Package org.rrd4j.core

Class RrdMemoryBackend

java.lang.Object

org.rrd4j.core.RrdBackend

org.rrd4j.core.ByteBufferBackend

org.rrd4j.core.RrdMemoryBackend

public class RrdMemoryBackend
extends ByteBufferBackend

Backend to be used to store all RRD bytes in memory.

Field Summary

Fields inherited from class org.rrd4j.core.RrdBackend

BYTEORDER

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	RrdMemoryBackend(String path, AtomicReference<ByteBuffer> refbb)	Constructor for RrdMemoryBackend.

Method Summary

Modifier and Type	Method	Description
protected void	close()	This method is required by the base class definition, but it does not releases any memory resources at all.
long	getLength()	Returns the number of RRD bytes in the underlying storage.
protected void	setLength(long length)	Sets the number of bytes in the underlying RRD storage.

Methods inherited from class org.rrd4j.core.ByteBufferBackend

getCharBuffer, isDirty, read, 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 Detail

RrdMemoryBackend

protected RrdMemoryBackend(String path,
                           AtomicReference<ByteBuffer> refbb)

Constructor for RrdMemoryBackend.

Parameters:

path - a String object.

refbb -

Method Detail

setLength

protected void setLength(long length)
                  throws IOException

Description copied from class: RrdBackend

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

Specified by:

setLength in class RrdBackend

Parameters:

length - Length of the underlying RRD storage in bytes.

Throws:

IOException - Thrown in case of I/O error.

getLength

public long getLength()
               throws IOException

Description copied from class: RrdBackend

Returns the number of RRD bytes in the underlying storage.

Specified by:

getLength in class RrdBackend

Returns:

Number of RRD bytes in the storage.

Throws:

IOException - Thrown in case of I/O error.

close

protected void close()
              throws IOException

This method is required by the base class definition, but it does not releases any memory resources at all.

Overrides:

close in class ByteBufferBackend

Throws:

IOException - if any.