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As with Java, data is read from and written to files through use of a streams model. (See the "Streams" section later in this chapter for more details.) This section demonstrates how to get streams to access files. .NET provides several means to get a stream, but all result in the creation of a System.IO.FileStream instance. The FileStream class is the default stream for operations that are backed by a file. In .NET, streams can typically read and write data, so this class is roughly equivalent to a combination of java.io.FileOutputStream and java.io.FileInputStream.

The Action tab specifies what happens once an alert is triggered. A multitude of options let you know that your counter s criteria have been met. The various options are as follows:

All of these mechanisms are transparent to your application code . To you, the developer, it appears as if there is just one managed heap; these mechanisms exist simply to improve application performance .

Log An Entry In The Application Event Log Selecting this option puts an event in the event log, which you can see using Event Viewer. A notice of the counter, value, and limit are part of the log entry, as shown in Figure 12-9.

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The most direct way to create a stream is to create a new instance of FileStream, passing in a path string to the constructor. Because .NET streams can be used to read and write data, details must be supplied about how the file is opened. The basic FileStream constructor takes the following form:

Figure 12-9

Automatic Memory Management (Garbage Collection)

Send A Network Message To Selecting this option sends the equivalent of a Net Send command with the alert s message. You need to specify the name of a computer here, not a user. For messages to be sent out, the Alerter service must be started on the machine from which you are doing the monitoring. For messages to be received, the Messenger service must be started on the receiving computer. Neither of these services runs on a newly installed Windows Server 2003 server; you must manually change the state from Disabled to Automatic and ensure that the services are running. Start Performance Data Log You can configure the alert system to start by writing additional counters to a log file to be reviewed later. You need to preset the log file by using the Counter Logs node within the Performance Logs And Alerts node, as seen earlier in Figure 12-6.

Monitoring Network Performance 12-13

FileStream(string path, FileMode mode, FileAccesss access);

Within a process, there are a few methods that you can call to monitor the garbage collector . Specifically, the GC class offers the following static methods, which you can call to see how many collections have occurred of a specific generation or how much memory is currently being used by objects in the managed heap:

Run This Program Once your trigger has gone off, you can execute an external program. You might have an external paging network or some other external alert system to help you find out when triggers go off. Or, in the most extreme case, you might choose to shut down the system when an alert is triggered. You would perform this task by running the built-in Shutdown.exe command found in Windows Server 2003.

Int64 GetTotalMemory(Boolean forceFullCollection); Int32 CollectionCount(Int32 generation);

Finally, you can configure the settings on the Schedule tab, which help you determine when to trigger. For instance, you might not want to get alerts at off-peak times or on weekends. Or maybe you do! It s your choice. If you do not choose to run the alert within a schedule through the Schedule tab, you must manually start your alert. To do so, right-click the alert you just created and select Start, as shown in Figure 12-10.

The FileMode enumeration argument indicates how the file should be opened. Table 10-4 describes the different FileMode enumeration members.