com.dpslink.base.servlet

Class BaseStartup

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

com.dpslink.base.servlet.BaseStartup

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

Direct Known Subclasses:

FlashStartup

public class BaseStartup
extends javax.servlet.http.HttpServlet

A pseudo servlet class that provides an orderly startup and shutdown of the web application. This class is used to control the starting and stopping of certain application processes, such as connection pools and the FIFO thread queue.

Unlike a typical servlet class, this servlet's methods are only invoked during application startup-shutdown and never during normal processing. The init method is automatically invoked during application startup and the destroy method is automatically invoked during application shutdown.

The automatic invocation of the init and destroy methods is triggered due to this class' definition in the web application's web.xml file. The definition includes a <load-on-startup> directive as shown below.

 <servlet id="Servlet_BaseStartup">
    <servlet-name>BaseStartup</servlet-name>
    <display-name>BaseStartup</display-name>
    <servlet-class>com.dpslink.base.servlet.BaseStartup</servlet-class>
    <load-on-startup>100</load-on-startup>
 </servlet>
 

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static long	serialVersionUID The class' serialization version id.

Constructor Summary

Constructors

Constructor and Description
BaseStartup()

Method Summary

Modifier and Type	Method and Description
void	destroy() Handles web application shutdown processing.
protected void	destroyImpl() Provides additional application-specific functionality for shutdown processing.
void	init() Handles web application startup processing.
protected void	initImpl() Provides additional application-specific functionality for startup processing.

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doGet, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, log, log

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

The class' serialization version id.

See Also:

Constant Field Values

Constructor Detail

BaseStartup

public BaseStartup()

Method Detail

init

public void init()
          throws javax.servlet.ServletException

Handles web application startup processing. Automatically invoked by the application server during startup.

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException - - if an error occurs during processing.

initImpl

protected void initImpl()

Provides additional application-specific functionality for startup processing. Invoked by the init method. Subclasses should override this method to provide application-specific processing.

destroy

public void destroy()

Handles web application shutdown processing. Automatically invoked by the application server during shutdown.

Specified by:

destroy in interface javax.servlet.Servlet

Overrides:

destroy in class javax.servlet.GenericServlet

destroyImpl

protected void destroyImpl()

Provides additional application-specific functionality for shutdown processing. Invoked by the destroy method. Subclasses should override this method to provide application-specific processing.