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SCA does not offer an alternative presentation-tier technology When it comes to user interfaces, SCA s mantra is integration Service tiers built with SCA can be integrated with a variety of client technologies, including Swing and rich-clients built using Adobe Flex, AJAX, and web frameworks, such as Struts and Java Server Faces (JSFs) Instead of a cursory overview of how SCA integrates with a wide variety of presentation-tier technologies, this chapter focuses on how Java EE web applications are used as front-ends to SCA services Speci cally, we cover how servlets and Java Server Pages (JSPs) access SCA services With this knowledge, it is possible to integrate SCA services with more sophisticated presentation-tier technologies, including the myriad of web frameworks that exist today

:render The render parameters to be used if verification fails :only Only apply this verification to the actions specified in the array (Single value

permitted)

Description The strcat() function appends a copy of the string pointed to by s2 (including the terminating null character) to the end of the string pointed to by s1 The initial character of s2 overwrites the null character at the end of s1

permitted)

Rails has built-in support for streaming binary content back to the browser, as opposed to its normal duties rendering view templates

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We again call on real-world programs to demonstrate the motivation for the following guidelines Use a Safe Bound Calculate the bound passed to strncat() by subtracting the current length of the destination string (as reported by strlen()) from the total size of the buffer Most errors related to the misuse of strncat() occur because of the unusual interface it implements when compared with other string-manipulation functions with an n in their name All the n functions accept a parameter that specifies the maximum amount of data they will write In most cases, it is safe for this value to equal the size of the destination buffer But the argument for strncat() must equal the amount of space remaining in the buffer In Example 624, we revisit code from a previous example that was proposed as a patch for vulnerable calls to the unbounded functions strcpy() and strcat() in Apache httpd In addition to patching several known vulnerabilities, the developer who proposed the patch took it upon himself to replace all calls to string-manipulation functions of the form strXXX() with calls to strnXXX() However, in the case of the code in Example 624, the addition of bounded calls to strncat() resulted in the introduction of a new error The call to strncat() could over ow record, depending on the size of user and cpw, because its bound is speci ed as the total size of the buffer, which already contains the values of user

The :text option of the render method optionally accepts a Proc object, which can be used to stream on-the-fly generated data to the browser or control page generation

As a component-based technology, it may not be surprising that SCA has the notion of a web component Web components are Java EE web applications con gured as components What does this mean In a nutshell, it is the way servlets and JSPs can be wired to SCA services This brings SCA protocol abstraction bene ts to the

on a fine-grained basis The latter should generally be avoided unless you know exactly what you re doing, as it violates the separation between code and content Two arguments are passed to the proc you supply, a response object and an output object The response object is equivalent to the what you d expect in the context of the controller, and can be used to control various things in the HTTP response, such as the Content-Type header The output object is an writable IO-like object, so one can call write and flush on it The following example demonstrates how one can stream a large amount of on-thefly generated data to the browser:

# Streams about 180 MB of generated data to the browser render :text => proc { |response, output| 10_000_000times do |i| outputwrite("This is line #{i}\n") end }

strncpy(record, user, MAX_STRING_LEN - 1); strcat(record, ":"); strncat(record, cpw, MAX_STRING_LEN - 1);

Rails also supports sending buffers and files with two methods in the ActionController::Streaming module: send_data and send_file

492 send data(data, options = {})

presentation tier; similar to Java-based components, servlets and JSPs can invoke services without having to resort to low-level, transport-speci c APIs

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