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A common technique used in event-driven programming is the callback The simplest way of understanding a callback is to think of a phone call Suppose you want to know if a stock price hits a certain level, and you ask your broker to call back when it does When the broker (the source of the event) notices that the stock price reflects your parameters, he or she calls you back, to notify you of the new price That's a callback

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The first thing to do in the design process is to create a task list This is essentially an English-language version of the script you plan to write In the list, you must break down the various things you want the script to perform in as much detail as possible I often go through several iterations of the task list, adding a bit more detail each time through Listing 41 shows what my first pass might look like Listing 41 Login script task list Your first task list should just summarize what you want the script to do

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Of course, in an object-oriented system, we're talking about software components or entire systems, not people When one object needs to be notified of events as they occur (as opposed to continually polling to see if an event has happened), a callback is used This is often a more efficient way of implementing a system, as the object doesn't need to periodically check the state of another object it is instead notified if an event is triggered Multiple listeners can register with the same event source, as shown in Figure 11-6 Figure 11-6 Multiple listeners can register with one or more event sources

Derived classes are responsible for implementing the save and initialize methods to store and restore persistent state:

/** * Save any changed preferences * * @return true on success */ abstract public boolean save();

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When an event is triggered (either as a result of an interaction with external objects or systems, or an internal process such as completing a work unit or interacting with a user), the event source will notify each and every registered listener (see Figure 11-7) This means that the event source must maintain a list of active listeners, and then pass a message back to them that an event has occurred, and optionally give some details Figure 11-7 Callback notification of event, for every registered listener

/** * Initialize the preferences (eg, from persistent storage) * * @return true if the preferences were * successfully initialized */ abstract protected boolean initialize();

Display a logon welcome message Map the N: drive based on group membership Map the R: drive based on group membership Map the S: drive based on group membership Map a printer and make it the default Base the printer selection on the user's physical location at the time

The next issue to understand about callbacks is how the notification is achieved Some systems are designed to send and receive messages, but how can one object pass information to another (and hence inform the object that an event has occurred) While you may not realize it, objects do this all the time, by invoking methods In object-oriented systems, callbacks are achieved by passing an object reference (the listener) to the object that is

A few utility methods help derived classes keep track of changes and of whether or not the in-memory state is consistent with the state of persistent storage:

/** * Report if the preferences have been initialized (eg, from * persistent storage) * * @return true if the preferences have been * initialized */ protected boolean isInitialized() { return _isInitialized; }

the event source The event source, at the appropriate time, will then invoke one of the listener's methods to notify it of an action and allow it to respond, as illustrated in Figure 11-8 A listener interface is defined for each major event type, and interested objects then register implementations of that interface with the listener Figure 11-8 Callback implemented by invoking a method on a listening object

* have been initialized (eg, from persistent storage) * * @param initialized true if the preferences * have been initialized */ protected void setInitialized( boolean initialized ) { _isInitialized = initialized; } /** * Get the hash table containing attributes that have changed * * @return the hash table of changed attributes */ protected Hashtable getChanges() { return _changed; }

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asp.net pdf 417 reader

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asp.net pdf 417 reader

asp.net pdf 417 reader