Scalability in Java

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The term "scalability" has two meanings:
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In the context of computational performance, scalability is an application's ability to perform under heavy loads--for example, large numbers of concurrent users In the context of user interfaces, scalability is the ability of a user interface to remain responsive as a user: Does increasingly complex work Tries to gain access to increasing numbers of interface objects--for example, file folders or device descriptions
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Without a scalable user interface and scalability in performance, an application can quickly fall from being highly responsive to being extremely unresponsive
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Perceived Performance, or Responsiveness
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Perceived performance, or responsiveness, is based on how fast an application seems to its users--how well it responds to them, not necessarily how fast it fulfills their requests
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Determining Acceptable Response Delays
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The term response delay refers to how long an application takes to acknowledge or fulfill a particular user request Providing responsiveness in an application depends on achieving response delays that are acceptable to users The longer an application's response delays are, the more time that its users lose when they make errors--especially if those errors are hard to correct Anxiety about making time-consuming errors can frustrate users, causing them to work more slowly yet make more errors because they lose their concentration Inappropriately short response delays can cause problems, too For example, one such problem occurs if an application displays and erases a message faster than users can read it If an application displays and erases successive sets of information faster than users can read them or respond to them, users nonetheless try to keep up As a result, they make more errors, because the application, though fast, does not keep pace with its users Some user interface events require shorter response delays than others For example, an application's response to a user's mouse click or key press needs to be much faster than its response to a request to save a file Table 13 shows the maximum acceptable response delay for typical interface events
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Table 13 Maximum Acceptable Response Delays for Typical Events
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User Interface Events
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Maximum Acceptable Response Delay
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Mouse click; pointer movement; window movement or resizing; key press; button press; drawing gesture; 01 second other user-input event involving hand-eye (100 milliseconds) coordination Displaying progress indicators; completing ordinary user commands (for example, closing a dialog box); completing background tasks (for example, reformatting a table)
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10 second
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Displaying a graph or anything else that a typical user would expect to take time (for example, displaying a 100 seconds new list of all a company's financial transactions for an accounting period) Accepting and processing all user input to any task 100 seconds
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In your application, make each response delay as short as possible, unless users need time to see the displayed information before it is erased Tools for Measuring Response Delays describes techniques for measuring response delays in your application The acceptable response delay for each event is based on a typical user's sense that the event is a logical point at which to stop or pause The greater that sense is, the more willingly the user will wait for a response Verify that your application responds to users' requests within the limits listed in Table 13 If the application cannot respond within those limits, it probably has one or more general problems--ones caused by a particular algorithm or module To find such problems, analyze the entire application in detail For example, one problem might be that your application requires a more powerful computer system than the one on which it was tested If so, work with your marketing representative to determine the true minimum system requirements for your application Verify that your application provides feedback within 100 milliseconds (01 second) after each key press, movement of the mouse, or other physical input from the user Verify that your application provides feedback within 100 milliseconds (01 second) after each change in the state of controls that react to input from the user--for example, displaying menus or indicating drop targets Verify that your application takes no longer than 1 second to display each progress indicator, complete each ordinary user command, or complete each background task
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