Re: tiniest SQL + tiniest app-server

=?ISO-8859-1?Q?Arne_Vajh=F8j?= <>
Mon, 11 Jan 2010 22:16:14 -0500
On 08-01-2010 00:16, tnorgd wrote:

I have a command-line based java program that does a lot of stuff and
its single run take a couple of days. I would like to monitor its
progress in a way smarter than just reading output text file.

I would like to make it writing to a SQL database, then I could look
on charts through a web browser. I run tests on my laptop, so I would
need the smallest possible SQL database. Idealy a single jar file I
could launch in a terminal. Moreover I need a webserwer, preferably
also a single jar.

I am sure there is such stuff already waiting to be used...

There are plenty of embedded databases to pick from
Cloudscape/Derby/JavaDB, Hypersonic SQL/HSQLDB/H2,
BDB Java edition, McKoi etc..

HTTP server is a different animal though. In general I am
rather happy with Tomcat, but I think that Jetty may be
better for embedded purpose.

document how easy it is.

Attached below is my own small demo example. It does not
get much simpler than that.



import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.eclipse.jetty.server.Request;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.handler.AbstractHandler;

public class WebServer extends AbstractHandler {
     private Map<String, Integer> counter = new HashMap<String, Integer>();
     public void handle(String target, Request req, HttpServletRequest
httpreq, HttpServletResponse httpresp) throws IOException,
ServletException {
         int n;
         String path = httpreq.getPathInfo();
         if(counter.containsKey(path)) {
             n = counter.get(path) + 1;
         } else {
             n = 1;
         PrintWriter pw = httpresp.getWriter();
         pw.println("<title>Hit counter</title>");
         pw.println("<h1>Hit counter</h1>");
         pw.println("<p>" + path + " has " + n + " hits</p>");
         counter.put(path, n);
     public static void main(String[] args) throws Exception {
         Server server = new Server(8080);
         server.setHandler(new WebServer());

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