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IllegalConstraint The constraint string passed to the query is syntactically malformed or contains a semantic error (such as comparing a string for equality with a number) DuplicatePolicyName The policies parameter contains two or more elements that have the same policy name IllegalPreference The string passed in the pref parameter is syntactically invalid or contains a semantic error IllegalPolicyName The policies parameter contains a policy name that is syntactically malformed or is not recognized by the trader PolicyTypeMismatch A policy value has a type that does not match the expected type for that policy InvalidPolicyValue A policy value is out of range or otherwise considered meaningless 19112 Writing a Simple Query Following is a simple query to locate a service offer for a controller
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using namespace CosTrading; // Get reference to Lookup interface Lookup_var lookup; lookup = resolve_init<CosTrading::Lookup>(orb, "Tradi ngService"); PolicySeq policies; Lookup::SpecifiedProps desired_props; desired_props_default(); desired_props_d(Lookup::none); PolicyNameSeq_var OfferSeq_var OfferIterator_var policies_applied; offers; iterator; // Empty sequence // Don't return properties
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// out param // out param // out param
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// Run query without preferences using default policies lookup->query( "CCS::Controllers", "TRUE", "", policies, desired_props, 1, offers, iterator, policies_applied ); // Process results CCS::Controller_var ctrl; if (offers->length() == 0) {
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cout < "No matching service offer" < endl; } 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; throw 0; }
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// Clean up if (!CORBA::is_nil(iterator)) iterator->destroy(); // Use controller
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This code goes through the following steps: Step 1 Get a Lookup reference from resolve_initial_references (We use the resolve_init template function defined in Section 18141) Step 2 Initialize a SpecifiedProps union For this example, we set the discriminator to none, which indicates that we do not want property values to be returned Step 3 Invoke the query operation We specify "CCS::Controllers" as the service type and "TRUE" as the constraint, so any controller at all will match the constraint The third parameter is an empty string (indicating that the default preferences apply), and the fourth parameter is an empty policy sequence (indicating that the default policies apply) The desired_props parameter, initialized in step 2, indicates that no property values are to be returned The how_many parameter is 1, and that guarantees that the sequence of matching offers returned in the offers parameter will contain no more than one service offer Step 4 After the call completes, the code checks the length of the returned offer sequence If the sequence is empty, no matching controllers were found Otherwise, the offer sequence contains exactly one element (because how_many was set to 1 for the call) and the code narrows the reference contained in the service offer to the CCS::Controller type The actual type of the reference may be derived from CCS::Controller; if it is, the _narrow call still succeeds Step 5 The trader may have created an iterator to hold other matching service offers If it has, the code immediately destroys the iterator because it is not interested in any other matching service offers 19113 The OfferIterator Interface
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We may be interested in finding all controllers that match the constraint instead of only a single one As with the Naming Service, this creates the problem of how to return result sets of arbitrary size from an operation The trader uses an iterator interface that is similar, but unfortunately not identical, to that of the Naming Service Here are the semantics of the how_many parameter and the OfferIterator interface The offer sequence returned by query contains no more than how_many elements If how_many is set to zero, the returned offer sequence is guaranteed to be empty and results must be retrieved via the iterator The trader may return fewer than how_many offers in the offer sequence If how_many is non-zero, the offer sequence is empty only if there are no matching results If how_many is zero, you use the returned iterator (if any) to determine how many results there are If not all matching offers are returned in the offer sequence, the offer_itrout parameter is used to retrieve the remaining offers The OfferIterator interface is specified by the following IDL
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// In module CosTrading exception UnknownMaxLeft {}; interface OfferIterator { boolean next_n(in unsigned long n, out OfferSeq offers); unsigned long max_left() raises(UnknownMaxLeft); void destroy(); };
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The next_n operation returns the next batch of no more than n matching offers in the offers parameter As with query, fewer than n offers may be returned (but offers is guaranteed to always contain as least one offer) The return value is true if further offers are to be retrieved A return value of false indicates that this invocation of next_n returned the final batch of offers; that is, the offers parameter will contain at least one matching offer even when the return value is false Calling next_n after it has returned false has undefined behavior The max_left operation indicates how many offers are still remaining If that determination cannot be made, the operation raises the UnknownMaxLeft exception (We recommend that you do not use max_left Because of the lazy evaluation used by most trader implementations, it is highly likely that it will raise UnknownMaxLeft whenever it is called) The destroy operation destroys the iterator You can call destroy at any time, even before you have retrieved all results, but you must call destroy even if you do retrieve all results If you don't call destroy, you will leave an abandoned object in the trader
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