1 package Catalyst::Stats;
4 use Time::HiRes qw/gettimeofday tv_interval/;
5 use Text::SimpleTable ();
7 use Tree::Simple qw/use_weak_refs/;
8 use Tree::Simple::Visitor::FindByUID;
10 use namespace::clean -except => 'meta';
12 has enable => (is => 'rw', required => 1, default => sub{ 1 });
16 default => sub{ Tree::Simple->new({t => [gettimeofday]}) },
17 handles => [qw/ accept traverse /],
23 default => sub { [ shift->tree ] }
29 return unless $self->enable;
33 $params{comment} = shift || "";
36 die "profile() requires a single comment parameter or a list of name-value pairs; found "
37 . (scalar @_) . " values: " . join(", ", @_);
41 $params{comment} ||= "";
46 my $t = [ gettimeofday ];
47 my $stack = $self->stack;
50 # parent is on stack; search for matching block and splice out
51 for (my $i = $#{$stack}; $i > 0; $i--) {
52 if ($stack->[$i]->getNodeValue->{action} eq $params{end}) {
53 my ($node) = splice(@{$stack}, $i, 1);
54 # Adjust elapsed on partner node
55 my $v = $node->getNodeValue;
56 $v->{elapsed} = tv_interval($v->{t}, $t);
60 # if partner not found, fall through to treat as non-closing call
62 if ($params{parent}) {
63 # parent is explicitly defined
64 $prev = $parent = $self->_get_uid($params{parent});
67 # Find previous node, which is either previous sibling or parent, for ref time.
68 $prev = $parent = $stack->[-1] or return undef;
69 my $n = $parent->getChildCount;
70 $prev = $parent->getChild($n - 1) if $n > 0;
73 my $node = Tree::Simple->new({
74 action => $params{begin} || "",
76 elapsed => tv_interval($prev->getNodeValue->{t}, $t),
77 comment => $params{comment},
79 $node->setUID($params{uid}) if $params{uid};
81 $parent->addChild($node);
82 push(@{$stack}, $node) if $params{begin};
88 return @{ shift->{tree}->getNodeValue->{t} };
92 return tv_interval(shift->{tree}->getNodeValue->{t});
98 my $column_width = Catalyst::Utils::term_width() - 9 - 13;
99 my $t = Text::SimpleTable->new( [ $column_width, 'Action' ], [ 9, 'Time' ] );
104 my $stat = $action->getNodeValue;
105 my @r = ( $action->getDepth,
106 ($stat->{action} || "") .
107 ($stat->{action} && $stat->{comment} ? " " : "") . ($stat->{comment} ? '- ' . $stat->{comment} : ""),
109 $stat->{action} ? 1 : 0,
111 # Trim down any times >= 10 to avoid ugly Text::Simple line wrapping
112 my $elapsed = substr(sprintf("%f", $stat->{elapsed}), 0, 8) . "s";
113 $t->row( ( q{ } x $r[0] ) . $r[1],
114 defined $r[2] ? $elapsed : '??');
118 return wantarray ? @results : $t->draw;
122 my ($self, $uid) = @_;
124 my $visitor = Tree::Simple::Visitor::FindByUID->new;
125 $visitor->searchForUID($uid);
126 $self->accept($visitor);
127 return $visitor->getResult;
134 my $stat = $node->getNodeValue;
136 # do we need to fake $stat->{ t } ?
137 if( $stat->{ elapsed } ) {
138 # remove the "s" from elapsed time
139 $stat->{ elapsed } =~ s{s$}{};
142 $self->tree->addChild( @_ );
149 # do we need to fake $stat->{ t } ?
