Hi Martin,
I have the same implementation as a servlet please find the servlet code i
used blow.
public class CometServlet extends HttpServlet implements CometProcessor {
protected ArrayList<HttpServletResponse> connections = new
ArrayList<HttpServletResponse>();
protected MessageSender messageSender = null;
public void init() throws ServletException {
messageSender = new MessageSender();
Thread messageSenderThread = new Thread(messageSender,
"MessageSender["
+ getServletContext().getContextPath() + "]");
messageSenderThread.setDaemon(true);
messageSenderThread.start();
}
public void destroy() {
connections.clear();
messageSender.stop();
messageSender = null;
}
@Override
public void service(ServletRequest arg0, ServletResponse arg1)
throws ServletException, IOException {
System.out.println("Inside service method");
super.service(arg0, arg1);
}
@Override
public void event(CometEvent event) throws IOException, ServletException
{
HttpServletRequest request = event.getHttpServletRequest();
HttpServletResponse response = event.getHttpServletResponse();
if (event.getEventType() == CometEvent.EventType.BEGIN) {
log("Begin for session: " + request.getSession(true).getId());
PrintWriter writer = response.getWriter();
writer
.println("<!doctype html public \"-//w3c//dtd html 4.0
transitional//en\">");
writer
.println("<head><title>JSP Chat</title></head><body
bgcolor=\"#FFFFFF\">");
writer.flush();
synchronized (connections) {
connections.add(response);
}
} else if (event.getEventType() == CometEvent.EventType.ERROR) {
log("Error for session: " + request.getSession(true).getId());
synchronized (connections) {
connections.remove(response);
}
event.close();
} else if (event.getEventType() == CometEvent.EventType.END) {
log("End for session: " + request.getSession(true).getId());
synchronized (connections) {
connections.remove(response);
}
PrintWriter writer = response.getWriter();
writer.println("</body></html>");
event.close();
} else if (event.getEventType() == CometEvent.EventType.READ) {
InputStream is = request.getInputStream();
byte[] buf = new byte[512];
do {
int n = is.read(buf); // can throw an IOException
if (n > 0) {
log("Read " + n + " bytes: " + new String(buf, 0, n)
+ " for session: "
+ request.getSession(true).getId());
} else if (n < 0) {
// error(event, request, response);
return;
}
} while (is.available() > 0);
}
}
public class MessageSender implements Runnable {
protected boolean running = true;
protected ArrayList<String> messages = new ArrayList<String>();
public MessageSender() {
}
public void stop() {
running = false;
}
/**
* Add message for sending.
*/
public void send(String user, String message) {
synchronized (messages) {
messages.add("[" + user + "]: " + message);
messages.notify();
}
}
public void run() {
while (running) {
if (messages.size() == 0) {
try {
synchronized (messages) {
messages.wait();
}
} catch (InterruptedException e) {
// Ignore
}
}
synchronized (connections) {
String[] pendingMessages = null;
synchronized (messages) {
pendingMessages = messages.toArray(new String[0]);
messages.clear();
}
// Send any pending message on all the open connections
for (int i = 0; i < connections.size(); i++) {
try {
PrintWriter writer =
connections.get(i).getWriter();
for (int j = 0; j < pendingMessages.length; j++)
{
writer.println(pendingMessages[j] + "<br>");
}
writer.flush();
} catch (IOException e) {
log("IOExeption sending message", e);
}
}
}
}
}
}
}
Please let me know if im doing anything wrong...
Thank you,
bala.
On Wed, May 6, 2009 at 7:05 PM, Martin Gainty <mgai...@hotmail.com> wrote:
>
> code Servlet to implement CometProcessor
> http://www.mbaworld.com/docs/aio.html
>
> Martin
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> > Date: Wed, 6 May 2009 18:37:23 +0530
> > Subject: comet with httpclient
> > From: chandu2...@gmail.com
> > To: users@tomcat.apache.org
> >
> > Hi All,
> >
> > Is it possible to use HttpClient as a client to comet servlet when i
> tried
> > a simple HttpClient the response is never returned back. below is my
> comet
> > client code...
> >
> > HttpClient httpclient = new DefaultHttpClient();
> > HttpGet httpget = new HttpGet("
> http://localhost:8080/serverpush/comet";);
> >
> > ResponseHandler<String> responseHandler = new
> BasicResponseHandler();
> > String responseBody = httpclient.execute(httpget, responseHandler);
> > httpclient.getConnectionManager().shutdown();
> >
> > if the above implementation is not preferred then what is the preferred
> > client for a comet servlet. could somebody point me to a link or doc on
> > comet client please. any help would be very much appreciated
> >
> > Thank you,
> > bala.
>
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