1 package DBIx::Class::DeploymentHandler::DeployMethod::SQL::Translator;
4 # ABSTRACT: Manage your SQL and Perl migrations in nicely laid out directories
7 use Carp qw( carp croak );
8 use DBIx::Class::DeploymentHandler::LogImporter qw(:log :dlog);
14 require SQL::Translator::Diff;
16 require DBIx::Class::Storage; # loaded for type constraint
17 use DBIx::Class::DeploymentHandler::Types;
19 use Path::Class qw(file dir);
21 with 'DBIx::Class::DeploymentHandler::HandlesDeploy';
29 has force_overwrite => (
41 isa => 'DBIx::Class::Storage',
48 my $s = $self->schema->storage;
49 $s->_determine_driver;
53 has sql_translator_args => (
56 default => sub { {} },
58 has script_directory => (
67 isa => 'DBIx::Class::DeploymentHandler::Databases',
69 default => sub { [qw( MySQL SQLite PostgreSQL )] },
78 has schema_version => (
84 # this will probably never get called as the DBICDH
85 # will be passing down a schema_version normally, which
86 # is built the same way, but we leave this in place
87 sub _build_schema_version {
89 $self->schema->schema_version
92 sub __ddl_consume_with_prefix {
93 my ($self, $type, $versions, $prefix) = @_;
94 my $base_dir = $self->script_directory;
96 my $main = dir( $base_dir, $type );
98 dir( $base_dir, '_common', $prefix, join q(-), @{$versions} );
101 dir( $base_dir, '_common', $prefix, '_any' );
105 $dir = dir($main, $prefix, join q(-), @{$versions})
107 if ($self->ignore_ddl) {
110 croak "$main does not exist; please write/generate some SQL"
113 my $dir_any = dir($main, $prefix, '_any');
117 opendir my($dh), $dir;
119 map { $_ => "$dir/$_" }
120 grep { /\.(?:sql|pl|sql-\w+)$/ && -f "$dir/$_" }
124 die $_ unless $self->ignore_ddl;
126 for my $dirname (grep { -d $_ } $common, $common_any, $dir_any) {
127 opendir my($dh), $dirname;
128 for my $filename (grep { /\.(?:sql|pl)$/ && -f file($dirname,$_) } readdir $dh) {
129 unless ($files{$filename}) {
130 $files{$filename} = file($dirname,$filename);
136 return [@files{sort keys %files}]
139 sub _ddl_initialize_consume_filenames {
140 my ($self, $type, $version) = @_;
141 $self->__ddl_consume_with_prefix($type, [ $version ], 'initialize')
144 sub _ddl_schema_consume_filenames {
145 my ($self, $type, $version) = @_;
146 $self->__ddl_consume_with_prefix($type, [ $version ], 'deploy')
149 sub _ddl_protoschema_deploy_consume_filenames {
150 my ($self, $version) = @_;
151 my $base_dir = $self->script_directory;
153 my $dir = dir( $base_dir, '_source', 'deploy', $version);
154 return [] unless -d $dir;
156 opendir my($dh), $dir;
157 my %files = map { $_ => "$dir/$_" } grep { /\.yml$/ && -f "$dir/$_" } readdir $dh;
160 return [@files{sort keys %files}]
163 sub _ddl_protoschema_upgrade_consume_filenames {
164 my ($self, $versions) = @_;
165 my $base_dir = $self->script_directory;
167 my $dir = dir( $base_dir, '_preprocess_schema', 'upgrade', join q(-), @{$versions});
169 return [] unless -d $dir;
171 opendir my($dh), $dir;
172 my %files = map { $_ => "$dir/$_" } grep { /\.pl$/ && -f "$dir/$_" } readdir $dh;
175 return [@files{sort keys %files}]
178 sub _ddl_protoschema_downgrade_consume_filenames {
179 my ($self, $versions) = @_;
180 my $base_dir = $self->script_directory;
182 my $dir = dir( $base_dir, '_preprocess_schema', 'downgrade', join q(-), @{$versions});
184 return [] unless -d $dir;
186 opendir my($dh), $dir;
187 my %files = map { $_ => "$dir/$_" } grep { /\.pl$/ && -f "$dir/$_" } readdir $dh;
190 return [@files{sort keys %files}]
193 sub _ddl_protoschema_produce_filename {
194 my ($self, $version) = @_;
195 my $dirname = dir( $self->script_directory, '_source', 'deploy', $version );
196 $dirname->mkpath unless -d $dirname;
198 return "" . file( $dirname, '001-auto.yml' );
