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Private assemblies are very useful, but sometimes you will want to put a DLL in a central place so that a single copy can be shared by other assemblies on the system. .NET has such a repository, called the global assembly cache (GAC). An assembly placed into the GAC is called a shared assembly. Some important facts about the GAC are the following: Only strongly named assemblies can be added to the GAC. Although earlier versions of the GAC accepted only files with the .dll extension, you can now add assemblies with the .exe extension as well. The GAC is located in a subdirectory named Assembly, of the Windows system directory.

Last, because the ESL cannot communicate directly with the ASL, you must create a DSL service to route the service request to the appropriate application service We deliberately left the Order domain in Figure 10-10 to show that even though the applications in the Order domain need to use the credit card service, the Order domain is merely a consumer of the credit card service, and therefore isn t a part of the service map..

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When you attempt to install an assembly into the GAC, the security components of the CLR must first verify that the digital signature on the assembly is valid. If there is no digital signature, or if it is invalid, the system will not install it into the GAC. This is a one-time check, however. After an assembly is in the GAC, no further checks are required when it is referenced by a running program. The gacutil.exe command-line utility allows you to add and delete assemblies from the GAC, and list the assemblies it contains. The three most useful flags are the following: /i: Inserts an assembly into the GAC /u: Uninstalls an assembly from the GAC /l: Lists the assemblies in the GAC

Let s update the title of the book whose ISBN is 1932394419. Here s the JDBC code:

As you can see, the methodology is simple. To help ensure that you understand the process, let s try a test. We ll describe the scenario, and you use the methodology to create a service map on a piece of scrap paper. Also, make a note of whether you re using a top-down or bottom-up approach, based on the scenario description. Scenario: Our suppliers need to interrogate our systems and check our current inventory levels. Based on our inventory levels, they will ship additional products to us. We need a way to allow our suppliers to see our current inventory levels. However, each of our suppliers has a proprietary format for the inventory data they ll receive from us, so we need to adapt our inventory information into their data format. See Figure 10-11 to see the service map and the approach used. Despite the fact that the scenario sounds so complex, the service map is pretty straightforward. In the Supply domain, you ll create your supplier-specific adapters (each supplier expects its own data format to be returned to it). Whether you create an application for each adapter or have a single application that s used by each supplier-specific adapter is a design choice you need to make. However, from the point of view of the service map, it s not important. The direct result of this is that we have an application in the Supply domain/ASL. Next, you know that the application in the Supply domain needs information from the Inventory domain. Because you re crossing domain boundaries, you must have an enterpriselevel service. To get to the application service that holds the inventory information, the ESL must make a call through the DSL, so you create a service in the Inventory domain s DSL also.

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