alma.acs.util.stringqueue

Class QueueEntry

java.lang.Object

alma.acs.util.stringqueue.QueueEntry

public class QueueEntry
extends java.lang.Object

An entry of the cache. It contains the name of the file where the entry is stored together with the position of the entry. Having the name of the file allows to open and close the file when needed. In a previous version there was a RandomAccessFile instead of the name but it ended up with an error because the number of open file was exceeding the maximum allowed.

Author:

acaproni

Field Summary

Fields

Modifier and Type	Field and Description
long	end The ending position of the entry in the file
static int	ENTRY_LENGTH The length of the bytes representing each entry.
int	key The key of the file where the entry is stored
long	start The starting position of the entry in the file

Constructor Summary

Constructors

Constructor and Description
QueueEntry(java.lang.Integer key, long startPos, long endPos) Constructor
QueueEntry(java.lang.String hexadecimal) Constructor.

Method Summary

Modifier and Type	Method and Description
java.lang.String	toHexadecimal() Translate the content of the entry in an hexadecimal string composed of the key, the start and end.

Methods inherited from class java.lang.Object

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

Field Detail

ENTRY_LENGTH

public static final int ENTRY_LENGTH

The length of the bytes representing each entry.

This number is useful while caching the entries on a file.

40 is 8 for the integer and 2 time 16 for the longs.

See Also:

toBytes(), Constant Field Values

key

public final int key

The key of the file where the entry is stored

start

public final long start

The starting position of the entry in the file

end

public final long end

The ending position of the entry in the file

Constructor Detail

QueueEntry

public QueueEntry(java.lang.Integer key,
                  long startPos,
                  long endPos)

Constructor

Parameters:

key - The key of the file where the entry is stored

startPos - The starting position of the entry in the file

endPos - The ending position of the entry in the file

QueueEntry

public QueueEntry(java.lang.String hexadecimal)

Constructor.

Build the entry by its hexadecimal representation

Parameters:

hexadecimal -

See Also:

toHexadecimal()

Method Detail

toHexadecimal

public java.lang.String toHexadecimal()

Translate the content of the entry in an hexadecimal string composed of the key, the start and end.

The array returned by this method can be written on a file. Its length is constant for each possible entry so the fields are not separated.

Returns:

An hexadecimal string representing the content of this entry