201 sub _ddl_schema_produce_filename {
202 my ($self, $type, $version) = @_;
203 my $dirname = dir( $self->script_directory, $type, 'deploy', $version );
204 $dirname->mkpath unless -d $dirname;
206 return "" . file( $dirname, '001-auto.sql' );
209 sub _ddl_schema_upgrade_consume_filenames {
210 my ($self, $type, $versions) = @_;
211 $self->__ddl_consume_with_prefix($type, $versions, 'upgrade')
214 sub _ddl_schema_downgrade_consume_filenames {
215 my ($self, $type, $versions) = @_;
216 $self->__ddl_consume_with_prefix($type, $versions, 'downgrade')
219 sub _ddl_schema_upgrade_produce_filename {
220 my ($self, $type, $versions) = @_;
221 my $dir = $self->script_directory;
223 my $dirname = dir( $dir, $type, 'upgrade', join q(-), @{$versions});
224 $dirname->mkpath unless -d $dirname;
226 return "" . file( $dirname, '001-auto.sql' );
229 sub _ddl_schema_downgrade_produce_filename {
230 my ($self, $type, $versions, $dir) = @_;
231 my $dirname = dir( $dir, $type, 'downgrade', join q(-), @{$versions} );
232 $dirname->mkpath unless -d $dirname;
234 return "" . file( $dirname, '001-auto.sql');
238 my ($self, $sql) = @_;
239 my $storage = $self->storage;
241 $sql = [ _split_sql_chunk( @$sql ) ];
243 Dlog_trace { "Running SQL $_" } $sql;
244 foreach my $line (@{$sql}) {
245 $storage->_query_start($line);
246 # the whole reason we do this is so that we can see the line that was run
248 $storage->dbh_do (sub { $_[1]->do($line) });
251 die "$_ (running line '$line')"
253 $storage->_query_end($line);
255 return join "\n", @$sql
258 # split a chunk o' SQL into statements
259 sub _split_sql_chunk {
260 my @sql = map { split /;\n/, $_ } @_;
264 s/^(?:BEGIN|BEGIN TRANSACTION|COMMIT).*//mgi;
283 my ($self, $filename) = @_;
284 log_debug { "Running SQL from $filename" };
285 return $self->_run_sql_array($self->_read_sql_file($filename));
291 my $_package = $_file;
292 $_package =~ s/([^A-Za-z0-9_])/sprintf("_%2x", ord($1))/eg;
294 my $fn = eval sprintf <<'END_EVAL', $_package;
295 package DBICDH::Sandbox::%s;
298 $app ||= require $_file;
299 if ( !$app && ( my $error = $@ || $! )) { die $error; }
306 croak "$_file should define an anonymous sub that takes a schema but it didn't!"
307 unless ref $fn && ref $fn eq 'CODE';
313 my ($self, $filename, $versions) = @_;
314 log_debug { "Running Perl from $filename" };
316 my $fn = _load_sandbox($filename);
318 Dlog_trace { "Running Perl $_" } $fn;
320 $fn->($self->schema, $versions)
324 my ( $self, $code ) = @_;
325 return $code->() unless $self->txn_wrap;
327 my $guard = $self->schema->txn_scope_guard;
329 return preserve_context { $code->() } after => sub { $guard->commit };
332 sub _run_sql_and_perl {
333 my ($self, $filenames, $sql_to_run, $versions) = @_;
334 my @files = @{$filenames};
336 $self->_run_sql_array($sql_to_run) if $self->ignore_ddl;
338 my $sql = ($sql_to_run)?join ";\n", @$sql_to_run:'';
340 for my $filename (map file($_), @files) {
341 if ($self->ignore_ddl && $filename->basename =~ /^[^-]*-auto.*\.sql$/) {
343 } elsif ($filename =~ /\.sql$/) {
344 $sql .= $self->_run_sql($filename)
345 } elsif ( $filename =~ /\.pl$/ ) {
346 $self->_run_perl($filename, $versions)
348 croak "A file ($filename) got to deploy that wasn't sql or perl!";
358 my $version = (shift @_ || {})->{version} || $self->schema_version;
359 log_info { "deploying version $version" };
360 my $sqlt_type = $self->storage->sqlt_type;
362 if ($self->ignore_ddl) {
363 $sql = $self->_sql_from_yaml({},
364 '_ddl_protoschema_deploy_consume_filenames', $sqlt_type
367 return $self->_run_sql_and_perl($self->_ddl_schema_consume_filenames(
370 ), $sql, [$version]);
376 my $version = $args->{version} || $self->schema_version;
