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# License and documentation are after __END__. |
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# This is prototype code. It rummages around in its base class' |
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# namespace for constants, among other unsavory things. |
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# Artur Bergman suggests keeping a static Message object in the |
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# Session itself, and reusing that instead of building and destroying |
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# messages each time. That could be a little faster. |
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package POE::Session::MessageBased; |
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use warnings; |
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use strict; |
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use vars qw($VERSION); |
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$VERSION = '0.111'; |
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use POE; |
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6022
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use base qw(POE::Session); |
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use POSIX qw(ENOSYS); |
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sub _invoke_state { |
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5018
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my ($self, $source_session, $state, $etc, $file, $line) = @_; |
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# Trace the state invocation if tracing is enabled. |
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if ($self->[POE::Session::SE_OPTIONS]->{+POE::Session::OPT_TRACE}) { |
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warn( |
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$POE::Kernel::poe_kernel->ID_session_to_id($self), |
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" -> $state (from $file at $line)\n" |
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); |
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} |
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# The desired destination state doesn't exist in this session. |
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# Attempt to redirect the state transition to _default. |
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unless (exists $self->[POE::Session::SE_STATES]->{$state}) { |
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# There's no _default either; redirection's not happening today. |
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# Drop the state transition event on the floor, and optionally |
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# make some noise about it. |
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unless ( |
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exists |
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$self->[POE::Session::SE_STATES]->{+POE::Session::EN_DEFAULT} |
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) { |
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$! = ENOSYS; |
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if ($self->[POE::Session::SE_OPTIONS]->{+POE::Session::OPT_DEFAULT}) { |
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warn( |
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"a '$state' state was sent from $file at $line to session ", |
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$POE::Kernel::poe_kernel->ID_session_to_id($self), |
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", but session ", |
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$POE::Kernel::poe_kernel->ID_session_to_id($self), |
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" has neither that state nor a _default state to handle it\n" |
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); |
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} |
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return undef; |
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} |
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# If we get this far, then there's a _default state to redirect |
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# the transition to. Trace the redirection. |
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if ($self->[POE::Session::SE_OPTIONS]->{+POE::Session::OPT_TRACE}) { |
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warn( |
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$POE::Kernel::poe_kernel->ID_session_to_id($self), |
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" -> $state redirected to _default\n" |
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); |
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} |
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# Transmogrify the original state transition into a corresponding |
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# _default invocation. |
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$etc = [ $state, $etc ]; |
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$state = POE::Session::EN_DEFAULT; |
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} |
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# If we get this far, then the state can be invoked. So invoke it |
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# already! |
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80
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# Inline states are invoked this way. |
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100
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if (ref($self->[POE::Session::SE_STATES]->{$state}) eq 'CODE') { |
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my $message = POE::Session::Message->new( |
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undef, # object |
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$self, # session |
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$POE::Kernel::poe_kernel, # kernel |
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$self->[POE::Session::SE_NAMESPACE], # heap |
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$state, # state |
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$source_session, # sender |
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undef, # unused #6 |
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$file, # caller file name |
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$line, # caller file line |
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$etc # args |
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); |
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return $self->[POE::Session::SE_STATES]->{$state}->($message, @$etc); |
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} |
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# Package and object states are invoked this way. |
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101
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my ($object, $method) = @{$self->[POE::Session::SE_STATES]->{$state}}; |
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102
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my $message = POE::Session::Message->new( |
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$object, # object |
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$self, # session |
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$POE::Kernel::poe_kernel, # kernel |
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$self->[POE::Session::SE_NAMESPACE], # heap |
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$state, # state |
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$source_session, # sender |
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undef, # unused #6 |
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$file, # caller file name |
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$line, # caller file line |
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$etc # args |
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); |
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115
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# Package/object are implied. |
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return $object->$method($message, @$etc); |
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} |
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119
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package POE::Session::Message; |
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use POE::Session; |
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123
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sub new { |
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my $class = shift; |
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my $self = bless [ @_ ], $class; |
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return $self; |
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} |
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129
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sub object { $_[0]->[OBJECT] } |
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sub session { $_[0]->[SESSION] } |
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sub kernel { $_[0]->[KERNEL] } |
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sub heap { $_[0]->[HEAP] } |
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sub state { $_[0]->[STATE] } |
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sub sender { $_[0]->[SENDER] } |
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sub caller_file { $_[0]->[CALLER_FILE] } |
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sub caller_line { $_[0]->[CALLER_LINE] } |
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sub args { @{$_[0]->[ARG0]} } |
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1; |
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__END__ |