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Performance Logs and Alerts expands the monitoring capabilities of System Monitor to include features for logging counter and trace data and for generating performance alerts. Logged counter data information can be exported to spreadsheets or databases for analysis and report generation. The data can be stored as a text file (comma- or tab-delimited), a binary file, a binary circular file where the log file is a set size and new data overwrites old data, or a SQL database. Performance logging runs as a service. As a result, a user doesn t have to be logged on to the monitored computer for data collection to occur. You can manage multiple logging sessions from a single console window and view data as it is collected as well as after collection has stopped. Automatic log generation enables the defining of parameters such as filename, file size, and start and stop times. An alert can be set on a counter to cause a specific action to occur, such as starting a specified program, sending a notification message, or starting a log when the value of a selected counter falls below or exceeds a specified setting.

Introducing Windows Workflow Foundation (WF)

A counter log collects data at a predefined interval. Counter logs are helpful for recording data about system services activities and hardware usage from the local machine or a remote machine. You can log data manually on demand or schedule logging to start and stop automatically. The system can also perform continuous logging, depending on the file size and duration limits you set. The logged data can be viewed through the System Monitor display or exported to spreadsheets or databases. You can view the counters configured in the counter log dynamically through System Monitor by saving log settings such as counters as an HTML page. The resulting page hosts the System Monitor control through an ActiveX control that provides the interface for the monitoring user.

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If you compiled the solution, which you can do by selecting Build Solution from the Visual Studio Build menu, everything builds without error. But the WorkflowHost application still hangs as it did in the previous chapter. Why It hangs because although we did just create a workflow assembly we can use, we didn t ask the main application to execute it. The WorkflowCompleted event will never fire, so the automatic reset event won t release the main application thread. To execute our workflow task, we ll need to reference the new workflow assembly we created and add the code that the WorkflowRuntime object will need to kick off the workflow job. Let s work through that now. Host a custom workflow assembly, and start a workflow instance without parameters 1. First we ll add a reference to our LongRunningWorkflow assembly that supports our simulated long-running workflow task. We ll start by adding the reference as we have in the past, but instead of selecting an assembly under the .NET tab, we ll use the Projects tab. There is no need to add a using directive for this assembly. Tip

Rather than measure samples at a predefined interval, as counter logs do, a trace log monitors data continuously and waits for specific events such as page faults to occur. That data is then recorded into a binary trace log file. Developers can use the tools in the Microsoft Platform SDK to translate binary trace logs into human-readable form.

You are the security services manager for Tailspin Toys. Your organization implements a two-tier CA hierarchy, as shown in Figure 10-1.

If you prefer, you can add a project-level reference to the LongRunningWorkflow project using the Add Reference dialog box s Browse tab. Using the file system navigation controls, browse to \Workflow\3\LongRunningWorkflow\bin\Debug and select LongRunningWorkflow.dll. Then click OK.

To create a counter log or a trace log, complete the following steps: 1. Launch Performance from the Administrative Tools menu, and in the console tree, expand Performance Logs And Alerts. 2. In the console tree, select Counter Logs to create a counter log, or select Trace Logs to create a trace log. Existing logs are listed in the details pane. A red icon indicates a log that is not running or has been stopped; a green icon indicates a log that is running. 3. Right-click in a blank area of the details pane and choose New Log Settings (Figure 20-8).

Figure 20-8.