app->albumDir . "/block-random.cache");
// Defaulted to 86400
define(CACHE_EXPIRED, 9000);
// Check the cache file to see if it's up to date
$rebuild = 1;
if (fs_file_exists(CACHE_FILE)) {
$stat = fs_stat(CACHE_FILE);
$mtime = $stat[9];
if (time() - $mtime < CACHE_EXPIRED) {
$rebuild = 0;
}
}
if ($rebuild) {
scanAlbums();
saveCache();
} else {
readCache();
}
$album = chooseAlbum();
if ($album) {
$index = choosePhoto($album);
}
if (isset($index)) {
$id = $album->getPhotoId($index);
echo ""
/* ."" */
.""
/* ."" */
.$album->getThumbnailTag($index)
."";
} else {
echo $index ;
/* $id = $album->getPhotoId(1);
echo ""
.""
.$album->getThumbnailTag($index)
.""; */
}
if ($profile) {
$elapsed = time() - $timer;
print "
Elapsed: $elapsed secs";
}
/*
* --------------------------------------------------
* Support functions
* --------------------------------------------------
*/
function saveCache() {
global $cache;
if ($fd = fs_fopen(CACHE_FILE, "w")) {
foreach ($cache as $key => $val) {
fwrite($fd, "$key/$val\n");
}
fclose($fd);
}
}
function readCache()
{
global $cache;
if ($fd = fs_fopen(CACHE_FILE, "r"))
{
while ($line = fgets($fd, 4096))
{
list($key, $val) = explode("/", trim($line));
$cache[$key] = $val;
}
fclose($fd);
}
}
function choosePhoto($album) {
global $cache;
$count = $cache[$album->fields["name"]];
if ($count == 0) {
// Shouldn't happen
return null;
} else if ($count == 1) {
$choose = 1;
} else {
$choose = rand(1, $count);
$wrap = 0;
if ($album->isHidden($choose)) {
$choose++;
if ($choose > $album->numPhotos(1)) {
$choose = 1;
$wrap++;
if ($wrap = 2) {
return null;
}
}
}
}
return $choose;
}
function chooseAlbum() {
global $cache;
/*
* The odds that an album will be selected is proportional
* to the number of (visible) items in the album.
*/
$total = 0;
foreach ($cache as $name => $count) {
if (!$choose) {
$choose = $name;
}
$total += $count;
if ($total != 0 && ($total == 1 || rand(1, $total) <= $count)) {
$choose = $name;
}
}
if ($choose) {
$album = new Album();
$album->load($choose);
return $album;
} else {
return null;
}
}
function scanAlbums() {
global $cache;
global $gallery;
$cache = array();
$everybody = $gallery->userDB->getEverybody();
$albumDB = new AlbumDB();
foreach ($albumDB->albumList as $tmpAlbum) {
if ($everybody->canReadAlbum($tmpAlbum)) {
$seeHidden = $everybody->canWriteToAlbum($tmpAlbum);
$numPhotos = $tmpAlbum->numPhotos($seeHidden);
$name = $tmpAlbum->fields["name"];
if ($numPhotos > 0) {
$cache[$name] = $numPhotos;
}
}
}
}
?>