com.oldlight.weaver.appservlet
Class WeaverApplicationServlet

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          com.oldlight.weaver.appservlet.WeaverApplicationServlet

All Implemented Interfaces:

Serializable, Servlet, ServletConfig

public class WeaverApplicationServlet

extends HttpServlet

The servlet for Weaver applications. When the servlet starts up it goes through the following initialisation actions:

• Turns on all logging and logs to the stderr. This persists until logging configuration information has been read.
• Retrieves the name of the application from Servlet (via getServletName). This value will later be used as the section name to look up config values.
• Loads configuration information from the Servlet config file (web.xml) and associated servlet context.
• Uses the configuration read to find the value of the CONFIG_FILE setting. If found it is assumed to be a "ini" style file and the configuration information is from this file is added.
• Logging is then reconfigured based on the configuration information read (see com.neverware.utils.Logger).
• Logs details of the current Java environment.
• Creates a Weaver instance to read the application definition file (as specified in the configuration by DEFINITION_FILE setting) and build the application as directed.
• Calls all loaded Weaver Beans init methods
• Run the application initialisation WAD section.
  The servlet then waits for incoming requests which is serves via the Weaver application built in the initialisation phase.

  Author:

  Paul Harvey

  See Also:

  Serialized Form

  Nested Class Summary

  private class

  WeaverApplicationServlet.Reloader

  Field Summary

  private WeaverApplication	application
  static String	CONFIG_DIR_PREFIX
  static String	CONFIG_DIR_SUFFIX
  static String	CONFIG_FILE_NAME
  static String	CONFIG_PARAM_DO_RELOADS
  private boolean	doReloads
  private boolean	firstInit
  private static String	IIW_PARAM
  private static String	IIW_PARAM_VALUE
  private String	iniFile
  private boolean	initOK
  private Logger	l
  private long	lastLoaded
  private Exception	notOKReason
  private Properties	properties
  private Thread	reloadThread
  private boolean	reloadThreadStopping
  private WeaverServletContextImpl	servletContext
  private String	uploadDir
  static String	WAD_FILE_NAME
  private String	wadFile

  Fields inherited from class javax.servlet.http.HttpServlet

  Fields inherited from class javax.servlet.GenericServlet

  Constructor Summary

  WeaverApplicationServlet()
  

  Method Summary

  private void	checkReload()
  protected void	clientInit()
  void	destroy() Called by the serlvet engine to destroy the servlet.
  void	doGet(HttpServletRequest the_request, HttpServletResponse the_response) Called by the servlet engine to handle a HTTP get.
  private void	doGetPost(HttpServletRequest theRequest, HttpServletResponse theResponse)
  void	doPost(HttpServletRequest the_request, HttpServletResponse the_response) Called by the servlet engine to handle a HTTP post
  String	getServletInfo()
  void	init() Called once by the servlet engine to initialise the servlet.
  private void	reportInitFailure(HttpServletResponse theResponse)
  private void	sayItsWeaver(HttpServletResponse response)

  Methods inherited from class javax.servlet.http.HttpServlet

  doDelete, doHead, doOptions, doPut, doTrace, getLastModified, 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

  Field Detail

  CONFIG_DIR_PREFIX

  public static final String CONFIG_DIR_PREFIX

  See Also:

  Constant Field Values

  CONFIG_DIR_SUFFIX

  public static final String CONFIG_DIR_SUFFIX

  See Also:

  Constant Field Values

  CONFIG_FILE_NAME

  public static final String CONFIG_FILE_NAME

  See Also:

  Constant Field Values

  WAD_FILE_NAME

  public static final String WAD_FILE_NAME

  See Also:

  Constant Field Values

  CONFIG_PARAM_DO_RELOADS

  public static final String CONFIG_PARAM_DO_RELOADS

  See Also:

  Constant Field Values

  l

  private Logger l

  properties

  private Properties properties

  application

  private WeaverApplication application

  servletContext

  private WeaverServletContextImpl servletContext

  lastLoaded

  private long lastLoaded

  firstInit

  private boolean firstInit

  reloadThread

  private Thread reloadThread

  reloadThreadStopping

  private boolean reloadThreadStopping

  wadFile

  private String wadFile

  iniFile

  private String iniFile

  initOK

  private boolean initOK

  notOKReason

  private Exception notOKReason

  doReloads

  private boolean doReloads

  uploadDir

  private String uploadDir

  IIW_PARAM

  private static final String IIW_PARAM

  See Also:

  Constant Field Values

  IIW_PARAM_VALUE

  private static final String IIW_PARAM_VALUE

  See Also:

  Constant Field Values

  Constructor Detail

  WeaverApplicationServlet

  public WeaverApplicationServlet()

  Method Detail

  getServletInfo

  public String getServletInfo()

  doGet

  public void doGet(HttpServletRequest the_request,
                    HttpServletResponse the_response)
             throws ServletException

  Called by the servlet engine to handle a HTTP get.

  Parameters:

  the_request - The request object.

  the_response - The response object.

  Throws:

  ServletException

  doPost

  public void doPost(HttpServletRequest the_request,
                     HttpServletResponse the_response)
              throws ServletException

  Called by the servlet engine to handle a HTTP post

  Parameters:

  the_request - The request object.

  the_response - The response object.

  Throws:

  ServletException

  init

  public void init()
            throws ServletException

  Called once by the servlet engine to initialise the servlet. init attempts to read configuration information from the servlet itself, from a conf file (windows INI style) indicated in the servlet configuration and then from the database as indicated either in the servlet properties or conf file.

  It then creates a Weaver object based on the read configuration - most importantly a Weaver application definition file. Finally the application initialisation bean are executed.

  Throws:

  ServletException

  clientInit

  protected void clientInit()
                     throws WeaverException

  Throws:

  WeaverException

  sayItsWeaver

  private void sayItsWeaver(HttpServletResponse response)
                     throws IOException

  Throws:

  IOException

  checkReload

  private void checkReload()
                    throws ServletException

  Throws:

  ServletException

  reportInitFailure

  private void reportInitFailure(HttpServletResponse theResponse)

  doGetPost

  private void doGetPost(HttpServletRequest theRequest,
                         HttpServletResponse theResponse)
                  throws ServletException

  Throws:

  ServletException

  destroy

  public void destroy()

  Called by the serlvet engine to destroy the servlet.