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19213 Importing a Reference to the Controller The client code imports the controller reference during start-up We are using a manifest constant as the query string for this example, whereas a more realistic client would probably allow the query to be parameterized by, for example, obtaining user preferences via a graphical user interface Unfortunately, the trader accepts as queries only strings and not expression trees This means that to parameterize a query, you must write string manipulation code, which can end up being complex Depending on your requirements, it may be sufficient to create a few simple query templates that allow the user to supply only a fixed number of predetermined property values
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#include <CosTradinghh> // using namespace CosTrading; // Get reference to Lookup interface Lookup_var lookup; lookup = resolve_init<Lookup>(orb, "TradingService"); // The policy sequence sets the return cardinality to // because we are interested only in a single offer PolicySeq policies; policieslength(1); policies[0]name = CORBA::string_dup("return_card"); policies[0]value <= (CORBA::ULong)1; Lookup::SpecifiedProps desired_props; desired_props_default(); desired_props_d(Lookup::none); PolicyNameSeq_var OfferSeq_var OfferIterator_var policies_applied; offers; iterator; // Don't return properties 1 // ORB_specific
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// Run query without preferences using default policies lookup->query( "CCS::Controllers", "Model == 'BFG-9000'", "", policies, desired_props, 1, offers, iterator, policies_applied ); // Process results CCS::Controller_var ctrl; if (offers->length() == 0) { cerr < "Cannot locate matching controller" < endl; exit(1); } else { // Extract controller reference from returned offer ctrl = CCS::Controller::_narrow(offers[0]reference); if (CORBA::is_nil(ctrl)) { cerr << "Service provider is not a controller!" < endl;
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// Use controller
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The OMG Trading Service provides a flexible and dynamic object discovery mechanism that enables clients to choose objects that are most suitable for delivering a particular service Dynamic properties and proxy offers provide even more flexible object selection mechanisms and can be used to integrate knowledge held in legacy systems into a CORBA framework The federation capabilities of traders make it possible to build trading networks that scale to very large sizes Such trading networks are likely to increase in popularity and importance as trade barriers are removed and electronic commerce applications become more wide-spread
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20 The OMG Event Service
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This chapter describes the OMG Event Service, which allows applications to use a decoupled communications model rather than strict client-to-server synchronous request invocations After the introduction, we explain in Section 203 why using the Event Service can be beneficial to applications by discussing the pros and cons of distributed callbacks Section 204 defines the event delivery models that event-based applications can employ Section 205 shows the IDL interfaces supplied by the Event Service, and Section 206 provides examples of how to implement the event delivery models Finally, Sections 207 and 208 discuss how to choose the best event model for your application and describe some of the limitations of the Event Service
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202 Introduction
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All the examples in the previous chapters are based on synchronous request invocations With synchronous requests, a client actively invokes requests on passive servers; after sending a request, the client blocks waiting for the response Clients are aware of the destinations of requests because they hold object references to the target objects, and each request has a single destination denoted by the object reference used to invoke it If the target object no longer exists or for some reason is unreachable, the invoking client receives an exception Many distributed applications find the synchronous request invocation model too restrictive despite its obvious utility These applications generally require a means of decoupling the suppliers of information from the consumers interested in it For example, in our climate control system we might want to have the thermometers send alarm messages if the temperature falls below or rises above a specified range, or we might want to be notified if a thermostat is set too high or too low Making the Thermometer and Thermostat objects responsible for disseminating these messages to all interested parties unnecessarily complicates their implementations, and it scales poorly as the number of interested consumers rises The OMG Event Service provides support for decoupled communications between objects It allows suppliers to send messages to one or more consumers with a single call In fact, suppliers using an implementation of the Event Service need not be aware of any of the consumers of its messages; the Event Service acts as a mediator that decouples suppliers from consumers An Event Service implementation also shields suppliers from exceptions resulting from any of the consumer objects being unreachable or poorly behaved
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