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IT-SC book: Advanced CORBA Programming with C++
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typedef string typedef sequence<OfferId>
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OfferId; OfferIdSeq;
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interface Admin : TraderComponents, SupportAttributes, ImportAttributes, LinkAttributes { // void list_offers( in unsigned long how_many, out OfferIdSeq ids, out OfferIdIterator id_itr ) raises(NotImplemented); void list_proxies( in unsigned long how_many, out OfferIdSeq ids, out OfferIdIterator id_itr ) raises(NotImplemented);
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The list_offers operation returns all offer IDs in the trader database but omits proxy offers The list_proxies operation, on the other hand, returns only the offer IDs for proxy offers and omits normal service offers Both operations create an iterator object for large result sets:
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interface OfferIdIterator { boolean next_n(in unsigned long n, out OfferIdSeq ids); unsigned long max_left() raises(UnknownMaxLeft); void destroy(); };
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The semantics of the iterator operations are the same as for a normal offer iterator (see Section 19113) except that the returned sequences contain offer IDs instead of service offers
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1914 Inspecting Service Offers
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Given an offer ID, you can retrieve the details of the corresponding service offer:
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interface Register : TraderComponents, SupportAttributes { // struct OfferInfo { Object reference; ServiceTypeName type; PropertySeq properties; }; OfferInfo describe(in OfferId id) raises( IllegalOfferId,
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IT-SC book: Advanced CORBA Programming with C++
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UnknownOfferId, ProxyOfferId
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The describe operation returns the complete details for the service offer specified by the id parameter The operation is useful for dumping the complete contents of a trader Because not all service types may have a common root base type, you cannot use the query operation to get the complete set of service offers (The query operation can return only service offers of a particular type and its derived types) Another use for describe is to locate the offer ID of a lost service offer You can use list_offers to iterate over the complete set of offer IDs and invoke describe on each returned offer ID to match the service offer details against the lost service offer Clearly, this technique is cumbersome and inefficient because potentially you must examine all service offers in a trader to recover the lost one Unfortunately, apart from withdraw_using_constraint and this technique, there is no standard way to recover lost offers (but your vendor may offer proprietary tools this purpose)
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1915 Exporting Dynamic Properties
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Support for dynamic properties CosTradingDynamic:
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//File:CosTradingDynamicidl #include <CosTradingidl> #include <orbidl> #pragma prefix "omgorg" module CosTradingDynamic { exception DPEvalFailure { CosTrading::PropertyName CORBA::TypeCode any };
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name; returned_type; extra_info;
interface DynamicPropEval { any evalDP( in CosTrading::PropertyName name, in CORBA::TypeCode returned_type, in any extra_info ) raises(DPEvalFailure); }; struct DynamicProp { DynamicPropEval eval_if; CORBA::TypeCode returned_type; any extra_info; };
IT-SC book: Advanced CORBA Programming with C++
Dynamic property evaluation uses the callback pattern To export a service offer containing a dynamic property, you specify the service offer type as you would for any other service offer For example, the service type for controllers we established earlier does not need to change at all in order for property values to be dynamic However, at export time, the exporter does not supply a value of the offer; instead, the exporter sets the any value for the dynamic property to contain a structure of type DynamicProp The DynamicProp structure must contain an object reference to an object supporting the DynamicPropEval interface in the eval_if member The trader invokes the evalDP operation on that object when it requires the value of the dynamic property You must set the returned_type member to indicate the type of value that evalDP must return when it is called The extra_info member is an any value that you can use to pass additional information to evalDP The trader does not interpret this member in any way but simply passes it to evalDP when it evaluates the dynamic property
Property Name Name Price Table 194 Property definitions for a share service type Property Type Property Mode CORBA::_tc_string Mandatory, read-only CORBA::_tc_ulong Mandatory
After you have exported a dynamic property, the trader invokes the evalDP operation on the reference for the dynamic property whenever it needs to evaluate that property The trader passes the name of the property, the expected type of the value evalDP should return, and the extra_info member that was stored at export time to the operation The return value from evalDP is an any that delivers the property value back to the trader The value returned must match the expected return type indicated by the returned_type parameter If for some reason evalDP cannot evaluate the property, it raises the DPEvalFailure exception (You can fill the exception data members with the values indicated in the IDL However, there is little point, because that exception is never propagated back to the importer This means that you might as well leave the exception members in the defaultconstructed state) The following code fragment illustrates export of a Price property as a dynamic property We assume that a service type StockMarket::Shares already exists and that it has the property definitions shown in Table 194
using namespace CosTrading; using namespace CosTradingDynamic; // Get reference to Register interface Register_var regis = ; // Assume we have a reference to a DynamicPropEval interface