com.db4o.internal

Class SystemInfoFileImpl

java.lang.Object

com.db4o.internal.SystemInfoFileImpl

All Implemented Interfaces:

SystemInfo

public class SystemInfoFileImpl
extends java.lang.Object
implements SystemInfo

Constructor Summary

Constructors

Constructor and Description
SystemInfoFileImpl(LocalObjectContainer file)

Method Summary

Methods

Modifier and Type	Method and Description
int	freespaceEntryCount() returns the number of entries in the Freespace Manager.
long	freespaceSize() returns the freespace size in the database in bytes.
long	totalSize() Returns the total size of the database on disk.

Methods inherited from class java.lang.Object

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

Constructor Detail

SystemInfoFileImpl

public SystemInfoFileImpl(LocalObjectContainer file)

Method Detail

freespaceEntryCount

public int freespaceEntryCount()

Description copied from interface: SystemInfo

returns the number of entries in the Freespace Manager.

A high value for the number of freespace entries is an indication that the database is fragmented and that defragment should be run.

Specified by:

freespaceEntryCount in interface SystemInfo

Returns:

the number of entries in the Freespace Manager.

freespaceSize

public long freespaceSize()

Description copied from interface: SystemInfo

returns the freespace size in the database in bytes.

When db4o stores modified objects, it allocates a new slot for it. During commit the old slot is freed. Free slots are collected in the freespace manager, so they can be reused for other objects.

This method returns a sum of the size of all free slots in the database file.

To reclaim freespace run defragment.

Specified by:

freespaceSize in interface SystemInfo

Returns:

the freespace size in the database in bytes.

totalSize

public long totalSize()

Description copied from interface: SystemInfo

Returns the total size of the database on disk.

Specified by:

totalSize in interface SystemInfo

Returns:

total size of database on disk