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https://issues.apache.org/jira/browse/PIVOT-885?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13576872#comment-13576872
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Karel Hübl commented on PIVOT-885:
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I made prototype of simple java (client) to java (server) RMI using HTTP. This
mades me reimplement DI to be usable on server side and independent on Pivot
collections.
Change in dependency injection and BeanFactory
The main change is, change of BeanInjector.injectDependencies method signature.
Instead of passing Pivot namespace as parameter (the only dependency on Pivot
collections), InjectorEventDispatcher is passed.
InjectorEventDispatcher enables registration of InjectionListers. This is used
by InjectionSerialiser (deployed only on client) to add injected properties to
namespace.
Transparent service invocation and RMI
Business logic is typically implemented by service layer. Business layer
interface should be represented by set of service interfaces. In enterprise
environment, I believe, pivot is targeted as GUI for thin clients, so
implementation of service layer is deployed on server (typically J2EE). In
development phase it may be usefull to not depend on server part (use mock
services) or do not wait for redeployment of server layer. And sometimes we
may want to implement thick clients. So our Pivot App should depend on service
interfaces - and service implementation may be injected in runtime based on
configuration. The provided implementation may be mock, service instance or
service delegate instance handling RMI.
I propose @Service annotation to mark fields for injection of services.
RemoteServiceProxyFactory is prototype of ServiceFactory providing dynamic
service delegate proxies handling RMI of services on J2EE server over HTTP.
RMIServlet can be used as prototype endpoint.
I am attachinng my proposals to extend Pivot in above areas in attached
archived eclipse projects.
There is very simple Pivot application demonstrating proposed features in
extensions-sample.zip. In
extensions-sample-client\src\org\apache\pivot\extensionsSample\launcher are
executable launchers with diferent configs (mock, local, dynamic service
delegate proxy).
> Add support for dependecy injection
> -----------------------------------
>
> Key: PIVOT-885
> URL: https://issues.apache.org/jira/browse/PIVOT-885
> Project: Pivot
> Issue Type: New Feature
> Reporter: Karel Hübl
> Assignee: Sandro Martini
> Fix For: 2.1
>
> Attachments: extensions-sample.zip, pivot-extensions.zip
>
>
> As pivot application devoloper, I would like to have support for dependency
> injection in Pivot. My requirements are:
> - support for field injection (at least)
> - support for @PostConstruct methods
> - support for @RuntimeScoped classes - only one instance may be constructed
> during Runtime. Usefull when one needs share injected instances.
> - in relevant cases, inject dependencies also into namespace.
> I implemented prototype of this functionality, source codes including unit
> tests and sample application are included. The dependency injection is
> implemented in proposed org.apache.pivot.beans.injection package.
> Please consider adding this functionality in future Pivot release.
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