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A proxy trader adds proxy offer support to a stand-alone trader by also supporting the Proxy interface Full-service trader A full-service trader supports all five of the main interfaces, possibly adding support for dynamic properties 1962 Abstract Base Interfaces The base interfaces for the trader use inheritance to group common functionality that is required by the main interfaces That is, the base interfaces are used as mix-in interfaces
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The SupportAttributes Interface
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interface SupportAttributes { readonly attribute boolean supports_modifiable_properties; readonly attribute boolean supports_dynamic_properties; readonly attribute boolean supports_proxy_offers; readonly attribute TypeRepository type_repos; };
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All five of the main interfaces inherit from SupportAttributes The interface contains the type_repos attribute so that clients can obtain a reference to the type repository (see Section 1954) The remaining three attributes indicate the level of support provided by this trader For example, the supports_modifiable_properties attribute is true only if this trader permits updates of properties in place The SupportAttributes interface permits clients to obtain the level of support available from their trader at run time and to dynamically adjust their behavior according to the level of support
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The TraderComponents Interface
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interface TraderComponents { readonly attribute Lookup readonly attribute Register readonly attribute Link readonly attribute Proxy readonly attribute Admin };
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lookup_if; register_if; link_if; proxy_if; admin_if;
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All five of the main interfaces inherit from TraderComponents The interface is a navigation interface Given an object reference to an arbitrary trader interface, you can navigate to any one of the other interfaces by reading the appropriate attribute
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The main motivation for the TraderComponents interface is to avoid adding too many service name tokens to resolve_initial_references Recall from Section 195 4 that only a single token is defined for the trader namely, "TradingService" This token returns a Lookup interface, which in turn provides access to the remaining interfaces Without this design, the specification would have had to add five new tokens to resolve_initial_references (six tokens if you count the type repository) If a trader does not support the full functionality of the specification, the corresponding attribute contains a nil reference For example, if a trader does not support federation, the link_if attribute is nil
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The ImportAttributes Interface
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enum FollowOption { local_only, if_no_local, always }; interface ImportAttributes { readonly attribute unsigned long readonly attribute unsigned long readonly attribute unsigned long readonly attribute unsigned long readonly attribute unsigned long readonly attribute unsigned long readonly attribute unsigned long readonly attribute unsigned long readonly attribute unsigned long readonly attribute FollowOption readonly attribute FollowOption }; def_search_card; max_search_card; def_match_card; max_match_card; def_return_card; max_return_card; max_list; def_hop_count; max_hop_count; def_follow_policy; max_follow_policy;
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The ImportAttributes interface allows importers to inquire about the setting of the import policies of a trader We cover these policies in Section 19116
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The LinkAttributes Interface
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interface LinkAttributes { readonly attribute FollowOption max_link_follow_policy; };
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The LinkAttributes interface contains a single attribute that informs a client of the federation policy limit established by this trader (see Section 19161) 1963 Iterators
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interface OfferIterator { unsigned long max_left() raises(UnknownMaxLeft); boolean next_n(
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); destroy();
in unsigned long out OfferSeq
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interface OfferIdIterator { unsigned long max_left() raises(UnknownMaxLeft); boolean next_n( in unsigned long n, out OfferIdSeq ids ); void destroy(); };
These iterator interfaces are provided by all traders and permit you to retrieve a large result set incrementally The OfferIterator interface is for use with service offers, whereas OfferIdIterator retrieves the internal identifiers a trader uses to identify its service offers We show how to use these iterators in Section 19113 and Section 19132 1964 Common Types The CosTrading module defines a number of common types and exceptions that are used by the main interfaces Instead of presenting all of these type definitions together, we show them as we discuss the various operations For the remainder of this chapter, whenever we show IDL definitions, they are nested inside the CosTrading module unless we indicate otherwise