How create a webscript that return the output progressively?












1














We have a really long process an we want to trigger that progress with a webscript's endpoint



But because it is too long with too many steps, we want to write in the body the steps accomplished and I want them to be display into the client browser meanwhile the are created.



I tried flushing the outputStream, but that doesn't render the output into the browser inmediatly. The browser waits until all the steps finish for displaying the output



public class ProgressiveProcessWebscript implements AbstractWebScript 
public final void execute(WebScriptRequest request,
WebScriptResponse response) {
...
response.setContentType(MIMETYPE_TXT);

OutputStream output = response.getOutputStream();
FilterOutputStream filterOutputStream = new FilterOutputStream(output);

for (Step step: stepList) {
step.execute();
filterOutputStream.write(step.getName().getBytes());
filterOutputStream.flush();
}


WebScriptResponse










share|improve this question





























    1














    We have a really long process an we want to trigger that progress with a webscript's endpoint



    But because it is too long with too many steps, we want to write in the body the steps accomplished and I want them to be display into the client browser meanwhile the are created.



    I tried flushing the outputStream, but that doesn't render the output into the browser inmediatly. The browser waits until all the steps finish for displaying the output



    public class ProgressiveProcessWebscript implements AbstractWebScript 
    public final void execute(WebScriptRequest request,
    WebScriptResponse response) {
    ...
    response.setContentType(MIMETYPE_TXT);

    OutputStream output = response.getOutputStream();
    FilterOutputStream filterOutputStream = new FilterOutputStream(output);

    for (Step step: stepList) {
    step.execute();
    filterOutputStream.write(step.getName().getBytes());
    filterOutputStream.flush();
    }


    WebScriptResponse










    share|improve this question



























      1












      1








      1







      We have a really long process an we want to trigger that progress with a webscript's endpoint



      But because it is too long with too many steps, we want to write in the body the steps accomplished and I want them to be display into the client browser meanwhile the are created.



      I tried flushing the outputStream, but that doesn't render the output into the browser inmediatly. The browser waits until all the steps finish for displaying the output



      public class ProgressiveProcessWebscript implements AbstractWebScript 
      public final void execute(WebScriptRequest request,
      WebScriptResponse response) {
      ...
      response.setContentType(MIMETYPE_TXT);

      OutputStream output = response.getOutputStream();
      FilterOutputStream filterOutputStream = new FilterOutputStream(output);

      for (Step step: stepList) {
      step.execute();
      filterOutputStream.write(step.getName().getBytes());
      filterOutputStream.flush();
      }


      WebScriptResponse










      share|improve this question















      We have a really long process an we want to trigger that progress with a webscript's endpoint



      But because it is too long with too many steps, we want to write in the body the steps accomplished and I want them to be display into the client browser meanwhile the are created.



      I tried flushing the outputStream, but that doesn't render the output into the browser inmediatly. The browser waits until all the steps finish for displaying the output



      public class ProgressiveProcessWebscript implements AbstractWebScript 
      public final void execute(WebScriptRequest request,
      WebScriptResponse response) {
      ...
      response.setContentType(MIMETYPE_TXT);

      OutputStream output = response.getOutputStream();
      FilterOutputStream filterOutputStream = new FilterOutputStream(output);

      for (Step step: stepList) {
      step.execute();
      filterOutputStream.write(step.getName().getBytes());
      filterOutputStream.flush();
      }


      WebScriptResponse







      java http spring-web






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 13 at 5:37

























      asked Nov 13 at 5:31









      Troncador

      1,77111437




      1,77111437
























          1 Answer
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          You can't simply write to the OutputStream and flush it. You must implement another concept. There is different solutions for your problem.



          You should take a look to this great post: What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?



          The Ajax Long Polling solution is in my opinion probably the easiest way, since you don't need any other framework server-side.






          share|improve this answer





















          • then there is no way to do it just with a simple http request?
            – Troncador
            Nov 13 at 23:24











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          You can't simply write to the OutputStream and flush it. You must implement another concept. There is different solutions for your problem.



          You should take a look to this great post: What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?



          The Ajax Long Polling solution is in my opinion probably the easiest way, since you don't need any other framework server-side.






          share|improve this answer





















          • then there is no way to do it just with a simple http request?
            – Troncador
            Nov 13 at 23:24
















          0














          You can't simply write to the OutputStream and flush it. You must implement another concept. There is different solutions for your problem.



          You should take a look to this great post: What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?



          The Ajax Long Polling solution is in my opinion probably the easiest way, since you don't need any other framework server-side.






          share|improve this answer





















          • then there is no way to do it just with a simple http request?
            – Troncador
            Nov 13 at 23:24














          0












          0








          0






          You can't simply write to the OutputStream and flush it. You must implement another concept. There is different solutions for your problem.



          You should take a look to this great post: What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?



          The Ajax Long Polling solution is in my opinion probably the easiest way, since you don't need any other framework server-side.






          share|improve this answer












          You can't simply write to the OutputStream and flush it. You must implement another concept. There is different solutions for your problem.



          You should take a look to this great post: What are Long-Polling, Websockets, Server-Sent Events (SSE) and Comet?



          The Ajax Long Polling solution is in my opinion probably the easiest way, since you don't need any other framework server-side.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 13 at 5:55









          LaurentG

          7,87573553




          7,87573553












          • then there is no way to do it just with a simple http request?
            – Troncador
            Nov 13 at 23:24


















          • then there is no way to do it just with a simple http request?
            – Troncador
            Nov 13 at 23:24
















          then there is no way to do it just with a simple http request?
          – Troncador
          Nov 13 at 23:24




          then there is no way to do it just with a simple http request?
          – Troncador
          Nov 13 at 23:24


















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