正确的方式分裂，丰富项目，然后发送每个项目到另一个频道？

Question

这是正确的方式拆分一个项目列表，丰富每个项目，然后将这些丰富的项目发送到另一个频道吗？

this.sitePackage = new Package();
this.sitePackage.add(page1);
this.sitePackage.add(page2);
this.sitePackage.add(page3);

//Publish using gateway
this.publishingService.publish(sitePackage);

this.sitePackage.add(page1);
this.sitePackage.add(page1);

this.sitePackage.add(page2);
this.sitePackage.add(page2);

this.sitePackage.add(page3);
this.sitePackage.add(page3);

@Bean
IntegrationFlow flowPublishPackage()
{
    return flow -> flow
        .channel(this.publishPackageChannel())
        .<Package>handle((p, h) -> this.savePackage(p))
        .split(Package.class, this::splitPackage)
        .channel(this.publishPackageItemChannel());
}

@Bean
@PublishPackageChannel
MessageChannel publishPackageChannel()
{
    return MessageChannels.direct().get();
}

@Bean
@PublishPackageItemChannel
MessageChannel publishPackageItemChannel()
{
    return MessageChannels.direct().get();
}

@Splitter
List<PackageEntry> splitPackage(final Package bundle)
{
    final List<PackageEntry> enrichedEntries = new ArrayList<>();
    for (final PackageEntry entry : bundle.getItems())
    {
       enrichedEntries.add(entry);
    }

    return enrichedEntries;
}

@Bean
GatewayProxyFactoryBean publishingGateway()
{
    final GatewayProxyFactoryBean proxy = new GatewayProxyFactoryBean(PublishingService.class);
    proxy.setBeanFactory(this.beanFactory);
    proxy.setDefaultRequestChannel(this.publishPackageChannel());
    proxy.setDefaultReplyChannel(this.publishPackageChannel());
    proxy.afterPropertiesSet();
    return proxy;
}

接下来，CMS发布流被附加到publishPackageItem通道，并根据拆分后的类型，路由到特定的元素通道进行处理。拆分页面后，只有特定的元素类型才可能有订阅流。

@Inject
public CmsPublishFlow(@PublishPackageItemChannel final MessageChannel channelPublishPackageItem)
{
    this.channelPublishPackageItem = channelPublishPackageItem;
}

@Bean
@PublishPageChannel
MessageChannel channelPublishPage()
{
    return MessageChannels.direct().get();
}

@Bean
IntegrationFlow flowPublishContent()
{
    return flow -> flow
        .channel(this.channelPublishPackageItem)
        .filter(PackageEntry.class, p -> p.getEntry() instanceof Page)
        .transform(PackageEntry.class, PackageEntry::getEntry)
        .split(Page.class, this::traversePageElements)
        .<Content, String>route(Content::getType, mapping -> mapping
            .resolutionRequired(false)
            .subFlowMapping(PAGE, sf -> sf.channel(channelPublishPage()))
            .subFlowMapping(IMAGE, sf -> sf.channel(channelPublishAsset()))
            .defaultOutputToParentFlow());
    //.channel(IntegrationContextUtils.NULL_CHANNEL_BEAN_NAME);
}

最后，我的目标是订阅通道并相应地处理每个元素。我将此流订阅到ChannelPublishPage。每个订户可以不同地处理元素。

@Inject
@PublishPageChannel
private MessageChannel channelPublishPage;

@Bean
IntegrationFlow flowPublishPage()
{
    return flow -> flow
        .channel(this.channelPublishPage)
        .publishSubscribeChannel(c -> c
            .subscribe(s -> s
                .<Page>handle((p, h) -> this
                    .generatePage(p))));
}

Answer 1

我不知何故觉得问题就在这里：

proxy.setDefaultRequestChannel(this.publishPackageChannel());
 proxy.setDefaultReplyChannel(this.publishPackageChannel());

请考虑不要对请求和等待答复使用相同的通道。这样你会带来一些循环和意想不到的行为。