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1931 Basic Trading Concepts Here are some of the fundamental concepts and terms used in trading A trader stores advertisements for services A stored advertisement is known as a service offer A service offer contains a description of the service as well as an object reference to an object that provides the service Service offers also have a specific service type, which we discuss in the next section The act of placing an advertisement is known as an export operation The program or person who places the advertisement is called the exporter The object reference inside a service offer denotes an object that provides the advertised service That object is known as the service provider After a service offer is exported, the service provider is immutable You cannot change the object reference inside a service offer without deleting the offer and re-exporting it The description of the service inside a service offer (the "text" of the ad) is provided by a number of name value pairs called properties In contrast to the service provider, property values can be updated in place There is no need to delete and re-export an offer in order to update a service description The same service provider can be advertised multiple times, typically with different property values Drawing on the Yellow Pages analogy, this corresponds to advertising the same shop or service under different categories A number of advertisements can have the same property values but different service providers This corresponds to a single advertisement that lists multiple shops at different locations, as is often the case with franchises Advertisements can be withdrawn, that is, deleted from a trader Advertisements can be exported or withdrawn by a party other than the service provider The act of searching the trader for a service provider that meets certain criteria is known as an import These few explanations give you a basic picture of a trader At the most basic level, a trader is a database that stores object references that are described by properties We can export (add) new object references and their descriptions and withdraw (delete) them In addition, we can update the properties (description) without deleting an offer, but we cannot update the service provider (the object reference) without deleting and re-creating an offer 1932 Service Types and IDL Interface Types
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Service offers have a type, known as the service type The service type loosely corresponds to the categories of a Yellow Pages phone book For example, if we look up tire shops in a Yellow Pages phone book, we expect a certain amount of information that is common to all tire shops, such as name, phone number, address, range of brands offered, and credit cards accepted The service type of a service offer determines the information an importer can expect to be available in other words, the properties available to search for tire shops The service type can also be compared to a database table definition If we assume that all service offers of a particular type are stored in a single table, then the service type determines the name, number, and type of the columns in the table For example, for tire shops we might have a table that specifies columns called Name, Address, Phone, Brands, and CreditCards The name of the table itself could be TireShops and would correspond to the name of the service type The object reference to the service provider that is stored in each service offer also has a type: the IDL interface type Whereas the service type determines which properties are used to describe particular service offers, the IDL interface type determines the type of object that provides the actual service For example, the IDL interface for objects that provide a tire shop service could be Shops::Tires (In older literature, you may see the IDL interface type referred to as the service offer type, which is not the same as the service type) You can group service types into hierarchies using inheritance If an importer requests service offers of a specific type, the trader will return not only matching service offers of the specified type but also service offers that have a type derived from the specified type In other words, service offers obey the usual type compatibility rules of object-oriented type systems namely, that a derived type can be substituted where a base type is expected To protect the importer from surprises, the IDL interface type of a derived service type must be compatible with (must be the same as or be derived from) the IDL interface type of the base service type Service types correspond loosely to database table definitions, with one difference: whereas database tables have a fixed number of columns, the trader allows the exporter to export properties for which no corresponding definition exists This loosely corresponds to exports being able to append additional columns to tables at run time We discuss this feature in detail in Section 1973 1933 Service Requests To search a trader for a particular service, the importer submits a service request to the trader A service request contains The service type, such as TireShops A constraint expression, which controls which particular shops should be returned
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