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In the climate control system, it is unlikely that we will need to frequently add large numbers of devices However, for more ephemeral objects for example, objects representing Web pages we may find that having to send a separate message for each object to be created is too slow In this case, we can choose to define an operation that creates objects in bulk:
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module CCS { //
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exception DuplicateAsset {}; typedef sequence<Thermometer> ThermometerSeq; struct InitTherm { AssetType anum; LocType loc; }; typedef sequence<InitTherm> InitThermSeq; interface BulkThermometerFactory { ThermometerSeq create(in InitThermSeq details) raises(DuplicateAsset, Thermostat::BadTemp); }; // };
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Instead of passing the initial state for a single thermometer to the create operation, we pass a sequence of InitTherm structures, one for each thermometer to be created The operation creates as many CORBA objects as there are elements in the details sequence and returns their references The main advantage of this design is that it reduces messaging overhead and is therefore more efficient On the downside, it makes error handling more complex For example, if one of the InitTherm structures contains an invalid temperature, it is no longer clear which particular structure caused the problem unless we also add additional information to the data returned by a BadTemp exception Your application may not need to distinguish the offending entry, but the example shows that bulk operations also add new failure semantics to the system that may require precise handling
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Yet another variation on the object creation theme is the following:
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// As before interface BulkThermometerFactory { void create(in InitThermSeq details) raises(DuplicateAsset, Thermostat::BadTemp); };
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The only difference between this version and the preceding version is that the create operation has no return value The assumption built into this design is that after creating the devices, the client will use the list or find operation on the controller to acquire the device references Again, whether this design is appropriate depends entirely on how we anticipate that the application will be used For example, this version is appropriate if we use separate clients for the creation and the monitoring of devices If special-purpose clients only create devices and do not monitor them, there is little point in returning object references to the clients because they would simply ignore them
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The preceding discussion of design options applies not only to factories but also to almost every object system that uses more than one type of object If the different objects in the system need to communicate with one another, the design of the IDL interfaces has profound influence on the system's ease of use for clients as well as its reliability, its performance, and its physical architecture If nothing else, the preceding discussion should make it clear that it pays to think before deciding on a particular interface design In particular, an object model that may be perfectly appropriate inside a C++ program may disappoint you if you naively translate it into its IDL equivalent What is appropriate for C++ is not necessarily appropriate for CORBA In particular, the cost of sending a remote message over a network is orders of magnitude larger than the cost of a C++ method invocation As a result, not only is it important for you to choose the correct communication model between interfaces, but it is also important that you correctly distribute interface instances over physical server processes If you implement objects that require a high message exchange rate in different servers, performance will be reduced accordingly In a sense, the preceding should not come as a surprise Interface design has profound influence on system performance in most environments, and CORBA is no exception Because this book is not about object-oriented design, we say little more about this topic in the remaining chapters You can consult any number of books to learn more However, we briefly return to the cost of remote messages in 22 1232 Implementing Factories with C++ For the remainder of this chapter, we use persistent objects for our climate control system In addition, we use a servant manager to bring servants into memory on demand These choices require a number of changes to the climate control system The controller must maintain a list of asset numbers on secondary storage to keep track of known devices This is necessary because otherwise, the list operation cannot be implemented (the ICP network does not support discovery) For this simple example, we read the complete list of asset numbers from a file in the controller's constructor and write the list of asset numbers back to the file in the destructor (A more realistic application would update the list on secondary storage immediately when a device is added or removed) You can find the class definition for the Controller_impl servant in Section 10111 Here is the code for the constructor:
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Controller_impl:: Controller_impl( PortableServer::POA_ptr poa, const char * asset_file ) throw(int) : m_poa(PortableServer::POA::_duplicate(poa)), m_asset_file(asset_file) { fstream afile(m_asset_file, ios::in|ios::out, 0666);
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