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<?php
namespace BigPipe;
class BigPipe {
private static $enabled = TRUE;
private static $debug = TRUE;
private static $pagelets = [];
private static $count = 0;
#===============================================================================
# Return TRUE if the pipeline is enabled
#===============================================================================
public static function isEnabled() {
return self::$enabled;
}
#===============================================================================
# Enable or disable the pipeline mode
#===============================================================================
public static function enablePipeline($enabled = TRUE) {
return self::$enabled = (bool) $enabled;
}
#===============================================================================
# Add a new pagelet to pipeline
#===============================================================================
public static function addPagelet(Pagelet $Pagelet, $priority) {
self::$pagelets[$priority][] = $Pagelet;
return ++self::$count;
}
#===============================================================================
# Prints a single pagelet response
#===============================================================================
private static function singleResponse(Pagelet $Pagelet, $last = FALSE) {
$data = [
'ID' => $Pagelet->getID(),
'RESOURCES' => ['CSS' => $Pagelet->getCSSFiles(), 'JS' => $Pagelet->getJSFiles(), 'JS_CODE' => removeLineBreaksAndTabs($Pagelet->getJSCode())],
'PHASES' => (object) $Pagelet->getPhaseDoneJS(),
];
if($last) {
$data['IS_LAST'] = true;
}
$pageletHTML = str_replace('--', '--', removeLineBreaksAndTabs($Pagelet->getHTML()));
$pageletJSON = json_encode($data, (self::$debug ? JSON_PRETTY_PRINT : FALSE));
echo "<code class=\"hidden\" id=\"_{$Pagelet->getID()}\"><!-- {$pageletHTML} --></code>\n";
echo "<script>BigPipe.onPageletArrive({$pageletJSON}, (document.getElementById(\"_{$Pagelet->getID()}\")));</script>\n\n";
}
#===============================================================================
# Sends output buffer so far as possible towards user
#===============================================================================
public static function flushOutputBuffer() {
ob_flush(); flush();
}
#===============================================================================
# Render the pagelets
#===============================================================================
public static function render() {
self::flushOutputBuffer();
$i = 0;
ksort(self::$pagelets);
foreach(array_reverse(self::$pagelets) as $priority => $pagelets) {
foreach($pagelets as $Pagelet) {
if(!self::isEnabled()) {
foreach($Pagelet->getCSSFiles() as $CSSFile) {
echo '<link href="'.$CSSFile.'" rel="stylesheet" />'."\n";
}
foreach($Pagelet->getJSFiles() as $JSFile) {
echo '<script src="'.$JSFile.'"></script>'."\n";
}
if($Pagelet->getJSCode()) {
echo '<script>'.$Pagelet->getJSCode().'</script>'."\n";
}
}
else {
self::singleResponse($Pagelet, (self::$count === ++$i));
self::flushOutputBuffer();
self::$debug AND usleep((rand(250, 1000) * 1000));
}
}
}
}
}
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