I have a camel route which processes hl7 messages. After the processing succeeds I would like to pass it to another endpoint b to do further processing.
But if any exception happens in processHL7, I have a catch block which does some processing. I want to stop processing when I go into the doCatch and encounter end, but this is not happening. Whatever happens the flow is going to endpoint b. How do i stop when I go into the doCatch block?
from("direct:a")
.doTry()
.to("bean:processHL7?method=process")
.doCatch(HL7Exception.class)
.to("direct:ErrorACK")
.transform(ack())
.end()
.transform(ack())
.to("direct:b");
This should work.
from("direct:a")
.doTry()
.to("bean:processHL7?method=process")
.doCatch(HL7Exception.class)
.to("direct:ErrorACK")
.transform(ack())
.stop()
.end()
.transform(ack())
.to("direct:b");
You can use stop() to stop the route from further processing.
Related
I'm trying to add error handling to my parallel processing:
...
.multicast(new GroupedMessageAggregationStrategy())
.parallelProcessing()
.to("direct:getAndSaveRoute1")
.to("direct:getAndSaveRoute2")
.end()
.split(body())
.choice()
.when(simple("${body.errorOcurred} == true"))
//TODO:: end route returning current body
.endChoice()
.otherwise()
.log(...)
.endChoice()
.end()
//after split, if no error occurred
.to("direct:nextRoute")
.end()
I can't seem to figure out though how to return/ end the route (and pass back the current body as the rest response body) within the choice in the split. end() and endRest() seem to cause issues...
It is also not clear as how many end()s I need; Adding an end() for the split causes an exception and makes Spring fail to boot.
For those in the future, I ended up making a bean to turn the list into a single message, and then do a choice based on that.
Not very 'camel', but needed to be wrapped up
I am trying to stop camel route when there is no more data in the database to pool, but unable to stop.
from("timer://pollTheDatabase?delay=50s")
.routeId("db-pooling-route")
.to("mybatis:queryToSelectData?statementType=SelectOne")
.choice()
.when().simple("${in.header.CamelMyBatisResult} == ''").stop()
.otherwise().to("direct:processing-data")
.end()
.end()
.end();
stop() means stop routing the current message, not the route itself. To stop/start routes etc you can use the controlbus component.
https://camel.apache.org/components/latest/controlbus-component.html
And since you want to stop the route from itself, then set the option async=true on the controlbus endpoint.
I tried using control-bus and it worked.
from("timer://pollTheDatabase?delay=50s&synchronous=false")
.routeId("db-pooling-route")
.to("mybatis:queryToSelectData?statementType=SelectOne")
.choice()
.when().simple("${in.header.CamelMyBatisResult} == ''")
.to("controlbus:route?async=true&routeId=db-pooling-route&action=stop")
.end()
.to("direct:processing-data");
I have implemented a retry functionality in my code using camel retry. It will retry a maximum of five times.
onException(Exception.class)
.maximumRedeliveries(5)
.retryAttemptedLogLevel(LoggingLevel.WARN)
.backOffMultiplier(5)
.maximumRedeliveryDelay(5)
.useExponentialBackOff();
Now I want to call a custom method if the threshold has been reached instead of throwing an exception. How can I achieve this?
This is exact use-case for Dead Letter Channel EIP pattern. I would suggest converting your onException block to errorHandler and use deadLetterChannel builder.
errorHandler(
deadLetterChannel("direct:redeliveryExhausted")
.maximumRedeliveries(5)
.retryAttemptedLogLevel(LoggingLevel.WARN)
.backOffMultiplier(5)
.maximumRedeliveryDelay(5)
.useExponentialBackOff()
);
from("direct:redeliveryExhausted")
.log("I am going to handle non-deliverable message")
.log("Because of this exception: ${exception}")
.to("log:failed");
You can set the handled-flagto true and then call your custom bean.
onException(Exception.class)
.maximumRedeliveries(5)
.retryAttemptedLogLevel(LoggingLevel.WARN)
.backOffMultiplier(5)
.maximumRedeliveryDelay(5)
.useExponentialBackOff()
.handled(true)
.to("bean:myCustomBean");
My code consumes jms queue and through lb redirects to external http client.
I need to log original message for every failed delivery to local directory.
Problem is that onException is caught by each failover.
Is there any way how to achieve this?
Pseudo code:
onException(Exception.class).useOriginalMessage()
.setHeader(...)
.to("file...")
.setHeader(...)
.to("file...")
from("activemq...")
.process(...)
