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package EntityModel::Web::Context; |
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{ |
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$EntityModel::Web::Context::VERSION = '0.004'; |
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} |
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use EntityModel::Class { |
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request => { type => 'EntityModel::Web::Request' }, |
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response => { type => 'EntityModel::Web::Response' }, |
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site => { type => 'EntityModel::Web::Site' }, |
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page => { type => 'EntityModel::Web::Page' }, |
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user => { type => 'EntityModel::Web::User' }, |
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session => { type => 'EntityModel::Web::Session' }, |
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data => { type => 'hash', subclass => 'data' }, |
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template => { type => 'EntityModel::Template' }, |
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}; |
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=head1 NAME |
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EntityModel::Web::Context - handle context for a web request |
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=head1 VERSION |
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version 0.004 |
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=head1 SYNOPSIS |
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my $web = EntityModel::Web->new; |
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my $req = EntityModel::Web::Request->new; |
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my $ctx = EntityModel::Web::Context->new( |
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request => $req |
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); |
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$ctx->find_page_and_data($web); |
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$ctx->resolve_data; |
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$ctx->process; |
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$ctx->save_session; |
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return $ctx->response; |
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=head1 DESCRIPTION |
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=cut |
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use EntityModel::Template; |
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=head1 METHODS |
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=cut |
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sub new { |
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my $class = shift; |
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my $self = $class->SUPER::new; |
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my %args = @_; |
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if(defined(my $req = delete $args{request})) { |
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$self->request($req); |
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} |
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if(defined(my $tmpl = delete $args{template})) { |
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$self->template($tmpl); |
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} else { |
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$self->{template} = EntityModel::Template->new; |
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} |
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return $self; |
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} |
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=head2 find_page_and_data |
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Locate the page and populate any initial data from the path information. |
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=cut |
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sub find_page_and_data { |
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my $self = shift; |
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my $web = shift; |
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my $host = $self->request->uri->host; |
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# my ($site) = grep { warn "have " . $_->host; $_->host eq $host } $web->site->list; |
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my ($site) = $web->site->list; |
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# grep(sub { $_[0] eq $host })->first; |
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logDebug("Check for site [%s]", $host); |
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return EntityModel::Error->new($self, "No site") unless $site; |
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$self->site($site); |
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# If we have a regex match, return the remaining entries |
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my ($page, @data) = $site->page_from_uri($self->request->uri); |
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unless($page) { |
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logWarning("Failed to find page for URI [%s]", $self->request->uri); |
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logInfo("Page [%s]", $_->path) for $site->page->list; |
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} |
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return EntityModel::Error->new($self, "No page") unless $page; |
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# Pick up the page entry first |
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$self->page($page); |
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logDebug("Page is [%s]", $page->name); |
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# Get all page entries in order from first to last |
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my @pages = $page; |
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while($page->parent) { |
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$page = $page->parent; |
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unshift @pages, $page; |
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} |
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# Apply data for any entries that have regex captures |
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my %page_data; |
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foreach my $p (@pages) { |
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my %page_data = $p->extract_data(\@data); |
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$self->data->set($_, $page_data{$_}) for keys %page_data; |
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} |
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return $self; |
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} |
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108
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=head2 data_missing |
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Returns number of missing dependencies for the given L entry. |
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=cut |
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sub data_missing { |
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my ($self, $entry) = @_; |
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return 0 unless $entry; |
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my @missing = grep { |
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defined($_->data) && !$self->data->exists($_->data) |
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} $entry->parameter->list; |
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push @missing, $entry if $entry->data && !$self->data->exists($entry->data); |
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logDebug("Data $entry requires " . join(', ', map { $_->value } @missing) . " items which are not ready yet") if @missing; |
