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So far, the sample application can send messages back and forth between the worker and the UI threads without a care in the world The UI thread doesn't have to wait for the worker thread to complete or even be notified on completion, because the worker thread communicates its progress as it goes Similarly, the worker thread doesn't have to wait for the UI thread to show progress as long as progress messages are sent at regular intervals to keep users happy However, one thing doesn't make users happy: not having full control of any processing that their applications are performing Even though the UI is responsive while pi is being calculated, users would still like the option to cancel the calculation if they've decided they really need 1,000,001 digits and they mistakenly asked for only 1,000,000 Figure 146 shows an updated UI for CalcPi that allows cancellation

The earliest version of the command line in the Microsoft world was MSDOS, which was based around commandcom Although antiquated, MSDOS exists even in the latest OSs (except for the 64-bit versions) Commandcom was used not just in DOS, but also it was the default shell for Windows 95, 98, and Me The rst program to run at boot time was responsible for parsing and executing the autoexecbat and con gsys content Commandcom (a 16-bit environment) was replaced as the shell for Windows NT, and a new 32-bit command line interface (and, subsequently, a 64-bit version) was provided for Windows NT (known as CMDEXE, which the next section discusses) However, commandcom was and is still supplied for 16-bit application backward-compatibility When run, it executes in NTVDM (NT Virtual DOS Machine), which is the name of the process if you look at a commandcom instance To start commandcom from the Run windows, press Start key+R and type commandcom The title of the Window will be as follows:

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Notice its title is Windows DOS, and instead of showing the full path of the user, it shows only its 83 representation, because the 16-bit DOS window does not understand long lenames You are essentially in a legacy DOS environment One difference from the old-style commandcom is that autoexecbat and con gsys have been replaced with autoexecnt and con gnt These les are stored in the %systemroot%\system32 folder instead of the root of the system partition Any commands or environmental con guration you want applied to the commandcom environment should be placed into these nt les This NTVDM runs any MS-DOS or Win 16 executable (a 16-bit program) If you try to execute a 32-bit program from commandcom, it passes it up to the 32-bit command shell for handling and subsequent execution

Why is commandcom not available in the 64-bit versions of Windows 2003, XP, Vista, and Windows Server 2008 Server Let s review the

Implementing cancel for a long-running operation is a multistep process First, you need to provide a UI that lets the user cancel the operation In this case, the Calc button is changed to a Cancel button after the calculation has begun Another popular choice is to display a separate progress dialog, which typically includes current progress details, a progress bar

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An RBAC authorization service provides the kind of fine-grained authorization that a firewall is unable to provide With RBAC, a user is assigned one or more roles, and protected resources are set as accessible by one or more roles When a user requests access to a resource, access is granted only if one of the user s roles is also in the set of allowed roles There are a number of Rails plugins for RBAC, but they re usable only from within a Rails app A more general RBAC solution is necessary for use with Sinatra or other Rack-based services This section covers implementing RBAC as a Rack adapter and associated service It allows for all access rules to exist in a single service, which can be scaled independently of the other services In addition, it provides a write-once, implement-everywhere approach to RBAC security If RBAC does not fit your particular need, this form of Rack adapter and associated service could also be used to implement other authorization mechanisms such as user-based access control

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