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The second design pattern that we study with regards to aspect-oriented programming techniques is the Observer. We begin by providing a quick description of this pattern, and proceed by giving an implementation of the pattern using AspectJ. We then conclude this section with an evaluation of the implementation.

Formats a string by replacing placeholders with provided values with locale specificity Returns a boolean value indicating whether or not the start of the String object matches the specified string Removes leading and trailing spaces from a String object Removes trailing spaces from a String object Removes leading white spaces from a String object

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In many situations, programmers need to be aware of objects state changes or pay attention to the events produced by objects. For example, a text editor must activate the saving functionality when a file is modified. Other examples can be found in frameworks for building graphical user interfaces. For instance, Swing heavily relies on the mechanism known as listeners; listeners are objects that consume events emitted by other objects and react to these events. The Observer design pattern consists of notifying observer objects when the states of other objects, called subjects, change. Hence, a pure object-oriented, aspect-free implementation of the observer design pattern generally relies on two interfaces: Observer and Subject. The Subject interface is implemented by all observed classes and provides methods for registering and removing observers. The Observer interface is implemented by observers and provides methods for notifying state changes.

The following small script illustrates usage of some of the main methods of the String extension:

<property> <address>98320 County Rd 113</address> <price>$115,000</price> <comments>Small acreage outside of town</comments> </property> </properties> The JavaScript for actually sending the request to the server and responding to its response is the same as previous examples The differences begin in the handleReadyStateChange function Assuming the request completes successfully, the first thing that happens is that the content created by any previous searches is deleted by calling the clearPreviousResults function The clearPreviousResults function performs two tasks: removing the Results header text that appears at the top and clearing any rows from the results table The header text is removed by first checking to see whether the span that surrounds the header text has any children by using the hasChildNodes method.

In this section, we propose an aspect-oriented implementation of the Observer design pattern. With our solution, the management of observers and the detection of state changes are handled by an aspect. First, an AspectJ abstract aspect is defined to implement the generic part of the code. This aspect can be reused for all observers. Second, this aspect is extended to take into account the needs of real observers.

<script language=javascript type="text/javascript"> var asp = " ASP"; var dotnet =".NET "; var ajax = " Ajax "; alert (String.format("{0}{1} {2} String Extension!", asp.trimStart(),dotnet.trimEnd(),ajax.trim())); </script>

You know that the header text exists if the hasChildNodes method returns true; if it does, delete the first (and only) child node of the span element, as that child node represents the header text The next task in clearPreviousResults is to delete any rows that may already be in the table displaying the search results Any result rows are child nodes of the tbody node, so you start by obtaining a reference to that node using the documentgetElementById method Once you have the tbody node, you iterate for as long as the tbody node has child nodes, where the child nodes are tr elements During each iteration the first child node in the childNodes collection is removed from the table body The iteration ends once no more rows are left in the table body The table of search results is built in the parseResults function.

The code of the abstract aspect is presented in Listing 8-9. Listing 8-9. Implementation of the Observer Design Pattern Using AspectJ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 package aop.patterns.observer; import java.util.Enumeration; import java.util.Vector; public abstract aspect AbstractObserverAspect pertarget (subject()) { private Vector observers = new Vector(); public void addObserver(Object o) { observers.add(o); } public void removeObserver(Object o) { observers.remove(o); } protected abstract pointcut subject();

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