Hi Godwin,
You can track all OSGI Service implementations which implements a
particular interface and then select the required service out of them.
Following is a sample. In this sample addMessageSendingModule and
removeMessageSendingModule are binded to add and remove services which
implements interface
"org.wso2.carbon.identity.application.message.mgt.MessageSendingModule".
At the time of "addMessageSendingModule" execution you can get information
about particular service and decide functionality over it.
/**
* @scr.reference name="ldap.tenant.manager.listener.service"
*
interface="org.wso2.carbon.identity.application.message.mgt.MessageSendingModule"
* cardinality="0..n" policy="dynamic"
* bind="addMessageSendingModule"
* unbind="removeMessageSendingModule"
* @scr.component name="identity.application.message.mgt" immediate="true"
*/
@SuppressWarnings("unused")
public class ApplicationMessageMgtServiceComponent {
private List<MessageSendingModule> messageSendingModules = new
ArrayList<MessageSendingModule>();
protected void activate(ComponentContext ctxt) {
// Activate logic goes here
}
protected void deactivate(ComponentContext ctxt) {
// Deactivate logic goes here
}
/**
* Will register message sending modules dynamically. This method is
used
* to bind the notification sending modules to msg mgt component
*
* @param module MessageSendingModule
*/
protected void addMessageSendingModule(MessageSendingModule module) {
if (log.isDebugEnabled()) {
log.debug("Registering a message sending module " +
module.getModuleName());
}
if (configBuilder != null) {
module.init(configBuilder.getProperties(module.getModuleName()));
messageSendingModules.add(module);
}
}
/**
* This method is used to unbind notification sending modules. Whenever
* a module is dynamically deactivated, this method will unregister
them.
*
* @param module MessageSendingModule
*/
protected void removeMessageSendingModule(MessageSendingModule module) {
if (log.isDebugEnabled()) {
log.debug("Removing a message module " +
module.getModuleName());
}
messageSendingModules.remove(module);
}
On Mon, Nov 17, 2014 at 11:18 AM, Godwin Amila Shrimal <[email protected]>
wrote:
> Hi
>
> Most of the time we are having one OSGI Service implementation in carbon
> products. There are situation we require to have multiple OSGI
> implementations. Then how can we add declarative reference to particular
> service implementation.
>
> Thanks
> Godwin
>
> --
> *Godwin Amila Shrimal*
> Senior Software Engineer
> WSO2 Inc.; http://wso2.com
> lean.enterprise.middleware
>
> mobile: *+94772264165*
> linkedin: *http://lnkd.in/KUum6D <http://lnkd.in/KUum6D>*
> twitter: https://twitter.com/godwinamila
>
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>
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