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Calls to remotable services that take place over a network are typically orders of magnitude slower than in-process invocations In addition, a particular service invocation may take a signi cant amount of time to complete; perhaps hours, days, or even months This makes it impractical for clients to wait on a response or to hold a network connection open for an extended period of time In these cases, SCA provides the ability to specify non-blocking operations When a client makes a non-blocking invocation, the SCA runtime returns control immediately to it and performs the call on another thread This allows clients to continue performing work without waiting on a call to complete Asynchronous communications have a long history in MOM technologies and differ substantially from the synchronous communication styles adopted by technologies including RMI, EJB, DCOM, and NET Remoting A downside to asynchronous interactions is that they tend to be more complex to code than synchronous invocations However, asynchronous communications are more loosely coupled then synchronous variants and provide a number of bene ts that outweigh the additional complexity in many situations Because a client does not wait on a non-blocking call, the SCA runtime can perform multiple retries if a target service is not available without blocking the client This is particularly important for remote communications where service providers may be rendered temporarily unavailable due to network interruptions Asynchronous interactions have an additional advantage in that they generally improve application scalability They do this by enabling clients to perform other tasks while a call is outstanding Non-blocking operations also let clients make a series of parallel invocations, potentially reducing the amount of time required to complete a request as operations do not need to be performed serially In addition, particularly in cases where an operation may take a long time to complete, non-blocking operations allow runtimes to hold network resources for shorter periods of time and not have to wait on a response To summarize, the advantages of asynchronous interactions include the following:.

class C def initialize(x, y) @x, @y = x, y end end Cnew(0, 1)instance_variable_names # => ["@y", "@x"]

B375 active support/core ext/object/

Example 513 lists a block of code from Apache Tomcat Version 5131 It mistakenly assumes that the only special characters of any consequence are greater than (>), less than (<), ampersand (&), and double quote (")

B376 active support/core ext/object/

with options(options)

Asynchronous communications are more loosely coupled than synchronous variants and provide a number of bene ts that outweigh the additional complexity in many situations

Example 513 This blacklist from Apache Tomcat Version 5131 mistakenly assumes that only four special characters in a single encoding are of any consequence in the context of a Web page

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class Post < ActiveRecord::Base with_options(:class_name => 'Comment', :order => 'id desc') do |post| posthas_many :approved, :conditions => ['approved = ', true] posthas_many :unapproved, :conditions => ['approved = ', false] posthas_many :all_comments end end

load(file, *extras)

for (int i = 0; i < contentlength; i++) { switch (content[i]) { case '<': resultappend("<"); break; case '>': resultappend(">"); break; case '&': resultappend("&"); break; case '"': resultappend("""); break; default: resultappend(content[i]); } }

require(file, *extras)

require association(file name)

They are more loosely coupled They tend to be more scalable Fewer network resources are held for long periods of time

Used internally by Rails Invokes Dependenciesassociate_with (file_name)

The blacklisted characters suggest that the author was thinking about preventing cross-site scripting in HTML but failed to consider what might happen if the data Tomcat was processing were destined for a dynamically generated JavaScript le, where the special characters include comma (,) and parentheses ((, )); a cascading style sheet, where colons (:) and semicolons (;) are critical; or a variety of other types of pages that an application is likely to display, where various characters can take on metameaning Furthermore, if the page being generated uses an alternate encoding, such as UTF-7, an attacker might be able to slip one of the explicitly blacklisted characters past the lter by encoding it in an unexpected way The result is that this code is terribly frail It might prevent cross-site scripting in the one case that the developer has thought through, but it offers little protection in other situations

require dependency(file name)

Used internally by Rails Invokes Dependenciesdepend_on(file_name)

try { Statement stmt = conncreateStatement(); ResultSet rs = stmtexecuteQuery(CXN_SQL); harvestResults(rs); stmtclose(); } catch (SQLException e){ log loggerlog(LevelERROR, "error executing sql query", e); }

require or load(file name)

Used internally by Rails Invokes Dependenciesrequire_or_load(file_name)

Although there is no hard-and-fastrule, non-blocking operations should be used for remotable services when possible

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