How is Magento\Framework\View\Page\Config\Generator\Head::processMetadata() implemented and used?

dmitry_fedyuk · May 9, 2017, 1:19pm

Context: how is Magento\Framework\View\Page\Config::setMetadata() implemented and used?

Implementation

magento/magento2/blob/2.1.6/lib/internal/Magento/Framework/View/Page/Config/Generator/Head.php#L157-L169


/**
 * Process metadata
 *
 * @param \Magento\Framework\View\Page\Config\Structure $pageStructure
 * @return $this
 */
protected function processMetadata(Structure $pageStructure)
{
    foreach ($pageStructure->getMetadata() as $name => $content) {
        $this->pageConfig->setMetadata($name, $content);
    }
    return $this;
}

How is it called?

Step 1. Magento\Framework\View\Layout::build()

Step 2. Magento\Framework\View\Layout\Builder::build()

Step 3. Magento\Framework\View\Page\Builder::generateLayoutBlocks()

Step 4. Magento\Framework\View\Layout\Builder::generateLayoutBlocks()

github.com

magento/magento2/blob/2.1.6/lib/internal/Magento/Framework/View/Layout/Builder.php#L128-L129


/* generate blocks from xml layout */
$this->layout->generateElements();

Step 5. Magento\Framework\View\Layout::generateElements()

github.com

magento/magento2/blob/2.1.6/lib/internal/Magento/Framework/View/Layout.php#L326-L328


\Magento\Framework\Profiler::start('generate_elements');
$this->generatorPool->process($this->getReaderContext(), $generatorContext);
\Magento\Framework\Profiler::stop('generate_elements');

Step 6.\Magento\Framework\View\Layout\GeneratorPool::process()

github.com

magento/magento2/blob/2.1.6/lib/internal/Magento/Framework/View/Layout/GeneratorPool.php#L86-L86


$generator->process($readerContext, $generatorContext);

Step 7. Magento\Framework\View\Page\Config\Generator\Head::process()

github.com

magento/magento2/blob/2.1.6/lib/internal/Magento/Framework/View/Page/Config/Generator/Head.php#L80-L98


/**
 * {@inheritdoc}
 *
 * @param Layout\Reader\Context $readerContext
 * @param Layout\Generator\Context $generatorContext
 * @return $this
 */
public function process(Layout\Reader\Context $readerContext, Layout\Generator\Context $generatorContext)
{
    $structure = $readerContext->getPageConfigStructure();
    $structure->processRemoveAssets();
    $structure->processRemoveElementAttributes();


    $this->processAssets($structure);
    $this->processTitle($structure);
    $this->processMetadata($structure);
    $this->processElementAttributes($structure);
    return $this;
}

Step 8. Magento\Framework\View\Page\Config\Generator\Head::processMetadata()

github.com

magento/magento2/blob/2.1.6/lib/internal/Magento/Framework/View/Page/Config/Generator/Head.php#L157-L169


/**
 * Process metadata
 *
 * @param \Magento\Framework\View\Page\Config\Structure $pageStructure
 * @return $this
 */
protected function processMetadata(Structure $pageStructure)
{
    foreach ($pageStructure->getMetadata() as $name => $content) {
        $this->pageConfig->setMetadata($name, $content);
    }
    return $this;
}

dmitry_fedyuk · May 9, 2017, 1:22pm