Hello Camel users,
I have a question regarding the camel-rabbitmq component. The following
code sends the message “test” to exchange “A” with routing key “B” every
5 seconds:
from("timer:test?period=5000").process(new Processor() {
@Override
public void process(Exchange exchange) throws Exception {
exchange.getOut().setBody("test", String.class);
exchange.getOut().getHeaders().put("rabbitmq.EXCHANGE_NAME", "A”); **
exchange.getOut().getHeaders().put("rabbitmq.ROUTING_KEY", "B”); **
}
})
.to("rabbitmq://localhost/A?username=guest&password=guest&routingKey=B&threadPoolSize=1&autoAck=false");
However when I comment out the lines with **, the message does not get
sent. Is this an expected behaviour? I found this stack overflow post,
essentially discussing the same issue:
http://stackoverflow.com/questions/22449086/apache-camel-rabbitmq-endpoint-not-creating
.
There is a paragraph at http://camel.apache.org/rabbitmq.html that says
"Headers are set by the consumer once the message is received. The
producer will also set the headers for downstream processors once the
exchange has taken place. Any headers set prior to production that the
producer sets will be overridden.”
The last sentence seems to suggest that the behaviour I described here
is expected. My question then is would it not make more sense if we did
not have to specifically set the headers in the out message?
Kind regards,
Ismail
