org.rrd4j.core

Class RrdBerkeleyDbBackendFactory

java.lang.Object

org.rrd4j.core.RrdBackendFactory

org.rrd4j.core.RrdBerkeleyDbBackendFactory

public class RrdBerkeleyDbBackendFactory
extends RrdBackendFactory

RrdBackendFactory that uses Oracle Berkeley DB Java Edition to read data. Construct a BerkeleyDB Database object and pass it via the constructor.

Author:

Mathias Bogaert

Constructor Summary

Constructors

Constructor and Description
RrdBerkeleyDbBackendFactory(Database rrdDatabase) Constructor for RrdBerkeleyDbBackendFactory.

Method Summary

Methods

Modifier and Type	Method and Description
void	delete(String path) delete.
protected boolean	exists(String path) Determines if a storage with the given path already exists.
String	getName() getName.
protected RrdBackend	open(String path, boolean readOnly) Creates RrdBackend object for the given storage path.
protected boolean	shouldValidateHeader(String path) Determines if the header should be validated.

Methods inherited from class org.rrd4j.core.RrdBackendFactory

getDefaultFactory, getFactory, registerAndSetAsDefaultFactory, registerFactory, setDefaultFactory

Methods inherited from class java.lang.Object

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

Constructor Detail

RrdBerkeleyDbBackendFactory

public RrdBerkeleyDbBackendFactory(Database rrdDatabase)

Constructor for RrdBerkeleyDbBackendFactory.

Parameters:

rrdDatabase - a Database object.

Method Detail

open

protected RrdBackend open(String path,
              boolean readOnly)
                   throws IOException

Creates RrdBackend object for the given storage path. Creates new RrdBerkeleyDbBackend object for the given id (path).

Specified by:

open in class RrdBackendFactory

Parameters:

path - Storage path

readOnly - True, if the storage should be accessed in read/only mode. False otherwise.

Returns:

Backend object which handles all I/O operations for the given storage path

Throws:

IOException - Thrown in case of I/O error.

delete

public void delete(String path)

delete.

Parameters:

path - a String object.

exists

protected boolean exists(String path)
                  throws IOException

Determines if a storage with the given path already exists. Checks if the RRD with the given id (path) already exists in the database.

Specified by:

exists in class RrdBackendFactory

Parameters:

path - Storage path

Returns:

a boolean.

Throws:

IOException - if any.

shouldValidateHeader

protected boolean shouldValidateHeader(String path)

Determines if the header should be validated.

Specified by:

shouldValidateHeader in class RrdBackendFactory

Parameters:

path - Storage path

Returns:

a boolean.

getName

public String getName()

getName.

Specified by:

getName in class RrdBackendFactory

Returns:

The String "BERKELEY".