/**
* Issue a probe request to remoteip:remoteport. If the server does not respond, remove it from
* SimpleDB.
*
* @return
*/
private boolean probe(Server s) {
if (RPCClient.probe(s)) {
System.out.println(s + " Active");
return true;
} else {
System.out.println(s + " Inactive");
sdb.deleteAttributes(new DeleteAttributesRequest(simpleDBDomain, s.toString()));
System.out.println(s + " Removed");
return false;
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// Set response objects
response.setContentType("text/html");
PrintWriter out = response.getWriter();
// Load session from cookie or create new one if doesn't exist
Session session = SessionManager.getAndIncrement(request);
String message = session.getMessage();
Integer count = session.getChangecount();
// Initialize message
if (message == null) {
message = "Hello World!";
}
// Initialize count or increment
if (count == null) {
count = 1;
} else {
count = new Integer(1 + count);
}
// Check user submission command
String cmd = request.getParameter("cmd");
if (cmd != null) {
if (cmd.equals("Replace")) {
message = request.getParameter("replace_text");
} else if (cmd.equals("LogOut")) {
// Do something different on logout
SessionManager.destroyCookie(request, response);
out.println("<!DOCTYPE html>");
out.println("<html><head></head><body>");
out.println("<h2>Bye!</h2>");
out.println("</body></html>");
return;
} else if (cmd.equals("Refresh Membership")) {
gm.refreshMembers();
} else if (cmd.equals("Server Crash")) {
gm.setRunning(false);
rpcServer.setRunning(false);
}
}
// Write changed variables back to session
session.setMessage(message);
session.setChangecount(count);
RPCClient.sessionWrite(session.getSID(), session.getChangecount(), session.getExpiration());
// Write back cookie
SessionManager.putCookie(response, session);
// Output HTML to page
out.println("<!DOCTYPE html>");
out.println("<html><head></head><body>");
out.println("<h2>(" + count.toString() + ") " + message + "</h2>");
out.println("<form method=\"post\">");
out.println(
"<div><input type=\"submit\" value=\"Replace\" name=\"cmd\" /><input type=\"text\" name=\"replace_text\" /></div>");
out.println("<div><input type=\"submit\" value=\"Refresh\" name=\"cmd\" /></div>");
out.println("<div><input type=\"submit\" value=\"LogOut\" name=\"cmd\" /></div>");
out.println("<div><input type=\"submit\" value=\"Refresh Membership\" name=\"cmd\" /></div>");
out.println("<div><input type=\"submit\" value=\"Server Crash\" name=\"cmd\" /></div>");
out.println("</form>");
out.println("<h3>Server: " + localServer + "</h3>");
out.println("<h3>Session: " + session + "</h3>");
out.println("<h3>MbrSet: </h3><ul>");
for (Server s : gm.getMbrSet()) {
out.println("<li>" + s.toString() + "</li>");
}
out.println("</ul>");
out.println("</body></html>");
}