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Figure 4-7. The Enable Selection option turned on 3. If Enable Selection isn t activated, click it to activate the feature. If it is activated, click the worksheet, to close the menu without making a selection. 4. To select subtotals for a Row Labels field, point to the left edge of a cell that contains a subtotal label, and when the pointer changes to a black arrow shape (see Figure 4-8), click to select all the subtotals for that field.

Figure 7-23. Showing the interface on incoming signals on ReportFormatter By changing the value or the single interface reference ReportPrinter.formatter, all the signals emerging from W1 can be changed to go to a different object. I ll describe signal switching in more detail in the later section, Switching at the Interface Level. With SR signals, output pins don t invoke methods, but instead write messages to a shared resource. The pin is named after the variable holding a reference to the shared resource. The variable may be an IP address, a telephone number, a shared memory pointer, a filename, or other. For example, if an object sent messages to a shared resource referenced by the variable named OutputMessages, the output pin could be named OutputMessages, as shown in Figure 7-24.

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Performance and scalability are affected adversely if an application has to authenticate using the end user s database password. Consider an application that uses a connection pool of a maximum 100 connections for a system serving 5,000 end users. Every time a new user logs in, the likelihood of the user s connection not existing in the pool is high, simply because each user connects to a different account. This means that, more likely than not, an existing connection in the pool has to be closed and replaced with a newly created connection. This defeats the purpose of connection pooling to a large extent, especially when you use an implicit connection cache, where each session requires the creation of a physical connection. Some of the problems just mentioned would be mitigated if all application end users shared a smaller set of database user accounts based on their roles (i.e., an N-to-M mapping). However, this gives rise to new set of problems. One problem is that different application users have to share the same password for the shared database account, leading to poor security. Another problem, as mentioned earlier, is that the user actions cannot be audited effectively. What we really need is for the application to log into the database using a common database account on behalf of an end user without requiring it to present the end user s database password. In other words, the account midtier proxies for the end user. This is where proxy authentication (also known as n-tier authentication) comes in.

Proxy Authentication (N-Tier Authentication)

The Parts Scheduler runs a background thread, keeping an eye on the parts list, to detect when a WorkOrder is ready for assembly. When it finds a WorkOrder that is ready, it is written to the AsapVehiclesToAssembly queue, where it will subsequently be picked up by the next workflow process, which is the VehicleAssembly component. Figure 13-16 shows the UI of the Parts Scheduling component.

Figure 4-8. The black arrow pointer at the left of the subtotal in Row 8 5. If the subtotals are for a Column Labels field, point to the top edge of a cell that contains a subtotal label, and when the pointer changes to a black arrow shape, click to select all the subtotals for that field. 6. Format the selected subtotals, using the commands on the Ribbon s Home tab.

Proxy authentication is a feature available only in the JDBC OCI driver as of Oracle 10g Release 1.

Figure 13-16. The UI of the Parts Scheduling component Figure 13-17 shows the wiring diagram for the Parts Scheduling system.

Note In 10g Release 2, this feature is planned to be supported in the JDBC thin driver, too. The examples

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