IT-SC book: Advanced CORBA Programming with C++ in Software

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IT-SC book: Advanced CORBA Programming with C++
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17 Type DynAny
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171 Overview
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This chapter discusses the DynAny interface and its derived interfaces The DynAny interface permits you to compose and decompose complex values at run time even without compile-time knowledge of the IDL definitions involved Section 173 presents the IDL and functionality for DynAny and its derived types Section 174 explains how to use DynAny from C++, and Sections 175 and 176 present a few applications of DynAny
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172 Introduction
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As you saw in s 15 and 16, to insert a user-defined value into an Any you must have compile-time knowledge of the corresponding IDL type because to insert a value into an Any, you must use the corresponding overloaded <= operator generated by the IDL compiler This inability to construct Any values on-the-fly is a severe drawback for some applications For example, debuggers, generic user interfaces for objects, and services such as the OMG Notification Service [26] all require the ability to interpret values without knowing the values' IDL types at compile time The DynAny interface was added to CORBA with the 22 revision to permit applications to dynamically compose and decompose any values In a nutshell, the DynAny interface does for any values what the TypeCode interface does for type codes DynAny permits applications to compose a value at run time whose type was unknown when the application was compiled, and to transmit that value as an any Similarly, DynAny allows applications to receive a value of type any from an operation invocation and both to interpret the type of the any (using the TypeCode interface) and to extract its value (using the DynAny interface) without compile-time knowledge of the IDL types involved Unfortunately, the DynAny interfaces published with CORBA 22 contained a number of defects As a result, the interfaces were (incompatibly) revised with CORBA 23, which is the version we describe here If you need to find out which version is supported by your ORB, look for the definition of the DynAny interface If the definition appears inside the DynamicAny module, you have the 23 version; if the definition appears inside the CORBA module, you have the (now obsolete) 22 version The DynAny interface is large, so we follow the same approach here as in 16: we first present the IDL interface for DynAny and then illustrate its use in C++ with a few examples
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IT-SC book: Advanced CORBA Programming with C++
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173 The DynAny Interface
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The DynAny API is composed of nine interfaces One of these, interface DynAnyFactory, allows you to create DynAny objects The other interfaces are DynAny and seven interfaces derived from DynAny, as shown in Figure 171
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Figure 171 Interface inheritance hierarchy for DynAny
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All these interfaces are defined in the DynamicAny module The derived interfaces, such as DynFixed and DynStruct, are used to create any values of the corresponding type (DynStruct is used both for structures and for exceptions) The DynAny base interface deals with any values containing other IDL types, such as strings, object references, and so on[1]
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[1] Note that DynValue represents an any containing an object-by-value Because we do not cover OBV in this book, we do not cover DynValue (see [18] for details)
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1731 Locality Constraints DynAny and DynAnyFactory are locality-constrained interfaces This means that you cannot pass instances of DynFactory or DynAny and its derived interfaces over the wire, and you cannot stringify references to these interfaces with ORB::object_to_string Otherwise, locality-constrained objects are like ordinary objects In particular, they implicitly inherit from Object and therefore support operations such as is_a and is_equivalent DynAny allows you to compose and decompose values of type any To dynamically compose an any value and send it across an interface, you first construct a DynAny object and then extract the corresponding any value from it Similarly, to dynamically decompose an any value, you initialize a DynAny object from the any value and use the DynAny object for decomposition
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