Package org.yamcs.mdb

Class EmptyNodeLoader

java.lang.Object

org.yamcs.mdb.EmptyNodeLoader

All Implemented Interfaces:

SpaceSystemLoader

public class EmptyNodeLoader
extends Object
implements SpaceSystemLoader

Database "loader" that simply creates an empty SpaceSystem with the given name

Constructor Summary

Constructors

Constructor	Description
EmptyNodeLoader(String name)
EmptyNodeLoader(YConfiguration args)

Method Summary

Modifier and Type	Method	Description
String	getConfigName()	The filename used to save the database after all the loaders have loaded it, is based on a concatenation of the config names returned by the loaders.
SpaceSystem	load()	loads the SpaceSystem database in memory.
boolean	needsUpdate(RandomAccessFile consistencyDateFile)
void	writeConsistencyDate(FileWriter consistencyDateFile)

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.yamcs.mdb.SpaceSystemLoader

getWriter, isWritable, loadList

Constructor Details

EmptyNodeLoader

public EmptyNodeLoader(YConfiguration args)

EmptyNodeLoader

public EmptyNodeLoader(String name)

Method Details

load

public SpaceSystem load()
                 throws ConfigurationException,
DatabaseLoadException

Description copied from interface: SpaceSystemLoader

loads the SpaceSystem database in memory. Some references may be unresolved

Specified by:

load in interface SpaceSystemLoader

Throws:

DatabaseLoadException

ConfigurationException

needsUpdate

public boolean needsUpdate(RandomAccessFile consistencyDateFile)
                    throws IOException,
ConfigurationException

Specified by:

needsUpdate in interface SpaceSystemLoader

Parameters:

consistencyDateFile - check in this file when the last database has been loaded

Returns:

if this loader has to reload the database from its source

Throws:

IOException - if the consistencyDateFile can not be read for some reason

ConfigurationException

getConfigName

public String getConfigName()
                     throws ConfigurationException

Description copied from interface: SpaceSystemLoader

The filename used to save the database after all the loaders have loaded it, is based on a concatenation of the config names returned by the loaders. Thus if a loader can have multiple versions of the database, they should be saved in multiple files.

Specified by:

getConfigName in interface SpaceSystemLoader

Returns:

a string to be used as the filename where the serialised instance will be stored.

Throws:

ConfigurationException - in case some of the configuration properties do not exist

writeConsistencyDate

public void writeConsistencyDate(FileWriter consistencyDateFile)
                          throws IOException

Specified by:

writeConsistencyDate in interface SpaceSystemLoader

Parameters:

consistencyDateFile - the file in which the consistency date should be written

Throws:

IOException - if the consistency date file can't be written for some reason