mailreader2

Class ApplicationListener

java.lang.Object

mailreader2.ApplicationListener

All Implemented Interfaces:

EventListener, javax.servlet.ServletContextListener

public final class ApplicationListener
extends Object
implements javax.servlet.ServletContextListener

ServletContextListener that initializes and finalizes the persistent storage of User and Subscription information for the Struts Demonstration Application, using an in-memory database backed by an XML file.

IMPLEMENTATION WARNING - If this web application is run from a WAR file, or in another environment where reading and writing of the web application resource is impossible, the initial contents will be copied to a file in the web application temporary directory provided by the container. This is for demonstration purposes only - you should NOT assume that files written here will survive a restart of your servlet container.

This class was borrowed from the Shale Mailreader. Changes were:

• Path to database.xml (under classes here).
• Class to store protocol list (an array here).

DEVELOPMENT NOTE - Another approach would be to instantiate the database via Spring.

Field Summary

Fields

Modifier and Type	Field and Description
static String	DATABASE_KEY Appication scope attribute key under which the in-memory version of our database is stored.
static String	PROTOCOLS_KEY Application scope attribute key under which the valid selection items for the protocol property is stored.

Constructor Summary

Constructors

Constructor and Description
ApplicationListener()

Method Summary

Methods

Modifier and Type	Method and Description
void	contextDestroyed(javax.servlet.ServletContextEvent event) Gracefully shut down this database, releasing any resources that were allocated at initialization.
void	contextInitialized(javax.servlet.ServletContextEvent event) Initialize and load our initial database from persistent storage.
String	getPathname() Return the application resource path to the database.
void	setPathname(String pathname) Set the application resource path to the database.

Methods inherited from class java.lang.Object

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

Field Detail

DATABASE_KEY

public static final String DATABASE_KEY

Appication scope attribute key under which the in-memory version of our database is stored.

See Also:

Constant Field Values

PROTOCOLS_KEY

public static final String PROTOCOLS_KEY

Application scope attribute key under which the valid selection items for the protocol property is stored.

See Also:

Constant Field Values

Constructor Detail

ApplicationListener

public ApplicationListener()

Method Detail

getPathname

public String getPathname()

Return the application resource path to the database.

Returns:

application resource path path to the database

setPathname

public void setPathname(String pathname)

Set the application resource path to the database.

Parameters:

pathname - to the database

contextDestroyed

public void contextDestroyed(javax.servlet.ServletContextEvent event)

Gracefully shut down this database, releasing any resources that were allocated at initialization.

Specified by:

contextDestroyed in interface javax.servlet.ServletContextListener

Parameters:

event - ServletContextEvent to process

contextInitialized

public void contextInitialized(javax.servlet.ServletContextEvent event)

Initialize and load our initial database from persistent storage.

Specified by:

contextInitialized in interface javax.servlet.ServletContextListener

Parameters:

event - The context initialization event