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Before getting into speci c optimizations, it is worth spending a little time exploring the cost, in terms of execution time, of common operations like accessing instance variables and invoking methods Those listed below are ordered from most to least expensive Class instance creation Array creation Method invocation Instance and class (static) variable access Array access6 Local variable access

In this chapter, we will complete the core sample application by adding a social layer that allows users to follow (and unfollow) other users, resulting in each user s Home page displaying a status feed of the followed users microposts We will also make views to display both a user s followers and the users each user is following We will learn how to model user following in Section 121, and then make the web interface in Section 122 (including an introduction to Ajax) Finally, we ll end by developing a fully functional status feed in Section 123 This final chapter contains some of the most challenging material in the tutorial, including a complicated data model and some Ruby/SQL trickery to make the status feed Through these examples, you will see how Rails can handle even rather intricate data models, which should serve you well as you go on to develop your own applications with their own specific requirements To help with the transition from tutorial to independent development, Section 124 contains suggested extensions to the core sample application, along with pointers to more advanced resources As usual, Git users should create a new topic branch:

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Retrieve data in XML format With SQL Server you can issue queries and receive results formatted in XML You can even control the format of the results through various means You're not limited to issuing SQL queries; you can query relational databases with the XML query language XPath

Because the material in this chapter is particularly challenging, before writing any code we ll pause for a moment and take a tour of user following As in previous chapters, at this early stage we ll represent pages using mockups1 The full page flow runs as

As discussed in Section 113, object creation is a very expensive operation, and creating class instances takes longer than creating new arrays Method invocations, either static or instance, are also time consuming They take about 5 to 10 times longer than storing or retrieving instance or static eld values The difference in execution speed of array access and eld accesses isn t usually too dramatic Finally, by comparison to the other operations listed, working with local variables is very fast In certain cases, an application can save a lot of time by moving some

1 The photographs in the mockup tour are from http://wwwflickrcom/photos/john_lustig/2518452221/ and http://wwwflickrcom/photos/30775272@N05/2884963755/

6 This assumes single-dimensional arrays The use of multidimensional arrays is very expensive, both in terms of memory usage and access time

follows: a user (John Calvin) starts at his profile page (Figure 121) and navigates to the Users page (Figure 122) to select a user to follow Calvin navigates to the profile of a second user, Thomas Hobbes (Figure 123), clicking on the Follow button to follow that user This changes the Follow button to Unfollow , and increments Hobbes s followers count by one (Figure 124) Navigating to his home page, Calvin now sees an incremented following count and finds Hobbes s microposts in his status feed (Figure 125) The rest of this chapter is dedicated to making this page flow actually work

Our first step in implementing user following and followers is to construct a data model, which is not as straightforward as it seems Na vely, it seems that a has_many relationship should do: a user has_many following and has_many followers As we will see, there is a problem with this approach, and we ll learn how to fix it using has_many :through It s likely that many of the ideas in this section won t seem obvious at first, and it may take a while for the rather complicated data model to sink in If you find yourself getting confused, try pushing forward to the end; then, read the section a second time through to see if things are clearer

Work with XML documents on the database server In addition to formatting query results in XML, you can also work directly with XML documents on the database server You can even use the data in XML documents to populate and modify data in your relational databases

3

1211 A Problem with the Data Model (and a Solution)

public void enableReceiveThreshold(int thresh) throws UnsupportedCommOperationException public void disableReceiveThreshold()

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