Object::Base

Multi-threaded base class to establish a class deriving relationship with parent classes

package Foo;
use Object::Base;
my $attr3_def = 6;
my $attr3_val;
attributes ':shared', 'attr1', 'attr2', ':lazy',
	'attr3' => {
		'default' => sub {
			my ($self, $attr) = @_;
			$attr3_val = $attr3_def;
			return $attr3_def;
		},
		'getter' => sub {
			my ($self, $attr, $current_value) = @_;
			return $attr3_val+1;
		},
		'setter' => sub {
			my ($self, $attr, $current_value, $new_value) = @_;
			$attr3_val = $new_value-1;
		},
	};

package Bar;
use Object::Base 'Foo';
attributes 'attr3', ':shared' => undef, 'attr2' => undef;

package main;
use threads;
use threads::shared;

# object of Foo
my $foo = Foo->new();

# usage of attribute
$foo->attr1(1);
print $foo->attr1, "\n"; # prints '1'

# attributes are lvalued
$foo->attr1++;
print $foo->attr1, "\n"; # prints '2'

# special attribute ':shared'
print "\$foo is ", is_shared($foo)? "shared": "not shared", "\n";

# attributes can have modifiers: default, getter, setter
print "attr3 value ", $foo->attr3, " and stored as $attr3_val", "\n"; # prints 'attr3 value 7 and stored as 6'

# object of derived class Bar
my $bar = Bar->new();

# attributes can be added derived classes
$bar->attr3(3);

# attributes are inheritable
$bar->attr1(3);

# attributes are overridable #1
eval { $bar->attr2 = 4 }; print "Eval: $@"; # prints error 'Eval: Attribute attr2 is not defined in Bar at ...'

# attributes are overridable #2
print "\$bar is ", is_shared($bar)? "shared": "not shared", "\n"; # prints '$bar is not shared'

# assigning ref values to shared class attributes
eval { $foo->attr2 = { key1 => 'val1' } }; print "Eval: $@"; # prints error 'Eval: Invalid value for shared scalar at ...'
$foo->attr2({ key2 => 'val2' }); # uses shared_clone assigning ref value
print $foo->attr2->{key2}, "\n"; # prints 'val2'

# attributes in thread
my $thr1 = threads->create(sub { $foo->attr1 = 5; $bar->attr1 = 5; });
my $thr2 = threads->create(sub { sleep 1; print "\$foo is shared and attr1: ", $foo->attr1, ", \$bar is not shared and attr1: ", $bar->attr1, "\n"; });
$thr1->join();
$thr2->join();

Object::Exception

Multi-threaded base exception class

package SampleException;
use Object::Base qw(Object::Exception);

package main;
use Object::Exception;

# Enable DEBUG for traceback
our $DEBUG = 1;

# throws Object::Exception type and its msg: Exception1
eval {
	throw("Exception1");
};
if ($@) {
	warn $@ if ref($@) eq "Object::Exception";
}

# throws SampleException type and its msg: This is sample exception
sub sub_exception()
{
	SampleException->throw("This is sample exception");
}
eval {
	sub_exception();
};
if ($@) {
	# $@ and $@->message returns same result
	warn $@->message if ref($@) eq "SampleException";
}

# throws Object::Exception type and its message: SampleException. Because msg is not defined!
eval {
	SampleException->throw();
};
if ($@) {
	if (ref($@) eq "SampleException")
	{
		warn $@
	} else
	{
		# warns 'This is type of Object::Exception and its message: SampleException'
		warn "This is type of ".ref($@)." and its message: $@";
	}
}

INSTALLATION

To install this module type the following

perl Makefile.PL
make
make test
make install

from CPAN

cpan -i Object::Base

DEPENDENCIES

This module requires these other modules and libraries:

• threads

• threads::shared

• forks

REPOSITORY

GitHub https://github.com/orkunkaraduman/p5-Object-Base

CPAN https://metacpan.org/release/Object-Base

AUTHOR

Orkun Karaduman <orkunkaraduman@gmail.com>

COPYRIGHT AND LICENSE

Copyright (C) 2017 Orkun Karaduman <orkunkaraduman@gmail.com>

This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.