atg.servlet

Class GenericServletService

java.lang.Object

atg.servlet.GenericServletService

All Implemented Interfaces:

javax.servlet.Servlet

Direct Known Subclasses:

MappedJumpServlet

public class GenericServletService
extends java.lang.Object
implements javax.servlet.Servlet

Servlet implementation with support for self-configuration, naming resolution, performance profiling and logging.

Derived class should override the following methods:

• startService
• handleService
• stopService

The servlet may be configured from servlet init parameters. specified in a web application deployment descriptor. Named init parameters are treated as properties of the servlet. Parameters prefixed with cxt: are looked up using the servlets name context.

The following example serves to demonstrate configuration of a generic servlet service:

   <servlet>
     <servlet-name>MyServletService</servlet-name>
     <servlet-class>com.acme.servlet.MyServletService</servlet-class>
     <init-param>
       <param-name>loggingDebug</param-name>
       <param-value>false</param-value>
     </init-param>
     <init-param>
       <param-name>loggingWarning</param-name>
       <param-value>false</param-value>
     </init-param>
     <init-param>
       <param-name>loggingError</param-name>
       <param-value>true</param-value>
     </init-param>
     <init-param>
       <param-name>loggingInfo</param-name>
       <param-value>true</param-value>
     </init-param>
     <init-param>
       <param-name>MyString</param-name>
       <param-value>foobar</param-value>
     </init-param>
       <param-name>Object</param-name>
       <param-value>ctx:dynamo:/com/Acme/MyFooObject</param-value>
     </init-param>
   </servlet>
  

Derived servlets may use the lookup method to lookup objects in the servlets name context. The objects name context is accessable via the context property.

The servlet may log information using the logging facilities provided. Support for info, warning, error and debug levels are provided by the service.

If a performance monitor is enabled the servlet collects performance metrics about the handleService method.

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	CLASS_VERSION Class version string

Constructor Summary

Constructors

Constructor and Description
GenericServletService() Constructs an instanceof GenericServletService

Method Summary

Methods

Modifier and Type	Method and Description
void	destroy() Called by the web container to indicate to a servlet that it is being taken out of service
javax.naming.Context	getContext() Returns property Context
java.lang.String	getName() Returns property Name
javax.servlet.ServletConfig	getServletConfig() Returns property ServletConfig
javax.servlet.ServletContext	getServletContext() Returns property ServletContext
java.lang.String	getServletInfo() Access servlet info
void	handleService(javax.servlet.ServletRequest pServletRequest, javax.servlet.ServletResponse pServletResponse) Called by the servlet to indicate that a servlet should handle a request/response.
void	init(javax.servlet.ServletConfig pServletConfig) Called by the web container to indicate to a servlet that it is being placed into service.
boolean	isLoggingDebug() Returns property LoggingDebug
boolean	isLoggingError() Returns property LoggingError
boolean	isLoggingInfo() Returns property LoggingInfo
boolean	isLoggingWarning() Returns property LoggingWarning
void	logDebug(java.lang.String pMessage) Logs an debug event with the specified message
void	logDebug(java.lang.String pMessage, java.lang.Throwable pThrowable) Logs an debug event with the specified message and Throwable
void	logDebug(java.lang.Throwable pThrowable) Logs an debug event with the specified Throwable
void	logError(java.lang.String pMessage) Logs an error event with the specified message
void	logError(java.lang.String pMessage, java.lang.Throwable pThrowable) Logs an error event with the specified message and Throwable
void	logError(java.lang.Throwable pThrowable) Logs an error event with the specified Throwable
void	logInfo(java.lang.String pMessage) Logs an info event with the specified message
void	logInfo(java.lang.String pMessage, java.lang.Throwable pThrowable) Logs an info event with the specified message and Throwable
void	logInfo(java.lang.Throwable pThrowable) Logs an info event with the specified Throwable
void	logWarning(java.lang.String pMessage) Logs an warning event with the specified message
void	logWarning(java.lang.String pMessage, java.lang.Throwable pThrowable) Logs an warning event with the specified message and Throwable
void	logWarning(java.lang.Throwable pThrowable) Logs an warning event with the specified Throwable
java.lang.Object	lookup(java.lang.String pName) Retreives the named object
void	service(javax.servlet.ServletRequest pServletRequest, javax.servlet.ServletResponse pServletResponse) Called by the web container to indicate that a servlet should service a request/response
void	setLoggingDebug(boolean pLoggingDebug) Sets property LoggingDebug
void	setLoggingError(boolean pLoggingError) Sets property LoggingError
void	setLoggingInfo(boolean pLoggingInfo) Sets property LoggingInfo
void	setLoggingWarning(boolean pLoggingWarning) Sets property LoggingWarning
void	startService(javax.servlet.ServletConfig pServletConfig) Called by the servlet after it has been initialzed.
void	stopService() Called by the servlet service after it has been destroyed.

