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.\" ========================================================================
.\"
.IX Title "TAP::Parser::Scheduler 3perl"
.TH TAP::Parser::Scheduler 3perl "2021-09-24" "perl v5.32.1" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
TAP::Parser::Scheduler \- Schedule tests during parallel testing
.SH "VERSION"
.IX Header "VERSION"
Version 3.42
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    use TAP::Parser::Scheduler;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
.SH "METHODS"
.IX Header "METHODS"
.SS "Class Methods"
.IX Subsection "Class Methods"
\fI\f(CI\*(C`new\*(C'\fI\fR
.IX Subsection "new"
.PP
.Vb 5
\&    my $sched = TAP::Parser::Scheduler\->new(tests => \e@tests);
\&    my $sched = TAP::Parser::Scheduler\->new(
\&        tests => [ [\*(Aqt/test_name.t\*(Aq,\*(AqTest Description\*(Aq], ... ],
\&        rules => \e%rules,
\&    );
.Ve
.PP
Given 'tests' and optional 'rules' as input, returns a new
\&\f(CW\*(C`TAP::Parser::Scheduler\*(C'\fR object.  Each member of \f(CW@tests\fR should be either a
a test file name, or a two element arrayref, where the first element is a test
file name, and the second element is a test description. By default, we'll use
the test name as the description.
.PP
The optional \f(CW\*(C`rules\*(C'\fR attribute provides direction on which tests should be run
in parallel and which should be run sequentially. If no rule data structure is
provided, a default data structure is used which makes every test eligible to
be run in parallel:
.PP
.Vb 1
\&    { par => \*(Aq**\*(Aq },
.Ve
.PP
The rules data structure is documented more in the next section.
.SS "Rules data structure"
.IX Subsection "Rules data structure"
The "\f(CW\*(C`rules\*(C'\fR\*(L" data structure is the the heart of the scheduler. It allows you
to express simple rules like \*(R"run all tests in sequence\*(L" or \*(R"run all tests in
parallel except these five tests.". However, the rules structure also supports
glob-style pattern matching and recursive definitions, so you can also express
arbitarily complicated patterns.
.PP
The rule must only have one top level key: either 'par' for \*(L"parallel\*(R" or 'seq'
for \*(L"sequence\*(R".
.PP
Values must be either strings with possible glob-style matching, or arrayrefs
of strings or hashrefs which follow this pattern recursively.
.PP
Every element in an arrayref directly below a 'par' key is eligible to be run
in parallel, while vavalues directly below a 'seq' key must be run in sequence.
.PP
\fIRules examples\fR
.IX Subsection "Rules examples"
.PP
Here are some examples:
.PP
.Vb 2
\&    # All tests be run in parallel (the default rule)
\&    { par => \*(Aq**\*(Aq },
\&
\&    # Run all tests in sequence, except those starting with "p"
\&    { par => \*(Aqt/p*.t\*(Aq },
\&
\&    # Run all tests in parallel, except those starting with "p"
\&    {
\&        seq => [
\&                  { seq => \*(Aqt/p*.t\*(Aq },
\&                  { par => \*(Aq**\*(Aq     },
\&               ],
\&    }
\&
\&    # Run some  startup tests in sequence, then some parallel tests then some
\&    # teardown tests in sequence.
\&    {
\&        seq => [
\&            { seq => \*(Aqt/startup/*.t\*(Aq },
\&            { par => [\*(Aqt/a/*.t\*(Aq,\*(Aqt/b/*.t\*(Aq,\*(Aqt/c/*.t\*(Aq], }
\&            { seq => \*(Aqt/shutdown/*.t\*(Aq },
\&        ],
\&    },
.Ve
.PP
\fIRules resolution\fR
.IX Subsection "Rules resolution"
.IP "\(bu" 4
By default, all tests are eligible to be run in parallel. Specifying any of your own rules removes this one.
.IP "\(bu" 4
\&\*(L"First match wins\*(R". The first rule that matches a test will be the one that applies.
.IP "\(bu" 4
Any test which does not match a rule will be run in sequence at the end of the run.
.IP "\(bu" 4
The existence of a rule does not imply selecting a test. You must still specify the tests to run.
.IP "\(bu" 4
Specifying a rule to allow tests to run in parallel does not make the run in parallel. You still need specify the number of parallel \f(CW\*(C`jobs\*(C'\fR in your Harness object.
.PP
\fIGlob-style pattern matching for rules\fR
.IX Subsection "Glob-style pattern matching for rules"
.PP
We implement our own glob-style pattern matching. Here are the patterns it supports:
.PP
.Vb 5
\&    ** is any number of characters, including /, within a pathname
\&    * is zero or more characters within a filename/directory name
\&    ? is exactly one character within a filename/directory name
\&    {foo,bar,baz} is any of foo, bar or baz.
\&    \e is an escape character
.Ve
.SS "Instance Methods"
.IX Subsection "Instance Methods"
\fI\f(CI\*(C`get_all\*(C'\fI\fR
.IX Subsection "get_all"
.PP
Get a list of all remaining tests.
.PP
\fI\f(CI\*(C`get_job\*(C'\fI\fR
.IX Subsection "get_job"
.PP
Return the next available job as TAP::Parser::Scheduler::Job object or
\&\f(CW\*(C`undef\*(C'\fR if none are available. Returns a TAP::Parser::Scheduler::Spinner if
the scheduler still has pending jobs but none are available to run right now.
.PP
\fI\f(CI\*(C`as_string\*(C'\fI\fR
.IX Subsection "as_string"
.PP
Return a human readable representation of the scheduling tree.
For example:
.PP
.Vb 3
\&    my @tests = (qw{
\&        t/startup/foo.t 
\&        t/shutdown/foo.t
\&    
\&        t/a/foo.t t/b/foo.t t/c/foo.t t/d/foo.t
\&    });
\&    my $sched = TAP::Parser::Scheduler\->new(
\&        tests => \e@tests,
\&        rules => {
\&            seq => [
\&                { seq => \*(Aqt/startup/*.t\*(Aq },
\&                { par => [\*(Aqt/a/*.t\*(Aq,\*(Aqt/b/*.t\*(Aq,\*(Aqt/c/*.t\*(Aq] },
\&                { seq => \*(Aqt/shutdown/*.t\*(Aq },
\&            ],
\&        },
\&    );
.Ve
.PP
Produces:
.PP
.Vb 10
\&    par:
\&      seq:
\&        par:
\&          seq:
\&            par:
\&              seq:
\&                \*(Aqt/startup/foo.t\*(Aq
\&            par:
\&              seq:
\&                \*(Aqt/a/foo.t\*(Aq
\&              seq:
\&                \*(Aqt/b/foo.t\*(Aq
\&              seq:
\&                \*(Aqt/c/foo.t\*(Aq
\&            par:
\&              seq:
\&                \*(Aqt/shutdown/foo.t\*(Aq
\&        \*(Aqt/d/foo.t\*(Aq
.Ve