bin.read(long, byte[], int) method, the Bin should ensure direct access to the raw storage medium. No caching should take place.

Specified by:

syncRead in interface Bin

Parameters:

position - the offset position to read at

bytes - the byte array to read bytes into

bytesToRead - the number of bytes to be read

Returns:

close

public void close()

Description copied from interface: Bin

closes the Bin.

Specified by:

close in interface Bin

data

public byte[] data()

Returns a copy of the raw data contained in this bin for external processing. Access to the data is not guarded by synchronisation. If this method is called while the MemoryBin is in use, it is possible that the returned byte array is not consistent.

write

public void write(long pos,
         byte[] buffer,
         int length)
           throws Db4oIOException

for internal processing only.

Specified by:

write in interface Bin

Parameters:

pos - the offset position to write at

buffer - the array of bytes to write

length - the number of bytes to write

Throws:

Db4oIOException

sync

public void sync(java.lang.Runnable runnable)

Description copied from interface: Bin

runs the Runnable between two calls to sync();

Specified by:

sync in interface Bin