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You can set up a connection architecture where the Oracle server starts a separate server process for each client connection, or you can enable several clients to share a single server process. The separate server processes use dedicated connections between each client and the Oracle server, and it is therefore named the dedicated server architecture. The shared server architecture is the term for connections where several user processes use the same Oracle server connection to perform their work.

To test the Order Entry system, create a simple test fixture consisting of a main form that hosts WorkerOrderEntry. The test fixture tests WorkerOrderEntry and CoordinatorOrderEntry together, but in a standalone configuration without the server components. The text fixture s main form class provides handlers for all the Coordinator events, simulating the presence of the Router. The test fixture s main form is very similar to the Order Entry main form, except for the extra handler methods.

The shared server architecture relies on a dispatcher service to process connection requests from clients. A single dispatcher can service many client connections simultaneously. Dispatchers essentially act as mediators between the clients and the shared servers. Dispatchers are in charge of receiving requests from clients and placing them in a request queue, from which the shared server picks them up. When you use a dispatcher (that is, when you use the shared server approach), the listener will not hand off a connection request to the database server directly; it hands the request off to the dispatcher. This is referred to as a direct hand-off to the dispatcher. The listener can also redirect a client connection to a dispatcher. In this case, the listener will pass the dispatcher s network address to the client connection, and this information enables the client to connect to the dispatcher, whereupon the listener connection is terminated. You can use the Oracle Connection Manager to configure session multiplexing, which involves pooling multiple client sessions through a network connection to a shared server destination.

Dedicated server processes do not involve any sharing of resources by clients. Each client is assigned a dedicated server connection. The Oracle listener will start up a dedicated server process whenever a client process requests a connection. The listener passes the dedicated server s protocol address back to the client; the client then uses that to connect directly to the database server. The listener connection is terminated as soon as it passes the dedicated server s address to the client. This chapter deals exclusively with the more commonly used dedicated server architecture. To learn how to set up a shared server configuration, please refer to Oracle s manual for networking, the Net Services Administrator s Guide.

When you want to open a database session from a client, whether it s a traditional client or a browserbased client, you need to connect to the database across a network Suppose you re establishing a connection over an existing network from your desktop to an Oracle database on a UNIX server across town You need a method of making a connection between your desktop and the Oracle database (which involves the use of specialized software), you need some kind of interface to conduct the session (which, in this example, will be SQL*Plus), and you need some way of communicating with the industry-standard network protocols, such as TCP/IP To make it easier for you to configure and manage network connections, Oracle provides Oracle Net Services, which is a suite of components that provide connectivity solutions in distributed, heterogeneous computing environments.

Implementation Note The test fixture resides in a separate directory from Order Entry and uses file links to reference the WorkerOrderEntry and CoordinatorOrderEntry classes. A file link is a Microsoft Visual Studio .NET way of including in one project a class contained in a different directory. With Visual Studio .NET, you create file links when adding a file to a project. On the Add Existing Item dialog box, select a file, then click the dropdown arrow on the Open button and select the Link File option from the list.