Hi Jan,
If you have a dependency on two services of the same type, you can use the
setAutoConfig(String) property on the dependency: this allows you to set the
name of the member you want the dependency injected into.
So, given a consumer class
class PinConsumer {
private volatile IGPIOPin fanPin;
private volatile IGPIOPin dispenserPin;
// And more!
}
you would have Activator code that looks like
dependencyManager.add(createComponent()
.setInterface(Object.class.getName(), null)
.setImplementation(PinConsumer.class)
.add(createServiceDependency()
.setService(IGPIOPin.class, "&((" + Constants.OBJECTCLASS +
"=" + IGPIOPin.class.getName() + ")(PinNumber=1))")
.setRequired(true)
.setAutoConfig("fanPin"))
.add(createServiceDependency()
.setService(IGPIOPin.class, "&((" + Constants.OBJECTCLASS +
"=" + IGPIOPin.class.getName() + ")(PinNumber=2))")
.setRequired(true)
.setAutoConfig("dispenserPin"))
.add(createServiceDependency().setService(LogService.class)));
Remember to include the ObjectClass in the filter, as you override the service
filter that would normally be created, and you could end up with any other
service that has the PinNumber property set to 1.
Angelo
> On 11 Mar 2015, at 22:46, Jan J. Roman <[email protected]> wrote:
>
> Hello,
>
> I am exploring possibility of using felix and osgi in general for
> developing home automation project on raspberry pi.
>
> I created PinService of which one instance reflects one physical pin on
> RPI. Instances are identified by property value. Now I am building service
> which relay on two pins so I need two instances of PinServiceImpl in one
> activator.
>
> I am using Felix Dependency Manager to simplify dependencies and to inject
> services. Below is a code that I am working with however it is not ideal as
> it uses two different classes to inject one service to each class. I would
> like to have two instances injected into one class.
>
> Is there out of the box way to achieve this?
> Is there better way to manage dependencies in osgi & felix?
>
> in Activator:
>
> public void init(BundleContext bundleContext, DependencyManager
> dependencyManager) throws Exception {
> {
> dependencyManager.add(createComponent()
> .setInterface(Object.class.getName(), null)
> .setImplementation(PinConsumerFan.class)
> .add(createServiceDependency()
> .setService(IGPIOPin.class,
> "(PinNumber=1)")
> .setRequired(true))
>
> .add(createServiceDependency().setService(LogService.class))
> );
> dependencyManager.add(createComponent()
> .setInterface(Object.class.getName(), null)
> .setImplementation(PinConsumerDispenser.class)
> .add(createServiceDependency()
> .setService(IGPIOPin.class,
> "(PinNumber=2)")
> .setRequired(true))
>
> .add(createServiceDependency().setService(LogService.class))
> );
> }
>
> Thanks in advance for any hints.
>
> Regards
> Jan Roman
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
