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Up to this point, we have discussed how services and components provide reuse and encapsulation in several ways First, services provide a way for multiple clients to address and invoke a unit of code contained in a component Services also provide encapsulation as they hide implementation details from clients Component implementations may be reused multiple times, potentially with different property values and wiring For many applications, this level of reuse and encapsulation is suf cient However, as an application becomes more complex and the number of components grows, the need may arise to encapsulate sets of components that expose a few services A credit appraisal process may be composed of multiple components but needs to expose only one service to its clients Here, the fact that the credit appraisal process is handled by multiple components is an implementation detail; in the future, these internal components and their wiring may change In addition, as system complexity grows, the need may arise to reuse not just single components, but sets of components Perhaps a group of components together perform an operation such as validating and persisting an employee record to a database It would be bene cial to reuse this set of components as a single unit across a number of disparate applications, hiding the details of the components from clients It would also be useful if there were facilities for making slight con guration changes to the components as a whole, rather than modifying the individual components To handle these cases encapsulation and reuse of multiple, related components SCA supports composition, or the capability to assemble larger components from smaller ones SCA does this in a very simple but powerful way Consider the visual representation of encapsulation shown in Figure 51 The composite contains four components, three of which interact to provide a service to the fourth A component that performs credit scoring may use data validation and auditing components These details should be hidden from clients using the credit-scoring service A solution to this problem would be to allow components to be composed from other components like building blocks We can modify the previous diagram to include this composite component, as illustrated in Figure 52.

In legacy systems, compiler-enforced bans might be too drastic In these situations, consider using a static analysis tool with structural rules set to a high severity level to enforce the security policy until all the calls in question have been replaced When most of the bad calls have been removed, move up the ladder and nish the job using the compiler to enforce the ban For example, use the following rule to ag all uses of

Or you can break them out into separate lines, like this:

In contrast to the somewhat similar callback methods of Active Record, you can t implement a filter method on a controller by adding a method named before_filter or after_filter You should make your filter methods protected or private; otherwise, they might be callable as public actions on your controller (via the default route) Tim says

strcpy() as high-severity vulnerabilities:

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In addition to protected and private, one can declare a method should never be dispatched with the more intention-revealing hide_action

Importantly, filters have access to request, response, and all the instance variables set by other filters in the chain or by the action (in the case of after filters) Filters can set instance variables to be used by the requested action, and often do so

The composite component encapsulates the three components and their wires by exposing a single service to clients SCA takes this a step further and makes the composite itself a type of component In other words, composites are a component implementation type just like Java, BPEL, or C++ Our earlier diagram can now be represented as a series of nested components (see Figure 53)

Structural rule:

Controller inheritance hierarchies share filters downward Your average Rails application has an ApplicationController from which all other controllers inherit, so if you wanted to add filters that are always run no matter what, that would be the place to do so

Subclasses can also add and/or skip already defined filters without affecting the superclass For example, consider the two related classes in Listing 41, and how they interact

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