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Some controls reject users keystrokes as they are entered. When a control actively rejects keystrokes during the entry process, this is an example of active validation. A text-only entry control, for example, may accept only alphabetic characters and refuse to allow numbers to be entered. Some controls reject any keystrokes other than the numeric digits 0 through 9. Other controls reject spaces, tabs, dashes, and other punctuation in real time. Some variants can get pretty intelligent and reject some numbers based on live calculations, for example, unless they pass a checksum algorithm. When an active validation control rejects a keystroke, it must make it clear to the user that it has done so. It should also alert the user as to why it made the rejection. If an explanation is offered, users will be less inclined to assume the rejection is arbitrary (or the product of a defective keyboard). They will also be in a better position to give the application what it wants. Sometimes the range of possible data is such that the program cannot validate it until the user has completed his entry (rather than at each individual keystroke). The validation then takes place only when the control loses focus, that is, when a user is done with the field and moves on to the next one. The validation step must also take place if a user closes the dialog or invokes another function if the

Issuing the admin save command would make it disappear (until the next configuration change)..

the specified action to drop or forward. If a packet does not match the entry parameters, the packet continues through the filter process. If the packet does not match any of the entries, the system executes the specified default action (i.e., drop the packet unless a different default action is configured ). This process is illustrated in Figure 6.14. It is important to keep in mind that a single filter can have many entries, each with its own criteria to match. A packet will be examined against each entry, so the more entries that exist, the more processing that is required.

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control is not in a dialog box (for example, clicks Place Order on a Web page). If the control waits until a user finishes entering data before it edits the value, this is passive validation. The control may wait until an address is fully entered, for instance, before it interrogates a database to see if it is recognizable as a valid address. Each character is valid by itself, yet the whole may not pass muster. The program could attempt to verify the address as each character is entered but could introduce some undesirable latency with the extra workload. Besides, while the program would know at any given instant whether the address was valid, the user could still move on while the name was in an invalid state. A way to address this is by maintaining a countdown timer in parallel with the input and reset it on each keystroke. If the countdown timer ever hits zero, do your validation processing. The timer should be set to something around half a second. The effect of this is that as long as a user is entering a keystroke faster than once every half a second, the system is extremely responsive. If the user pauses for more than half a second, the program reasonably assumes that he has paused to think (something that takes months in CPU terms) and goes ahead and performs its analysis of the input so far. To provide rich visual feedback, the entry field could change colors to reflect its estimate of the validity of the entered data. The field could show in shades of pink until the program judged the data valid, when it would change to white or green.

Figure 6.14 Incoming packets are compared against each filter entry in the filter policy. If there is a match, then the filter entry action is applied. If the entry is not a match, then each successive entry is checked until a match is found or the router reaches the end of the entries. If the end of the list is reached without a match, the default action is taken, or, if no default action is specified, the packet is dropped.

taskDecls.add(1DConstants.T-SAMPLEANDTHRESHOLD, new TaskDeclaration(IDConstants.T-SAMPLEANDTHRESHOLD, new SampleAndThreshold(m-datapool, m-config, m-networkArchitecture, m-GUI), Thread.MAX-PRIORITY-0, "NODESUPERUINSTANCE", false, 1 , PERIODIC",,l,,true));

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