org.rrd4j.core
Class RrdRandomAccessFileBackendFactory

java.lang.Object
  org.rrd4j.core.RrdBackendFactory
      org.rrd4j.core.RrdFileBackendFactory
          org.rrd4j.core.RrdRandomAccessFileBackendFactory

Direct Known Subclasses:

RrdSafeFileBackendFactory

public class RrdRandomAccessFileBackendFactory
extends RrdFileBackendFactory

Factory class which creates actual RrdRandomAccessFileBackend objects. This was the default backend factory in Rrd4j before 1.4.0 release.

Constructor Summary

RrdRandomAccessFileBackendFactory()

Method Summary

protected boolean	exists(String path) Method to determine if a file with the given path already exists.
String	getName() Returns the name (primary ID) for the factory.
protected RrdBackend	open(String path, boolean readOnly) Creates RrdFileBackend object for the given file 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

RrdRandomAccessFileBackendFactory

public RrdRandomAccessFileBackendFactory()

Method Detail

open

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

Creates RrdFileBackend object for the given file path.

Specified by:

open in class RrdBackendFactory

Parameters:

path - File path

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

Returns:

RrdFileBackend object which handles all I/O operations for the given file path

Throws:

IOException - Thrown in case of I/O error.

exists

protected boolean exists(String path)

Method to determine if a file with the given path already exists.

Overrides:

exists in class RrdFileBackendFactory

Parameters:

path - File path

Returns:

True, if such file exists, false otherwise.

shouldValidateHeader

protected boolean shouldValidateHeader(String path)
                                throws IOException

Description copied from class: RrdBackendFactory

Determines if the header should be validated.

Overrides:

shouldValidateHeader in class RrdFileBackendFactory

Parameters:

path - Storage path

Returns:

True, if the header should be validated for this factory

Throws:

IOException - if header validation fails

getName

public String getName()

Description copied from class: RrdBackendFactory

Returns the name (primary ID) for the factory.

Specified by:

getName in class RrdBackendFactory

Returns:

Name of the factory.