1 package Catalyst::Stats;
4 use Time::HiRes qw/gettimeofday tv_interval/;
5 use Text::SimpleTable ();
6 use Tree::Simple qw/use_weak_refs/;
7 use Tree::Simple::Visitor::FindByUID;
9 has enable => (is => 'rw', required => 1, default => sub{ 1 });
13 default => sub{ Tree::Simple->new({t => [gettimeofday]}) }
19 default => sub { [ shift->tree ] }
25 return unless $self->enable;
29 $params{comment} = shift || "";
32 die "profile() requires a single comment parameter or a list of name-value pairs; found "
33 . (scalar @_) . " values: " . join(", ", @_);
37 $params{comment} ||= "";
42 my $t = [ gettimeofday ];
43 my $stack = $self->stack;
46 # parent is on stack; search for matching block and splice out
47 for (my $i = $#{$stack}; $i > 0; $i--) {
48 if ($stack->[$i]->getNodeValue->{action} eq $params{end}) {
49 my ($node) = splice(@{$stack}, $i, 1);
50 # Adjust elapsed on partner node
51 my $v = $node->getNodeValue;
52 $v->{elapsed} = tv_interval($v->{t}, $t);
56 # if partner not found, fall through to treat as non-closing call
58 if ($params{parent}) {
59 # parent is explicitly defined
60 $prev = $parent = $self->_get_uid($params{parent});
63 # Find previous node, which is either previous sibling or parent, for ref time.
64 $prev = $parent = $stack->[-1] or return undef;
65 my $n = $parent->getChildCount;
66 $prev = $parent->getChild($n - 1) if $n > 0;
69 my $node = Tree::Simple->new({
70 action => $params{begin} || "",
72 elapsed => tv_interval($prev->getNodeValue->{t}, $t),
73 comment => $params{comment},
75 $node->setUID($params{uid}) if $params{uid};
77 $parent->addChild($node);
78 push(@{$stack}, $node) if $params{begin};
84 return tv_interval(shift->{tree}->getNodeValue->{t});
90 # close any remaining open nodes
91 map { $self->profile(end => $_->getNodeValue->{action}) }
92 (reverse @{ $self->stack })[1 .. $#{$self->stack}];
94 my $t = Text::SimpleTable->new( [ 62, 'Action' ], [ 9, 'Time' ] );
96 $self->tree->traverse(
99 my $stat = $action->getNodeValue;
100 my @r = ( $action->getDepth,
101 ($stat->{action} || "") .
102 ($stat->{action} && $stat->{comment} ? " " : "") . ($stat->{comment} ? '- ' . $stat->{comment} : ""),
104 $stat->{action} ? 1 : 0,
106 $t->row( ( q{ } x $r[0] ) . $r[1],
107 defined $r[2] ? sprintf("%fs", $r[2]) : '??');
111 return wantarray ? @results : $t->draw;
115 my ($self, $uid) = @_;
117 my $visitor = Tree::Simple::Visitor::FindByUID->new;
118 $visitor->searchForUID($uid);
119 $self->tree->accept($visitor);
120 return $visitor->getResult;
129 Catalyst::Stats - Catalyst Timing Statistics Class
135 $stats->profile($comment);
136 $stats->profile(begin => $block_name, comment =>$comment);
137 $stats->profile(end => $block_name);
138 $elapsed = $stats->elapsed;
139 $report = $stats->report;
145 This module provides the default, simple timing stats collection functionality for Catalyst.
146 If you want something different set C<< MyApp->stats_class >> in your application module,
149 __PACKAGE__->stats_class( "My::Stats" );
151 If you write your own, your stats object is expected to provide the interface described here.
153 Catalyst uses this class to report timings of component actions. You can add
154 profiling points into your own code to get deeper insight. Typical usage might
159 $c->stats->profile(begin => "mysub");
162 $c->stats->profile("starting critical bit");
165 $c->stats->profile("completed first part of critical bit");
168 $c->stats->profile("completed second part of critical bit");
171 $c->stats->profile(end => "mysub");
174 Supposing mysub was called from the action "process" inside a Catalyst
175 Controller called "service", then the reported timings for the above example
176 might look something like this:
178 .----------------------------------------------------------------+-----------.
180 +----------------------------------------------------------------+-----------+
181 | /service/process | 1.327702s |
182 | mysub | 0.555555s |
183 | - starting critical bit | 0.111111s |
184 | - completed first part of critical bit | 0.333333s |
185 | - completed second part of critical bit | 0.111000s |
187 '----------------------------------------------------------------+-----------'
189 which means mysub took 0.555555s overall, it took 0.111111s to reach the
190 critical bit, the first part of the critical bit took 0.333333s, and the second
200 $stats = Catalyst::Stats->new;
207 Enable or disable stats collection. By default, stats are enabled after object creation.
211 $stats->profile($comment);
212 $stats->profile(begin => $block_name, comment =>$comment);
213 $stats->profile(end => $block_name);
215 Marks a profiling point. These can appear in pairs, to time the block of code
216 between the begin/end pairs, or by themselves, in which case the time of
217 execution to the previous profiling point will be reported.
219 The argument may be either a single comment string or a list of name-value
220 pairs. Thus the following are equivalent:
222 $stats->profile($comment);
223 $stats->profile(comment => $comment);
225 The following key names/values may be used:
229 =item * begin => ACTION
231 Marks the beginning of a block. The value is used in the description in the
234 =item * end => ACTION
236 Marks the end of the block. The name given must match a previous 'begin'.
237 Correct nesting is recommended, although this module is tolerant of blocks that
238 are not correctly nested, and the reported timings should accurately reflect the
239 time taken to execute the block whether properly nested or not.
241 =item * comment => COMMENT
243 Comment string; use this to describe the profiling point. It is combined with
244 the block action (if any) in the timing report description field.
248 Assign a predefined unique ID. This is useful if, for whatever reason, you wish
249 to relate a profiling point to a different parent than in the natural execution
252 =item * parent => UID
254 Explicitly relate the profiling point back to the parent with the specified UID.
255 The profiling point will be ignored if the UID has not been previously defined.
259 Returns the UID of the current point in the profile tree. The UID is
260 automatically assigned if not explicitly given.
264 $elapsed = $stats->elapsed
266 Get the total elapsed time (in seconds) since the object was created.
270 print $stats->report ."\n";
271 $report = $stats->report;
272 @report = $stats->report;
274 In scalar context, generates a textual report. In array context, returns the
275 array of results where each row comprises:
277 [ depth, description, time, rollup ]
279 The depth is the calling stack level of the profiling point.
281 The description is a combination of the block name and comment.
283 The time reported for each block is the total execution time for the block, and
284 the time associated with each intermediate profiling point is the elapsed time
285 from the previous profiling point.
287 The 'rollup' flag indicates whether the reported time is the rolled up time for
288 the block, or the elapsed time from the previous profiling point.
301 This program is free software, you can redistribute it and/or modify
302 it under the same terms as Perl itself.
306 __PACKAGE__->meta->make_immutable;