uk.co.westhawk.servlet

Class Interfaces

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

uk.co.westhawk.servlet.Interfaces

All Implemented Interfaces:

java.io.Serializable, java.lang.Runnable, java.util.Observer, javax.servlet.Servlet, javax.servlet.ServletConfig

public class Interfaces
extends javax.servlet.http.HttpServlet
implements java.util.Observer, java.lang.Runnable

The Interfaces servlet collects information about all the interfaces on a SNMP server.

It will collect continuously information (depending on the update interval) unregarded it being accessed. It will start when the servlet is initialized (that is when the web server is started and loading all its servlets) until it is destroyed.

The following parameters should be configured when installing this servlet on a Java based webserver:
• HOST the hostname or IP address of the SNMP server, default localhost
• PORT the port number of the SNMP server, default 161
• INTERVAL the update interval, default 10 sec

When accessing this servlet (with a GET action) it will print its last updated information to your webpage. The servlet will respond quickly, since it already has the information. This information can easily be parsed so you can to combine it with an application.

In order to use a servlet you need to have a Java based webserver where you can add and removed servlets.

The benefit of an servlet is that:
• this servlet is the only one to collect this information
• every one (that is allowed by the web server) can access this information
• the network traffic will be kept low
• the chance of success is bigger, since a servlet has much more privileges than an application
• no application is needed if the servlet returns the information as (html) text

Version:

$Revision$ $Date$

Author:

Birgit Arkesteijn

See Also:

InterfaceGetNextPdu, getAllInterfaces, Serialized Form

Constructor Summary

Constructors

Constructor and Description
Interfaces()

Method Summary

Modifier and Type	Method and Description
void	destroy()
protected void	doGet(javax.servlet.http.HttpServletRequest req, javax.servlet.http.HttpServletResponse res)
java.lang.String	getHost()
java.lang.String	getInterval()
protected long	getLastModified(javax.servlet.http.HttpServletRequest req)
java.lang.String	getPort()
java.lang.String	getServletInfo()
void	init(javax.servlet.ServletConfig config)
protected void	letItBegin(javax.servlet.ServletConfig config)
void	run()
void	setHost(java.lang.String h)
void	setInterval(java.lang.String s) Set the update interval time in sec.
void	setPort(java.lang.String p)
protected void	showAllInterface(javax.servlet.http.HttpServletResponse res)
protected void	showAllInterface(javax.servlet.http.HttpServletResponse res, int index)
void	update(java.util.Observable obs, java.lang.Object ov)

Methods inherited from class javax.servlet.http.HttpServlet

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

Methods inherited from class javax.servlet.GenericServlet

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

Methods inherited from class java.lang.Object

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

Constructor Detail

Interfaces

public Interfaces()

Method Detail

init

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

Specified by:

init in interface javax.servlet.Servlet

Overrides:

init in class javax.servlet.GenericServlet

Throws:

javax.servlet.ServletException

destroy

public void destroy()

Specified by:

destroy in interface javax.servlet.Servlet

Overrides:

destroy in class javax.servlet.GenericServlet

doGet

protected void doGet(javax.servlet.http.HttpServletRequest req,
                     javax.servlet.http.HttpServletResponse res)
              throws javax.servlet.ServletException,
                     java.io.IOException

Overrides:

doGet in class javax.servlet.http.HttpServlet

Throws:

javax.servlet.ServletException

java.io.IOException

setHost

public void setHost(java.lang.String h)

setPort

public void setPort(java.lang.String p)

setInterval

public void setInterval(java.lang.String s)

Set the update interval time in sec.

getHost

public java.lang.String getHost()

getPort

public java.lang.String getPort()

getInterval

public java.lang.String getInterval()

letItBegin

protected void letItBegin(javax.servlet.ServletConfig config)
                   throws javax.servlet.ServletException

Throws:

javax.servlet.ServletException

getLastModified

protected long getLastModified(javax.servlet.http.HttpServletRequest req)

Overrides:

getLastModified in class javax.servlet.http.HttpServlet

run

public void run()

Specified by:

run in interface java.lang.Runnable

update

public void update(java.util.Observable obs,
                   java.lang.Object ov)

Specified by:

update in interface java.util.Observer

showAllInterface

protected void showAllInterface(javax.servlet.http.HttpServletResponse res)

showAllInterface

protected void showAllInterface(javax.servlet.http.HttpServletResponse res,
                                int index)

getServletInfo

public java.lang.String getServletInfo()

Specified by:

getServletInfo in interface javax.servlet.Servlet

Overrides:

getServletInfo in class javax.servlet.GenericServlet