java - Spring boot integration url pagination solution -


i using spring (boot) integration in order connect restful webservice , retrieve data that, here part of codes: 

@bean public pollermetadata downloadtrigger() {     periodictrigger trigger = new periodictrigger(config.getdownloadinterval());     trigger.setfixedrate(true);     pollermetadata pollermetadata = new pollermetadata();     pollermetadata.settrigger(trigger);     pollermetadata.setmaxmessagesperpoll(1);     return pollermetadata; }  @bean(name = pollermetadata.default_poller) public pollermetadata poller() {     periodictrigger trigger = new periodictrigger(10);     trigger.setfixedrate(true);     pollermetadata pollermetadata = new pollermetadata();     pollermetadata.settrigger(trigger);     return pollermetadata; }  @inboundchanneladapter(value = "channel1", poller = @poller("downloadtrigger")) public responseentity<appsitem[]> download() {     string url = "https://example.com/?page{pagenumber}";     try     {         sslutil.turnoffsslchecking();     }     catch (exception e)     {      }      httpheaders requestheaders = new httpheaders();     requestheaders.setaccept(collections.singletonlist(new mediatype("application","json")));     httpentity<?> requestentity = new httpentity<object>(requestheaders);     template.getmessageconverters().add(new mappingjackson2httpmessageconverter());       responseentity<appsitem[]> responseentity = template.exchange(url, httpmethod.get, requestentity, appsitem[].class, 10, 1);       return responseentity; }  @splitter(inputchannel = "channel1", outputchannel = "channel2") public list<appsitem> scrape(responseentity<appsitem[]> payload) {      //do something; }

as can see, have url accept variable pagenum name, want increase page number while response body empty, don't know how can implement spring integration.but let me explain need: 

1 - poller calling inbound method once peer hour 2 - inbound method start calling webservice page 1 page n. 3 - inbound method should pass data next channel before fetching next page

i need below:

    @inboundchanneladapter(value = "channel1", poller = @poller("downloadtrigger")) public responseentity<appsitem[]> download() {     string url = "https://example.com/?page{pagenumber}";     try     {         sslutil.turnoffsslchecking();     }     catch (exception e)     {      }      httpheaders requestheaders = new httpheaders();     requestheaders.setaccept(collections.singletonlist(new mediatype("application","json")));     httpentity<?> requestentity = new httpentity<object>(requestheaders);     template.getmessageconverters().add(new mappingjackson2httpmessageconverter());       responseentity<appsitem[]> responseentity;         int = 0;                 {             i++;             responseentity = template.exchange(url, httpmethod.get, requestentity, appsitem[].class, 10, i);             scraper.parse(responseentity);             log.info("entry={}", "");             //send response next channel in loop          }         while (responseentity.hasbody());       return responseentity; }

remove setmaxmessagesperpoll(1) downloadtrigger , poller (on each poll) keep calling download() until returns null.

increment page count on each call , reset when no more pages exist; poller next run after interval.


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