377 log_info { "initializing version $version" };
378 my $storage_type = $args->{storage_type} || $self->storage->sqlt_type;
380 my @files = @{$self->_ddl_initialize_consume_filenames(
385 for my $filename (@files) {
386 # We ignore sql for now (till I figure out what to do with it)
387 if ( $filename =~ /^(.+)\.pl$/ ) {
388 my $filedata = do { local( @ARGV, $/ ) = $filename; <> };
390 no warnings 'redefine';
391 my $fn = eval "$filedata";
395 croak "$filename failed to compile: $@";
396 } elsif (ref $fn eq 'CODE') {
399 croak "$filename should define an anonymous sub but it didn't!";
402 croak "A file ($filename) got to initialize_scripts that wasn't sql or perl!";
407 sub _sqldiff_from_yaml {
408 my ($self, $from_version, $to_version, $db, $direction) = @_;
409 my $dir = $self->script_directory;
412 ignore_constraint_names => 1,
413 ignore_index_names => 1,
414 %{$self->sql_translator_args}
419 my $prefilename = $self->_ddl_protoschema_produce_filename($from_version, $dir);
421 # should probably be a croak
422 carp("No previous schema file found ($prefilename)")
423 unless -e $prefilename;
425 my $t = SQL::Translator->new({
429 parser => 'SQL::Translator::Parser::YAML',
432 my $out = $t->translate( $prefilename )
435 $source_schema = $t->schema;
437 $source_schema->name( $prefilename )
438 unless $source_schema->name;
443 my $filename = $self->_ddl_protoschema_produce_filename($to_version, $dir);
445 # should probably be a croak
446 carp("No next schema file found ($filename)")
449 my $t = SQL::Translator->new({
453 parser => 'SQL::Translator::Parser::YAML',
456 my $out = $t->translate( $filename )
459 $dest_schema = $t->schema;
461 $dest_schema->name( $filename )
462 unless $dest_schema->name;
465 my $transform_files_method = "_ddl_protoschema_${direction}_consume_filenames";
466 my $transforms = $self->_coderefs_per_files(
467 $self->$transform_files_method([$from_version, $to_version])
469 $_->($source_schema, $dest_schema) for @$transforms;
471 return [SQL::Translator::Diff::schema_diff(
479 my ($self, $sqltargs, $from_file, $db) = @_;
480 my $schema = $self->schema;
481 my $version = $self->schema_version;
485 my $actual_file = $self->$from_file($version);
486 for my $yaml_filename (@{
487 DlogS_trace { "generating SQL from Serialized SQL Files: $_" }
488 (ref $actual_file?$actual_file:[$actual_file])
490 my $sqlt = SQL::Translator->new({
492 parser => 'SQL::Translator::Parser::YAML',
497 push @sql, $sqlt->translate($yaml_filename);
499 carp("Failed to translate to $db, skipping. (" . $sqlt->error . ")");
506 sub _prepare_install {
508 my $sqltargs = { %{$self->sql_translator_args}, %{shift @_} };
509 my $from_file = shift;
511 my $dir = $self->script_directory;
512 my $databases = $self->databases;
513 my $version = $self->schema_version;
515 foreach my $db (@$databases) {
516 my $sql = $self->_sql_from_yaml($sqltargs, $from_file, $db ) or next;
518 my $filename = $self->$to_file($db, $version, $dir);
520 if ($self->force_overwrite) {
521 carp "Overwriting existing DDL file - $filename";
524 die "Cannot overwrite '$filename', either enable force_overwrite or delete it"
527 open my $file, q(>), $filename;
528 print {$file} join ";\n", @$sql;
533 sub _resultsource_install_filename {
534 my ($self, $source_name) = @_;
536 my ($self, $type, $version) = @_;
537 my $dirname = dir( $self->script_directory, $type, 'deploy', $version );
538 $dirname->mkpath unless -d $dirname;
540 return "" . file( $dirname, "001-auto-$source_name.sql" );
544 sub _resultsource_protoschema_filename {
545 my ($self, $source_name) = @_;
547 my ($self, $version) = @_;
548 my $dirname = dir( $self->script_directory, '_source', 'deploy', $version );
