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

Sat, 09 May 2020 17:01:29 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 09 May 2020 17:01:29 +0200
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cleanup and simplification of database access layer

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2018 Mike Becker. All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 *
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28 */
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29 package de.uapcore.lightpit;
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30
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31 import de.uapcore.lightpit.entities.Module;
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32 import org.slf4j.Logger;
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33 import org.slf4j.LoggerFactory;
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34
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35 import javax.servlet.Registration;
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36 import javax.servlet.ServletContext;
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37 import javax.servlet.ServletContextEvent;
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38 import javax.servlet.ServletContextListener;
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39 import javax.servlet.annotation.WebListener;
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40 import java.sql.Connection;
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41 import java.sql.SQLException;
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42 import java.util.*;
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43 import java.util.concurrent.atomic.AtomicBoolean;
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44 import java.util.stream.Collectors;
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45
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46 /**
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47 * Scans registered servlets for LightPIT modules.
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48 */
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49 @WebListener
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50 public final class ModuleManager implements ServletContextListener {
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51
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52 private static final Logger LOG = LoggerFactory.getLogger(ModuleManager.class);
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53
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54 /**
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55 * The attribute name in the servlet context under which an instance of this class can be found.
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56 */
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57 public static final String SC_ATTR_NAME = ModuleManager.class.getName();
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58 private ServletContext sc;
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59
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60 /**
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61 * Maps class names to module information.
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62 */
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63 private final Map<String, LightPITModule> registeredModules = new HashMap<>();
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64
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65 /**
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66 * This flag is true, when synchronization is needed.
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67 */
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68 private final AtomicBoolean dirty = new AtomicBoolean(true);
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69
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70 @Override
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71 public void contextInitialized(ServletContextEvent sce) {
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72 sc = sce.getServletContext();
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73 reloadAll();
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74 sc.setAttribute(SC_ATTR_NAME, this);
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75 LOG.info("Module manager injected into ServletContext.");
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76 }
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77
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78 @Override
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79 public void contextDestroyed(ServletContextEvent sce) {
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80 unloadAll();
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81 }
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82
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83 private Optional<LightPITModule> getModuleInfo(Registration reg) {
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84 try {
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85 final Class<?> scclass = Class.forName(reg.getClassName());
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86
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87 final boolean lpservlet = AbstractLightPITServlet.class.isAssignableFrom(scclass);
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88 final boolean lpmodule = scclass.isAnnotationPresent(LightPITModule.class);
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89
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90 if (lpservlet && !lpmodule) {
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91 LOG.warn(
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92 "{} is a LightPIT Servlet but is missing the module annotation.",
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93 reg.getClassName()
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94 );
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95 } else if (!lpservlet && lpmodule) {
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96 LOG.warn(
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97 "{} is annotated as a LightPIT Module but does not extend {}.",
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98 reg.getClassName(),
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99 AbstractLightPITServlet.class.getSimpleName()
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100 );
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101 }
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102
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103 if (lpservlet && lpmodule) {
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104 final LightPITModule moduleInfo = scclass.getAnnotation(LightPITModule.class);
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105 return Optional.of(moduleInfo);
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106 } else {
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107 return Optional.empty();
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108 }
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109 } catch (ClassNotFoundException ex) {
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110 LOG.error(
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111 "Servlet registration refers to class {} which cannot be found by the class loader (Reason: {})",
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112 reg.getClassName(),
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113 ex.getMessage()
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114 );
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115 return Optional.empty();
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116 }
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117 }
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118
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119 private void handleServletRegistration(String name, Registration reg) {
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120 final Optional<LightPITModule> moduleInfo = getModuleInfo(reg);
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121 if (moduleInfo.isPresent()) {
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122 registeredModules.put(reg.getClassName(), moduleInfo.get());
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123 LOG.info("Module detected: {}", name);
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124 } else {
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125 LOG.debug("Servlet {} is no module, skipping.", name);
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126 }
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127 }
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128
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129 /**
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130 * Scans for modules and reloads them all.
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131 */
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132 public void reloadAll() {
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133 registeredModules.clear();
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134 sc.getServletRegistrations().forEach(this::handleServletRegistration);
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135
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136 // TODO: implement dependency resolver
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137
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138 dirty.set(true);
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139 LOG.info("Modules loaded.");
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140 }
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141
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142 /**
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143 * Synchronizes module information with the database.
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144 * <p>
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145 * This must be called from the {@link AbstractLightPITServlet}.
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146 * Admittedly the call will perform the synchronization once after reload
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147 * and be a no-op, afterwards.
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148 * However, since the DatabaseFacade might be loaded after the module
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149 * manager, we must defer the synchronization to the first request
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150 * handled by the Servlet.
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151 *
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152 * @param db interface to the database
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153 */
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154 public void syncWithDatabase(DatabaseFacade db) {
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155 if (dirty.compareAndSet(true, false)) {
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156 if (db.getDataSource().isPresent()) {
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157 try (Connection conn = db.getDataSource().get().getConnection()) {
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158 db.getDataAccessObjects()
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159 .getModuleDao()
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160 .syncRegisteredModuleClasses(conn, registeredModules.entrySet());
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161 } catch (SQLException ex) {
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162 LOG.error("Unexpected SQL Exception", ex);
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163 }
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164 } else {
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165 LOG.error("No datasource present. Cannot sync module information with database.");
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166 }
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167 } else {
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168 LOG.trace("Module information clean - no synchronization required.");
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169 }
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170 }
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171
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172 /**
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173 * Unloads all found modules.
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174 */
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175 public void unloadAll() {
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176 registeredModules.clear();
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177 LOG.info("All modules unloaded.");
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178 }
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179
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180 /**
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181 * Returns the main menu.
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182 *
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183 * @param db the interface to the database
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184 * @return a list of menus belonging to the main menu
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185 */
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186 public List<Menu> getMainMenu(DatabaseFacade db) {
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187 // TODO: user specific menu
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188
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189 if (db.getDataSource().isPresent()) {
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190 try (Connection conn = db.getDataSource().get().getConnection()) {
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191 final List<Module> modules = db.getDataAccessObjects().getModuleDao().list(conn);
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192
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193 return modules
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194 .stream()
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195 .filter(Module::isVisible)
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196 .sorted(new Module.PriorityComparator())
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197 .map(mod -> new Menu(
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198 mod.getClassname(),
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199 new ResourceKey(
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200 registeredModules.get(mod.getClassname()).bundleBaseName(),
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201 registeredModules.get(mod.getClassname()).menuKey()),
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202 registeredModules.get(mod.getClassname()).modulePath()))
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203 .collect(Collectors.toList());
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204 } catch (SQLException ex) {
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205 LOG.error("Unexpected SQLException when loading the main menu", ex);
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206 return Collections.emptyList();
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207 }
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208 } else {
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209 return Collections.emptyList();
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210 }
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211 }
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212
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213 /**
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214 * Returns an unmodifiable map of all registered modules.
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215 * <p>
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216 * The key is the classname of the module.
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217 *
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218 * @return the map of registered modules
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219 */
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220 public Map<String, LightPITModule> getRegisteredModules() {
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221 return Collections.unmodifiableMap(registeredModules);
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222 }
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223 }

mercurial