Package de.aristaflow.adept2.base.registry.dbconfiguration

Class TableManager

java.lang.Object

de.aristaflow.adept2.base.registry.dbconfiguration.TableManager

All Implemented Interfaces:

EventListener<ConfigurationEvent>

public class TableManager
extends Object
implements EventListener<ConfigurationEvent>

This class creates and drops tables for a DatabaseConfiguration. This way there are no superfluous tables for runtime configurations.
A table is created as soon as the corresponding configuration gets a value and it will be removed as soon as the table is cleared.

This implementation creates tables having 50 characters for the key and 1000 characters for the value.

Field Summary

Fields

Modifier and Type	Field	Description
protected final JDBCDataSource	dataSource	The data source storing the runtime configuration table.
protected final String	keyColumn	The name of the column for the keys of the runtime configuration.
protected final Logger	logger	The logger for problems creating or dropping the table.
protected boolean	tableExists	Whether the table for the runtime configuration exists.
protected final String	tableName	The name of the table for the runtime configuration.
protected final String	valueColumn	The name of the column for the values of the runtime configuration.

Constructor Summary

Constructors

Constructor	Description
TableManager(Logger logger, JDBCDataSource dataSource, String tableName, String keyColumn, String valueColumn)	Creates a new listener that creates and drops tables for runtime configurations.

Method Summary

Modifier and Type	Method	Description
protected void	createOrUpdateTable(boolean create)	Creates or updates the table for the runtime configuration.
protected void	dropTable()	Drops the table for the runtime configuration.
void	onEvent(ConfigurationEvent event)

Methods inherited from class java.lang.Object

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

Field Details

logger

protected final Logger logger

The logger for problems creating or dropping the table.

dataSource

protected final JDBCDataSource dataSource

The data source storing the runtime configuration table.

tableName

protected final String tableName

The name of the table for the runtime configuration.

keyColumn

protected final String keyColumn

The name of the column for the keys of the runtime configuration.

valueColumn

protected final String valueColumn

The name of the column for the values of the runtime configuration.

tableExists

protected boolean tableExists

Whether the table for the runtime configuration exists.

Constructor Details

TableManager

public TableManager(Logger logger,
 JDBCDataSource dataSource,
 String tableName,
 String keyColumn,
 String valueColumn)
             throws SQLException

Creates a new listener that creates and drops tables for runtime configurations. The constructor checks whether the table already exists.

Parameters:

logger - The logger for problems creating or dropping the table.

dataSource - The data source storing the runtime configuration table.

tableName - The name of the table for the runtime configuration.

keyColumn - The name of the column for the keys of the runtime configuration.

valueColumn - The name of the column for the values of the runtime configuration.

Throws:

SQLException - If detecting whether the table exists or not fails, an SQLException will be thrown.

Method Details

createOrUpdateTable

protected void createOrUpdateTable(boolean create)

Creates or updates the table for the runtime configuration. Creating only applies the initial update.

Parameters:

create - Whether to create the table (instead of updating).

dropTable

protected void dropTable()

Drops the table for the runtime configuration.

onEvent

public void onEvent(ConfigurationEvent event)

Specified by:

onEvent in interface EventListener<ConfigurationEvent>