549 $dirname->mkpath unless -d $dirname;
551 return "" . file( $dirname, "001-auto-$source_name.yml" );
555 sub install_resultsource {
556 my ($self, $args) = @_;
557 my $source = $args->{result_source}
558 or die 'result_source must be passed to install_resultsource';
559 my $version = $args->{version}
560 or die 'version must be passed to install_resultsource';
561 log_info { 'installing_resultsource ' . $source->source_name . ", version $version" };
562 my $rs_install_file =
563 $self->_resultsource_install_filename($source->source_name);
566 $self->$rs_install_file(
567 $self->storage->sqlt_type,
571 $self->_run_sql_and_perl($files, '', [$version]);
574 sub prepare_resultsource_install {
576 my $source = (shift @_)->{result_source};
577 log_info { 'preparing install for resultsource ' . $source->source_name };
579 my $install_filename = $self->_resultsource_install_filename($source->source_name);
580 my $proto_filename = $self->_resultsource_protoschema_filename($source->source_name);
581 $self->prepare_protoschema({
582 parser_args => { sources => [$source->source_name], }
584 $self->_prepare_install({}, $proto_filename, $install_filename);
588 log_info { 'preparing deploy' };
590 $self->prepare_protoschema({
591 # Exclude __VERSION so that it gets installed separately
592 parser_args => { sources => [grep { $_ ne '__VERSION' } $self->schema->sources], }
593 }, '_ddl_protoschema_produce_filename');
594 $self->_prepare_install({}, '_ddl_protoschema_produce_filename', '_ddl_schema_produce_filename');
597 sub prepare_upgrade {
598 my ($self, $args) = @_;
600 "preparing upgrade from $args->{from_version} to $args->{to_version}"
602 $self->_prepare_changegrade(
603 $args->{from_version}, $args->{to_version}, $args->{version_set}, 'upgrade'
607 sub prepare_downgrade {
608 my ($self, $args) = @_;
610 "preparing downgrade from $args->{from_version} to $args->{to_version}"
612 $self->_prepare_changegrade(
613 $args->{from_version}, $args->{to_version}, $args->{version_set}, 'downgrade'
617 sub _coderefs_per_files {
618 my ($self, $files) = @_;
619 no warnings 'redefine';
620 [map eval do { local( @ARGV, $/ ) = $_; <> }, @$files]
623 sub _prepare_changegrade {
624 my ($self, $from_version, $to_version, $version_set, $direction) = @_;
625 my $schema = $self->schema;
626 my $databases = $self->databases;
627 my $dir = $self->script_directory;
629 my $schema_version = $self->schema_version;
630 my $diff_file_method = "_ddl_schema_${direction}_produce_filename";
631 foreach my $db (@$databases) {
632 my $diff_file = $self->$diff_file_method($db, $version_set, $dir );
634 if ($self->force_overwrite) {
635 carp("Overwriting existing $direction-diff file - $diff_file");
638 die "Cannot overwrite '$diff_file', either enable force_overwrite or delete it"
642 open my $file, q(>), $diff_file;
643 print {$file} join ";\n", @{$self->_sqldiff_from_yaml($from_version, $to_version, $db, $direction)};
649 my ($self, $file) = @_;
652 local $/ = undef; #sluuuuuurp
654 open my $fh, '<', $file;
655 return [ _split_sql_chunk( <$fh> ) ];
658 sub downgrade_single_step {
660 my $version_set = (shift @_)->{version_set};
661 Dlog_info { "downgrade_single_step'ing $_" } $version_set;
663 my $sqlt_type = $self->storage->sqlt_type;
665 if ($self->ignore_ddl) {
666 $sql_to_run = $self->_sqldiff_from_yaml(
667 $version_set->[0], $version_set->[1], $sqlt_type, 'downgrade',
670 my $sql = $self->_run_sql_and_perl($self->_ddl_schema_downgrade_consume_filenames(
673 ), $sql_to_run, $version_set);
678 sub upgrade_single_step {
680 my $version_set = (shift @_)->{version_set};
681 Dlog_info { "upgrade_single_step'ing $_" } $version_set;
