Name Management in Java

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With respect to name management, OpenOODB is similar to many OODBs. In its plain, vanilla form, OpenOODB is limited to a flat-name space for persistent objects. Thus, the OpenOODB API persist and fetch operations assume that all names (for all persistent
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objects) must be unique. Although such schemes are simple to understand, they do not scale for large systems, which may have thousands of nameable persistent objects. Another important characteristic of the default name management mechanism in the OpenOODB (and in OODBs in general) is that the persistent store is segregated according to the language used to define objects. For example, names for persistent C++ objects are not visible to CLOS objects and vice versa. Moreover, not only is the name space segregated, but the data space is segregated as well. For example, persistent CLOS data cannot be accessed by C++ applications, and vice versa. This latter visible seam is addressed in the section on Interoperability. The PolySPIN framework addresses these various seams by providing a uniform, flexible, and powerful approach to name management. Although the details of its interface are beyond the scope of this chapter, the name management mechanism allows names to be assigned to objects in binding spaces (where binding spaces are collections of name-object pairs) and names for objects to be resolved in contexts (where contexts are constructed from existing binding spaces) [Kaplan 94]. In addition, binding spaces may be assigned names, resulting in the ability to organize hierarchically the name space for objects (similar to directory structures found in modern file systems). Coupled with the persistent store, this approach results in a name-based persistence mechanism where any object (and, transparently, all the objects in that object's transitive closure) bound to a name in a binding space reachable from a specially designated root binding space automatically persists. The approach is based on techniques pioneered in Galileo [Albano 1985] and Napier [Morrison 1993], where environments correspond to binding spaces. The name management mechanism in PolySPIN is more general, however, since it supports objects defined in multiple languages. To participate in this mechanism, an object's class definition must inherit from a common base class, designated the NameableObject class. By inheriting from this class, instances of the subclass can be, among other things, named and resolved using the operations supported by the various abstractions that make up the PolySPIN name management mechanism. For example, Figure 14.2 shows a (partial) C++ definition for a Person class, a code fragment illustrating how a name might be assigned to an instance of Person, and a portion of a persistent store organization based on this approach. This more flexible approach to naming clearly eliminates the flat name space seam. It allows OODBs to be organized more effectively and intuitively. Furthermore, it elimi-
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// subclass of NameableObject class Person : public NameableObject { public: int GetAge(); ); BindingSpace* persons; persons = someContext.Resolve ("Persons"); Person alan - new Person (...); // Operation signature for Define is: // BindingSpace::Define(Name&, NameableObject*); Persons>Define ("Alan", alan);
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Using PolySPIN's name management mechanism.
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nates the name segregation seam by providing uniform support for objects defined in multiple languages. Specifically, the same name management mechanism is used to manage both persistent C++ and CLOS objects. A binding space may, for instance, contain bindings to objects that have been defined in different languages. The name management mechanism is also transparent since it can be employed for all objects, independent of whether they are persistent or not. For example, an application may wish to use the name management mechanism as a means of hierarchically organizing a collection of objects. The application may also make the collection persist simply by creating a binding to the collection's root in some persistent binding space.
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