Application Domains As Logical Units of Execution in VB.NET

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Application Domains As Logical Units of Execution
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Operating systems and runtimes typically provide some form of isolation between applications running on the system. This isolation is necessary to ensure that code running in one application cannot adversely affect other, unrelated applications. In modern operating systems, this isolation is achieved by using hardware-enforced process boundaries, where a process, occupying a unique virtual address space, runs exactly one application and scopes the resources that are available for that process to use. Managed code execution has similar needs for isolation. Such isolation can be provided at a lower cost in a managed application, however, considering that managed applications run under the control of the common language runtime and are verified to be type-safe. The runtime allows multiple applications to be run in a single operating system process, using a construct called an application domain to isolate the applications from one another. Since all memory allocation requested by an application is done by the CLR, it is easy for the CLR to give an application access to only those objects that were allocated by the application and to block the application s attempts to access objects allocated in another application domain. In many respects, application domains are the CLR equivalent of an operating system process. Specifically, isolation in managed applications means the following: Different security levels can be assigned to each application domain, giving the host a chance to run the applications with varying security requirements in one process.
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CHAPTER 6 MODULES AND ASSEMBLIES
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Code running in one application cannot directly access code or resources from another application. (Doing so could introduce a security hole.) An exception to this rule is the base class library assembly of .NET Framework Mscorlib which is shared by all application domains within the process. Mscorlib is not shared between the processes. Faults in one application cannot affect other applications by bringing down the entire process. Each application has control over where the code loaded on its behalf comes from and what version the code being loaded is. In addition, configuration information is scoped by the application. The following examples describe scenarios in which it is useful to run multiple applications in the same process: ASP .NET runs multiple Web applications in the same process. In ASP and Internet Information Services (IIS), application isolation was achieved by process boundaries, which proved too expensive to scale appropriately it s cheaper to run 20 application domains in one process than to spawn 20 separate processes. Microsoft Internet Explorer runs code from multiple sites in the same process as the browser code itself. Obviously, code from one site should not be able to affect code from another site. Database engines need to run code from multiple user applications in the same process. Application server products might need to run code from multiple applications in a single process. Hosting environments such as ASP .NET or Internet Explorer need to run managed code on behalf of the user and take advantage of the application isolation features provided by application domains. In fact, it is the host that determines where the application domain boundaries lie and in what domain user code is run, as these examples show: ASP .NET creates application domains to run user code. Domains are created per application as defined by the Web server. Internet Explorer by default creates one application domain per site (although developers can customize this behavior). In Shell EXE, each application launched from the command line runs in a separate application domain occupying one process. Microsoft Visual Basic for Applications (VBA) uses the default application domain of the process to run the script code contained in a Microsoft Office document. The Windows Foundation Classes (WFC) Forms Designer creates a separate application domain for each form being built. When a form is edited and rebuilt, the old application domain is shut down, the code is recompiled, and a new application domain is created.
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