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Productivity applications such as word processors and spreadsheets also allow users to write macros in any programming language they choose . These macros will have access to all of the assemblies and types that work with the CLR . They will be compiled, so they will execute fast, and, most important, these macros will run in a secure AppDomain so that users don t get hit with any unwanted surprises . Your own applications can use this ability, too, in any way you want .
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22 CLR Hosting and AppDomains
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In this section, I ll mention some more advanced topics related to hosting the CLR . My intent is to give you a taste of what is possible, and this will help you to understand more of what the CLR is capable of . I encourage you to seek out other texts if you find this information particularly interesting .
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The System.AppDomainManager class allows a host to override CLR default behavior by using managed code instead of using unmanaged code . Of course, using managed code makes implementing a host easier . All you need to do is define your class and derive it from the System.AppDomainManager class, overriding any virtual methods where you want to take over control . Your class should then be built into its very own assembly and installed into the global assembly cache (GAC) because the assembly needs to be granted full-trust, and all assemblies in the GAC are always granted full-trust . Then, you need to tell the CLR to use your AppDomainManager-derived class . In code, the best way to do this is to create an AppDomainSetup object initializing its AppDomainManagerAssembly and AppDomainManagerType properties, both of which are of type String . Set the AppDomainManagerAssembly property to the string identifying the strong-name identity of the assembly that defines your AppDomainManagerderived class, and then set the AppDomainManagerType property to the full name of your AppDomainManager-derived class . Alternatively, AppDomainManager can be set in your application s XML configuration file by using the appDomainManagerAssembly and appDomainManagerType elements . In addition, a native host could query for the ICLRControl interface and call this interface s SetAppDomainManagerType function, passing in the identity of the GAC-installed assembly and the name of the AppDomainManager-derived class .5 Now, let s talk about what an AppDomainManager-derived class can do . The purpose of the AppDomainManager-derived class is to allow a host to maintain control even when an addin tries to create AppDomains of its own . When code in the process tries to create a new AppDomain, the AppDomainManager-derived object in that AppDomain can modify security and configuration settings . It can also decide to fail an AppDomain creation, or it can decide to return a reference to an existing AppDomain instead . When a new AppDomain is created, the CLR creates a new AppDomainManager-derived object in the AppDomain . This object can also modify configuration settings, how execution context is flowed between threads, and permissions granted to an assembly .
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It is also possible to configure an AppDomainManager by using environment variables and registry settings, but these mechanisms are more cumbersome than the methods mentioned in the text and should be avoided except for some testing scenarios .
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Writing a Robust Host Application
A host can tell the CLR what actions to take when a failure occurs in managed code . Here are some examples (listed from least severe to most severe):
The CLR can abort a thread if the thread is taking too long to execute and return a response . (I ll discuss this more in the next section .) The CLR can unload an AppDomain . This aborts all of the threads that are in the AppDomain and causes the problematic code to be unloaded . The CLR can be disabled . This stops any more managed code from executing in the process, but unmanaged code is still allowed to run . The CLR can exit the Windows process . This aborts all of the threads and unloads all of the AppDomains first so that cleanup operations occur, and then the process terminates .
The CLR can abort a thread or AppDomain gracefully or rudely . A graceful abort means that cleanup code executes . In other words, code in finally blocks runs, and objects have their Finalize methods executed . A rude abort means that cleanup code does not execute . In other words, code in finally blocks may not run, and objects may not have their Finalize methods executed . A graceful abort cannot abort a thread that is in a catch or finally block . However, a rude abort will abort a thread that is in a catch or finally block . Unfortunately, a thread that is in unmanaged code or in a constrained execution region (CER) cannot be aborted at all . A host can set what is called an escalation policy, which tells the CLR how to deal with managed code failures . For example, SQL Server tells the CLR what to do should an unhandled exception be thrown while the CLR is executing managed code . When a thread experiences an unhandled exception, the CLR first attempts to upgrade the exception to a graceful thread abort . If the thread does not abort in a specified time period, the CLR attempts to upgrade the graceful thread abort to a rude thread abort . What I just described is what usually happens . However, if the thread experiencing the unhandled exception is in a critical region, the policy is different . A thread that is in a critical region is a thread that has entered a thread synchronization lock that must be released by the same thread, for example, a thread that has called Monitor.Enter, Mutex s WaitOne, or one of ReaderWriterLock s AcquireReaderLock or AcquireWriterLock methods .6 Successfully waiting for an AutoResetEvent, ManualResetEvent, or Semaphore doesn t cause the thread to be in a critical region because another thread can signal these synchronization objects . When a thread is in a critical region, the CLR believes that the thread is
All of these locks internally call Thread s BeginCriticalRegion and EndCriticalRegion methods to indicate when they enter and leave critical regions . Your code can call these methods too if you need to . Normally, this would be necessary only if you are interoperating with unmanaged code .
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