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This design performs much better than a pool of instances, because there is no management of checking the object in and out of the pool Using a singleton for each service object keeps memory usage to a minimum as well This layer attempts to provide encapsulations of all the use cases of the system A single use case is often one transactional unit of work, and so it makes sense these two aspects are found in the service layer It also makes it easy to refer to one layer for all the high-level system functionality Consolidating the units of work behind a service layer creates a single point of entry into the system for end users and clients It now becomes trivial to attach multiple client communication mechanisms to a single service interface.

Figure 5-3. Pull-down and pull-up schematics The enumerating Port.ResistorMode provides the following modes: public enum ResistorMode { Disabled, PullDown, PullUp } The indication of the resistor mode is actually relevant only for the emulator. With the indication of Disabled or PullDown, the port is set to low level. With PullUp, it is set to logical

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For the next version of InterfaceLib.dll, assume that a new function is added to the interface. // interfaceLib.cpp // build with "CL /LD /clr:safe interfaceLib.cpp" public interface class ICar { void Drive(); void Refuel(); }; Removing the Drive method or modifying its signature would obviously be a breaking change. Adding the new method is a breaking change, too. When the new version of InterfaceLib.dll is loaded by the application built against the old version of the DLL, the TypeLoadException shown following will be thrown: Unhandled Exception: System.TypeLoadException: Method 'Refuel' in type 'Car' from assembly 'UsingInterfaceLib, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' does not have an implementation. at main() When main is JIT-compiled, the type Car is used for the first time. Therefore, the type Car must be prepared to be used in managed code. Part of this preparation is the building of the method dispatch tables used when a method is called via an interface. During this preparation, the runtime detects that not all methods of the interface are supported by the class. Therefore, a TypeLoadException is thrown. To solve this problem in an interface-based design, a new interface definition is necessary. This often leads to interface names with numerical suffixes like ICar2. Using abstract base classes, you can prevent the versioning difficulties mentioned here from influencing type naming. Equivalent to the first version of the interface, an abstract base class could be defined like this: public ref class ICar abstract { public: virtual void Drive() abstract; }; When the second version is defined, it can provide a default implementation for all new members. public ref class ICar abstract { public: virtual void Drive() abstract; virtual void Refuel() { /* ... default implementation goes here ... */ } };

For instance, with Spring s remoting capabilities, you can expose the same service via SOAP RMI, Java serialization over HTTP , , and, of course, standard XHTML This promotes code reuse and the all-important DRY (Don t Repeat Yourself) principle by decoupling the transactional unit of work from the transport or user interface For more information on Spring s remoting capabilities, refer to Pro Spring by Rob Harrop (Apress, 2005) or to the online documentation (http://wwwspringframeworkorg/documentation) Example As just mentioned, the service layer provides an interface for clients A typical interface has very coarse-grained methods and usually looks something like Listing 3-1 Listing 3-1 Coarse-Grained Service Layer Interface public interface AccountManager { void activateAccount(String accountId); void deactivateAccount(String accountId); Account findAccountByUsername(String username); } You can see why these methods are considered coarse grained It takes one simple call for the client to achieve completion of a single use case.

high. Disabled does not mean that the port is deactivated, only that there is no pull-up or pulldown resistor wired.

Contrast this to a fine-grained interface (see Listing 3-2), where it would take many calls, to potentially many different objects, to accomplish a use case..

Since the new members do have an implementation now, the type can be prepared without a TypeLoadException. An old client using the new version of the library will automatically use the default implementation. On one hand, abstract base classes allow you to extend existing types in later versions. On the other hand, the single base class restriction forces a developer to derive new classes from an abstract base class instead of implementing an interface in an existing class. In version 2 of the FCL, Microsoft has often favored abstract base classes over interfaces. As an example, ADO.NET 1.0 and 1.1 managed providers defined a set of interfaces like IDbConnection and IDbCommand that an ADO.NET data provider has to implement; in version 2, you have to extend base classes like DbConnection and DbCommand to implement an ADO.NET provider.

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