I went ahead and added an example to the Embedded Jetty Cookbook.
https://github.com/jetty-project/embedded-jetty-cookbook/blob/master/src/main/java/org/eclipse/jetty/cookbook/DelayedWebAppDeployExample.java
That explains how to accomplish what you need.
Joakim Erdfelt / joa...@webtide.com
On Mon, Oct 7, 2019 at 9:36 AM Bill Ross <r...@cgl.ucsf.edu> wrote:
> (and return after the 503)
>
>
> On 10/7/19 7:35 AM, Bill Ross wrote:
> > Would anything like these chunks from my code work for you? The secret
> > is checking status in doGet().
> >
> >
> > public class GetMult extends HttpServlet {
> >
> > private ServletData servletData;
> >
> > public void init(ServletConfig config) throws ServletException {
> >
> > servletData = ServletData.get(); // singleton
> >
> > }
> >
> > @Override
> > public void doGet(HttpServletRequest req, HttpServletResponse res)
> > throws ServletException, IOException {
> >
> > if (!servletData.isReady()) {
> >
> > res.sendError(503, "Put another quarter million in the
> > slot");
> >
> > }
> >
> > // do it
> >
> > }
> >
> > }
> >
> > public class ServletData {
> >
> > private static Logger log =
> > LoggerFactory.getLogger(ServletData.class);
> >
> > // calling the constructor here hangs sync on the parallel loads
> > // for some reason
> > private static ServletData single = null;
> >
> > public static ServletData get() {
> > synchronized(ServletData.class) {
> > if (single == null) {
> > single = new ServletData();
> > }
> > }
> > return single;
> > }
> >
> > private ServletData() {
> >
> > Thread th1 = new Thread(new Runnable() {
> > public void run() {
> > try {
> > approvedV =
> > ApprovalDao.getAllApprovedPairs(fconn, 1,
> > "v", null,
> > true, // d0
> > null, null,
> > null);
> > } catch (SQLException sqe) {
> > log.error("approvedV: " + sqe);
> > System.exit(1);
> > }
> > }
> > });
> > th1.start();
> >
> > }
> >
> > public isReady() {
> >
> > return approvedV != null;
> >
> > }
> >
> > }
> >
> > On 10/7/19 5:34 AM, Dirk Olmes wrote:
> >> On 10/7/19 11:21 AM, Bill Ross wrote:
> >>> Why not have a ContextHandler that starts a setup thread on init, and
> >>> answers 503 until that thread is done?
> >> That's sort of what I currently do (starting a setup thread from the
> >> main servlet's init method) but that causes all kinds of trouble because
> >> the servlet context accepts requests before all the app logic is ready.
> >>
> >> Based on your suggestion combined with Greg's before I came up with this
> >> approach: Register a ContextHandler that answers 503 and let the server
> >> start normally. After the server is started I launch the setup thread
> >> where I register the real app context with the server and manually send
> >> it a start(). After the context is started I unregister the
> >> ContextHandler that answers 503.
> >>
> >> The code is here:
> >>
> https://github.com/dirk-olmes/jetty-delayed-context-startup/tree/deferred_context_startup
> >>
> >>
> >> Ok, this approach works. But I was hoping that Jetty supported something
> >> like that out of the box.
> >>
> >> -dirk
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