anyevent::callback(3pm) [debian man page]
AnyEvent::Callback(3pm) User Contributed Perl Documentation AnyEvent::Callback(3pm) NAME
AnyEvent::Callback - callback aggregator for AnyEvent watchers. SYNOPSIS
use AnyEvent::Callback; # usually watchers are looked as: AE::something @args, sub { ... }; AE::something @args, sub { ... }, # result sub { ... }; # error use AnyEvent::Callback; AE::something @args, CB { ... }; AE::something @args, CB sub { ... }, # result sub { ... }; # error AE::something @args, CB sub { ... }, # result sub { ... }, # error sub { ... }; # anyway callback Callback hierarchy my $cbchild = $cb->CB(sub { ... }); ... $cbchild->error('error'); # will call $cb->error('error'); Inside Your callback You can: sub my_watcher { my $cb = pop; my @args = @_; # ... $cb->error( @error ); # error callback will be called # or: $cb->( $value ); # result callback will be called } Callbacks stack my $cbs = CBS; for (1 .. $n) { AE::something @args, $cbs->cb; } $cbs->wait(sub { for (@_) { if ($_->is_error) { # handle one error my @err = $_->errors; # or: my $errstr = $_->errstr; } else { # results my @res = $_->results; } } }); DESCRIPTION
The module allows You to create callback's hierarchy. Also the module groups error and result callbacks into one object. Also the module checks if one callback was called by watcher or not. If a watcher doesn't call result or error callback, error callback will be called automatically. Also the module checks if a callback was called reentrant. In the case the module will complain (using "carp" in Carp). If a watcher touches error callback and if superior didn't define error callback, the module will call error callback upwards hierarchy. Example: AE::something @args, CB &my_watcher, &on_error; sub on_error { } sub my_watcher { my $cb = pop; ... the_other_watcher $cb->CB( sub { # error callback wasn't defined my $cb = pop; ... yet_another_watcher1 $cb->CB( sub { my $cb = pop; ... $cb->( 123 ); # upwards callback }); yet_another_watcher2 $cb->CB( sub { my $cb = pop; ... $cb->error( 456 ); # on_error will be called }); }); } METHODS
'CODE' (overloaded fake method) $cb->( ... ); You can use the object as usually CODEREF. CB Creates new callback object that have binding on parent callback. my $new_cb = $cb->CB(sub { ... }); # the cb doesn't catch errors my $new_cb = CB(sub { ... }, sub { ... }); # the cb catches errors my $new_cb = $cb->CB(sub { ... }, sub { ... }); # the same error Calls error callback. If the object has no registered error callbacks, parent object's error callback will be called. $cb->error('WTF?'); COPYRIGHT AND LICENCE
Copyright (C) 2012 by Dmitry E. Oboukhov This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-06-30 AnyEvent::Callback(3pm)
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README(3pm) User Contributed Perl Documentation README(3pm) NAME
AnyEvent::Callback - callback aggregator for AnyEvent watchers. SYNOPSIS
use AnyEvent::Callback; # usually watchers are looked as: AE::something @args, sub { ... }; AE::something @args, sub { ... }, # result sub { ... }; # error use AnyEvent::Callback; AE::something @args, CB { ... }; AE::something @args, CB sub { ... }, # result sub { ... }; # error AE::something @args, CB sub { ... }, # result sub { ... }, # error sub { ... }; # anyway callback Callback hierarchy my $cbchild = $cb->CB(sub { ... }); ... $cbchild->error('error'); # will call $cb->error('error'); Inside Your callback You can: sub my_watcher { my $cb = pop; my @args = @_; # ... $cb->error( @error ); # error callback will be called # or: $cb->( $value ); # result callback will be called } Callbacks stack my $cbs = CBS; for (1 .. $n) { AE::something @args, $cbs->cb; } $cbs->wait(sub { for (@_) { if ($_->is_error) { # handle one error my @err = $_->errors; # or: my $errstr = $_->errstr; } else { # results my @res = $_->results; } } }); DESCRIPTION
The module allows You to create callback's hierarchy. Also the module groups error and result callbacks into one object. Also the module checks if one callback was called by watcher or not. If a watcher doesn't call result or error callback, error callback will be called automatically. Also the module checks if a callback was called reentrant. In the case the module will complain (using "carp" in Carp). If a watcher touches error callback and if superior didn't define error callback, the module will call error callback upwards hierarchy. Example: AE::something @args, CB &my_watcher, &on_error; sub on_error { } sub my_watcher { my $cb = pop; ... the_other_watcher $cb->CB( sub { # error callback wasn't defined my $cb = pop; ... yet_another_watcher1 $cb->CB( sub { my $cb = pop; ... $cb->( 123 ); # upwards callback }); yet_another_watcher2 $cb->CB( sub { my $cb = pop; ... $cb->error( 456 ); # on_error will be called }); }); } METHODS
'CODE' (overloaded fake method) $cb->( ... ); You can use the object as usually CODEREF. CB Creates new callback object that have binding on parent callback. my $new_cb = $cb->CB(sub { ... }); # the cb doesn't catch errors my $new_cb = CB(sub { ... }, sub { ... }); # the cb catches errors my $new_cb = $cb->CB(sub { ... }, sub { ... }); # the same error Calls error callback. If the object has no registered error callbacks, parent object's error callback will be called. $cb->error('WTF?'); COPYRIGHT AND LICENCE
Copyright (C) 2012 by Dmitry E. Oboukhov This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-06-30 README(3pm)