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package org.apache.tuscany.sca.osgi.remoteserviceadmin;
import org.osgi.framework.ServiceReference;
/**
* An Import Registration associates an active proxy service to a remote
* endpoint.
*
* The Import Registration can be used to delete the proxy associated with an
* endpoint. It is created with the{@link RemoteServiceAdmin#importService}
* method.
*
* @ThreadSafe
*/
public interface ImportRegistration {
/**
* Answer the associated Service Reference for the proxy to the endpoint.
*
* @return A Service Reference to the proxy for the endpoint.
* @throws IllegalStateException Thrown when this object was not properly initialized, see {@link #getException()}
*/
ServiceReference getImportedService();
/**
* Answer the associated remote Endpoint Description.
*
* @return A Endpoint Description for the remote endpoint.
* @throws IllegalStateException Thrown when this object was not properly initialized, see {@link #getException()}
*/
EndpointDescription getImportedEndpointDescription();
/**
* Unregister this Import Registration. This must close the connection
* to the end endpoint unregister the proxy. After this method returns,
* all other methods must return null.
*
* This method has no effect when the service is already unregistered or in the process off.
*/
void close();
/**
* Exception for any error during the import process.
*
* If the Remote Admin for some reasons is unable to create a registration,
* then it must return a <code>Throwable</code> from this method. In this
* case, all other methods must return on this interface must thrown an
* Illegal State Exception. If no error occurred, this method must return
* <code>null</code>.
*
* The error must be set before this Import Registration is returned.
* Asynchronously occurring errors must be reported to the log.
*
* TODO can we assume the proxy service is registered when getException==null?
*
* @return The exception that occurred during the creation of the
* registration or <code>null</code> if no exception occurred.
*/
Throwable getException();
}
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