de.gerdiproject.harvest.application

Class ContextListener

java.lang.Object

de.gerdiproject.harvest.application.ContextListener

All Implemented Interfaces:

EventListener, javax.servlet.ServletContextListener

public abstract class ContextListener
extends Object
implements javax.servlet.ServletContextListener

This class registers a Logger and Harvester when the server is started. A sub-class with the @WebListener annotation must be implemented in order for the harvester micro service to work.

Author:

Robin Weiss

See Also:

WebListener, AbstractETL

Field Summary

Fields

Modifier and Type	Field and Description
protected static org.slf4j.Logger	LOGGER

Constructor Summary

Constructors

Constructor and Description
ContextListener()

Method Summary

Modifier and Type	Method and Description
void	contextDestroyed(javax.servlet.ServletContextEvent sce) This method is called when the server shuts down.
void	contextInitialized(javax.servlet.ServletContextEvent sce) This method is called when the server is set up.
protected abstract List<? extends AbstractETL<?,?>>	createETLs() Creates a list of AbstractETL implementations that can be chosen to extract, transform and load data from the targeted repository.
protected List<Class<? extends ILoader<?>>>	getLoaderClasses() Creates a list of ILoader implementations that can be chosen to transfer data to the search index.
protected String	getRepositoryName() Retrieves the name of the repository that is to be harvested.
protected String	getServiceName() Retrieves the name of this harvester service.
protected void	onResetContext(ResetContextEvent event) This event listener is called when the harvester service is reset.

Methods inherited from class java.lang.Object

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

Field Detail

LOGGER

protected static final org.slf4j.Logger LOGGER

Constructor Detail

ContextListener

public ContextListener()

Method Detail

getServiceName

protected String getServiceName()

Retrieves the name of this harvester service.

Returns:

the name of this harvester service

getRepositoryName

protected String getRepositoryName()

Retrieves the name of the repository that is to be harvested.

Returns:

the name of the repository that is to be harvested

createETLs

protected abstract List<? extends AbstractETL<?,?>> createETLs()

Creates a list of AbstractETL implementations that can be chosen to extract, transform and load data from the targeted repository.

Returns:

a list of AbstractETLs

getLoaderClasses

protected List<Class<? extends ILoader<?>>> getLoaderClasses()

Creates a list of ILoader implementations that can be chosen to transfer data to the search index.

Returns:

a list of ILoader

contextInitialized

public void contextInitialized(javax.servlet.ServletContextEvent sce)

This method is called when the server is set up. Creates a logger and harvester and sets them in the MainContext.

Specified by:

contextInitialized in interface javax.servlet.ServletContextListener

Parameters:

sce - the servlet context event that was initialized

See Also:

MainContext

contextDestroyed

public void contextDestroyed(javax.servlet.ServletContextEvent sce)

This method is called when the server shuts down. Currently does nothing.

Specified by:

contextDestroyed in interface javax.servlet.ServletContextListener

Parameters:

sce - the servlet context event that was destroyed

onResetContext

protected void onResetContext(ResetContextEvent event)

This event listener is called when the harvester service is reset.

Parameters:

event - the event that triggered the callback