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Figure 13-4. The result after loading, adding, and removing objects Suppose ApplyEdit() is now called on the collection. This applies all edits made at edit level 2, putting the collection back to edit level 1. Since child C was added at edit level 2, it simply goes away, but child B sticks around because it was added at edit level 1, which is illustrated in Figure 13-5. Both objects remain marked for deletion because the changes made at edit level 2 were applied. Were CancelEdit() called now, the collection would return to the same state as when the first BeginEdit() was called, meaning that only child A (not marked for deletion) would be left.

The first thing you do to update the configuration for a running role is get an instance of the DeploymentDiagnosticManager for the deployment One object oversees all the roles in your deployment Give it a connection string to your storage account for logging This constructor doesn t take a configuration element like the DiagnosticsMonitor class does You have to pass in a real connection string, or a real connection The code in listing 182 grabs the string out of the role configuration with a call to GetConfigurationSettingValue From there, you ask for a collection of RoleInstanceDiagnosticManager objects for the particular role you want to work with In this example, we re changing the configuration for the NinjaWebSite role You ll get one RoleInstanceDiagnosticManager object for each instance that s running the NinjaWebSite role.

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Better team-development experience Higher clarity in coding On the other hand, a properly chosen physical n-tier architecture can provide the following benefits: Performance Scalability Fault tolerance Security It goes almost without saying that if the physical or logical architecture of an application is designed poorly, there will be a risk of damaging the things that would have been improved had the job been done well.

Next, you create the new part of the configuration you want to add to the agent q In this example, you ll build another performance counter data source that will track the percentage of CPU in use Then you ll iterate over your collection w and add the new performance counter CPUTime to the current configuration e This process is different from that used when you re changing the configuration in a role Here you want to add to the configuration, not completely replace it Finally, you update the configuration for that instance, which updates the configuration file for the diagnostic agent When the agent polls for a configuration change, it ll pick up the changes and recycle to load them Figure 186 shows the results of the configuration changes that you ve made.

Figure 13-5. Result after calling ApplyEdit Alternatively, a call to ApplyEdit() would commit all changes made at edit level 1: child A would continue to be marked for deletion, and child B would be totally discarded because it was added and deleted at edit level 1. Both of these possible outcomes are illustrated in Figure 13-6.

Experienced designers and developers often view a good n-tier architecture as a way of simplifying an application and reducing complexity, but this isn t necessarily the case It s important to recognize that n-tier designs (logical and/or physical) are typically more complex than single-tier designs Even novice developers can visualize the design of a form or a page that retrieves data from a file and displays it to the user, but novice developers often struggle with 2-tier designs, and are hopelessly lost in an n-tier environment With sufficient experience, architects and developers do typically find that the organization and structure of an n-tier model reduces complexity for large applications However, even a veteran n-tier developer will often find it easier to avoid n-tier models when creating a simple form to display some simple data.

In this sample, we ve put this code in the role, but this code would work running from any application that s running outside Azure as well The only difference would be how you provide the connection string to storage, and how you provide the deployment ID We ve looked at the standard data sources for Windows Azure diagnostics, but there s one hole remaining What if you want to manage a diagnostic source that isn t on the official list This situation is where the escape hatch called arbitrary diagnostics sources comes into play..

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