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1761 Type Information from the OMG Interface Repository One option is to consult an interface repository at run time We do not cover the OMG Interface Repository in this book, so we do not present this option in detail Suffice it to say that the Interface Repository (IFR) allows you to discover the complete IDL definition of a type at run time by using the type's repository ID as an index into the Interface Repository The IFR returns object references to type descriptions that fully describe a type This is similar in nature (if not in detail) to the way type codes describe the type of a value The main difference between type codes and the IFR is that the IFR can describe things other than value types, such as interfaces, operations, attributes, and modules Using the IFR, DynAny, and the DII in combination, we can, for example, build a universal CORBA client Given an object reference to an object of arbitrary type, such a universal client extracts the interface definition of the object from the IFR and dynamically constructs a user interface that reflects the operations and attributes of the object We can then enter values into that interface; the universal client uses DynAny to turn these values into parameters for operations that it invokes via the DII 1762 Type Information from Translation Tables Another option is to compose values dynamically by using rules for translating one type system into another For example, a CORBA-CMIP bridge can use the mapping rules defined by the Joint Inter-Domain Management (JIDM) specification [24] [30] to work out how to transform each CORBA request into a Common Management Information Protocol (CMIP) request and vice versa In effect, you configure such a bridge by compiling the relevant IDL or GDMO[5] definitions with a tool that produces output in the form of translation tables or shared libraries to drive the operation of the bridge The bridge uses the fixed translation rules together with the dynamic type information provided by the tool to work out how to convert requests and data types between the two protocols
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[5] GDMO stands for Guidelines for the Definition of Managed Objects It is a type definition language for Open Systems Interconnect (OSI) network management
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1763 Type Information from Expressions The CORBA Notification Service [26] obtains knowledge of the relevant types from its clients Briefly, the OMG Notification Service extends the OMG Event Service (see 20) using the notion of filters A filter is a Boolean expression that determines whether a particular event (which is of type any) will be forwarded by a channel A client installs a filter in a channel by supplying a filter expression such as
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$_repos_id == 'IDL:CCS/Thermostat/BtData:10' and ($requested > 90 or $requested < 20)
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The relevant type information is supplied to the channel as part of the filter expression so that the channel can match any values against the filter Typically, the channel is implemented so that it first creates an abstract syntax tree for the filter expression and then evaluates each node in the tree Because the expression itself contains things such as repository IDs and field names, the channel can evaluate the filter against an any value without requiring additional type information from an interface repository
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177 Summary
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DynAny provides composition and decomposition for values in a way that is analogous to the way TypeCode provides composition and decomposition for types Together, DynAny and TypeCode provide the features required by generic applications that do not have knowledge of the compile-time types of values DynAny was revised with CORBA 23 in a way that is not backward-compatible Before developing code that uses DynAny, you should ensure that you have the 23 version
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