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return scalar(@missing); |
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} |
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=head2 resolve_data |
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129
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Process all data for this page, handling initial population and then going through each item in |
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turn, adding it back to the queue if the dependencies aren't ready. |
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Chained method. |
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=cut |
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136
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sub resolve_data { |
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my $self = shift; |
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return EntityModel::Error->new($self, 'No page') unless $self->page; |
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# Get list of required items for this page |
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my @dataList = $self->page->data->list; |
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143
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# Iterate through them until we no longer have any entries to resolve (or all existing entries are |
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# failing). |
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my $failed = 0; |
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DATA: |
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while(@dataList) { |
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my $entry = shift(@dataList) or next DATA; |
149
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150
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logDebug("Resolve data for " . ($entry->key // 'undef')); |
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if($self->resolve_data_item($entry)) { |
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# Successful resolution means we should reset the failure counter |
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$failed = 0; |
154
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} else { |
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++$failed; |
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push @dataList, $entry; |
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} |
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159
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# If all entries in the queue are failing, raise an error here |
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return EntityModel::Error->new($self, sub { "Could not resolve items [%s], population failed", join ',', map { $_->key // 'undef' } @dataList }) if $failed && $failed >= @dataList; |
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} |
162
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163
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return $self; |
164
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} |
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166
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=head2 find_data_value |
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168
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Retrieve data value for given L entry. |
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170
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=cut |
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172
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sub find_data_value { |
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my $self = shift; |
174
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my $entry = shift; |
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176
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my $v; |
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178
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if(defined $entry->value) { |
179
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# Simple value, used for constants |
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$v = $entry->value; |
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} elsif($entry->class) { |
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# Class method |
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$v = $self->data_from_class_method($entry); |
184
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} elsif ($entry->instance) { |
185
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# Instance method |
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$v = $self->data_from_instance_method($entry); |
187
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} elsif ($entry->data) { |
188
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# Data value from somewhere else |
189
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$v = $self->data->get($entry->data); |
190
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} else { |
191
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# Default case - probably an error |
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logDebug(" * $_ => " . $entry->{$_}) foreach keys %$entry; |
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logError({ %$entry }); |
194
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$v = EntityModel::Error->new($self, 'Unknown data type'); |
195
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} |
196
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return $v; |
197
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} |
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199
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=head2 resolve_data_item |
200
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201
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Resolve a single data item if we can. |
202
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203
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Returns undef on failure, original entry on success. |
204
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205
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=cut |
206
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207
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sub resolve_data_item { |
208
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my $self = shift; |
209
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my $entry = shift; |
210
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my $k = $entry->key; |
211
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212
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if($self->data_missing($entry)) { |
213
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logDebug("Deferring " . $k); |
214
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return undef; |
215
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} |
216
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217
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my $v = $self->find_data_value($entry); |
218
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$self->data->{$k} = $v unless eval { $v->isa('EntityModel::Error') }; |
219
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220
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logDebug("Data [$k] is now " . ($self->data->{$k} // 'undef')); |
221
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return $entry; |
222
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} |
223
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224
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=head2 args_for_data |
225
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226
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Generate list of arguments for a method call. |
227
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228
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=cut |
229
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230
