Package org.apache.log.output.db

Class AbstractJDBCTarget

java.lang.Object

org.apache.log.output.AbstractTarget

org.apache.log.output.db.AbstractJDBCTarget

All Implemented Interfaces:

ErrorAware, LogTarget, Closeable

Direct Known Subclasses:

DefaultJDBCTarget

public abstract class AbstractJDBCTarget
extends AbstractTarget

Abstract JDBC target.

Author:

Avalon Development Team, Peter Donald

Field Summary

Fields

Modifier and Type	Field	Description
private Connection	m_connection
private DataSource	m_dataSource

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractJDBCTarget(DataSource dataSource)	Creation of a new instance of the AbstractJDBCTarget.

Method Summary

Modifier and Type	Method	Description
protected final void	checkConnection()	Utility method to check connection and bring it back up if necessary.
void	close()	Shutdown target.
protected void	closeConnection()	Close connection to underlying database.
protected void	doProcessEvent(LogEvent event)	Process a log event, via formatting and outputting it.
protected final Connection	getConnection()	Utility method for subclasses to access connection.
protected boolean	isStale()	Detect if connection is stale and should be reopened.
protected void	open()	Startup log session.
protected void	openConnection()	Open connection to underlying database.
protected abstract void	output(LogEvent event)	Output a log event to DB.

Methods inherited from class org.apache.log.output.AbstractTarget

getErrorHandler, isOpen, processEvent, setErrorHandler

Methods inherited from class java.lang.Object

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

Field Details

m_dataSource

private DataSource m_dataSource

m_connection

private Connection m_connection

Constructor Details

AbstractJDBCTarget

protected AbstractJDBCTarget(DataSource dataSource)

Creation of a new instance of the AbstractJDBCTarget.

Parameters:

dataSource - the JDBC datasource

Method Details

doProcessEvent

protected void doProcessEvent(LogEvent event)
                       throws Exception

Process a log event, via formatting and outputting it.

Specified by:

doProcessEvent in class AbstractTarget

Parameters:

event - the log event

Throws:

Exception - if an event processing error occurs

output

protected abstract void output(LogEvent event)

Output a log event to DB. This must be implemented by subclasses.

Parameters:

event - the log event.

open

protected void open()

Startup log session.

Overrides:

open in class AbstractTarget

openConnection

protected void openConnection()

Open connection to underlying database.

getConnection

protected final Connection getConnection()

Utility method for subclasses to access connection.

Returns:

the Connection

checkConnection

protected final void checkConnection()

Utility method to check connection and bring it back up if necessary.

isStale

protected boolean isStale()

Detect if connection is stale and should be reopened.

Returns:

true if connection is stale, false otherwise

close

public void close()

Shutdown target. Attempting to write to target after close() will cause errors to be logged.

Specified by:

close in interface Closeable

Overrides:

close in class AbstractTarget

closeConnection

protected void closeConnection()

Close connection to underlying database.