Package org.rrd4j.core

Class RrdByteArrayBackend

java.lang.Object

org.rrd4j.core.RrdBackend

org.rrd4j.core.ByteBufferBackend

org.rrd4j.core.RrdByteArrayBackend

public abstract class RrdByteArrayBackend
extends ByteBufferBackend

Abstract byte array based backend.

Field Summary

Fields inherited from class org.rrd4j.core.RrdBackend

BYTEORDER

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RrdByteArrayBackend(String path)	Constructor for RrdByteArrayBackend.

Method Summary

Modifier and Type	Method	Description
protected byte[]	getBuffer()
long	getLength()	Returns the number of RRD bytes in the underlying storage.
protected void	read(long offset, byte[] bytes)	read.
protected void	setBuffer(byte[] buffer)
protected void	setLength(long length)	Sets the number of bytes in the underlying RRD storage.

Methods inherited from class org.rrd4j.core.ByteBufferBackend

close, getCharBuffer, isDirty, readDouble, readDouble, readInt, readLong, readShort, rrdClose, setByteBuffer, write, writeDouble, writeDouble, writeDouble, writeInt, writeLong, writeShort, writeString

Methods inherited from class org.rrd4j.core.RrdBackend

done, getFactory, getPath, getUri, isCachingAllowed, isInstanceCreated, readAll, readString, writeString

Methods inherited from class java.lang.Object

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

Constructor Details

RrdByteArrayBackend

protected RrdByteArrayBackend(String path)

Constructor for RrdByteArrayBackend.

Parameters:

path - a String object.

Method Details

setBuffer

protected void setBuffer(byte[] buffer)

getBuffer

protected byte[] getBuffer()

read

protected void read(long offset,
 byte[] bytes)
             throws IOException

read.

Overrides:

read in class ByteBufferBackend

Parameters:

offset - a long.

bytes - an array of byte.

Throws:

IOException - if any.

IllegalArgumentException - if offset is bigger that the possible length.

getLength

public long getLength()

Returns the number of RRD bytes in the underlying storage.

Specified by:

getLength in class RrdBackend

Returns:

Number of RRD bytes held in memory.

setLength

protected void setLength(long length)
                  throws IOException

Sets the number of bytes in the underlying RRD storage. This method is called only once, immediately after a new RRD storage gets created.

It will reserves a memory section as a RRD storage.

Specified by:

setLength in class RrdBackend

Parameters:

length - Length of the underlying RRD storage in bytes.

Throws:

IllegalArgumentException - if length is bigger that the possible length.

IOException - Thrown in case of I/O error.