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sub args_for_data { |
231
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my $self = shift; |
232
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my $entry = shift; |
233
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234
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my @param; |
235
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$entry->parameter->each($self->sap(sub { |
236
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my ($self, $item) = @_; |
237
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push @param, $self->find_data_value($item); |
238
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})); |
239
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return @param; |
240
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} |
241
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242
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=head2 data_from_class_method |
243
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244
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Call class method to obtain new data value. |
245
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246
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=cut |
247
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248
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sub data_from_class_method { |
249
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my $self = shift; |
250
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my $entry = shift; |
251
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my $class = $entry->class; |
252
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my $method = $entry->method; |
253
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254
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return EntityModel::Error->new($self, 'No class provided') unless $class; |
255
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return EntityModel::Error->new($self, 'Invalid method %s for %s', $method, $class) unless $class->can($method); |
256
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257
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return try { |
258
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$class->$method($self->args_for_data($entry)); |
259
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} catch { |
260
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EntityModel::Error->new($self, "Failed in %s->%s for %s: %s", $class, $method, $entry->key, $_); |
261
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}; |
262
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} |
263
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264
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=head2 data_from_instance_method |
265
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266
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Instance method, in which case hopefully we already set this one up |
267
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268
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=cut |
269
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270
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sub data_from_instance_method { |
271
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my $self = shift; |
272
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my $entry = shift; |
273
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logDebug("Look up [%s]", $entry->instance); |
274
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275
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my $obj = $self->data->get($entry->instance); |
276
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$obj ||= $self->site if $entry->instance eq 'site'; |
277
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$obj ||= $self->page if $entry->instance eq 'page'; |
278
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|
$obj ||= $self if $entry->instance eq 'context'; |
279
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|
logDebug("Got [%s]", $obj); |
280
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|
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|
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|
my $method = $entry->method; |
281
|
|
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|
my $v = try { |
282
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|
logDebug("Call $method"); |
283
|
|
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|
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|
|
my @args = $self->args_for_data($entry); |
284
|
|
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|
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|
|
$obj->$method(@args); |
285
|
|
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|
|
|
|
} catch { |
286
|
|
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|
|
|
|
logError("Method [%s] not valid for class %s on key %s, error %s", $method, $obj, $entry->key, $_); |
287
|
|
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|
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|
|
}; |
288
|
|
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|
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|
|
logDebug("Had [%s]", $v); |
289
|
|
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|
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|
|
return $v; |
290
|
|
|
|
|
|
|
} |
291
|
|
|
|
|
|
|
|
292
|
|
|
|
|
|
|
=head2 process |
293
|
|
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|
|
|
|
|
294
|
|
|
|
|
|
|
=cut |
295
|
|
|
|
|
|
|
|
296
|
|
|
|
|
|
|
sub process { |
297
|
|
|
|
|
|
|
my $self = shift; |
298
|
|
|
|
|
|
|
logDebug("Try to handle request for this page"); |
299
|
|
|
|
|
|
|
|
300
|
|
|
|
|
|
|
$self->page->handle_request(request => $self->request, data => $self->data); |
301
|
|
|
|
|
|
|
|
302
|
|
|
|
|
|
|
my %section = map { |
303
|
|
|
|
|
|
|
$_->section => $self->section_content($_->section) |
304
|
|
|
|
|
|
|
} $self->site->layout->list; |
305
|
|
|
|
|
|
|
my $tmpl = $self->page->template // $self->site->template; |
306
|
|
|
|
|
|
|
return '' unless $tmpl; |
307
|
|
|
|
|
|
|
|
308
|
|
|
|
|
|
|
return $self->template->as_text($tmpl, { |
309
|
|
|
|
|
|
|
context => $self, |
310
|
|
|
|
|
|
|
page => $self->page, |
311
|
|
|
|
|
|
|
data => $self->data, |
312
|
|
|
|
|
|
|
section => \%section |
313
|
|
|
|
|
|
|
}); |
314
|
|
|
|
|
|
|
} |
315
|
|
|
|
|
|
|
|
316
|
|
|
|
|
|
|
|
317
|
|
|
|
|
|
|
=head2 section_content |
318
|
|
|
|
|
|
|
|
319
|
|
|
|
|
|
|
=cut |
320
|
|
|
|
|
|
|
|
321
|
|
|
|
|
|
|
sub section_content { |
322
|
|
|
|
|
|
|
my $self = shift; |
323
|
|
|
|
|
|
|
my $section = shift or return ''; |
324
|
|
|
|
|
|
|
return EntityModel::Error->new($self, 'No page defined') unless $self->page; |
325
|
|
|
|
|
|
|
|
326
|
|
|
|
|
|
|
logDebug("Try section [%s]", $section); |
327
|
|
|
|
|
|
|
my $content = $self->page->content_by_section->get($section); |
328
|
|
|
|
|
|
|
logDebug("Had content [%s]", $content); |
329
|
|
|
|
|
|
|
return EntityModel::Error->new($self, "Section [$section] not found") unless $content; |
330
|
|
|
|
|
|
|
logDebug("Template [%s]", $content->template); |
331
|
|
|
|
|
|
|
return $self->template->as_text($content->template, { |
332
|
|
|
|
|
|
|
context => $self, |
333
|
|
|
|
|
|
|
page => $self->page, |
334
|
|
|
|
|
|
|
data => $self->data, |
335
|
|
|
|
|
|
|
}); |
336
|
|
|
|
|
|
|
} |
337
|
|
|
|
|
|
|
|
338
|
|
|
|
|
|
|
=head2 load_session |
339
|
|
|
|
|
|
|
|
340
|
|
|
|
|
|
|
Loads session data into the current context. |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
=cut |
343
|
|
|
|
|
|
|
|
344
|
|
|
|
|
|
|
sub load_session { |
345
|
|
|
|
|
|
|
my $self = shift; |
346
|
|
|
|
|
|
|
} |
347
|
|
|
|
|
|
|
|
348
|
|
|
|
|
|
|
=head2 save_session |
349
|
|
|
|
|
|
|
|
350
|
|
|
|
|
|
|
=cut |
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
sub save_session { |
353
|
|
|
|
|
|
|
my $self = shift; |
354
|
|
|
|
|
|
|
} |
355
|
|
|
|
|
|
|
|
356
|
|
|
|
|
|
|
1; |
357
|
|
|
|
|
|
|
|
358
|
|
|
|
|
|
|
__END__ |