Hi all,
In the last presentation there was also a short demo on CamelK. That looked
very interesting, but I have some questions on how does it work, especially
in more complex use cases.
Here are some questions I have:
Question 1: Dependency resolution
In CamelK you can provide the following:
from("imap://[email protected]")
.to("seda:output")
Because imap is not part of core this will start the dependency resolution.
How does this work? How does CamelK know it needs the mail component as
dependency? Is there some kind of fixed mapping between the scheme and
component?
Say for example I have the following route:
from("seda:input")
.to("seda:output")
This is then run on Kubernetes/CamelK. Then I change this to:
from("imap://[email protected]")
.to("seda:output")
Is this dependency add as "Maven" dependency and then recompiled? Or is the
jar downloaded and the added? Or something else...
Question 2: Multiple files
In the Java example:
https://camel.apache.org/camel-k/latest/languages/java.html
There is one simple route with one file. How does it work in more complex
cases when there are multiple files?
For example I have the following package:
Registry.java
Route1.java
Route2.java
Processor.java
Connection.java
In Route1.java data is retrieved with the SQL component out of an Oracle
database, also this routs calls a processor. In route 2 the pojo is
marshalled to JSON and send to a HTTP endpoint. In registry things like
SSL, metrics are configured. In the processor some mapping is done and in
the connection the Oracle driver is configured.
Can I run a whole package with the Kamel CLI? How does Kamel gets for
example the dependency for the Oracle driver?
Question 3: Configure and Management from Java.
What I believe is that the Kamel CLI client is written in Go. So the flow
is as follows:
A) Write some Camel code in the available languages.
https://camel.apache.org/camel-k/latest/languages/languages.html
B) Use Kamel CLI to run/deploy it on Kubernetes
C) Use something like hawt.io to manage it.
Is this also available from Java (or as Camel component) to
configure/deploy it from Java code and to manage it from Java code?
Question 4: Scaling
Kubernetes is ideal for horizontal scaling. How does this work with CamelK?
Say I have the following two routes:
from("activemq:topic:foo")
.to("sftp://sample.com/someDir";)
from("sftp://sample.com/someDir";)
.to("activemq:topic:foo")
When the routes are scaled. How does CamelK prevent that in the first route
multiple messages arrive in the same FTP directory. And in the second
example there are multiple routes listening to the same directory and get
file locks. Does it have possibilities how to scale the routes?
Kind regards,
Raymond
