kamelets: create a camel-kamelet component

[lburgazzoli]

As described in apache/camel-k#1567, a kamelet should be consumed like a regular component, like

from("timer:trigger")
    .to("kamelet:myKamelet?foo=bar")
    .log("${body}")

Mechanic

The createEndpoint of the kamelet component should looks like:

Endpoint createEndpoint(String uri, String remaining, Map<String, Object> parameters) {
    var kameletName = StringHelper.before(reamining, "/");
    var kameletId = StringHelper.after(reamining, "/");
    if (kameletId == null) {
        kameletId = generateKameletId();
    }

    // load properties
    var options = new HashMap<String, Object>()
    options.putAll(getProperties("camel.kamelet." + kameletName))
    options.putAll(getProperties("camel.kamelet." + kameletName + "." + kameletId))
    options.putAll(parameters)

    // materialize a route builder by loading the kamelet as a standard source, so through
    // one of the available org.apache.camel.k.SourceLoader      
    var route = loadRoute(kameletName)
 
    // replace the input with a direct
    route.setInput("direct:" + kameletName + "-" + kameletId)

    // set route specific options
    // requires https://issues.apache.org/jira/browse/CAMEL-14963
    route.setPropertiers(options)

    // create an endpoint that connects the route create above
    return context.getEndpoint("direct:" + kameletName + "-" + kameletId)
}

[lburgazzoli]

Related issues:

• https://issues.apache.org/jira/browse/CAMEL-15312
• https://issues.apache.org/jira/browse/CAMEL-15313

[lburgazzoli]

Initial work tracked here: https://github.com/lburgazzoli/apache-camel-k-runtime/tree/github-375-kamelets

[davsclaus]

@lburgazzoli I took your work and created a branch on ASF so we all can push to it. Somehow I got a branch kamelets already exists so I named it -claus

https://github.com/apache/camel-k-runtime/tree/kamelets-claus