Am 20.07.2015 um 07:33 schrieb Alex Sviridov:
I have a few questions (I found some information but I'm afraid it is old):
2) Does blueprint support generating xml files via annotations like DS. If yes,
then what maven plugin should we use
There is a blueprint-maven-plugin from aries. It supports using JEE
annotations for most of the functionality of blueprint.
Basically the goal is to provide annotations for blueprint that are as
compatible to JEE as possible so people who learned JEE feel at home.
http://aries.apache.org/modules/blueprint-maven-plugin.html
The example below shows a small application that uses just annotations.
In practice you can also add hand written blueprint for things the
plugin does not cover (like e.g. CXF integration).
http://www.liquid-reality.de/display/liquid/2015/03/05/Apache+Karaf+Tutorial+Part+9+-+Annotation+based+blueprint+and+JPA
The plugin works quite well and is already used in production at one of
our customers. The scope of the plugin is limited a bit though.
For example it already supports simple transaction and jpa injections
but it is not yet compatible to Aries JPA 2.
I will probably need to introduce some extension support for the plugin
so people can extend it to support other blueprint namespaces.
So I encourage you to try it out and see if it fits your current needs.
As the code of the plugin is quite small you can also just fork it to
adapt to your internal needs
if something does not work like you want. In that case I would be happy
about feedback or even pull requests so I can add such impovements to
the aries version.
3) What is the influence of using proxies for every service on performance in
comparison with DS?
There is not much performance overhead for proxies. As your service
calls should not be extremely fine grained anyway I do not think you
will notice a problem.
The problem with proxies is more in some other regards. For example
blueprint blocks a service call if a mandatory service goes away. So if
your business code needs to guarantee short response times
this may speak against blueprint.
Proxies also make debugging harder as you often hit the proxy impl code
while stepping thorugh your code.
4) Could anyone provide a link to example of using blueprint of last version?
You can have a look at my Karaf Tutorials. They cover many blueprint
features as well as some of the integrations to other frameworks
blueprint provides.
Starting with my newest Tutorial I will also provide more examples of
DS. My goal is to look into things like security, REST, SOAP.
http://www.liquid-reality.de/display/liquid/Karaf+Tutorials
Christian
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