CoreandServices.book - Ocean - Schlumberger

ServiceLocator Class
ServiceLocator Class
Ocean provides services to satisfy commonly requested functionality. A service is an object
that provides custom support to other objects, e.g. UnitService or
CoordinateSystemService, and may also be made available in third party modules.
Services may be of two types. First are those that are handled by System interfaces in the
.NET framework. Second are services that are identified by the type of service and the
type of object that needs the service.
Services provided by the product family, such as the unit or coordinate system services,
are made available at startup. You may create services to work with objects created by
your modules. In such cases, your services should be added in your modules
Initialize method. You may acquire services for use after modules have been
initialized, typically in the Integrate method.
The CoreSystem.Services property is a ServiceLocator class that manages services.
ServiceLocator supports a mechanism for registering and looking up service objects
(Fig. 3-12 on page 3-71). Its purpose is to locate service instances for services requested
by your modules. It supports three use cases including lookup by a service type, lookup for
an object, and lookup for a given data type. ServiceLocator will inspect the
inheritance hierarchy to find the best matching service when looking up services for type
and object instances.
CoreSystem
ServiceLocator
Fig. 3-12 Core System Access to ServiceLocator
Schlumberger Private
Ocean Core 3-71