Package net.sf.jasperreports.engine.util

Class JRConcurrentSwapFile

java.lang.Object

net.sf.jasperreports.engine.util.JRSwapFile

net.sf.jasperreports.engine.util.JRConcurrentSwapFile

public class JRConcurrentSwapFile
extends JRSwapFile

JRSwapFile derived class that uses a FileChannel to perform concurrent I/O on the swap file.

Author:

Lucian Chirita (lucianc@users.sourceforge.net)

Nested Class Summary

Nested classes/interfaces inherited from class net.sf.jasperreports.engine.util.JRSwapFile

JRSwapFile.LongQueue, JRSwapFile.SwapHandle

Field Summary

Fields

Modifier and Type	Field	Description
static final String	EXCEPTION_MESSAGE_KEY_INSUFFICIENT_DATA

Fields inherited from class net.sf.jasperreports.engine.util.JRSwapFile

file, PROPERTY_DELETE_ON_EXIT, swapFile

Constructor Summary

Constructors

Constructor	Description
JRConcurrentSwapFile(String directory, int blockSize, int minGrowCount)	Creates a swap file.

Method Summary

Modifier and Type	Method	Description
protected void	read(byte[] data, int dataOffset, int dataLength, long fileOffset)
String	toString()
protected void	write(byte[] data, int dataSize, int dataOffset, long fileOffset)

Methods inherited from class net.sf.jasperreports.engine.util.JRSwapFile

dispose, finalize, free, freeBlocks, read, reserveFreeBlocks, write

Methods inherited from class java.lang.Object

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

Field Details

EXCEPTION_MESSAGE_KEY_INSUFFICIENT_DATA

public static final String EXCEPTION_MESSAGE_KEY_INSUFFICIENT_DATA

See Also:

• Constant Field Values

Constructor Details

JRConcurrentSwapFile

public JRConcurrentSwapFile(String directory,
 int blockSize,
 int minGrowCount)

Creates a swap file. The file name is generated automatically.

Parameters:

directory - the directory where the file should be created.

blockSize - the size of the blocks allocated by the swap file

minGrowCount - the minimum number of blocks by which the swap file grows when full

Method Details

toString

public String toString()

Overrides:

toString in class JRSwapFile

write

protected void write(byte[] data,
 int dataSize,
 int dataOffset,
 long fileOffset)
              throws IOException

Overrides:

write in class JRSwapFile

Throws:

IOException

read

protected void read(byte[] data,
 int dataOffset,
 int dataLength,
 long fileOffset)
             throws IOException

Overrides:

read in class JRSwapFile

Throws:

IOException