ch.systemsx.cisd.openbis.dss.generic.shared.utils

Class PostgresPlusFileSystemFreeSpaceProvider

java.lang.Object

ch.systemsx.cisd.openbis.dss.generic.shared.utils.PostgresPlusFileSystemFreeSpaceProvider

All Implemented Interfaces:

ch.systemsx.cisd.common.filesystem.IFreeSpaceProvider

public class PostgresPlusFileSystemFreeSpaceProvider
extends java.lang.Object
implements ch.systemsx.cisd.common.filesystem.IFreeSpaceProvider

PostgreSQL database files are designed to grow until they take up the entire available disk space. It is therefore impossible to estimate what part of a hard disk is "free" by just asking the file system.

The PostgresPlusFileSystemFreeSpaceProvider estimates the free space on a drive as the sum of the free disk space and the free space of a PostgreSQL database as returned by its "pgstattuple" extension.

 IMPORTANT: The class requires that the extension 'pgstattuple' is installed on the target
 PostgreSQL database. For PostgreSQL 9.1 this can be done by executing :
     
     psql -d DB_NAME -c "CREATE EXTENSION pgstattuple;"

Constructor Summary

Constructors

Constructor and Description
PostgresPlusFileSystemFreeSpaceProvider(java.util.Properties properties)

Method Summary

Methods

Modifier and Type	Method and Description
long	freeSpaceKb(ch.systemsx.cisd.common.filesystem.HostAwareFile path) Returns the free space on a drive or volume in kilobytes by invoking the command line.

Methods inherited from class java.lang.Object

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

Constructor Detail

PostgresPlusFileSystemFreeSpaceProvider

public PostgresPlusFileSystemFreeSpaceProvider(java.util.Properties properties)

Method Detail

freeSpaceKb

public long freeSpaceKb(ch.systemsx.cisd.common.filesystem.HostAwareFile path)
                 throws java.io.IOException

Description copied from interface: ch.systemsx.cisd.common.filesystem.IFreeSpaceProvider

Returns the free space on a drive or volume in kilobytes by invoking the command line.

Specified by:

freeSpaceKb in interface ch.systemsx.cisd.common.filesystem.IFreeSpaceProvider

Throws:

java.io.IOException