150 if( $stat->{ elapsed } ) {
151 # remove the "s" from elapsed time
152 $stat->{ elapsed } =~ s{s$}{};
155 $self->tree->setNodeValue( @_ );
160 $self->tree->getNodeValue( @_ )->{ t };
163 __PACKAGE__->meta->make_immutable();
171 Catalyst::Stats - Catalyst Timing Statistics Class
177 $stats->profile($comment);
178 $stats->profile(begin => $block_name, comment =>$comment);
179 $stats->profile(end => $block_name);
180 $elapsed = $stats->elapsed;
181 $report = $stats->report;
187 This module provides the default, simple timing stats collection functionality for Catalyst.
188 If you want something different set C<< MyApp->stats_class >> in your application module,
191 __PACKAGE__->stats_class( "My::Stats" );
193 If you write your own, your stats object is expected to provide the interface described here.
195 Catalyst uses this class to report timings of component actions. You can add
196 profiling points into your own code to get deeper insight. Typical usage might
201 $c->stats->profile(begin => "mysub");
204 $c->stats->profile("starting critical bit");
207 $c->stats->profile("completed first part of critical bit");
210 $c->stats->profile("completed second part of critical bit");
213 $c->stats->profile(end => "mysub");
216 Supposing mysub was called from the action "process" inside a Catalyst
217 Controller called "service", then the reported timings for the above example
218 might look something like this:
220 .----------------------------------------------------------------+-----------.
222 +----------------------------------------------------------------+-----------+
223 | /service/process | 1.327702s |
224 | mysub | 0.555555s |
225 | - starting critical bit | 0.111111s |
226 | - completed first part of critical bit | 0.333333s |
227 | - completed second part of critical bit | 0.111000s |
229 '----------------------------------------------------------------+-----------'
231 which means mysub took 0.555555s overall, it took 0.111111s to reach the
232 critical bit, the first part of the critical bit took 0.333333s, and the second
242 $stats = Catalyst::Stats->new;
249 Enable or disable stats collection. By default, stats are enabled after object creation.
253 $stats->profile($comment);
254 $stats->profile(begin => $block_name, comment =>$comment);
255 $stats->profile(end => $block_name);
257 Marks a profiling point. These can appear in pairs, to time the block of code
258 between the begin/end pairs, or by themselves, in which case the time of
259 execution to the previous profiling point will be reported.
261 The argument may be either a single comment string or a list of name-value
262 pairs. Thus the following are equivalent:
264 $stats->profile($comment);
265 $stats->profile(comment => $comment);
267 The following key names/values may be used:
271 =item * begin => ACTION
273 Marks the beginning of a block. The value is used in the description in the
276 =item * end => ACTION
278 Marks the end of the block. The name given must match a previous 'begin'.
279 Correct nesting is recommended, although this module is tolerant of blocks that
280 are not correctly nested, and the reported timings should accurately reflect the
281 time taken to execute the block whether properly nested or not.
283 =item * comment => COMMENT
285 Comment string; use this to describe the profiling point. It is combined with
286 the block action (if any) in the timing report description field.
290 Assign a predefined unique ID. This is useful if, for whatever reason, you wish
291 to relate a profiling point to a different parent than in the natural execution
294 =item * parent => UID
296 Explicitly relate the profiling point back to the parent with the specified UID.
297 The profiling point will be ignored if the UID has not been previously defined.
301 Returns the UID of the current point in the profile tree. The UID is
302 automatically assigned if not explicitly given.
306 ($seconds, $microseconds) = $stats->created;
308 Returns the time the object was created, in C<gettimeofday> format, with
309 Unix epoch seconds followed by microseconds.
313 $elapsed = $stats->elapsed
315 Get the total elapsed time (in seconds) since the object was created.
319 print $stats->report ."\n";
320 $report = $stats->report;
321 @report = $stats->report;
323 In scalar context, generates a textual report. In array context, returns the
324 array of results where each row comprises:
326 [ depth, description, time, rollup ]
328 The depth is the calling stack level of the profiling point.
330 The description is a combination of the block name and comment.
332 The time reported for each block is the total execution time for the block, and
333 the time associated with each intermediate profiling point is the elapsed time
334 from the previous profiling point.
336 The 'rollup' flag indicates whether the reported time is the rolled up time for
337 the block, or the elapsed time from the previous profiling point.
339 =head1 COMPATIBILITY METHODS
341 Some components might expect the stats object to be a regular Tree::Simple object.
342 We've added some compatibility methods to handle this scenario:
360 Catalyst Contributors, see Catalyst.pm
364 This library is free software. You can redistribute it and/or modify
365 it under the same terms as Perl itself.
369 __PACKAGE__->meta->make_immutable;