Methods inherited from class java.lang.Object

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

Field Detail

CLASS_VERSION

public static java.lang.String CLASS_VERSION

Class version string

Constructor Detail

GenericServletService

public GenericServletService()

Constructs an instanceof GenericServletService

Method Detail

getServletConfig

public javax.servlet.ServletConfig getServletConfig()

Returns property ServletConfig

Specified by:

getServletConfig in interface javax.servlet.Servlet

getName

public java.lang.String getName()

Returns property Name

getServletContext

public javax.servlet.ServletContext getServletContext()

Returns property ServletContext

getContext

public javax.naming.Context getContext()

Returns property Context

setLoggingInfo

public void setLoggingInfo(boolean pLoggingInfo)

Sets property LoggingInfo

isLoggingInfo

public boolean isLoggingInfo()

Returns property LoggingInfo

setLoggingWarning

public void setLoggingWarning(boolean pLoggingWarning)

Sets property LoggingWarning

isLoggingWarning

public boolean isLoggingWarning()

Returns property LoggingWarning

setLoggingError

public void setLoggingError(boolean pLoggingError)

Sets property LoggingError

isLoggingError

public boolean isLoggingError()

Returns property LoggingError

setLoggingDebug

public void setLoggingDebug(boolean pLoggingDebug)

Sets property LoggingDebug

isLoggingDebug

public boolean isLoggingDebug()

Returns property LoggingDebug

getServletInfo

public java.lang.String getServletInfo()

Access servlet info

Specified by:

getServletInfo in interface javax.servlet.Servlet

startService

public void startService(javax.servlet.ServletConfig pServletConfig)
                  throws javax.servlet.ServletException

Called by the servlet after it has been initialzed. Derived classes should overrise this method to initialize the service.

Parameters:

pServletConfig - servlet configuration information.

Throws:

ServletsException - if an exception occurs when starting this servlet.

javax.servlet.ServletException

init

public void init(javax.servlet.ServletConfig pServletConfig)
          throws javax.servlet.ServletException

Called by the web container to indicate to a servlet that it is being placed into service.

Specified by:

init in interface javax.servlet.Servlet

Parameters:

pServletConfig - servlet configuration information.

Throws:

javax.servlet.ServletException - if an exception occurs when initializing this servlet.

handleService

public void handleService(javax.servlet.ServletRequest pServletRequest,
                 javax.servlet.ServletResponse pServletResponse)
                   throws java.io.IOException,
                          javax.servlet.ServletException

Called by the servlet to indicate that a servlet should handle a request/response. Derived classes should override this method to handle the servicing of a request

Parameters:

pServletRequest - the servlet request

pServletResponse - the servlet response

Throws:

java.io.IOException - when an i/o error occurs

javax.servlet.ServletException - when an error occurs when processing this servlet

service

public void service(javax.servlet.ServletRequest pServletRequest,
           javax.servlet.ServletResponse pServletResponse)
             throws java.io.IOException,
                    javax.servlet.ServletException

Called by the web container to indicate that a servlet should service a request/response

Specified by:

service in interface javax.servlet.Servlet

Parameters:

pServletRequest - the servlet request

pServletResponse - the servlet response

Throws:

java.io.IOException - when an i/o error occurs

javax.servlet.ServletException - when an error occurs when processing this servlet

stopService

public void stopService()

Called by the servlet service after it has been destroyed. Derived classes should override this method to perform any cleanup.

destroy

public void destroy()

Called by the web container to indicate to a servlet that it is being taken out of service

Specified by:

destroy in interface javax.servlet.Servlet

lookup

public java.lang.Object lookup(java.lang.String pName)
                        throws javax.naming.NamingException

Retreives the named object

Parameters:

pName - the name of the object

Returns:

the named object

Throws:

javax.naming.NamingException - if an error occurs

logInfo

public void logInfo(java.lang.String pMessage)

Logs an info event with the specified message

logInfo

public void logInfo(java.lang.Throwable pThrowable)

Logs an info event with the specified Throwable

logInfo

public void logInfo(java.lang.String pMessage,
           java.lang.Throwable pThrowable)

Logs an info event with the specified message and Throwable

logWarning

public void logWarning(java.lang.String pMessage)

Logs an warning event with the specified message

logWarning

public void logWarning(java.lang.Throwable pThrowable)

Logs an warning event with the specified Throwable

logWarning

public void logWarning(java.lang.String pMessage,
              java.lang.Throwable pThrowable)

Logs an warning event with the specified message and Throwable

logError

public void logError(java.lang.String pMessage)

Logs an error event with the specified message

logError

public void logError(java.lang.Throwable pThrowable)

Logs an error event with the specified Throwable

logError

public void logError(java.lang.String pMessage,
            java.lang.Throwable pThrowable)

Logs an error event with the specified message and Throwable

logDebug

public void logDebug(java.lang.String pMessage)

Logs an debug event with the specified message

logDebug

public void logDebug(java.lang.Throwable pThrowable)

Logs an debug event with the specified Throwable

logDebug

public void logDebug(java.lang.String pMessage,
            java.lang.Throwable pThrowable)

Logs an debug event with the specified message and Throwable