I have a Camel route which Consumes messages from a Queue and stores the message into a Database. Now I wanted to shut down running camel route manually in a graceful manner. I have a RestEndpoint to be triggered whenever I need to stop Camel route. This endpoint should stop the route. But if there is any in-flight message or transaction running during the shutdown it has to be completed successfully without consuming any new messages from from("") endpoint of camel route and shut down after completing inflight message or transaction. Can anyone help me how Can I code this?
Below are the few options to control/monitor camel routes
CamelContext API's
Control bus component
JMX API's
You can go through below two sites to get started
http://camel.apache.org/controlbus.html
https://dzone.com/articles/apache-camel-monitoring
shutdownRunningTask(ShutdownRunningTask.CompleteCurrentTaskOnly)
Related
I have one of the camel route as follows, there are many routes.
from("jms:queue:TEST.LQ?transacted=true&connectionFactory=jmsConnectionFactory&cacheLevelName=CACHE_NONE")
.routeId("routeid")
.autoStartup("true")
.transacted("requried")
....
....
I getting below error if TEST.LQ MQ or Queue manager is unavailable.
ERROR [JmsConsumer[TEST.LQ]] [] [o.a.c.c.j.DefaultJmsMessageListenerContainer ] Could not refresh JMS Connection for destination
I tried to handle exception by catching below code, but JmsMessageListenerContainer only throws the message not an exceptiom
onException(MQException.class, JMSException.class)
How stop route if IF MQ is not available?
The camel jms component has the option for this -
Add the testConnectionOnStartup=true option in your from(uri) :
from("jms:queue:TEST.LQ?transacted=true&connectionFactory=jmsConnectionFactory&cacheLevelName=CACHE_NONE&testConnectionOnStartup=true")
This will throw an exception if a connection is not available during startup which can then be handled.
More details are available in the jms-component page
#sree1611,
You can add exceptionListener or errorHandler query parameter in camel jms uri.
To create your own exception listener, implement org.apache.camel.spi.ExceptionHandler
To create your own error handler, implement org.springframework.util.ErrorHandler
I hope errors while consuming from MQ can't be bridged with camel error handlers, so you can't catch JMS exceptions (occurred during message consumption from MQ) in onException().
I'm using apache camel xml based paho routes for the subscription, publication process. While online, everything works fine. But I'm not able to receive the offline message.
I have set the following.,
Constant Client ID
Clean Session is FALSE,
Both subscribed & published with QoS 2
With the standalone Program, it's getting all the offline messages. With the camel route it's not happening.
Finally, I was able to solve this one manually.
Camel PAHO Client is not populating the callback function before performing the broker connection. They are doing it only when the connection is made.
So, once the connection is success then the broker just sends all the offline messages. In this case, our client does not have callback handlers to handle these messages. So they are lost.
Other clients (IoThub Client) which uses the PAHO internally is doing it right by setting the callback and initiating the connection.
I am using apache camel and wants to have multiple routes.The route is as below.
endpoint -> quartz2://tsTimer?cron=0%2F20+*+8-18+%3F+*+MON%2CTUE%2CWED%2CTHU%2CFRI+*&stateful=true&trigger.timeZone=Asia%2FSingapore
Call bean method to get data.
Send to MQ
In this case my route is going to be same as the polling interval is same.
The data from bean method will be different.
And the MQ queue will be same.
Failed to start route route2 because of Multiple consumers for the same endpoint is not allowed: quartz2://tsTimer?cron=0%2F20+*+8-18+%3F+*+MON%2CTUE%2CWED%2CTHU%2CFRI+*&stateful=true&trigger.timeZone=Asia%2FSingapore
How do i achieve this? How do i differentiate camel route in case when the endpoint is quartz2 timer?
I din't notice that in endpoint uri I was having tsTimer which will distinguishes other end-points.
Something like below
quartz2://tsTimer1
quartz2://tsTimer2
quartz2://tsTimer3
I am using camel jms in a synchronous way using request-reply pattern.The camel route exposes a cxf endpoint and it places the message in to the jms queue another component process it and sends the response in replyto queue.
A new thread is getting created while receiving the reply from replyto queue?Iam facing issues with using log4j MDC with in the camel route.The values store in MDC are no more available?
Is it the behaviour of camel jms request/reply pattern?
Below is the JMS endpoint:
<to id="QueueEndpoint" pattern="InOut" uri="hornetq:queue:{{esb.api.requestqueue}}?replyTo=queue:{{esb.api.responsequeue}}&useMessageIDAsCorrelationID=true&replyToType=Exclusive&requestTimeout={{esb.api.queue.requesttimeout}}"/>
camel-fuse 2.8
I have a camel jaxrs server which accepts requests then kicks-off 2 Camel routes.
The first route, consumes requests from cxfrs endpoint/bean and ships them to jms queue inbox.
The second route, consumes requests from jms queue inbox for business logic processing, then ships the results to jms queue outbox.
My question is related to http response and sending the results to jaxrs server consumer.
Is it possible to send an http response back to http client from first route with results from second route? (synchronously)
from("cxfrs:bean:personLookupEndpoint") <-- http client waits for response...
.setExchangePattern(ExchangePattern.InOut)
.process(new RequestProcessor())
.to(inbox);
from(inbox)
.unmarshal(jaxb)
.process(new QueryServiceProcessor())
.to("bean:lookupService?method=processQuery(${body})")
.convertBodyTo(String.class)
.to(outbox); <-- need to send results to font-end consumer synchronously ...
Do you really need to do it using queues? I think that it would be better to use direct: routes instead.
There is a possibility to use the InOut exchange pattern for a JMS endpoint, but it has some limitations: http://fusesource.com/docs/router/2.2/transactions/JMS-Synchronous.html