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package Callback; |
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4
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require Exporter; |
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require UNIVERSAL; |
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$VERSION = $VERSION = 1.07; |
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@ISA = (Exporter); |
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@EXPORT_OK = qw(@callbackTrace); |
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3261
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use strict; |
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3849
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sub new |
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{ |
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0
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30529
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my ($package,$func,@args) = @_; |
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my ($p, $file, $line) = caller(0); |
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my @method; |
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100
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if (ref $func ne 'CODE' && UNIVERSAL::isa($func, "UNIVERSAL")) { |
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100
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if ($func->isa('Callback')) { |
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2
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100
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return $func unless @args; |
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1
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my $new = bless { %$func }, $package; |
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1
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push(@{$new->{ARGS}}, @args); |
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2
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1
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return $new; |
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} else { |
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my $method = shift @args; |
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my $obj = $func; |
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$func = $obj->can($method); |
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100
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unless (defined $func) { |
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1
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require Carp; |
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1
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315
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Carp::croak("Can't locate method '$method' for object $obj"); |
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} |
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unshift(@args, $obj); |
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@method = (METHOD => $method); # For Storable hooks |
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} |
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} |
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my $x = { |
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FUNC => $func, |
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ARGS => [@args], |
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CALLER => "$file:$line", |
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@method |
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}; |
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return bless $x, $package; |
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} |
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sub call |
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{ |
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0
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my ($this, @args) = @_; |
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my ($ret, @ret); |
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15
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unshift(@Callback::callbackTrace, $this->{CALLER}); |
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if (wantarray) { |
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0
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@ret = eval {&{$this->{FUNC}}(@{$this->{ARGS}},@args)}; |
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0
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} else { |
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$ret = eval {&{$this->{FUNC}}(@{$this->{ARGS}},@args)}; |
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} |
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100
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shift(@Callback::callbackTrace); |
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die $@ if $@; |
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15
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return @ret if wantarray; |
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15
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return $ret; |
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} |
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sub DELETE |
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0
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0
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{ |
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} |
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# |
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# Storable hooks |
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# |
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# We cannot serialize something containing a pure CODE ref, which is the |
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# case if there's no METHOD attribute in the object. |
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# |
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# However, when Callback is a method call, we can remove the FUNC attribute |
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# and serialize the object: the function address will be recomputed at |
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# retrieve time. |
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# |
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77
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sub STORABLE_freeze { |
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2
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2
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0
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my ($self, $cloning) = @_; |
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2
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return if $cloning; |
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81
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2
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9
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my %copy = %$self; |
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2
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100
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13
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die "cannot store $self since it contains CODE references\n" |
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unless exists $copy{METHOD}; |
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85
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1
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3
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delete $copy{FUNC}; |
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1
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return ("", \%copy); |
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} |
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89
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sub STORABLE_thaw { |
90
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1
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1
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0
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my ($self, $cloning, $x, $copy) = @_; |
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92
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1
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5
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%$self = %$copy; |
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94
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1
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3
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my $method = $self->{METHOD}; |
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1
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2
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my $obj = $self->{ARGS}->[0]; |
96
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1
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5
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my $func = $obj->can($method); |
97
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1
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50
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4
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die("cannot restore $self: can't locate method '$method' on object $obj") |
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unless defined $func; |
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100
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1
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1
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$self->{FUNC} = $func; |
101
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1
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15
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return; |
102
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} |
103
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104
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1; |
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