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From Romain Manni-Bucau <rmannibu...@gmail.com>
Subject Re: bean, ejb etc... how to set parameters
Date Tue, 10 May 2011 13:38:19 GMT
after having talked with Claus on IRC i tried to look how to implement his
idea:

from(...).bean(XXX.class, "myMethod(${header.myHeader}, ${body}").to(...).

But i don't understand something: method are managed from BeanInfo and
MethodInfo. Where is the link with the route?

In other word how can i get the "myMethod(${header.myHeader}, ${body}"
string from BeanInfo?

I think BeanInfo should have another cached (method, expressions) list to
manage it.

- Romain

2011/5/8 Romain Manni-Bucau <rmannibucau@gmail.com>

> i did a poc,
>
> i need a modification in camel-core, here is the diff:
>
> Index: src/main/java/org/apache/camel/component/bean/BeanInfo.java
> ===================================================================
> --- src/main/java/org/apache/camel/component/bean/BeanInfo.java (révision
> 1100337)
> +++ src/main/java/org/apache/camel/component/bean/BeanInfo.java (copie de
> travail)
> @@ -289,7 +289,7 @@
>      @SuppressWarnings("unchecked")
>     protected MethodInfo createMethodInfo(Class clazz, Method method) {
>          Class[] parameterTypes = method.getParameterTypes();
> -        Annotation[][] parametersAnnotations =
> method.getParameterAnnotations();
> +        Annotation[][] parametersAnnotations = getAnnotationsFor(method);
>
>         List<ParameterInfo> parameters = new ArrayList<ParameterInfo>();
>          List<ParameterInfo> bodyParameters = new
> ArrayList<ParameterInfo>();
> @@ -338,6 +338,10 @@
>          return new MethodInfo(camelContext, clazz, method, parameters,
> bodyParameters, hasCustomAnnotation, hasHandlerAnnotation);
>      }
>
> +    protected Annotation[][] getAnnotationsFor(Method method) {
> +        return method.getParameterAnnotations();
> +    }
> +
>     /**
>      * Lets try choose one of the available methods to invoke if we can
> match
>       * the message body to the body parameter
>
>
> It is simply adding getAnnotationsFor(Method method) method to allow me to
> override it in a child class.
>
> After this modification i did a component reading a file containing the
> annotation description:
>
> <?xml version="1.0" encoding="UTF-8"?>
> <methods>
>   <method class="org.apache.camel.component.bean.FooBean" name="foo">
>     <parameter index="0" type="java.lang.String">
>       <annotation class="org.apache.camel.Header">
>         <annotation-parameter name="value" value="bar" />
>       </annotation>
>     </parameter>
>     <parameter index="1" type="java.lang.String">
>       <annotation class="org.apache.camel.Body" />
>     </parameter>
>   </method>
> </methods>
>
>
> and i change the behavior of the method i started my mail with to test if
> annotations are defined in a file before returning the array.
>
> To avoid to load the file each time i need it i created a service to do it.
>
> Finally i can do what i want: to use a pojo without any camel import and
> avoiding to create an array to set parameters.
>
> My questions are now:
>
> 1) do you think the method can be created in the trunk?
> 2) i didn't find how to register my service in camel (i added it manually
> in my unit test)
> 3) any thoughts?
>
> PS: i'll upload the code in my repository very soon (
> http://code.google.com/p/rmannibucau/ )
>
> - Romain
>
> 2011/5/8 Romain Manni-Bucau <rmannibucau@gmail.com>:
>
> > Hi,
> >
> > maybe another solution to this problem could be to add a kind of
> > descriptor file:
> >
> > in camel a bean can extract parameters from headers or something else
> > with annotations, if there is a file saying the same thing the bean
> > could not use any camel imports but do the same.
> >
> > what do you think of a file like:
> >
> > <methods>
> >    <method class="aaa" method="bbb">
> >        <parameter index="ccc">
> >              <annotation class="ddd">
> >                  <annotation-parameter name="eee" value="fff" />
> >              </annotation>
> >        </parameter>
> >    </method>
> > </methods>
> >
> > - Romain
> >
> > 2011/5/6 Romain Manni-Bucau <rmannibucau@gmail.com>:
> >> Hi,
> >>
> >> i would like to do a route with a bit more bean invocations than
> >> usually and i realise the use of array body to specify parameters is
> >> not very nice, i always have something like:
> >>
> >> from(...).to(<create my array>).to("bean:...").to(<save my output in
> >> headers and replace the body to continue>)....
> >>
> >> do you  think it could be improved specifying in the bean component
> >> input/output from headers for example?
> >>
> >> example:
> from(...).to("bean:foo.bar.MyClass?method=hello&parameter[0]=header(first)&aprameter[2]=header(other)&result=header(out)").to(...)
> >>
> >> - Romain
> >>
> >
>
>

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