Version (OpenEMS Javadoc)

All Known Implementing Classes:: AbstractVersion, Version1, Version2, Version3

public interface Version

Represents a data model version of the rrd4j database files.

Note: does not represent the version of the rrd db which you can set via RrdDef.setVersion(int).

Versions are built to run after another. e.g. if someone writes a version 4 this version need to migrate data from version 3.

Nested Class Summary

Nested Classes

Modifier and Type

Interface

Description

static final record

Version.CreateDatabaseConfig
Method Summary

Modifier and Type

Method

Description

org.rrd4j.core.RrdDb

createNewDb(Version.CreateDatabaseConfig config)

Creates a new database with the given Version.CreateDatabaseConfig.

int

getVersion()

Gets the version number of this Version.

org.rrd4j.core.RrdDb

migrate(org.rrd4j.core.RrdDb oldDb, Version.CreateDatabaseConfig config)

Migrates the old database into a new one by creating a temporary file database of the Version.CreateDatabaseConfig.

static Comparator<Version>

numberComparator()

Creates a Comparator, which sorts the versions by its version number ascending.

Method Details
- numberComparator
  
  static Comparator<Version> numberComparator()
  
  Creates a Comparator, which sorts the versions by its version number ascending. The number can be obtained with getVersion().
  
  Returns:
  
  the Comparator
- getVersion
  
  int getVersion()
  
  Gets the version number of this Version.
  
  Returns:
  
  the version number
- createNewDb
  
  org.rrd4j.core.RrdDb createNewDb(Version.CreateDatabaseConfig config) throws IOException
  
  Creates a new database with the given Version.CreateDatabaseConfig.
  
  Parameters:
  
  config - the configuration to create the database
  
  Returns:
  
  the created database
  
  Throws:
  
  IOException - on I/O-Error
- migrate
  
  org.rrd4j.core.RrdDb migrate(org.rrd4j.core.RrdDb oldDb, Version.CreateDatabaseConfig config) throws IOException
  
  Migrates the old database into a new one by creating a temporary file database of the Version.CreateDatabaseConfig.
  
  Parameters:
  
  oldDb - the old database instance of the previous version
  
  config - the Version.CreateDatabaseConfig to create a new database
  
  Returns:
  
  the migrated data in the new database
  
  Throws:
  
  IOException - on I/O-Error