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org.activemq.io.util
Class DataContainer  

java.lang.Object
  org.activemq.io.util.DataContainer

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class DataContainer

extends java.lang.Object

A DataContainer handles file persistence for a DiskBoundedQueue The DataContainer is a temporary data structure, that is only designed to exist for the lifetime of the application

Version:

$Revision: 1.1.1.1 $

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Field Summary
private  CopyOnWriteArrayList	dataBlocks
private  java.io.File	dir
private  long	length
private static org.apache.commons.logging.Log	log
private  int	maxBlockSize
private  java.lang.String	name
private  FileDataBlock	readBlock
private  int	sequence
private  int	size
private static java.lang.String	SUFFIX
private  FileDataBlock	writeBlock

 

Constructor Summary
(package private)	DataContainer(java.io.File dir, java.lang.String name, int maxBlockSize)           Constructor for the data container

 

Method Summary
void	close()           close the DataContainer and corresponding FileDataBlocks
private  FileDataBlock	createDataBlock(int sequence)           create a FileDataBlock
(package private)  void	deleteAll()           Delete all previous files of the same suffix in the directory
boolean	isEmpty()
long	length()
byte[]	read()           read a block of data from the container
int	size()
void	write(byte[] data)           write a block of data into the Container

 

Methods inherited from class java.lang.Object

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

 

Field Detail

dataBlocks

private CopyOnWriteArrayList dataBlocks

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writeBlock

private FileDataBlock writeBlock

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readBlock

private FileDataBlock readBlock

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dir

private java.io.File dir

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length

private long length

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size

private int size

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name

private java.lang.String name

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maxBlockSize

private int maxBlockSize

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sequence

private int sequence

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SUFFIX

private static final java.lang.String SUFFIX

See Also:

Constant Field Values

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log

private static final org.apache.commons.logging.Log log

Constructor Detail

DataContainer

DataContainer(java.io.File dir,
              java.lang.String name,
              int maxBlockSize)
        throws java.io.IOException

Constructor for the data container

Method Detail

deleteAll

void deleteAll()

Delete all previous files of the same suffix in the directory

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isEmpty

public boolean isEmpty()

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length

public long length()

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size

public int size()

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write

public void write(byte[] data)
           throws java.io.IOException

write a block of data into the Container

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read

public byte[] read()
            throws java.io.IOException

read a block of data from the container

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close

public void close()
           throws java.io.IOException

close the DataContainer and corresponding FileDataBlocks

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createDataBlock

private FileDataBlock createDataBlock(int sequence)
                               throws java.io.IOException

create a FileDataBlock

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