Back to Basics : Apache Camel Routes and Direct Component

[anand_tech]

I am bit confused about Camel routes and its two endpoints : Direct and Seda.
Well let's say i have a route like this :

    public void configure()
    {
     from("direct:services")
      .process(//Some processing here)
      .to("http://ThirdPartyServers";)
    }

On top of this I have a rest web service which receives several requests,
does some processing and then hands over the message to this route to get
response from some third party servers. I have instantiated Camel Context
through Spring framework like this : 


    <camelContext id="appCamelContext"
xmlns="http://camel.apache.org/schema/spring";
                trace="true" streamCache="true">
                <propertyPlaceholder id="properties"
                        location="classpath:camel.properties" />
                <camel:routeBuilder ref="oneRouteBuilder" />
                <camel:routeBuilder ref="photosRouteBuilder" />
    </camelContext>

Now the question is that in a instant I send multiple different messages to
this route. Now Camel documentation says that direct component is invoked in
single thread and is synchronous. So will all the messages be processed
concurrently or one by one processing will happen ?

Also if i change the direct component to seda, will it make any difference ?

Also regarding the same Direct and Seda components. Lets say my route is now
like this : 

    public void configure(){
    from("direct:services")
     .choice()
     .when("some predicate here-Predicate1")
     .to("seda:predicate1")
     .otherwise()
     .to("seda:fallback")
     .end();
    
     from("seda:predicate1")
     .process("some processing")
     .to("http://ThirdPartyServers";);
    
     from("seda:fallback")
     .process("some processing")
     .to("jms:fallbackqueue");
    }

Now if i send 5 messages to direct component from different threads, so
these messages would be processed concurrently. As you can see in the above
route, direct component sends the message to seda component. So now will
there be only one thread of seda component which will process all the
different 5 messages? Meaning in the end all the messages will be processed
one by one ?

TIA



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