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hv_store(serial,"number",6,newSViv($var.number), 0); $var = newSVrv((SV*)serial, "Serial"); } The second argument to newSVrv is passed to bless, so this blesses the hash reference into the package Serial. If we leave it as NULL, then we just get a regular unblessed hash reference. So, how about the second approach The standard typemap defines a Perl type T_PTROBJ, which simply assigns a pointer to any kind of structure to an SV using sv_setref_pv. The result of this mapping is that an XSUB gets to manipulate the native data type directly. For example, to create a new serial_t structure, we could write this into an XS file: serial_t * newserial(name, nummber) char *name; int number; CODE: RETVAL = (serial_t *)Safemalloc(sizeof(serial_t)); RETVAL->name = savepv(name); RETVAL->number = number; OUTPUT: RETVAL; And to access the number member: int number(serial) serial_t *serial; CODE: RETVAL = serial->number; OUTPUT: RETVAL In Perl, we can now write code like this: use Serial; my $serial=newserial("Number 6" => 6); my $number=$serial->number(); Converting this into a Serial object in Perl is simply a matter of writing a new subroutine that wraps newserial and blesses a reference to the returned scalar, to pick one of several possible approaches. We are creating new C variables dynamically here, so we need to allocate memory. safemalloc and savepv are supplied by Perl s API to provide equivalents of C memory allocation functions that will always play nicely with the Perl interpreter. The savepv function is the Perl supplied version of strdup, for example. We should generally always use the functions provided by Perl for this purpose.

Dealing with C++ objects is not so different from C objects. Since C++ classes are by definition opaque values, we cannot reasonably make use of a typemap to do all the work for us, so we are left with the T_PTROBJ approach. Since handling objects is a common requirement, we can make use of the perlobject.map file by Dean Roehrich. This is a useful aid to creating a Perl/C++ class extension that includes a O_OBJECT type, among other types, which automatically takes care of converting between a blessed Perl object of the Perl class and a pointer to a C++ object instance. It is nearly identical to this example typemapping adapted from the perlxs manual page (most of which should now be understandable to us):

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INPUT O_OBJECT if (sv_isobject($arg) && (SvTYPE(SvRV($arg)) == SVt_PVMG)) { $var = ($type)SvIV((SV*)SvRV($arg)); } else { Perl_warn(aTHX_ \"${Package}::$func_name() -- $var is not a blessed SV reference\" ); XSRETURN_UNDEF; } OUTPUT O_OBJECT sv_setref_pv($arg, CLASS, (void*)$var); The only mysterious entity here is Svt_PVMG, which is simply the return value of SvTYPE for a blessed Perl reference, though it is interesting to note the use of Perl_warn with an apparently interpolated string (it isn t, of course, but the text is expanded by xsubpp). This typemap will handle the casting of the blessed scalar to and from an object of the correct C++ type. We still have to supply the logic to manage the transformation from the opaque C++ reference to Perl object, though. The equivalency statement for a C++ class MyClass would look like this: MyClass * O_OBJECT

Before we look at a Reactor example, let s take a step back. One of the handiest features in ColdFusion is how easy it is to query data from a database. We re all familiar with code that looks like Listing 29-1. Listing 29-1. A sample traditional query <cfquery name="getUsers" datasource="myDSN"> SELECT * FROM User </cfquery> <cfoutput query="getUsers"> <p>#firstName# #lastName#</p> </cfoutput> This is how we all wrote code a few years ago. Query data and output it, all within one .cfm file. The ease with which you can query and manipulate data in ColdFusion is not only one of its greatest strengths, but also its Achilles heel. Take a minute and read over that fragment of code and ponder what might go wrong. Go ahead I ll wait for you! You probably came up with at least one problem. I saw several, including the hard-coded database source name, the query commingled with display logic, and the procedural, spaghetti nature of the code. Today, a range of frameworks are available to help you with some of these problems. For example, ColdSpring can help you configure your data source. Model-Glue, Fusebox, Mach-II, and others can help you separate your application s logic from its presentation tier. Reactor will help you create a reusable set of object-oriented components that you can use to access your database.

Let s assume we also call the Perl extension MyClass.pm and create an example constructor, object method, and destructor to map to this C++ class. The key detail to add is to prefix the XSUB subroutine name with a class name and ::. This tells xsubpp that we are mapping onto a C++ class and causes two new macros to be defined: THIS: The C++ object instance CLASS: The C++ class type

Remember also that it s not just failure you need to plan for. One of the big advantages of using multiple machines is that you have the opportunity to perform rolling upgrades or maintenance, taking each machine offline in turn.

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