LightPIT: src/java/de/uapcore/lightpit/ModuleManager.java@da61a1646eba (annotated)

src/java/de/uapcore/lightpit/ModuleManager.java@da61a1646eba (annotated)

src/java/de/uapcore/lightpit/ModuleManager.java

Sun, 26 Nov 2017 18:09:23 +0100

author: Mike Becker <universe@uap-core.de>
date: Sun, 26 Nov 2017 18:09:23 +0100
changeset 6: da61a1646eba
child 7: 598670d5b0b8
permissions: -rw-r--r--

adds module manager

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2017 Mike Becker. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  *   1. Redistributions of source code must retain the above copyright
  *      notice, this list of conditions and the following disclaimer.
  *
  *   2. Redistributions in binary form must reproduce the above copyright
  *      notice, this list of conditions and the following disclaimer in the
  *      documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  * POSSIBILITY OF SUCH DAMAGE.
  *
  */
 package de.uapcore.lightpit;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import javax.servlet.ServletContext;
 import javax.servlet.ServletContextEvent;
 import javax.servlet.ServletContextListener;
 import javax.servlet.ServletRegistration;
 import javax.servlet.annotation.WebListener;
 /**
  * Scans registered servlets for LightPIT modules.
  */
 @WebListener
 public class ModuleManager implements ServletContextListener {
     private static final Logger LOG = Logger.getLogger(ModuleManager.class.getName());
     /**
      * The attribute name in the servlet context under which an instance of this class can be found.
      */
     public static final String SC_ATTR_NAME = ModuleManager.class.getName();
     private ServletContext sc;
     @Override
     public void contextInitialized(ServletContextEvent sce) {
         sc = sce.getServletContext();
         reloadAll();
         sc.setAttribute(SC_ATTR_NAME, this);
         LOG.info("Module manager injected into ServletContext.");
     }
     @Override
     public void contextDestroyed(ServletContextEvent sce) {
         assert sc != null && sc.equals(sce.getServletContext());
         sc.removeAttribute(SC_ATTR_NAME);
         unloadAll();
     }
     private boolean isRegisteredAsModule(ServletRegistration sr) {
         try {
             final Class scclass = Class.forName(sr.getClassName());
             return scclass.isAnnotationPresent(LightPITModule.class);
         } catch (ClassNotFoundException ex) {
             LOG.log(Level.SEVERE,
                     "Servlet registration refers to a class which cannot be found by the class loader: {0}",
                     sr.getClassName());
             return false;
         }
     }
     private void handleServletRegistration(String name, ServletRegistration sr) {
         if (isRegisteredAsModule(sr)) {
             LOG.log(Level.CONFIG, "Module detected: {0}", name);
         } else {
             LOG.log(Level.FINE, "Servlet {0} is no module, skipping.", name);
         }
     }
     /**
      * Scans for modules and reloads them all.
      */
     public void reloadAll() {
         sc.getServletRegistrations().forEach(this::handleServletRegistration);
         LOG.info("Modules loaded.");
     }
     /**
      * Unloads all found modules.
      */
     public void unloadAll() {
         LOG.info("All modules unloaded.");
     }
 }

Mercurial > hg > LightPIT / annotate

src/java/de/uapcore/lightpit/ModuleManager.java@da61a1646eba (annotated)

src/java/de/uapcore/lightpit/ModuleManager.java