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java利用Future实现多线程执行与结果聚合实例代码

程序员文章站 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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