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Figure 7-32. Calling into an object using a class interface Even if the renderingEngine link could be switched at run time to reference a different GraphicsDrawing object, the methods called though the interface are nonetheless considered statically bound: You can t change them at run time. Listing 7-2 shows how you might implement the GraphicsSurface class in C#. Listing 7-2. A C# Class Calling Statically Bound Methods Through an Interface using System; using OoGraphics3D; namespace GraphicsRendering { public class GraphicsSurface { GraphicsDrawing renderingEngine = new GraphicsDrawing(); public void AddTexture() { renderingEngine.Initialize(); renderingEngine.RenderTexture(); renderingEngine.ShutDown(); } } } GraphicsSurface invokes the OoGraphics3D methods through the GraphicsDrawing class. The fact that the calls go through an outgoing interface is sometimes significant and may need to be shown on wiring diagrams. Figure 7-33 shows statically bound signals associated with an outgoing interface.

You can use one or more of the following encryption-related parameters to specify whether data must be encrypted before it s written to a dump set: ENCRYPTION, ENCRYPTION_ALGORITHM, ENCRYPTION_ MODE, and ENCRYPTION_PASSWORD. Let s take a closer look at each of these parameters.

Use the ENCRYPTION parameter to specify whether or not to encrypt data before it s written to a dump file. You can assign the following values to the ENCRYPTION parameter: ALL: Encrypts all data and metadata DATA_ONLY: Encrypts only data written to the dump file set ENCRYPTED_COLUMNS_ONLY: Specifies encryption for only encrypted columns using the TDE feature METADATA_ONLY: Specifies the encryption of just the metadata NONE: Specifies that no data will be encrypted

Note You can enforce encryption by specifying either the ENCRYPTION or the ENCRYPTION_PASSWORD parameter or both. If you specify the ENCRYPTION_PASSWORD parameter only, the ENCRYPTION parameter will default to the value of ALL.

The outgoing pins for the statically bound signals are enclosed in a box labeled with the outgoing interface s name. You can include the interface s namespace where useful. The labeled box should be shown only when it is useful for readers to know that outgoing signals are called through an interface. To reinforce the presence of the interface, input pins receiving the signals can include the interface name. Going even further, you can enclose the input pins with a box denoting the input interface they belong to. Notice the absence of names for the output pins. Statically bound output pins have no name, since there is no variable associated with the pins. The signal names used on output pins are arbitrary, but commonly use the names of the interface methods being called.

If you don t specify the ENCRYPTION or the ENCRYPTION_PASSWORD parameter, the ENCRYPTION parameter defaults to NULL. If you omit the ENCRYPTION parameter but specify the ENCRYPTION_PASSWORD parameter, the ENCRYPTION parameter defaults to ALL. The following example shows how to specify just the data and nothing else: $ expdp hr DIRECTORY=dpump_dir1 DUMPFILE=hr.dmp JOB_NAME=test1 ENCRYPTION=data_only ENCRYPTION_PASSWORD=foobar

The ENCRYPTION_ALGORITHM parameter specifies the encryption algorithm to use in the encryption of data. The default value is AES128, and you can also specify AE192 and AES256. The following example shows how to specify this parameter: $ expdp hr DIRECTORY=dpump_dir1 DUMPFILE=hr.dmp ENCRYPTION_PASSWORD=foobar ENCRYPTION_ALGORITHM=AES128

The ENCRYPTION_MODE parameter specifies the type of security to be performed by the database when you choose to encrypt data during an export. The parameter can take three values: DUAL, PASSWORD, and TRANSPARENT. The default value for this parameter depends on whether you specify the other encryption-related parameters, as shown here: If you specify only the ENCRYPTION parameter, the default mode is TRANSPARENT. If you specify the ENCRYPTION_PASSWORD parameter and the Oracle Encryption Wallet is open, the default is DUAL. If you specify the ENCRYPTION_PASSWORD parameter and the Oracle Encryption Wallet is closed, the default is PASSWORD. DUAL mode enables you to create a dump set that you can import later using either the Oracle Encryption Wallet or the password you specified with the ENCRYPTION_PASSWORD parameter. You can use DUAL mode when you want to import the data into a site that doesn t use the Oracle Encryption Wallet.

Although the protagonists of wiring diagrams are objects and signals, sometimes it is useful to show which component an object is contained in or came from. The object is simply drawn inside a component symbol, as shown in Figure 7-34.