Overview of how a page request is processed

From CaravelWiki

Here is the main flow of execution when loading a Caravel page.

• index.php
  • Caravel_HTTP::create
    • Caravel_HTTP::parseRequest
    • Caravel_HTTP::login_logout
    • Caravel_HTTP::displayFile (if downloading a file)
    • Site::loadByPath
      • Site::load
        • Site::getExternals
        • Site::validateSiteDNAndSectionPath
          • Site::initPrivs
        • Site::getButtonRows
        • Site::execAdminParams
          • --> various site operations
        • Section::create
          • Section::initPrivs
          • Section::loadTemplate
          • Section::fetchBlocksList
            • Block::create (for each block)
          • Section::loadDynamicBlocks
            • Block::create (for each block)
          • Section::checkModifiedBlocks
          • Section::execAdminParams
            • --> various section (page) operations
          • Block::startApp (for each block)
            • App::init
              • App::initPrivs
              • App::getSettingsVars
              • App::getSiteVars
              • (App)::onInit
              • (App)::onSave
    • Display::create
  • Caravel_HTTP::get
    • Display::get
      • Display::getRSS (if format=rss)
      • for single block mode:
        • App::init
        • App::getAllHeaders
        • (handle cv_widgets)
        • App::getAjax (if requested via ajax)
        • App::dispatch
          • (print javascript to close window, and exit, if user clicked Save & Close)
          • (App)::getConfig (if in edit mode)
          • (App)::getContent (if in preview mode)
        • App::getContent (for extension blocks, e.g. Comments)
        • (display errors)
      • for normal mode:
        • Section::getHeader
        • SideBar::getContent
        • Site::getContent
          • Section::getContent
            • (handle publishing, if called from the publishing functions in Site)
            • Section::getRowsHTML (for the template)
              • (similar to below when the same function is run to get the content area)
              • Block::getContent (if loading a single block, with navigation)
              • Section::getSnapshot (if loading a published page)
              • Section::getRowsHTML (for the page itself -- if not loading a published page)
                • Block::getRescue (for each block -- if in rescue mode)
                • Block::getContent (for each block -- if NOT in rescue mode)
                  • (redirect to login if login is required for this block)
                  • (App)::dispatch
                    • (print javascript to close window, and exit, if user clicked Save & Close)
                    • (App)::getConfig (if in edit mode)
                    • (App)::getContent (if in preview mode)
                  • Block::getContent (for any block extensions, e.g. Comments)
                • Section::getToolbar (for each of various toolbars)
                • (generate the footer)
        • Section::getToolbar
        • (display errors)
        • (display debug info)