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thermometer into the input sequence (at least with the C++ mapping, which is statically type-safe) If one or more of the thermostats cannot make the requested change, an EChange exception is raised The exception contains the single data member errors, which is a sequence of error reports Each error report in turn contains the object reference of the thermostat that encountered the problem (in the member tmstat_ref) together with the details of the exception raised by that thermostat (in the member info) The find operation permits searching for devices by asset number, location, or model number An enumerated type indicates the type of search, and the search key is supplied as a union:
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interface Controller { // enum SearchCriterion { ASSET, LOCATION, MODEL }; union KeyType switch(SearchCriterion) { case ASSET: AssetType asset_num; case LOCATION: LocType loc; case MODEL: ModelType model_desc; }; // };
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The find operation expects a sequence of pairs of search key and object references:
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interface Controller { // struct SearchType { KeyType key; Thermometer device; }; typedef sequence<SearchType> SearchSeq; void find(inout SearchSeq slist); // };
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For instructional purposes, we have made the definition of this operation unnecessarily complicated A more realistic approach would split find into three separate operations (one for each type of search) and would return the matching object references as the return value (instead of using an inout parameter) To locate one or more devices, the caller supplies a sequence of type SearchSeq The sequence contains one element for each search key This permits the caller to search for devices by several search criteria in a single call For example, to locate all devices in
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Room 414 or with the asset number 123, the caller creates a sequence with two elements, one for each search criterion The find operation looks for the devices nominated by the search keys If a matching device is found, it overwrites the device member in the SearchType structure with the object reference of the matching device If no matching device is found, the device member is set to the nil reference to indicate a failed search for this key to the caller The initial value of the device member (as sent by the client) is ignored Figure 52 shows an example in which the client supplies two search records One record looks for devices in Room 414, and the other record looks for the device with asset number 123 Assume that no devices are in Room 414 but that a device with asset number 123 actually exists The corresponding search sequence is shown before and after the call
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Figure 52 Search sequence before and after a call
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Some search keys can result in more than one matching device For example, we may have two model Sens-A-Temp thermometers in the system In this case, the find operation increases the length of the inout sequence to return the matching devices, as shown in Figure 53
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Figure 53 Growing a search sequence
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All that remains is to combine the preceding pieces of IDL into a single specification As good IDL citizens, we wrap everything in a module called CCS and use a pragma to establish a unique prefix for repository IDs:
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#pragma prefix "acmecom" module CCS { typedef unsigned long AssetType; typedef string ModelType; typedef short TempType; typedef string LocType; interface Thermometer { readonly attribute ModelType model; readonly attribute AssetType asset_num; readonly attribute TempType temperature; attribute LocType location; }; interface Thermostat : Thermometer { struct BtData { TempType requested; TempType min_permitted; TempType max_permitted; string error_msg; }; exception BadTemp { BtData details; }; TempType get_nominal(); TempType set_nominal(in TempType new_temp) raises(BadTemp); }; interface Controller { typedef sequence<Thermometer> ThermometerSeq; typedef sequence<Thermostat> ThermostatSeq; enum SearchCriterion { ASSET, LOCATION, MODEL }; union KeyType switch(SearchCriterion) { case ASSET: AssetType asset_num; case LOCATION: LocType loc; case MODEL: ModelType model_desc; }; struct SearchType { KeyType key; Thermometer device; }; typedef sequence<SearchType> SearchSeq; struct ErrorDetails { Thermostat tmstat_ref; Thermostat::BtData info; }; typedef sequence<ErrorDetails> ErrSeq; exception EChange { ErrSeq errors; };
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