683 my $sqlt_type = $self->storage->sqlt_type;
685 if ($self->ignore_ddl) {
686 $sql_to_run = $self->_sqldiff_from_yaml(
687 $version_set->[0], $version_set->[1], $sqlt_type, 'upgrade',
690 my $sql = $self->_run_sql_and_perl($self->_ddl_schema_upgrade_consume_filenames(
693 ), $sql_to_run, $version_set);
697 sub prepare_protoschema {
699 my $sqltargs = { %{$self->sql_translator_args}, %{shift @_} };
702 = $self->$to_file($self->schema_version);
704 # we do this because the code that uses this sets parser args,
705 # so we just need to merge in the package
706 $sqltargs->{parser_args}{package} = $self->schema;
707 my $sqlt = SQL::Translator->new({
708 parser => 'SQL::Translator::Parser::DBIx::Class',
709 producer => 'SQL::Translator::Producer::YAML',
713 my $yml = $sqlt->translate;
715 croak("Failed to translate to YAML: " . $sqlt->error)
719 if ($self->force_overwrite) {
720 carp "Overwriting existing DDL-YML file - $filename";
723 die "Cannot overwrite '$filename', either enable force_overwrite or delete it"
727 open my $file, q(>), $filename;
732 __PACKAGE__->meta->make_immutable;
736 # vim: ts=2 sw=2 expandtab
742 This class is the meat of L<DBIx::Class::DeploymentHandler>. It takes care
743 of generating serialized schemata as well as sql files to move from one
744 version of a schema to the rest. One of the hallmark features of this class
745 is that it allows for multiple sql files for deploy and upgrade, allowing
746 developers to fine tune deployment. In addition it also allows for perl
747 files to be run at any stage of the process.
749 For basic usage see L<DBIx::Class::DeploymentHandler::HandlesDeploy>. What's
750 documented here is extra fun stuff or private methods.
752 =head1 DIRECTORY LAYOUT
754 Arguably this is the best feature of L<DBIx::Class::DeploymentHandler>.
755 It's spiritually based upon L<DBIx::Migration::Directories>, but has a
756 lot of extensions and modifications, so even if you are familiar with it,
757 please read this. I feel like the best way to describe the layout is with
758 the following example:
784 | | `- 002-remove-customers.pl
787 | | `- 002-generate-customers.pl
789 | `- 999-bump-action.pl
796 | |- 001-create_database.pl
797 | `- 002-create_users_and_permissions.pl
805 So basically, the code
809 on an C<SQLite> database that would simply run
810 C<$sql_migration_dir/SQLite/deploy/1/001-auto.sql>. Next,
812 $dm->upgrade_single_step([1,2])
814 would run C<$sql_migration_dir/SQLite/upgrade/1-2/001-auto.sql> followed by
815 C<$sql_migration_dir/_common/upgrade/1-2/002-generate-customers.pl>, and
816 finally punctuated by
817 C<$sql_migration_dir/_common/upgrade/_any/999-bump-action.pl>.
819 C<.pl> files don't have to be in the C<_common> directory, but most of the time
820 they should be, because perl scripts are generally database independent.
822 Note that unlike most steps in the process, C<initialize> will not run SQL, as
823 there may not even be an database at initialize time. It will run perl scripts
824 just like the other steps in the process, but nothing is passed to them.
825 Until people have used this more it will remain freeform, but a recommended use
826 of initialize is to have it prompt for username and password, and then call the
827 appropriate C<< CREATE DATABASE >> commands etc.
829 =head2 Directory Specification
831 The following subdirectories are recognized by this DeployMethod:
835 =item C<_source> This directory can contain the following directories:
839 =item C<deploy> This directory merely contains directories named after schema
840 versions, which in turn contain C<yaml> files that are serialized versions
841 of the schema at that version. These files are not for editing by hand.
