org.sakaiproject.warehouse.impl

Class CallbackWarehouseTask

java.lang.Object

org.sakaiproject.warehouse.impl.CallbackWarehouseTask

All Implemented Interfaces:

org.sakaiproject.warehouse.service.WarehouseTask

public abstract class CallbackWarehouseTask
extends Object
implements org.sakaiproject.warehouse.service.WarehouseTask

Alternative to the BaseWarehouseTask. For really large datasets building up a giant list in memory before writing out to the db results in out of memory issues. Extending from this task will help.

The execute() method simply prepares the db (setup up the table, clears it etc). In your derived class you want to call execute(Object) with each entity as you go. This will batch up a smaller list and then send that to the ChildWarehouseTask which will do the real persistence. You need to call flush at the end of your work to make sure any remaining objects gets flushed out to the db.

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.commons.logging.Log	logger

Constructor Summary

Constructors

Constructor and Description
CallbackWarehouseTask()

Method Summary

Methods

Modifier and Type	Method and Description
void	execute()
protected void	execute(boolean flush)
void	execute(Object object)
void	flush()
int	getBatchsize()
DataSource	getDataSource()
org.sakaiproject.warehouse.service.DataWarehouseManager	getDataWarehouseManager()
InputStream	getTableDdl()
String	getTableDdlResource()
org.sakaiproject.warehouse.service.ChildWarehouseTask	getTask()
void	init() This method loads the tables and registers the task.
protected abstract void	process()
void	setBatchsize(int batchsize)
void	setDataSource(DataSource dataSource)
void	setDataWarehouseManager(org.sakaiproject.warehouse.service.DataWarehouseManager dataWarehouseManager)
void	setTableDdlResource(String tableDdlResource)
void	setTask(org.sakaiproject.warehouse.service.ChildWarehouseTask task)

Methods inherited from class java.lang.Object

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

Field Detail

logger

protected final org.apache.commons.logging.Log logger

Constructor Detail

CallbackWarehouseTask

public CallbackWarehouseTask()

Method Detail

flush

public void flush()
           throws Exception

Throws:

Exception

execute

public void execute()
             throws org.quartz.JobExecutionException

Specified by:

execute in interface org.sakaiproject.warehouse.service.WarehouseTask

Throws:

org.quartz.JobExecutionException

execute

public void execute(Object object)
             throws Exception

Throws:

Exception

execute

protected void execute(boolean flush)
                throws Exception

Throws:

Exception

init

public void init()

This method loads the tables and registers the task. This function is called after the task bean properties have been set. Children are singletons where there bean init function is this method.

getTableDdl

public InputStream getTableDdl()

process

protected abstract void process()

getDataSource

public DataSource getDataSource()

setDataSource

public void setDataSource(DataSource dataSource)

getTask

public org.sakaiproject.warehouse.service.ChildWarehouseTask getTask()

setTask

public void setTask(org.sakaiproject.warehouse.service.ChildWarehouseTask task)

getTableDdlResource

public String getTableDdlResource()

setTableDdlResource

public void setTableDdlResource(String tableDdlResource)

getDataWarehouseManager

public org.sakaiproject.warehouse.service.DataWarehouseManager getDataWarehouseManager()

setDataWarehouseManager

public void setDataWarehouseManager(org.sakaiproject.warehouse.service.DataWarehouseManager dataWarehouseManager)

getBatchsize

public int getBatchsize()

setBatchsize

public void setBatchsize(int batchsize)