org.xmlBlaster.contrib.htmlmonitor
Class HtmlMonitorPlugin

java.lang.Object
  org.xmlBlaster.contrib.htmlmonitor.HtmlMonitorPlugin

All Implemented Interfaces:

I_HttpRequest, I_Plugin

public class HtmlMonitorPlugin
extends java.lang.Object
implements I_Plugin, I_HttpRequest

HtmlMonitorPlugin is a native plugin to build simple HTML monitoring pages.

The HTML pages are available over the tiny xmlBlaster HTTP server.

This plugin needs to be registered in xmlBlasterPlugins.xml to be available on xmlBlaster server startup.

<plugin id='HtmlMonitorPlugin.MyCompany' className='org.xmlBlaster.contrib.htmlmonitor.HtmlMonitorPlugin'>
   <attribute id='urlPath'>/monitor</attribute>
   <attribute id='documentRoot'>${user.home}${file.separator}html</attribute>
   <attribute id='urlPath.CLASSPATH'>/status.html</attribute>
   <action do='LOAD' onStartupRunlevel='9' sequence='6' onFail='resource.configuration.pluginFailed'/>
   <action do='STOP' onShutdownRunlevel='6' sequence='5'/>
</plugin>
 

Setting urlPath to /monitor and documentRoot to /home/xmlblast/html and invoking in the browser http://localhost:3412/monitor/x.html will lookup /home/xmlblast/html/x.html

This plugin uses java.util.logging and redirects the logging to xmlBlasters default logging framework. You can switch this off by setting the attribute xmlBlaster/jdk14loggingCapture to false.

Author:

Marcel Ruff

Field Summary

private CommandManager	commandManager
private java.lang.String	documentRoot
private ServerScope	global
private HttpIORServer	httpServer
private static java.util.logging.Logger	log
private java.util.Map	mimeTypes
private PluginInfo	pluginInfo
private ReplaceVariable	replaceVariable
private java.util.Set	urlPathClasspathSet

Constructor Summary

HtmlMonitorPlugin()
Default constructor, you need to call init() thereafter.

Method Summary

java.lang.String	get(java.lang.String key, java.lang.String def) Access a property.
private java.lang.String	getMimeType(java.lang.String fileName)
java.lang.String	getType() The plugin name as configured im xmlBlasterPlugins.xml
java.lang.String	getVersion() The plugin version as configured in xmlBlasterPlugins.xml
void	init(Global global_, PluginInfo pluginInfo) This method is called by the PluginManager.
private void	invokeAction(java.lang.String parameter) Checks for parameter in the URL and if it contains an invokeAction part, it starts this action.
private java.lang.String	lookup(java.lang.String query) Lookup the given administrative command.
private java.lang.String	replaceAllVariables(java.lang.String template) Replace ${...} occurrences.
HttpResponse	service(java.lang.String urlPath, java.util.Map properties) A HTTP request needs to be processed
void	shutdown() Cleans up the resource.

Methods inherited from class java.lang.Object

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

Field Detail

log

private static java.util.logging.Logger log

global

private ServerScope global

pluginInfo

private PluginInfo pluginInfo

httpServer

private HttpIORServer httpServer

urlPathClasspathSet

private java.util.Set urlPathClasspathSet

documentRoot

private java.lang.String documentRoot

commandManager

private CommandManager commandManager

replaceVariable

private ReplaceVariable replaceVariable

mimeTypes

private java.util.Map mimeTypes

Constructor Detail

HtmlMonitorPlugin

public HtmlMonitorPlugin()

Default constructor, you need to call init() thereafter.

Method Detail

init

public void init(Global global_,
                 PluginInfo pluginInfo)
          throws XmlBlasterException

Description copied from interface: I_Plugin

This method is called by the PluginManager.

Example how options are evaluated:

   // An entry in xmlBlaster.properties (in one line):
   MimeSubscribePlugin[ContentLenFilter][1.0]=\
                 org.xmlBlaster.engine.mime.demo.ContentLenFilter,\
                 DEFAULT_MAX_LEN=200,DEFAULT_MIN_LEN=20

  // Access it like this:
  java.util.Properties props = pluginInfo.getParameters();
  String maxLen = (String)props.get("DEFAULT_MAX_LEN");
  String throwLen = (String)props.get("THROW_EXCEPTION_FOR_LEN");
 

Specified by:

init in interface I_Plugin

Throws:

XmlBlasterException

See Also:

I_Plugin.init(org.xmlBlaster.util.Global, org.xmlBlaster.util.plugin.PluginInfo)

getType

public java.lang.String getType()

The plugin name as configured im xmlBlasterPlugins.xml

Specified by:

getType in interface I_Plugin

See Also:

I_Plugin.getType()

getVersion

public java.lang.String getVersion()

The plugin version as configured in xmlBlasterPlugins.xml

Specified by:

getVersion in interface I_Plugin

See Also:

I_Plugin.getVersion()

getMimeType

private java.lang.String getMimeType(java.lang.String fileName)

service

public HttpResponse service(java.lang.String urlPath,
                            java.util.Map properties)

A HTTP request needs to be processed

Specified by:

service in interface I_HttpRequest

Parameters:

urlPath - The url path like "/monitor/show.html" or "/status.html" which triggered this call contains the real file name as given in the browser window including the leading slash '/'.

properties - The key values from the browser

Returns:

The HTML page to return

invokeAction

private void invokeAction(java.lang.String parameter)

Checks for parameter in the URL and if it contains an invokeAction part, it starts this action.

Parameters:

parameter - contains the parameter given in the URL.

replaceAllVariables

private java.lang.String replaceAllVariables(java.lang.String template)
                                      throws XmlBlasterException

Replace ${...} occurrences.

Parameters:

template - The template text containing ${}

Returns:

The result text with replaced ${}

Throws:

XmlBlasterException

lookup

private java.lang.String lookup(java.lang.String query)
                         throws XmlBlasterException

Lookup the given administrative command.

Returns:

The result of the command

Throws:

XmlBlasterException

shutdown

public void shutdown()
              throws XmlBlasterException

Description copied from interface: I_Plugin

Cleans up the resource.

Specified by:

shutdown in interface I_Plugin

Throws:

XmlBlasterException - if an exception occurs. The exception is handled by the RunLevelManager depending on how the plugin has been configured with the action:

<action do='STOP' onShutdownRunlevel='2' sequence='5' onFail='resource.configuration.pluginFailed'> If onFail is defined to something, the RunLevelManager will stop.

See Also:

I_Plugin.shutdown()

get

public java.lang.String get(java.lang.String key,
                            java.lang.String def)

Access a property.

Parameters:

key - The key to lookup

def - The default to return if key is not found

Returns:

The found value