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Note If you cannot start Certificate Services after reinstalling it with the same certificate and key pair, try reinstalling without enabling the option to preserve the existing certificate database. The problem could be a corrupt CA database or log file. Once you reinstall, you can restore a working version of the CA database and log files from a System State or manual backup.

You can right-click either of the thresholds in the details pane and select Properties to make changes. Add a threshold by right-clicking the data collector in the console tree, selecting New, and then clicking Threshold.

A type of workflow we ve not seen so far in this book is one based on the model of a deterministic state machine Crusty old digital microelectronics engineers (and I sadly admit I am one) well understand the design and implementation of state machines However, if you re not a crusty old digital microelectronics engineer, the concept might be new to you 14 is entirely dedicated to working with state-based workflows, but I ll introduce the concept here We ll build a quick little state-based workflow as well People have dedicated their entire lives to the study of finite state machines There is a language specific to finite state machines, custom mathematical notation, and a specific way they re diagrammed.

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Process Monitor On the Details tab of a Process Monitor data collector, you can specify the process to monitor. Use Process Monitor to monitor applications and processes that are not Windows services. You can monitor only one process at a time.

I can t possibly hope to provide you with everything you might need to build statebased workflows, but I can provide enough information so that you can make sense of them as we build one or two Tip There are many resources on the Internet that better and more deeply describe finite state machines One that s worth looking into is enwikipediaorg/wiki/Finite_state_machine Breaking the term down, we have three words: finite, state, and machine Finite, in this case, means we have a limited number of states we re willing to transition to States are logical conditions our application transitions to as events occur And machine implies automation Let me illustrate by using an example In engineering school, you might be asked to design any number of digital systems using a finite state machine The two classic examples are the vending machine and the washing machine.

By default, a single threshold is set:

Part II:

Looking at the vending machine, think about the steps the machine has to take to provide you with its product (soda, candy, snacks whatever it s designed to dispense) As you insert coins, it counts the money until you ve provided at least enough to pay for your selection As you make your selection, it checks inventory (if it didn t already indicate it was out of a specific choice) If there is inventory, it dispenses your selection And if you provided too much money, it makes change and dispenses that as well We can model the vending machine using a finite state machine To diagram a finite state machine, we use circles as states and arrows as transitions between states The transitions are triggered by events There is a logical starting point and one or more logical stopping points.

Change the state to Critical if error code is not equal to zero. A nonzero return points toward a data collection error. You can right-click the threshold in the details pane and select Properties to make changes. Add a threshold by right-clicking the data collector in the console tree, selecting New, and then clicking Threshold.

Windows Event Log Monitor On the Details tab of a Windows Event Log Monitor data collector, you can specify the Windows events to monitor.

If we stop somewhere in between, our application is said to be in an indeterminate or invalid state Our job is to prevent invalid states We can t give our product away for free, and we shouldn t ask for more money than the product is worth, or worse, eat the user s money Users have been known to get violently angry at vending machines that take their money but don t provide the goods..