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OTA deployment works similar to how client/server applications were deployed in the past. Essentially, you deploy your application and a version manifest to a deployment server. You then distribute a link to the application to your users. When your users have a network connection, they download and install the application. When they run the application, the application compares the local manifest file against the server to see if an update is available. If a new version is available, the new version can be downloaded and installed. OTA deployment is depicted in Figure 5-17. Using the OTA approach, the initial download and subsequent updates are automated, so you can reach a large user base fairly easily. Moreover, the downloaded application can be stored in RAM or using Flash-based technology. The disadvantages of this approach are that the user must have a network connection and sufficient battery power to download the application or any updates. In addition, applying updates is generally left up to the user. When the user launches the application, the application compares the version stored locally against the version on the server. If the version on the server is later than the local version, the user is prompted to download and install the new version.

The ErrorClass object class is also an example of an object based on a scalar value, in this case, the value of $! If no initial value is given, the constructor defaults to using the current value of $! as the basis for the object it is about to return $! is an interesting value because it has divergent integer and string definitions This object simply blesses that value, which retains its dual nature even when copied to a new variable and allows the integer and string aspects of it to be retrieved by different accessors Here is a short script that demonstrates how this class can be used: #!/usr/bin/perl # errorpl use warnings; use strict; use ErrorClass; # generate an error unless (open IN, "nosuch.

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file") { my $error = new ErrorClass; print "Error object ", ref $error, "\n"; print "\thas number ", $error->number, "\n"; print "\thas message '", $error->message, "'\n"; print "It's not there! \n" if $error->isa("ErrorClass::ENOENT"); } Running this script produces this output: Error object ErrorClass::ENOENT has number 2 has message 'No such file or directory' It's not there! The last line of this script demonstrates the real point of the class Rather than checking numbers or using the Errno module to call a constant subroutine to determine the numeric value of the error, we convert the error into an object We can now, in a properly object-oriented way, check the type of an error by looking to see what kind of error object it is..

In object-oriented circles, the whole idea of multiple inheritance is fiercely debated, with many languages banning it outright The idea of multiple inheritance (inheriting from several parent classes at once) seems simple enough, but while multiple inheritance is very powerful, it is also a very quick route to object-oriented chaos It becomes less clear where an inherited method is inherited from, it becomes more complicated to ensure that objects destruct their resources in the right order, and it becomes possible to have complicated inheritance trees where two parents can inherit from the same grandparent (also called diamond inheritance) All of these issues make designing object classes for multiple inheritance much more difficult and more prone to error Perl abstains from this debate although it does allow it, it doesn t take great pains to support it either.

To inherit from more than one class is very simple indeed; we just place more than one class into the @ISA array: package My::Subclass; use Parent::Class::One; use Parent::Class::Two; our @ISA = qw(Parent::Class::One Parent::Class::Two); The base pragma allows us to instead write use base Parent::Class::One; use base Parent::Class::Two; When we come to call a method on My::Subclass, Perl will first check that the package actually implements it If it does, there is no problem; the method is called and its value returned If it does not, Perl checks for the method in the parent classes in @ISA, in the order in which they are defined This means that Parent::Class::One is searched first, including all the classes that it in turn inherits from If none of them satisfy the method call, Parent::Class::Two is searched.

The BlackBerry uses the same connection framework as defined in the MIDP standard, with some extra functionality specific to the BlackBerry platform.

If both packages (or an ancestor thereof) define the method, then only the one found in Parent::Class::One is called, and the version in Parent::Class::Two is never seen The manner of searching is therefore crucially affected by the order in which packages are named in @ISA The following statement is at first sight the same as the preceding one, but in actuality it differs in the order in which packages are searched, leading to potentially different results: our @ISA = qw(Parent::Class::Two Parent::Class::One);.

Note It is not good practice to force a download on users, because they could be using a dial-up connection or may not have sufficient battery supply.

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