java利用Future实现多线程执行与结果聚合实例代码
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2022-06-10 15:06:47
目录场景解决总结场景网站智能问答场景,需要对多个分类查询,结果聚合展示由于每种分类都有自己的业务逻辑,有的需要查询数据库中间库,有的需要查询elasticsearch搜索引擎,有的需要调用第三方接口,...
场景
网站智能问答场景,需要对多个分类查询,结果聚合展示
由于每种分类都有自己的业务逻辑,有的需要查询数据库中间库,有的需要查询elasticsearch搜索引擎,有的需要调用第三方接口,数据查询要分开进行,没法一次查询搞定
实际上这几个查询不相关,可以同时进行,现在串行,使该场景下,智能问答返回较慢
解决
最简单的逻辑,肯定就是java多线程,将串行改为并行
这样查询返回时间,就取决于最慢的一个查询,返回时间大大缩短
页面返回一般要求三秒内,实际项目上我们要求1秒内返回,多线程解决了这个问题
下面上代码,部分截取
@autowired private threadpooltaskexecutor taskexecutor;
// 新闻查询 solrpagequeryvo newsqueryvo = new solrpagequeryvo(); beanutil.copyproperties(vo, newsqueryvo); newsqueryvo.setallsite(vo.getallsite()); newsqueryvo.settypecode(solrpagequeryvo.typecode.articlenews.tostring().concat(",") .concat(solrpagequeryvo.typecode.picturenews.tostring()) .concat(",").concat(solrpagequeryvo.typecode.videonews.tostring())); future<?> newsfuture = taskexecutor.submit(()->selectforask(map, summap, newsqueryvo, "news", context)); //网上服务 future<?> workguidefuture = taskexecutor.submit(()->selectforask(map, summap, vo, "workguide", context)); //留言 solrpagequeryvo messageboardqueryvo = new solrpagequeryvo(); beanutil.copyproperties(vo, messageboardqueryvo); messageboardqueryvo.setallsite(vo.getallsite()); messageboardqueryvo.settypecode(solrpagequeryvo.typecode.messageboard.tostring()); future<?> messageboardfuture = taskexecutor.submit(()->selectforask(map, summap, messageboardqueryvo, "messageboard", context)); //信息公开(isallsite为true时,搜索所有集合,不区分集合和站点,只根据dn搜索,有区分需要的项目可以重写searchesserviceimpl类) solrpagequeryvo publiccontentqueryvo = new solrpagequeryvo(); beanutil.copyproperties(vo, publiccontentqueryvo); publiccontentqueryvo.setallsite(vo.getallsite()); publiccontentqueryvo.settypecode(solrpagequeryvo.typecode.public_content.tostring()); future<?> publiccontentfuture = taskexecutor.submit(()->selectforask(map, summap, publiccontentqueryvo, "public_content", context)); //问答知识库(isallsite为true时,搜索所有集合,不区分集合和站点,有区分需要的项目可以重写或传false) solrpagequeryvo knowledgebasequeryvo = new solrpagequeryvo(); beanutil.copyproperties(vo, knowledgebasequeryvo); knowledgebasequeryvo.setallsite(vo.getallsite()); knowledgebasequeryvo.settypecode(solrpagequeryvo.typecode.knowledgebase.tostring()); future<?> knowledgebasefuture = taskexecutor.submit(()->selectforask(map, summap, knowledgebasequeryvo, "knowledgebase", context)); try { knowledgebasefuture.get(); } catch (exception e) { e.printstacktrace(); } try { messageboardfuture.get(); } catch (exception e) { e.printstacktrace(); } try { newsfuture.get(); } catch (exception e) { e.printstacktrace(); } try { publiccontentfuture.get(); } catch (exception e) { e.printstacktrace(); } try { workguidefuture.get(); } catch (exception e) { e.printstacktrace(); } tabcount = summap.values().size(); map.put("tabcount", tabcount); map.put("nummap", summap);
private void selectforask(map<string, object> map, map<string, object> summap, solrpagequeryvo vo, string type, context context) { if ("news".equals(type)) { try { // do something } catch (exception e) { e.printstacktrace(); } } else if ("workguide".equals(type)) { try { //网上办事查询调用接口 // do something } catch (exception e) { e.printstacktrace(); } } else if ("messageboard".equals(type)) { try { // do something } catch (exception e) { e.printstacktrace(); } } else if ("public_content".equals(type)) { try { long querycount = searchqueryholder.querycount(vo); // do something } catch (exception e) { e.printstacktrace(); } } else if ("knowledgebase".equals(type)) { try { // do something } catch (exception e) { e.printstacktrace(); } } }
总结
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