Add initial version of tapx-heroku

settings.gradle

@@ -1,3 +1,3 @@
 include "tapx-core", "tapx-kaptcha", "tapx-datefield", "tapx-plainmessage"
 include "tapx-templating", "tapx-yui"
-include "tapx-json", "tapx-jms-core"
+include "tapx-json", "tapx-jms-core", "tapx-heroku"

tapx-heroku/build.gradle

@@ -0,0 +1,14 @@
+description = "Common general components"
+
+versions = [
+        jetty : "8.0.3.v20111011",
+        mongo : "2.6.5"
+]
+
+dependencies {
+    compile "org.eclipse.jetty:jetty-webapp:$versions.jetty"
+    compile "org.eclipse.jetty:jetty-nosql:$versions.jetty"
+    compile "org.mongodb:mongo-java-driver:$versions.mongo"
+    compile "commons-cli:commons-cli:1.2"
+}
+

tapx-heroku/src/main/java/com/howardlewiship/tapx/heroku/JettyMain.java

@@ -0,0 +1,108 @@
+package com.howardlewiship.tapx.heroku;
+
+import com.mongodb.DB;
+import com.mongodb.MongoURI;
+import org.apache.commons.cli.*;
+import org.eclipse.jetty.nosql.mongodb.MongoSessionIdManager;
+import org.eclipse.jetty.nosql.mongodb.MongoSessionManager;
+import org.eclipse.jetty.server.Server;
+import org.eclipse.jetty.server.session.SessionHandler;
+import org.eclipse.jetty.webapp.WebAppContext;
+
+/**
+ * Launches Jetty to service the web application at {@code src/main/webapp}.
+ */
+public class JettyMain {
+
+    private final String webappFolder;
+
+    private final String mongoURLEnvVar;
+
+    private final String sessionCollectionName;
+
+    public JettyMain(String webappFolder, String mongoURLEnvVar, String sessionCollectionName) {
+        this.webappFolder = webappFolder;
+        this.mongoURLEnvVar = mongoURLEnvVar;
+        this.sessionCollectionName = sessionCollectionName;
+    }
+
+    public void startServer() throws Exception {
+
+        String webPort = System.getenv("PORT");
+        if (webPort == null || webPort.isEmpty()) {
+            webPort = "8080";
+        }
+
+        Server server = new Server(Integer.valueOf(webPort));
+        WebAppContext root = new WebAppContext();
+
+        MongoURI mongoURI = new MongoURI(System.getenv(mongoURLEnvVar));
+        DB connectedDB = mongoURI.connectDB();
+
+        if (mongoURI.getUsername() != null) {
+            connectedDB.authenticate(mongoURI.getUsername(), mongoURI.getPassword());
+        }
+
+        MongoSessionIdManager idMgr = new MongoSessionIdManager(server, connectedDB.getCollection(sessionCollectionName));
+
+        server.setSessionIdManager(idMgr);
+
+        SessionHandler sessionHandler = new SessionHandler();
+        MongoSessionManager mongoMgr = new MongoSessionManager();
+        mongoMgr.setSessionIdManager(server.getSessionIdManager());
+        sessionHandler.setSessionManager(mongoMgr);
+
+        root.setSessionHandler(sessionHandler);
+        root.setContextPath("/");
+        root.setDescriptor(webappFolder + "/WEB-INF/web.xml");
+        root.setResourceBase(webappFolder);
+        root.setParentLoaderPriority(true);
+
+        server.setHandler(root);
+
+        server.start();
+        server.join();
+    }
+
+    public static void main(String[] args) throws Exception {
+
+        CommandLineParser parser = new PosixParser();
+
+        Options options = new Options();
+        options.addOption("w", "web-app-folder", true, "Root folder of web application");
+        options.addOption("m", "mongo-env-var", true, "Name of environment variable storing the MongoDB URL");
+        options.addOption("c", "session-collection", true, "Name of MongoDB collection storing session data");
+        options.addOption("h", "help", false, "Show command usage");
+
+        try {
+            CommandLine commandLine = parser.parse(options, args, true);
+
+            if (!commandLine.getArgList().isEmpty()) {
+                throw new ParseException("Unexpected command line arguments.");
+            }
+
+            if (commandLine.hasOption("help")) {
+                showHelp(options);
+                System.exit(0);
+            }
+
+            JettyMain main = new JettyMain(
+                    commandLine.getOptionValue("web-app-folder", "src/main/webapp"),
+                    commandLine.getOptionValue("mongo-env-var", "MONGOHQ_URL"),
+                    commandLine.getOptionValue("session-collection", "sessions"));
+            main.startServer();
+
+        } catch (ParseException ex) {
+            System.err.println(ex.getMessage());
+            showHelp(options);
+            System.exit(-1);
+        }
+
+    }
+
+    private static void showHelp(Options options) {
+        HelpFormatter helpFormatter = new HelpFormatter();
+        helpFormatter.printHelp(JettyMain.class.getName(), options);
+    }
+
+}