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import orgosoascaannotationsAllowsPassByReference; @AllowsPassByReference public class LoanComponent implements LoanService { LoanResult apply(LoanRequest request) { } }

class Timesheet < ActiveRecord::Base def billable_hours_outstanding if submitted billable_weeksmap(&:total_hours)sum else 0 end end def selfbillable_hours_outstanding_for(user) usertimesheetsmap(&:billable_hours_outstanding)sum end end

public static void main(String[] args) throws IOException { String regex = "^[0-9\\-\\ ]+$"; Pattern p = Patterncompile(regex); for (int i=0; i < argslength; i++) { String num = args[i]trim(); Matcher m = pmatcher(num); if (mmatches()) { dialNumber(num); } else { Systemoutprintln("Not a valid phone number"); } } }

I m not suggesting that this is good code It works, but it s inefficient and that if/else condition is a little fishy Its shortcomings become apparent once requirements emerge about marking a Timesheet as paid It forces us to modify Timesheet s billable_hours_outstanding method again:

def billable_hours_outstanding if submitted && not paid billable_weeksmap(&:total_hours)sum else 0 end end

Of course, an argument such as -- - -- - - -- - -- --- - -- (Morse code for "give me back my dime") is accepted, but a more sophisticated regular expression can better limit the input to valid phone numbers, as shown in Example 511

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That latest change is a clear violation of the open-closed principle,6 which urges you to write code that is open for extension, but closed for modification We know that we violated the principle, because we were forced to change the billable_hours_outstanding method to accommodate the new Timesheet status Though it may not seem like a large problem in our simple example, consider the amount of conditional code that will end up in the Timesheet class once we start having to implement functionality such as paid_hours and unsubmitted_hours

Generally, @AllowsPassByReference is used on an interface However, if a service contains multiple operations, some of which modify parameters, the annotation may be used on a per-operation basis

95 Single-Table Inheritance (STI)

So what s the answer to this messy question of the constantly changing conditional Given that you re reading the section of the book about single-table inheritance, it s probably no big surprise that we think one good answer is to use object-oriented inheritance To do so, let s break our original Timesheet class into four classes

Example 511 This regular expression matches only phone numbers that are valid syntax in the United States

class Timesheet < ActiveRecord::Base # non-relevant code ommitted def selfbillable_hours_outstanding_for(user) usertimesheetsmap(&:billable_hours_outstanding)sum end end class DraftTimesheet < Timesheet def billable_hours_outstanding 0 end end

class SubmittedTimesheet < Timesheet def billable_hours_outstanding billable_weeksmap(&:total_hours)sum end end

// A separator is some whitespace surrounding a or - String sep = "\\s*[-] \\s*"; // A phone number is an optional 1 followed by a three // digit area code, a three digit prefix, and a four digit // number String regex = "(1"+sep+") \\d{3}"+sep+"\\d{3}"+sep+"\\d{4}";

Now when the requirements demand the ability to calculate partially paid timesheets, we need only add some behavior to a PaidTimesheet class No messy conditional statements in sight!

When a client makes a non-blocking invocation, the SCA runtime returns control immediately to it and performs the call on another thread

class PaidTimesheet < Timesheet def billable_hours_outstanding billable_weeksmap(&:total_hours)sum - paid_hours end end

Regular expression matching is a powerful tool for input validation, and regular expressions have been built into the Java class library since the javautilregex package was introduced in JDK 15 But in our experience, C and C++ programmers tend to shy away from regular expressions, perhaps because there is no de facto standard implementation Although POSIX does mandate a standard interface (usually found in regexh), the interface has a reputation for portability problems Our preferred solution is the open source Perl Compatible Regular Expressions (PCRE) library (http://wwwpcreorg) As the name suggests, it supports the widely used Perl regular expression syntax It is distributed under a BSD license (meaning that you can include it in a commercial product without much fuss), and it comes with a set of C++ wrapper classes donated by Google The code in Example 512 is a C version of Example 510 It uses the PCRE library to perform the same pattern match as Example 510: It checks its input to make sure that it contains only digits, spaces, dashes, and periods

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