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package Mojo::Promise::Role::Any; |
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use Mojo::Base '-role'; |
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use strict; |
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our $VERSION = '1.002'; |
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=encoding utf8 |
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=head1 NAME |
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Mojo::Promise::Role::Any - Fulfill with the first fulfilled promise |
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=head1 SYNOPSIS |
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use Mojo::Promise; |
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my $any_promise = Mojo::Promise |
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->with_roles( '+Any' ) |
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->any( @promises ); |
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=head1 DESCRIPTION |
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Make a new promise that fulfills with the first fulfilled promise, and |
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rejects otherwise. The result is a flat list of the arguments for the |
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fulfilled promise (and not an anonymous array of values). |
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This should be the Perl expression of the same idea in bluebirdjs |
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(L). |
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This is handy, for instance, for asking for several servers to provide |
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the same resource and taking the first one that responds. |
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=over 4 |
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=item any( @promises ) |
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Takes a lists of promises (or thenables) and returns another promise |
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that fulfills when any promise fulfills (and it ignores the |
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others after that). |
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If none of the promises fulfill, the any promise rejects. |
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If you pass no promises, the any promise rejects. |
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=cut |
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sub any { |
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my( $self, @promises ) = @_; |
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my $any = $self->new; |
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$_->then( sub { $any->resolve( @_ ) } ) foreach @promises; |
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return @promises ? $any : $any->reject; |
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} |
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=back |
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=head1 SEE ALSO |
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L, L, L |
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L |
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=head1 SOURCE AVAILABILITY |
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This source is in Github: |
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https://github.com/briandfoy/mojo-promise-role-higherorder |
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=head1 AUTHOR |
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brian d foy, C<< >> |
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=head1 COPYRIGHT AND LICENSE |
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Copyright (c) 2018, brian d foy, All Rights Reserved. |
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You may redistribute this under the terms of the Artistic License 2.0. |
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=cut |
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1; |