[GitHub] [camel-k] arthurdm commented on issue #2116: Add sample using Flink

[GitBox]

arthurdm commented on issue #2116:
URL: https://github.com/apache/camel-k/issues/2116#issuecomment-797047908


   Thanks @oscerd!   I think a very useful sample would show how to create a 
`DataSet` that took into consideration the incoming payload.  Here's the 
snippet I was trying to get to work [1].  I couldn't get my `DataSet` to be 
registered.  Keep getting this error [2].
   
   **[1]**
   ```java
   public class FlinkSample extends RouteBuilder implements Processor {
   
       @Override
       public void configure() throws Exception {
   
           // Receive a msg from the configured Kafka topic
           from("timer:foo")
               .log("Received body: ${body}")
               .split(body().tokenize("\n"))
               .process(this)
           
.to("flink:dataSet?dataSet=#myDataSet&dataSetCallback=#myDataSetCallback")
               .log("Response body: ${body}");
   
       }
   
       @BindToRegistry
       public  DataSetCallback<String> myDataSetCallback () {
           return new DataSetCallback<String>() {
               @Override
               public String onDataSet(DataSet ds, Object... payloads) {
                   return "this is the result";
               }
            };
       }
   
       @Override
       public void process(Exchange exchange) throws Exception {
           final ExecutionEnvironment env = 
ExecutionEnvironment.getExecutionEnvironment();
           DataSet<String> myDataSet = 
env.fromElements(exchange.getIn().toString());
           exchange.getContext().getRegistry().bind("myDataSet", DataSet.class, 
myDataSet);
       }
   
   }
   ```
   
   **[2]**
   ```
   Failed to start application (with profile prod): 
org.apache.camel.NoSuchBeanException: No bean could be found in the registry 
for: myDataSet of type: org.apache.flink.api.java.DataSet
        at 
org.apache.camel.support.CamelContextHelper.mandatoryLookupAndConvert(CamelContextHelper.java:253)
        at 
org.apache.camel.support.EndpointHelper.resolveReferenceParameter(EndpointHelper.java:290)
        at 
org.apache.camel.support.EndpointHelper.resolveReferenceParameter(EndpointHelper.java:250)
        at 
org.apache.camel.support.component.PropertyConfigurerSupport.property(PropertyConfigurerSupport.java:53)
        at 
org.apache.camel.component.flink.FlinkEndpointConfigurer.configure(FlinkEndpointConfigurer.java:26)
        at 
org.apache.camel.support.PropertyBindingSupport.setSimplePropertyViaConfigurer(PropertyBindingSupport.java:703)
   ```


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