[GitHub] [camel-k] lancerdima commented on issue #1984: Options to share state between routes

[GitBox]

lancerdima commented on issue #1984:
URL: https://github.com/apache/camel-k/issues/1984#issuecomment-772399778


   Maybe I am missing the whole point of camel-caffeine, but it fails to cache 
value between multiple executions of the same flow.
   Consider the snippet below. The point of the snippet, is to display "cached" 
value from previous execution first, and then update the cache with the new one.
   ```
   import org.apache.camel.builder.RouteBuilder;
   
   public class Caffeine extends RouteBuilder {
       @Override
       public void configure() throws Exception {
           from("timer:offsetHandler?fixedRate=true&period=10000&delay=5000")
               .to("caffeine-cache://cache?key=offset&action=GET")
               .log("Old value: ${body}")
   
               .setBody(simple("${headers.CamelTimerCounter}"))
               .to("caffeine-cache://cache?action=PUT&key=offset")
               .log("New value: ${body}");
       }
   }
   ```
   
   Output log indicate that value from previous execution is lost:
   ```
   [1] 2021-02-03 10:13:15,031 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) Old value: 
   [1] 2021-02-03 10:13:15,033 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) New value: 1
   [1] 2021-02-03 10:13:25,018 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) Old value: 
   [1] 2021-02-03 10:13:25,021 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) New value: 2
   [1] 2021-02-03 10:13:35,017 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) Old value: 
   [1] 2021-02-03 10:13:35,018 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) New value: 3
   [1] 2021-02-03 10:13:45,017 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) Old value: 
   [1] 2021-02-03 10:13:45,018 INFO  [route1] (Camel (camel-1) thread #0 - 
timer://offsetHandler) New value: 4
   ```
   
   Not sure whether it is camel-caffeine problem, or a discrepancy in how Camel 
K vs classic Camel behaves.


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