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When creating your SQL Server installation, you can define how much of the server s physical memory you wish to allocate to SQL Server. It is possible to set minimum and, more important, maximum memory allocation amounts, thereby allowing more than one SQL Server instance on a physical server, for example. When CLR objects require memory, the space is requested from the SQL Server operating system (SQLOS) virtualization layer rather than directly from the operating system. This means that a CLR process s memory utilization cannot exceed the configured maximum for the SQL Server service. It is important to remember that SQL Server hosts and controls the CLR process, not the other way around. Once memory has been granted by SQLOS, the hosted CLR runtime manages object allocation and deallocation within that memory space. It does this by managing the lifetime of any objects created within your code and performing garbage collection sweeps to periodically check the memory heap for any object that is no longer referenced. Any object dereferenced within your code will cause the deallocation of any memory set aside for that object. This means that the problems associated with working with unmanaged code (whereby an application reserves a pool of memory for objects and then does not release it properly) should be moot, providing you are not accessing resources that are not managed by the CLR. Of course, this is no excuse for bad programming, and it is still highly advisable to do as your mother has always told you and Clean up after yourself. Also, by implementing the IDisposable interface within your assembly, you can use the Dispose function to explicitly remove any unmanaged resources.

Figure 12 5. QuickReturnTraderChat application The class implementing the Windows form is called Main and is implemented as shown in Listing 12 4. This form inherits from the .NET Form class and also implements the IQuickReturnTraderChat interface that was defined earlier. Since this is a WCF service, the class is decorated with the ServiceBehavior attribute and the InstanceContextMode, which controls when a new service object should be created. In our case, we want this to behave as a singleton; as a result, the InstanceContextMode is set to Single. Listing 12 4. Service Host Class Definition [ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] public partial class Main : Form, IQuickReturnTraderChat { }

Finally, we release rowAsNum to be a good memory citizen and return the cell:

[rowAsNum release]; return cell; }

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As shown in Listing 12 5, the Main class implements two methods, StartService and StopService, which start and stop the service host, respectively. The Main class also has a few member variables, which expose the Channel, ServiceHost, and ChannelFactory. Listing 12 5. Service Host Implementation IQuickReturnTraderChat channel; ServiceHost host = null; ChannelFactory<IQuickReturnTraderChat> channelFactory = null; string userID = string.Empty(); private void StartService() { // Instantiate new ServiceHost host = new ServiceHost(this); //Open ServiceHost host.Open(); // Create a ChannelFactory and load the configuration setting channelFactory = new ChannelFactory<IQuickReturnTraderChat> ("QuickTraderChatEndpoint"); channel = channelFactory.CreateChannel(); // Lets others know that someone new has joined channel.Say("Admin", "*** New User " + userID + " Joined ****" + Environment.NewLine); } private void StopService() { if (host != null) { channel.Say("Admin", "*** User " + userID + " Leaving ****" + Environment.NewLine); if (host.State != CommunicationState.Closed) { channelFactory.Close(); host.Close(); } } }

We do implement one table delegate method this time, which is tableView: willSelectRowAtIndexPath:. Remember, this method gets called before a row gets selected and gives us a chance to disallow the row selection. In this view, we never want a row to appear selected. We need to know that the user selected a row so we can place a checkmark next to it, but we don t want the row to actually be highlighted. Don t worry. A row doesn t need to be selected for a text field on that row to be editable, so this method just keeps the row from staying highlighted after it is touched.

Another feature provided by the CLR to ensure code stability is the idea of application domains (AppDomains). A single CLR process can host many AppDomains, which can be thought of as virtual process spaces. Each AppDomain is completely isolated within the process space, which is referred to as sandboxing. By hosting applications in this way, the CLR can run many applications simultaneously in a single process, without allowing a single misbehaving application to destroy the entire process space. Should an application become deadlocked, leak memory, or otherwise enter an unstable state, its AppDomain can be reset by the CLR without affecting the other AppDomains loaded in the process. AppDomains are especially important in the SQL Server hosted CLR environment. Assemblies loaded into databases, like other database objects, are owned by a database user. All assemblies owned by the same user in the same database will run within the same AppDomain. Assemblies owned by a different user will run within a separate AppDomain. This means that the SQL Server process can reset any misbehaving AppDomain without affecting other users

- (NSIndexPath *)tableView:(UITableView *)tableView willSelectRowAtIndexPath:(NSIndexPath *)indexPath { return nil; }

IQuickReturnTraderChat Implementation (Receiver)

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