Question

我正在使用Spring Could Data Flow 1.7.2.RELEASE，并试图遵循this blog post

创建“将处理器+接收器组合到单个应用程序中：“新接收器”。”

当我将代码结构化为博客的示例时，我遇到了问题，我发现这是因为博客的示例使用了类似于Processor的java.util.Function。

我猜我应该使用java.util.Consumer，因为我正在尝试将现有的接收器更改为处理器-接收器混合

我的课看起来像这样：

@EnableBinding(Sink.class)
public class SampleCombinedSink extends Something {

    String modifiedPayload;
    Logger log;

    Consumer<String> consumer = i -> { modifiedPayload="STUFF ADDED BY CONSUMER i=["+i+"]"; };

    public void accept(String s){
      log.info("SampleCombinedSink.accept() s="+s);
    }

    @StreamListener(Sink.INPUT)
    public void doSink(String payload) {

      consumer.accept(payload);
      log.info("SampleCombinedSink.doSink() Payload received.");
      log.info("SampleCombinedSink.doSink() payload="+ payload);
      log.info("SampleCombinedSink.doSink() modifiedPayload="+ modifiedPayload);
    }
}

我的输出如下：

SampleCombinedSink.doSink() Payload received.
SampleCombinedSink.doSink() payload=Friday 11 January 2019 19:03:53.330+0000
SampleCombinedSink.doSink() modifiedPayload=STUFF ADDED BY CONSUMER i=[Friday 11 January 2019 19:03:53.330+0000]
SampleCombinedSink.doSink() Payload received.
SampleCombinedSink.doSink() payload=Friday 11 January 2019 19:03:54.332+0000
SampleCombinedSink.doSink() modifiedPayload=STUFF ADDED BY CONSUMER i=[Friday 11 January 2019 19:03:54.332+0000]
SampleCombinedSink.doSink() Payload received.
SampleCombinedSink.doSink() payload=Friday 11 January 2019 19:03:55.333+0000
SampleCombinedSink.doSink() modifiedPayload=STUFF ADDED BY CONSUMER i=[Friday 11 January 2019 19:03:55.333+0000]
SampleCombinedSink.doSink() Payload received.
SampleCombinedSink.doSink() payload=Friday 11 January 2019 19:03:56.313+0000
SampleCombinedSink.doSink() modifiedPayload=STUFF ADDED BY CONSUMER i=[Friday 11 January 2019 19:03:56.313+0000]

“我的来源”每秒发出一个时间戳。

我对我的消费者感到困惑。

Consumer<String> consumer = i -> { modifiedPayload="STUFF ADDED BY CONSUMER i=["+i+"]"; };

我认为我可以做类似的事情：

Consumer<String> consumer = i -> { i="STUFF ADDED BY CONSUMER i=["+i+"]"; };

，然后放入

@StreamListener(Sink.INPUT)
public void doSink(String payload) {

将包含“由消费者添加的东西i = [时间戳]”

没有。

我想将输入更改为doSink并通过添加“ STUFF ADDED BY CONSUMER”进行更改，以便当输入到达doSink（String有效负载）时，有效载荷将包含“ STUFF ADDED BY CONSUMER i = [时间戳]“

我该如何实现？

Answer 1

在这种情况下，您不必在Sink应用程序中进行任何更改，只需在Sink应用程序端使用相同的功能管道即可。

例如，要制作：

a combination of processor + sink into a single application: “a new sink”."

您需要做的是将function bean作为Sink应用程序的一部分，甚至将function bean放在单独的工件中，但放在{classpath}中{1}}应用程序。完成此操作后，就可以为Sink应用程序定义spring.cloud.stream.function.definition。

您可以看到此here的示例。应用Sink has定义了功能bean。

运行示例：

log-composed

在dataflow:>app register --name http-transformer --type source --uri file:///Users/igopinathan/dev/git/ilayaperumalg/sandbox/function-composition/http-transformer/target/http-transformer-2.1.0.BUILD-SNAPSHOT.jar Successfully registered application 'source:http-transformer' dataflow:>app register --name log-composed --type sink --uri file:///Users/igopinathan/.m2/repository/org/springframework/cloud/stream/app/log-composed/2.1.0.BUILD-SNAPSHOT/log-composed-2.1.0.BUILD-SNAPSHOT.jar Successfully registered application 'sink:log-composed' dataflow:>stream create helloComposed --definition "http-transformer --server.port=9001 | log-composed" Created new stream 'helloComposed' dataflow:>stream deploy helloComposed --properties "app.log-composed.spring.cloud.stream.function.definition=upper|concat,deployer.*.local.inheritLogging=true" Deployment request has been sent for stream 'helloComposed' dataflow:>http post --data "friend" --target "http://localhost:9001"命令中，您可以看到用于指定stream deploy的应用是function composition。

有关组合处理器和接收器的问题

1 个答案: