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selfstatusbarafter(timeout, selfclearStatusBar)

Limits the total number of simultaneous calls that will be processed Limits the maximum number of concurrent sessionful channel connections to a service Limits the maximum number of concurrent instances to a service

This method sets the status bar label s text, and if there is a timeout (a vesecond timeout is the default), the method sets up a single shot timer to clear the status bar after the timeout period

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def fileOpen(self, *ignore): if not selfokayToContinue(): return dir = (ospathdirname(selffilename) if selffilename is not None else "") filename = tkinterfiledialogaskopenfilename( title="Bookmarks - Open File", initialdir=dir, filetypes=[("Bookmarks files", "*bmf")], defaultextension="bmf", parent=selfparent) if filename: selfloadFile(filename)

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This method starts off the same as MainWindowfileNew() to give the user the chance to save any unsaved changes or to cancel the le open action If the user chooses to continue we want to give them a sensible starting directory, so we use the directory of the current le if there is one, and the current working directory otherwise The filetypes argument is a list of (description, wildcard) 2-tuples that the le dialog should show If the user chose a lename, we set the current lename to the one they chose and call the loadFile() method to do the actual le reading Separating out the loadFile() method is common practice to make it easier to load a le without having to prompt the user For example, some programs load the last used le at start-up, and some programs have recently used les listed in a menu so that when the user chooses one the loadFile() method is called directly with the menu option s associated lename

Both the and the have default values that can potentially limit the throughput in a production environment You will want to adjust these settings if your services need to accept more throughput and your servers have resources available to handle the additional load Just be aware of the potential impact these settings have on denial-of-service attacks Listing A4 shows how to adjust these settings using con guration

def loadFile(self, filename): selffilename = filename selflistBoxdelete(0, tkinterEND) selfdirty = False try: with open(selffilename, "rb") as fh: selfdata = pickleload(fh) for name in sorted(selfdata, key=strlower): selflistBoxinsert(tkinterEND, name) selfsetStatusBar("Loaded {0} bookmarks from {1}"format( selflistBoxsize(), selffilename)) selfparenttitle("Bookmarks - {0}"format( ospathbasename(selffilename)))

This example illustrates how the APIs discussed in this chapter can be used to form a simple game The user controls a car that is always moving forward at a constant speed and can be turned 90 degrees clockwise or counterclockwise The object of the game is to drive around the track and collect as many coins as possible without hitting any of the walls (See Figure 1216 on the next page)

except (EnvironmentError, picklePickleError) as err: tkintermessageboxshowwarning("Bookmarks - Error", "Failed to load {0}:\n{1}"format( selffilename, err), parent=selfparent)

When this method is called we know that any unsaved changes have been saved or abandoned, so we are free to clear the list box We set the current lename to the one passed in, clear the list box and the dirty ag, and then attempt to open the le and unpickle it into the selfdata dictionary Once we have the data we iterate over all the bookmark names and append each one to the list box Finally, we give an informative message in the status bar and update the window s title bar If we could not read the le or if we couldn t unpickle it, we pop up a warning message box to inform the user

The HTTP 11 speci cation includes a feature called HTTP Keep-Alives HTTP Keep-Alives allow for HTTP connections to be persisted connections between clients and servers This allows clients to keep connections open so that they can be reused for subsequent requests To limit the resources used by a single client, the HTTP 11 speci cation speci es a maximum of two connections per server from an application By default, HTTP clients in the NET Framework use HTTP 11 Keep-Alives including WCF binding element leverages classes The namespace for managing and making HTTP found in the binding element uses the requests The class to make HTTP requests The class and , to manage uses other classes, HTTP connections These classes help manage HTTP connections including

def fileQuit(self, event=None): if selfokayToContinue(): selfparentdestroy()

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