Medical Imaging Interaction Toolkit  2021.02.99-c7792db0 Medical Imaging Interaction Toolkit
us::ServiceTrackerCustomizer< S, T > Struct Template Referenceabstract

#include <usServiceTrackerCustomizer.h>

Inheritance diagram for us::ServiceTrackerCustomizer< S, T >:

## Public Types

typedef S ServiceType

typedef T TrackedType

typedef ServiceReference< ServiceTypeServiceReferenceType

## Public Member Functions

virtual ~ServiceTrackerCustomizer ()

virtual TrackedType AddingService (const ServiceReferenceType &reference)=0

virtual void ModifiedService (const ServiceReferenceType &reference, TrackedType service)=0

virtual void RemovedService (const ServiceReferenceType &reference, TrackedType service)=0

## Detailed Description

### template<class S, class T = S*> struct us::ServiceTrackerCustomizer< S, T >

The ServiceTrackerCustomizer interface allows a ServiceTracker to customize the service objects that are tracked. A ServiceTrackerCustomizer is called when a service is being added to a ServiceTracker. The ServiceTrackerCustomizer can then return an object for the tracked service. A ServiceTrackerCustomizer is also called when a tracked service is modified or has been removed from a ServiceTracker.

The methods in this interface may be called as the result of a ServiceEvent being received by a ServiceTracker. Since ServiceEvents are synchronously delivered, it is highly recommended that implementations of these methods do not register (ModuleContext::RegisterService), modify ( ServiceRegistration::SetProperties) or unregister ( ServiceRegistration::Unregister) a service while being synchronized on any object.

The ServiceTracker class is thread-safe. It does not call a ServiceTrackerCustomizer while holding any locks. ServiceTrackerCustomizer implementations must also be thread-safe.

Template Parameters
 S The type of the service being tracked T The type of the tracked object.
Remarks

Definition at line 63 of file usServiceTrackerCustomizer.h.

## ◆ ServiceReferenceType

template<class S, class T = S*>
 typedef ServiceReference us::ServiceTrackerCustomizer< S, T >::ServiceReferenceType

Definition at line 67 of file usServiceTrackerCustomizer.h.

## ◆ ServiceType

template<class S, class T = S*>
 typedef S us::ServiceTrackerCustomizer< S, T >::ServiceType

Definition at line 65 of file usServiceTrackerCustomizer.h.

## ◆ TrackedType

template<class S, class T = S*>
 typedef T us::ServiceTrackerCustomizer< S, T >::TrackedType

Definition at line 66 of file usServiceTrackerCustomizer.h.

## ◆ ~ServiceTrackerCustomizer()

template<class S, class T = S*>
 virtual us::ServiceTrackerCustomizer< S, T >::~ServiceTrackerCustomizer ( )
inlinevirtual

Definition at line 69 of file usServiceTrackerCustomizer.h.

## Member Function Documentation

template<class S, class T = S*>
 virtual TrackedType us::ServiceTrackerCustomizer< S, T >::AddingService ( const ServiceReferenceType & reference )
pure virtual

A service is being added to the ServiceTracker.

This method is called before a service which matched the search parameters of the ServiceTracker is added to the ServiceTracker. This method should return the service object to be tracked for the specified ServiceReference. The returned service object is stored in the ServiceTracker and is available from the GetService and GetServices methods.

Parameters
 reference The reference to the service being added to the ServiceTracker.
Returns
The service object to be tracked for the specified referenced service or 0 if the specified referenced service should not be tracked.

## ◆ ModifiedService()

template<class S, class T = S*>
 virtual void us::ServiceTrackerCustomizer< S, T >::ModifiedService ( const ServiceReferenceType & reference, TrackedType service )
pure virtual

A service tracked by the ServiceTracker has been modified.

This method is called when a service being tracked by the ServiceTracker has had it properties modified.

Parameters
 reference The reference to the service that has been modified. service The service object for the specified referenced service.

## ◆ RemovedService()

template<class S, class T = S*>
 virtual void us::ServiceTrackerCustomizer< S, T >::RemovedService ( const ServiceReferenceType & reference, TrackedType service )
pure virtual

A service tracked by the ServiceTracker has been removed.

This method is called after a service is no longer being tracked by the ServiceTracker.

Parameters
 reference The reference to the service that has been removed. service The service object for the specified referenced service.

The documentation for this struct was generated from the following file: