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Components implemented by composites can also have references that are wired to services Similar to a composite service, a composite reference is created by promoting the reference of a contained component The earlier version of the credit score component contained an auditing component It is likely that this auditing capability will be needed by other components and is therefore a good candidate to be refactored into a generalized service used by the various loan application composites Refactoring the auditing component can be done by moving it to the parent LoanApplication composite, as shown in Figure 58

Rick Olson extracted a plugin from his popular Lighthouse application that allows you to easily seed the query cache with sets of objects that you know you will need It s a powerful complement to Active Record s built-in caching support Learn more about it at http://activereloadnet/2007/5/23/spend-less-time-in-thedatabase-and-more-time-outdoors

Logging The log file indicates when data is being read from the query cache instead of the database Just look for lines starting with CACHE instead of a Model Load

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Place Load (01ms) SELECT * FROM places WHERE (placesid = 15749) CACHE (00ms) SELECT * FROM places WHERE (placesid = 15749) CACHE (00ms) SELECT * FROM places WHERE (placesid = 15749)

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Default Query Caching in Controllers For performance reasons, Active Record s query cache is turned on by default for the processing of controller actions Limitations The Active Record query cache was purposely kept very simple Since it literally keys cached model instances on the SQL that was used to pull them out of the database, it can t connect multiple find invocations that are phrased differently but have the same semantic meaning and results For example, select foo from bar where id = 1 and select foo from bar where id = 1 limit 1 are considered different queries and will result in two distinct cache entries The active record context plugin3 by Rick Olson is an example of a query cache implementation that is a little bit smarter about identity, since it keys cached results on primary keys rather than SQL statements

Specifying the binding on a composite service will apply to all uses of the composite In contrast, specifying the binding in the component con guration will only apply to the speci c component Components implemented by composites can also have references that are wired to services

In these programs and others, an attacker supplies the vulnerable program with input that the program later includes in a format string argument To understand how formatted string functions are misused, consider the formatted output function printf() The format string that printf() accepts as its rst parameter is representative of most format strings The ISO C99 Standard describes the format string passed to printf() as follows:

The simplest way to manipulate attribute values is simply to treat your Active Record object as a plain old Ruby object, meaning via direct assignment using

myprop=(some_value)

The format string is composed of zero or more directives: ordinary characters (not %), which are copied unchanged to the output stream; and conversion speci cations, each of which results in fetching zero or more subsequent arguments Each conversion speci cation is introduced by the character % and ends with a conversion speci er [ISO C99, 2005]

There are a number of other different ways to update Active Record objects, as illustrated in this section First, let s look at how to use the update class method of

class ProjectController < ApplicationController def update Projectupdate(params[:id], params[:project]) redirect_to projects_path end def mass_update Projectupdate(params[:projects]keys, params[:projects]values]) redirect_to projects_path end end

Figure 58 also demonstrates how reference promotion is used to wire from a component contained in the credit score component to the auditing service In SCDL, reference promotion is done using the <reference> element (see Listing 510)

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