.loadBalance().failover(...)
.to("lb-route1")
.to("lb-route2")
.end()
.process()
.to("file...")
from("lb-route1")
.recipientList("dynamic url")
.end()
from("lb-route2")
.recipientList("dynamic url")
.end()
I have not tested this logic with multiple to statements, but when I have my list of endpoints in an array this logic functions just fine. I will attempt to deliver to the first endpoint, if I cannot I will attempt to deliver this to the second endpoint. If an exception occurs at the second endpoint it will propagate back to the route's error handler. If you need it to round robin instead, change the last false on the failover statement to a true.
String[] endpointList = {"direct:end1", "direct:end2"};
from("direct:start")
.loadbalance().failover(endpointList.length-1, false, false)
.to(endpointList);
I'm trying to build a route that tries to validate an xml and if everything is correct then has to split this file otherwise an exception is thrown and it has to do something else. So I did the following:
from("file:"+fileOutboxTransformed+"?preMove=inprogress&move="+backupFolderTransformed+"/"+labelMessageType+"_${date:now:yyyyMMddHHmmssSSS}-${file:name.noext}.${file:ext}")
.log(LoggingLevel.INFO, "Got transformed file and sending it to jms queue: "+queue)
.doTry()
.to("validator:classpath:"+validator)
.split(xPathMessageTypeSplit)
.to("jms:"+queue+"?jmsMessageType=Text")
.doCatch(ValidationException.class)
.log(LoggingLevel.INFO, "Validation Exception for message ${body}")
.to("xslt:classpath:"+transformationsErrorAfter)
.split(xPathNotificationSplit)
.to("file:"+fileOutboxInvalid+"?fileName=${file:name.noext}-${date:now:yyyyMMddHHmmssSSS}.err2")
.end();
But it does not compile (if I do not use the split then it compiles and works) and the error is:
The method doCatch(Class<ValidationException>) is undefined for the type ExpressionNode
So I tried the following
from("file:"+fileOutboxTransformed+"?preMove=inprogress&move="+backupFolderTransformed+"/"+labelMessageType+"_${date:now:yyyyMMddHHmmssSSS}-${file:name.noext}.${file:ext}")
.log(LoggingLevel.INFO, "Got transformed file and sending it to jms queue: "+queue)
.doTry()
.to("direct:validate")
.doCatch(ValidationException.class)
.log(LoggingLevel.INFO, "Validation Exception for message ${body}")
.to("xslt:classpath:"+transformationsErrorAfter)
.split(xPathNotificationSplit)
.to("file:"+fileOutboxInvalid+"?fileName=${file:name.noext}-${date:now:yyyyMMddHHmmssSSS}.err2")
.end();
from("direct:validate")
.to("validator:classpath:"+validator)
.to("direct:split_message");
from("direct:split_message")
.split(xPathMessageTypeSplit)
.to("jms:"+queue+"?jmsMessageType=Text");
This time I get the error of duplicate endpoint
org.apache.camel.FailedToStartRouteException: Failed to start route route312 because of Multiple consumers for the same endpoint is not allowed: Endpoint[direct://validate]
do you have any idea on how to solve this problem?
In order to get back to the doTry() block from a split() block (or choice or other nested type), you need to use the endDoTry(). Contrary to its name, this method will end the nested split block and return back to the doTry() DSL.
I'd use the first route you posted with these changes:
from("file:"+fileOutboxTransformed+"?preMove=inprogress&move="+backupFolderTransformed+"/"+labelMessageType+"_${date:now:yyyyMMddHHmmssSSS}-${file:name.noext}.${file:ext}")
.log(LoggingLevel.INFO, "Got transformed file and sending it to jms queue: "+queue)
.doTry()
.to("validator:classpath:"+validator)
.split(xPathMessageTypeSplit)
.to("jms:"+queue+"?jmsMessageType=Text")
.endDoTry()
.doCatch(ValidationException.class)
.log(LoggingLevel.INFO, "Validation Exception for message ${body}")
.to("xslt:classpath:"+transformationsErrorAfter)
.split(xPathNotificationSplit)
.to("file:"+fileOutboxInvalid+"?fileName=${file:name.noext}-${date:now:yyyyMMddHHmmssSSS}.err2")
.endDoTry()
.end();
Your second try seems fine. The error you're getting is caused by two routes beginning with from("direct:validate")
Don't you have an other route in your application consuming from the same endpoint?
Edit : Try to name it differently, maybe validate exists already (in your app or inside camel)