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It is important that companies carefully guard the private key of their official public/private key pair. Otherwise, if untrustworthy people were to obtain it, they could publish code masquerading as the company s code. To avoid this, companies clearly cannot allow free access to the file containing their public/private key pair. In large companies, the final strong naming of an assembly is often performed at the very end of the development process, by a special group with access to the key pair. This can cause problems, though, in the development and testing processes, for several reasons. First, since the public key is one of the four components of an assembly s identity, it can t be set until the public key is supplied. Also, a weakly named assembly cannot be deployed to the GAC. Both the developers and testers need to be able to compile and test the code in the way it will be deployed on release, including its identity and location in the GAC. To allow for this, there is a modified form of assigning a strong name, called delayed signing, or partial signing, that overcomes these problems, but without releasing access to the private key. In delayed signing, the compiler uses only the public key of the public/private key pair. The public key can then be placed in the manifest to complete the assembly s identity. Delayed signing also uses a block of 0s to reserve space for the digital signature. To create a delay-signed assembly, you must do two things. First, create a copy of the key file that has only the public key, rather than the public/private key pair. Next, add an additional attribute called DelaySignAttribute to the assembly scope of the source code and set its value to true.

Generics in C#

So far, we ve drawn service maps for individual services. Let s create a single service map that contains all the mapping information we ve created so far. Figure 10-13 shows the map of all our services so far. As you can see, it s already cluttered. Imagine the service map for a real enterprise with hundreds of services; the map would be unintelligible due to the amount of data on it. It might be visually impressive, but other than that, it would be completely useless.

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With C# 2.0, Microsoft introduced the generics features, which offer more elegant ways of using a set of code with more than one type. Generics allow you to declare type-parameterized code, which you can instantiate with different types. What this means is that you can write the code with placeholders for types, and then supply the actual types when you create an instance of the class. By this point in the text, you should be very familiar with the concept that a type is not an object, but a template for an object. In the same way, a generic type is not a type, but a template for a type. Figure 19-1 illustrates this point.

<hibernate-mapping package="com.hibernaterecipes.chapter5"> <class name="Customer5_1" table="CUSTOMER" schema="BOOK5"> <id name="id" type="long" column="ID"> <generator class="native"></generator> </id> <property name="firstName" type="string" column="FIRST_NAME" /> <property name="lastName" type="string" column="LAST_NAME" /> <property name="idCardNo" type="string" column="ID_CARD_NO" /> <property name="countryCode" type="string" column="COUNTRY_CODE" /> <property name="email" type="string" column="EMAIL" /> <one-to-one name="address" class="com.hibernaterecipes.chapter5.Address5_1" cascade="save-update"></one-to-one> </class> </hibernate-mapping> By itself, this mapping establishes a unidirectional one-to-one mapping, provided the Address class is mapped as a separate entity. To achieve the sharing of the primary key, you need to map the Address class as shown here: <hibernate-mapping package="com.hibernaterecipes.chapter5"> <class name="Address5_1" table="ADDRESS" schema="BOOK5"> <id name="id" type="long" column="ID" > <generator class="foreign"> <param name="property">customer</param> </generator> </id> <property name="city" type="string" column="CITY" /> <property name="street" type="string" column="STREET" /> <property name="doorplate" type="string" column="DOOR_PLATE" /> <one-to-one name="customer" class="Customer5_1" constrained="true"></one-toone> </class> </hibernate-mapping> In the Address mapping file, you establish bidirectionality with the one-to-one element. Also note that you make constrained true, which adds a foreign key constraint. The constraint links the primary key of the ADDRESS table to the primary key of the CUSTOMER table. The generator of the primary key of the Address class is set to foreign with a property mapping to the Customer instance; this causes the primary key to be shared between the Customer and Address classes. In addition, you can t delete the Customer class without also deleting the Address class. The JPA specification doesn t have a way to deal with a shared primary key. It has serious issues with establishing bidirectionality and a foreign key. In JPA annotations, the Customer class s Address property must be mapped with the annotations OneToOne and PrimaryKeyJoinColumn: @Entity @Table (name="CUSTOMER",schema="BOOK5") public class Customer5_1 implements Serializable { private static final long serialVersionUID = -3534434932962734600L; @Column (name="ID")

I Do not store service maps that show multiple services. In practice, we find the ESM so straightTip

Figure 19-1. Generic types are templates for types. C# provides five kinds of generics: classes, structs, interfaces, delegates, and methods. Notice that the first four are types, and methods are members. Figure 19-2 shows how generic types fit in with the other types covered.

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