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7.3.2 @OneToMany and @ManyToOne As you might have gathered from the ActionBazaar domain model in figure 7.3, one-to-many and many-to-one relationships are the most common in enterprise systems. In this type of relationship, one entity will have two or more references of another. In the Java world, this usually means that an entity has a collection-type field such as java.util.Set or java.util.List storing multiple instances of another entity. Also, if the association between two entities is bidirectional, one side of the association is one-to-many and the opposite side of the association is many-to-one. In figure 7.6, the relationship between Bid and Item is one-to-many from the perspective of the Item object, while it is many-to-one from the perspective of

Figure 7.6 Every Item has one or more Bids where more than one Bid may be placed on an Item. Therefore, the relationship between Item and Bid is one-to-many whereas the relationship between Bid and Item is many-to-one.

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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 ... */ } };

the Bid. Similar to the one-to-one case, we can mark the owning side of the relationship by using the mappedBy column on the entity that is not the owner of the relationship. We ll analyze these relationships further by actually coding the BidItem relationship (see listing 7.8).

@Entity public class Item { @Id protected Long itemId; protected String title; protected String description; protected Date postdate; ... @OneToMany(mappedBy="item") protected Set<Bid> bids; ... } @Entity public class Bid { @Id protected Long bidId; protected Double amount; protected Date timestamp; ... @ManyToOne protected Item item; ... }

Note The concept of a business facade follows the well-known session facade design pattern. For an

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