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As part of this process, you may encounter a situation in which you are using thirdparty components that you don t have the source code for You ll have to make sure that these components are installed, configured, and referenced correctly in your runtime code Each component has its own nuances, so it s best to work with its documentation at this stage For example, if you are using a charting component that uses a SQL Server database for caching, you ll have to install it on your server, configure it for database access, and then reference it in your application This type of process is usually well documented in the third-party component s deployment instructions Finally, you configure IIS if necessary You may need to look into advanced IIS topics that are beyond the scope of this book, such as application pooling, which helps you to isolate ASP .

public UnavailableException(String text)

When the Client calls the commands, the object name is required, as in:

NET applications from each other and increase their overall reliability Configuring the server and deploying an application to it is best illustrated by example, so as you proceed through this chapter, you ll take a look at what is involved in deploying the multitier application that provided the addresses from the AdventureWorks database to the browser that you built in 5 You didn t make any changes to the database structure or contents, so you don t need to deploy any new database information But if you had, you would of course have to make sure that the database on the server matches the one in your development environment..

For example:

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throw new UnavailableException("The database has been decommissioned");

One really nice feature of IIS is the facility to provide and use application pools. An application pool can contain a number of applications, and it allows you to configure levels of isolation between different web applications. For example, if you want to isolate each ASP.NET application on your web server from every other one, you could create a separate application pool for each one, and then place your applications in them. As each application pool runs in its own worker process, an error in one application will not affect others.

Alternatively, you can specify a minimum period of time (in seconds) during which no attempt must be made to restart the portlet:

Paste paste = new Paste(document); Print print = new Print(document); clipboard = "Hello, everyone"; paste.Execute( ); print.Execute( ); paste.Undo( );

Remember, your web service is connected to your database, so the first step is to change the web service connection from pointing to your local database to pointing to the server-based one. You do this by changing the connection string. Earlier, you had a connection string that looked like this:

public UnavailableException(String text, int seconds)

The rest of the program including the Receiver that handles the Document mirrors the simple Command pattern example. Because command objects are separate from Clients and Receivers, they can undertake system functions such as logging. A simple logging operation is to count how many times commands are called a function of the Invoker type. To implement the logging, we define an extension method on the Invoker delegate type to provide: A Log method that increments a count A Count method that returns the current count value This InvokerExtensions class is shown at the start of the program in Example 8-5.

For example:

You should change it to look like this:

throw new UnavailableException("The database is not currently available",5);

Recall that extension methods: Must be static Must be in static classes at the outer level Can only have static fields Can be applied to delegates Details are in 2.

You may face some issues when trying to connect to this remote database. The most common ones will be that SQL Server isn t configured for remote access and that the server firewall isn t permitting the SQL Server traffic to pass. You ll see how to resolve these issues in the next sections.

If the duration of the resource unavailability cannot be determined but is still considered to be a temporary problem, the portlet should return a zero or negative time.

At the end of the program, we can call the Count method to print out the number of calls, as in:

For example:

SQL Server is configured using SQL Server Configuration Manager. From here, you can control the services, the native client, and the network configuration. On the network configuration screen (see Figure 6-12), you should make sure that the TCP service is enabled and running.

throw new UnavailableException("A website resource could not be reached",0);

Console.WriteLine("Logged "+paste.Execute.Count( )+" commands");