845 =item C<_preprocess_schema> This directory can contain the following
850 =item C<downgrade> This directory merely contains directories named after
851 migrations, which are of the form C<$from_version-$to_version>. Inside of
852 these directories you may put Perl scripts which are to return a subref
853 that takes the arguments C<< $from_schema, $to_schema >>, which are
854 L<SQL::Translator::Schema> objects.
856 =item C<upgrade> This directory merely contains directories named after
857 migrations, which are of the form C<$from_version-$to_version>. Inside of
858 these directories you may put Perl scripts which are to return a subref
859 that takes the arguments C<< $from_schema, $to_schema >>, which are
860 L<SQL::Translator::Schema> objects.
864 =item C<$storage_type> This is a set of scripts that gets run depending on what
865 your storage type is. If you are not sure what your storage type is, take a
866 look at the producers listed for L<SQL::Translator>. Also note, C<_common>
867 is a special case. C<_common> will get merged into whatever other files you
868 already have. This directory can contain the following directories itself:
872 =item C<initialize> Gets run before the C<deploy> is C<deploy>ed. Has the
873 same structure as the C<deploy> subdirectory as well; that is, it has a
874 directory for each schema version. Unlike C<deploy>, C<upgrade>, and C<downgrade>
875 though, it can only run C<.pl> files, and the coderef in the perl files get
876 no arguments passed to them.
878 =item C<deploy> Gets run when the schema is C<deploy>ed. Structure is a
879 directory per schema version, and then files are merged with C<_common> and run
880 in filename order. C<.sql> files are merely run, as expected. C<.pl> files are
881 run according to L</PERL SCRIPTS>.
883 =item C<upgrade> Gets run when the schema is C<upgrade>d. Structure is a directory
884 per upgrade step, (for example, C<1-2> for upgrading from version 1 to version
885 2,) and then files are merged with C<_common> and run in filename order.
886 C<.sql> files are merely run, as expected. C<.pl> files are run according
889 =item C<downgrade> Gets run when the schema is C<downgrade>d. Structure is a directory
890 per downgrade step, (for example, C<2-1> for downgrading from version 2 to version
891 1,) and then files are merged with C<_common> and run in filename order.
892 C<.sql> files are merely run, as expected. C<.pl> files are run according
900 Note that there can be an C<_any> in the place of any of the versions (like
901 C<1-2> or C<1>), which means those scripts will be run B<every> time. So if
902 you have an C<_any> in C<_common/upgrade>, that script will get run for every
907 A perl script for this tool is very simple. It merely needs to contain an
908 anonymous sub that takes a L<DBIx::Class::Schema> and the version set as it's
911 A very basic perl script might look like:
918 use DBIx::Class::DeploymentHandler::DeployMethod::SQL::Translator::ScriptHelpers
919 'schema_from_schema_loader';
921 schema_from_schema_loader({ naming => 'v4' }, sub {
924 # [1] for deploy, [1,2] for upgrade or downgrade, probably used with _any
925 my $versions = shift;
927 $schema->resultset('Users')->create({
933 Note that the above uses
934 L<DBIx::Class::DeploymentHanlder::DeployMethod::SQL::Translator::ScriptHelpers/schema_from_schema_loader>.
935 Using a raw coderef is strongly discouraged as it is likely to break as you
940 This attribute will, when set to true (default is false), cause the DM to use
941 L<SQL::Translator> to use the C<_source>'s serialized SQL::Translator::Schema
942 instead of any pregenerated SQL. If you have a development server this is
943 probably the best plan of action as you will not be putting as many generated
944 files in your version control. Goes well with with C<databases> of C<[]>.
946 =attr force_overwrite
948 When this attribute is true generated files will be overwritten when the
949 methods which create such files are run again. The default is false, in which
950 case the program will die with a message saying which file needs to be deleted.
954 The L<DBIx::Class::Schema> (B<required>) that is used to talk to the database
955 and generate the DDL.
959 The L<DBIx::Class::Storage> that is I<actually> used to talk to the database
960 and generate the DDL. This is automatically created with L</_build_storage>.
962 =attr sql_translator_args
964 The arguments that get passed to L<SQL::Translator> when it's used.
966 =attr script_directory
968 The directory (default C<'sql'>) that scripts are stored in
972 The types of databases (default C<< [qw( MySQL SQLite PostgreSQL )] >>) to
977 Set to true (which is the default) to wrap all upgrades and deploys in a single
982 The version the schema on your harddrive is at. Defaults to
983 C<< $self->schema->schema_version >>.
987 This class is an implementation of
988 L<DBIx::Class::DeploymentHandler::HandlesDeploy>. Pretty much all the
989 documentation is there.