What are CORBA Services?
Another important part of the CORBA standard is the definition of a set of distributed services to support the integration and interoperation of distributed objects. As depicted in the graphic below, the services, known as CORBA Services or COS, are defined on top of the ORB. That is, they are defined as standard CORBA objects with IDL interfaces. As such, the services are sometimes referred to as "Object Services."
There are several CORBA services. Here is a one line description of most of the services:
|Object life cycle||defines how CORBA objects are created, removed, moved, and copied|
|Naming||defines how CORBA objects can have friendly symbolic names|
|Events||decouples the communication between distributed objects|
|Relationships||provides arbitrary typed n-ary relationships between CORBA objects|
|Externalization||coordinates the transformation of CORBA objects to and from external media|
|Transactions||coordinates atomic access to CORBA objects|
|Concurrency Control||provides a locking service for CORBA objects in order to ensure serializable access|
|Property||supports the association of name-value pairs with CORBA objects|
|Trader||supports the finding of CORBA objects based on properties describing the service offered by the object|
|Query||supports queries on objects|