时间戳

首页 > 解决方案 > 如何在平行通量内的同一线程中运行单声道

java - 如何在平行通量内的同一线程中运行单声道

问题描述

我正在尝试用来自 Mono 的值填充 Flux 中的对象。当我试图这样做时，它只是忽略了我的“设置”操作。我认为这是因为 Flux 是并行工作的，而 Mono 不是。我怎么解决这个问题？

Flux.fromIterable(proxyParserService.getProxyList())
            .parallel()
            .runOn(Schedulers.parallel())
            .filter(proxy -> proxy.getCorrupted() == null || !proxy.getCorrupted())
            .subscribe(proxy -> {
                        try {
                            RestTemplate restTemplate = getProxiedTemplate(proxy.getHost(), proxy.getPort());
                            restTemplate.exchange(URI, HttpMethod.GET, HttpEntity.EMPTY, String.class);
                            geoDataService.getData(proxy.getHost()) // Here comes the Mono object, that contains needed value to set into "proxy"
                                    .subscribe(geoData ->
                                    {
                                        log.info("GEODATA: {} ", geoData);
                                        proxy.setCountryCode(geoData.getCountryCode()); // ignored somehow
                                    });
                            proxy.setCorrupted(false);
                            addresses.add(proxy);
                            log.info("IP {}:{} is OK", proxy.getHost(), proxy.getPort());
                            log.info("Final result: {}", proxy.toString());
                        } catch (ResourceAccessException e) {
                            log.info("IP {}:{} is corrupted!", proxy.getHost(), proxy.getPort());
                            proxy.setCorrupted(true);
                            addresses.add(proxy);
                        }
                    },
                    throwable -> log.error(String.format("Exception caught while trying to fill map: %s", throwable.getCause())));

}

这是一些日志

如您所见，我正在尝试将国家/地区代码设置为代理。

标签： javareactive-programmingspring-webflux

解决方案

解决了。在“flatMap”运算符中添加了 Mono 对象。例子：

Flux.fromIterable(proxyParserService.getProxyList())
            .parallel()
            .runOn(Schedulers.parallel())
            .filter(poxy -> !valueExist(addresses.values(), poxy))
            .flatMap(geoDataService::getData) // Now it runs in parallel threads
            .subscribe(proxy -> {
                        try {
                            RestTemplate restTemplate = getProxiedTemplate(proxy.getHost(), proxy.getPort());
                            restTemplate.exchange(URI, HttpMethod.GET, HttpEntity.EMPTY, String.class);
                            proxy.setCorrupted(false);
                            addresses.put(proxy.getCountryCode(), proxy);
                            log.info("IP {}:{} is OK", proxy.getHost(), proxy.getPort());
                            log.info("Final result: {}", proxy.toString());
                        } catch (ResourceAccessException e) {
                            log.info("IP {}:{} is corrupted!", proxy.getHost(), proxy.getPort());
                            proxy.setCorrupted(true);
                            addresses.put(proxy.getCountryCode(), proxy);
                        }
                    },
                    throwable -> log.error(String.format("Exception caught while trying to fill map: %s", throwable.getCause())));

推荐阅读