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package EventStore::Tiny::EventStream; |
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use strict; |
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use warnings; |
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use Class::Tiny { |
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events => sub {[]}, |
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}; |
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sub add_event { |
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my ($self, $event) = @_; |
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# Append event to internal list |
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push @{$self->events}, $event; |
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# Done |
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return $event; |
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} |
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sub size { |
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my $self = shift; |
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return scalar @{$self->events}; |
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} |
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sub first_timestamp { |
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my $self = shift; |
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return unless @{$self->events}; |
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return $self->events->[0]->timestamp; |
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} |
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sub last_timestamp { |
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my $self = shift; |
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return unless @{$self->events}; |
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return $self->events->[$self->size - 1]->timestamp; |
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} |
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sub apply_to { |
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my ($self, $state, $logger) = @_; |
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# Start with empty state by default |
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$state = {} unless defined $state; |
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# Apply all events |
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$_->apply_to($state, $logger) for @{$self->events}; |
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# Done |
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return $state; |
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} |
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sub substream { |
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my ($self, $selector) = @_; |
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# Default selector: take everything |
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$selector = sub {1} unless defined $selector; |
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# Filter events |
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my @filtered = grep {$selector->($_)} @{$self->events}; |
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# Build new sub stream |
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return EventStore::Tiny::EventStream->new(events => \@filtered); |
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} |
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sub before { |
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my ($self, $timestamp) = @_; |
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# All events until the given timestamp (including) |
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return $self->substream(sub {$_->timestamp <= $timestamp}); |
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} |
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sub after { |
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my ($self, $timestamp) = @_; |
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# All events after the given timestamp (excluding) |
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return $self->substream(sub {$_->timestamp > $timestamp}); |
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9731
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} |
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1; |
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=pod |
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=encoding utf-8 |
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=head1 NAME |
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EventStore::Tiny::EventStream |
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=head1 REFERENCE |
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EventStore::Tiny::Stream implements the following attributes and methods. |
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=head2 events |
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my $event17 = $stream->events->[16]; |
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Internal list representation (arrayref) of all events of this stream. |
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=head2 add_event |
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$stream->add_event($event); |
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Adds an event to the stream. |
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=head2 size |
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my $event_count = $stream->size; |
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Returns the number of events in this stream. |
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=head2 first_timestamp |
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my $start_ts = $stream->first_timestamp; |
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Returns the timestamp of the first event of this stream. |
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=head2 last_timestamp |
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my $end_ts = $stream->last_timestamp; |
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Returns the timestamp of the last event of this stream. |
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=head2 apply_to |
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my $state = $stream->apply_to(\%state); |
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Applies the whole stream (all events one after another) to a given state (by default an empty hash). The state is changed by side-effect but is also returned. |
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=head2 substream |
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my $filtered = $stream->substream(sub { |
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my $event = shift; |
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return we_want($event); |
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}); |
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Creates a substream using a given filter. All events the given subref returns true for are selected for this substream. |
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=head2 before |
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my $pre_stream = $stream->before($timestamp); |
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Returns a substream with all events before or at the same time of a given timestamp. |
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=head2 after |
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my $post_stream = $stream->after($timestamp); |
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Returns a substream with all events after a given timestamp. |
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=head1 SEE ALSO |
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150
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L |
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152
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=head1 COPYRIGHT AND LICENSE |
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154
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Copyright (c) 2018 Mirko Westermeier (mail: mirko@westermeier.de) |
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Released under the MIT License (see LICENSE.txt for details). |
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=cut |