--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/artifact-database/src/main/java/org/dive4elements/artifactdatabase/rest/Standalone.java	Thu Apr 25 10:57:18 2013 +0200
@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2010 by Intevation GmbH
+ *
+ * This program is free software under the LGPL (>=v2.1)
+ * Read the file LGPL.txt coming with the software for details
+ * or visit http://www.gnu.org/licenses/ if it does not exist.
+ */
+
+package de.intevation.artifactdatabase.rest;
+
+import de.intevation.artifacts.common.utils.XMLUtils;
+
+import de.intevation.artifacts.ArtifactDatabase;
+
+import org.apache.log4j.Logger;
+
+import org.restlet.Component;
+import org.restlet.Server;
+
+import org.restlet.data.Protocol;
+
+import org.w3c.dom.Document;
+
+/**
+ * Starts an HTTP server bound to a RestApp.
+ * The server (binding interface and port) is configure via the
+ * global configuration.
+ *
+ * @author <a href="mailto:sascha.teichmann@intevation">Sascha L. Teichmann</a>
+ */
+public class Standalone
+implements   HTTPServer
+{
+    private static Logger logger = Logger.getLogger(Standalone.class);
+
+    /**
+     * XPath to figure out the port where to listen from the
+     * global configuration.
+     */
+    public static final String REST_PORT =
+        "/artifact-database/rest-server/port/text()";
+
+    /**
+     * XPath to figure out from global configuration
+     * which network interface to use to bind the HTTP server.
+     */
+    public static final String LISTEN_INTERFACE =
+        "/artifact-database/rest-server/listen/text()";
+
+    /**
+     * The default port of the HTTP server: 8181
+     */
+    public static final int DEFAULT_PORT = 8181;
+
+    public static final String MAX_THREADS =
+        "/artifact-database/rest-server/max-threads/text()";
+
+    public static final String MAX_THREADS_DEFAULT =
+        "1024";
+
+    protected int     port;
+
+    protected String  listen;
+
+    protected String  maxThreads;
+
+    public Standalone() {
+    }
+
+    @Override
+    public void setup(Document document) {
+        String portString = XMLUtils.xpathString(document, REST_PORT, null);
+
+        port = DEFAULT_PORT;
+
+        if (portString != null) {
+            try {
+                port = Integer.parseInt(portString);
+                if (port < 0) {
+                    throw new NumberFormatException();
+                }
+            }
+            catch (NumberFormatException nfe) {
+                logger.error("rest port is not a positive integer value.", nfe);
+                return;
+            }
+        }
+
+        listen     = XMLUtils.xpathString(document, LISTEN_INTERFACE, null);
+        maxThreads = XMLUtils.xpathString(document, MAX_THREADS, null);
+    }
+
+    protected Server createServer() {
+        return listen != null && listen.length() > 0
+            ? new Server(Protocol.HTTP, listen, port)
+            : new Server(Protocol.HTTP, port);
+    }
+
+    protected void logServerStart() {
+        logger.info("Starting " + getClass().getName() + " HTTP server on "
+            + (listen != null ? listen : "*")
+            + ":" + port);
+    }
+
+    /**
+     * Builds a RestApp wrapped around the given artifact database,
+     * and bind this application to HTTP server. The HTTP server
+     * is configured by the global configuration. If no port is
+     * given by the configuration the default port is used. If
+     * no interface is given the HTTP server is reachable from
+     * all interfaces.
+     * @param db The artifact database to be exposed via the
+     * REST application.
+     */
+    @Override
+    public void startAsServer(ArtifactDatabase db) {
+
+        RestApp app = new RestApp(db);
+
+        Component component = new Component();
+
+        Server server = createServer();
+
+        component.getServers().add(server);
+
+        server.getContext().getParameters().add(
+            "maxThreads", maxThreads != null && maxThreads.length() > 0
+                ? maxThreads
+                : MAX_THREADS_DEFAULT);
+
+        component.getDefaultHost().attach(app);
+
+        logServerStart();
+
+        try {
+            component.start();
+        }
+        catch (Exception e) {
+            logger.error(e.getLocalizedMessage(), e);
+        }
+    }
+}
+// vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :