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<?php
class SCHEDULER {
const FLAGS_DEFAULT = 0;
const AUTO_RESTART = 1; // Re-start from the beginning if processing cycle is finished
const ACTIVITY_CACHE = "cache";
const MODE_CURRENT = "current";
const MODE_ARCHIVE = "archive";
const MODE_UNIVERSAL = false;
const CACHE_CURRENT = SCHEDULER::MODE_CURRENT; // Consider only currently active databases...
const CACHE_ARCHIVE = SCHEDULER::MODE_ARCHIVE; // Process also archived caches...
const CACHE_UNIVERSAL = SCHEDULER::MODE_UNIVERSAL; // Universal caching mode, we decide the best order for a single group of cachers...
var $lock;
var $sched_flags;
var $sched_path;
var $sched_activity;
var $sched_mode;
function __construct(REQUEST $req = NULL, $activity = SCHEDULER::ACTIVITY_CACHE, $mode = SCHEDULER::MODE_CURRENT, $flags = SCHEDULER::FLAGS_DEFAULT) {
global $ADEI_SETUP;
global $TMP_PATH;
global $ADEI_CONTINUOUS_CACHING;
if ($req) $this->req = $req;
else $this->req = new REQUEST();
if (!$mode)
throw new ADEIException(translate("Universal scheduling mode is not supported yet"));
$name = $ADEI_SETUP . "_" . $activity . "_" . $mode;
if (!preg_match('/^[\-_a-zA-Z0-9]+$/', $name))
throw new ADEIException(translate("Invalid symbols (%s) in scheduling activity and mode", $name));
if ($ADEI_CONTINUOUS_CACHING) {
if (($activity == SCHEDULER::ACTIVITY_CACHE)&&($mode == SCHEDULER::MODE_CURRENT))
$flags |= SCHEDULER::AUTO_RESTART;
}
$dir = $TMP_PATH . "/scheduler";
if (!is_dir($dir)) {
if (!@mkdir($dir, 0777 /*0755*/, true))
throw new ADEIException(translate("It is not possible to create scheduler directory \"$dir\""));
# When creating from apache, the 0777 mode is ignored for unknown reason
@chmod($dir, 0777);
}
$this->lock = new LOCK($name);
$this->sched_flags = $flags;
$this->sched_path = "$dir/$name";
$this->sched_activity = $activity;
$this->sched_mode = $mode;
}
private function GetList(REQUEST $user_req, $split, $flags = REQUEST::PRINT_ERRORS) {
switch($split) {
case "servers":
$list = $user_req->GetServers($flags);
break;
case "sources":
$list = $user_req->GetSources($flags);
break;
case "groups":
$list = $user_req->GetGroups($flags);
break;
default:
throw new ADEIException(translate("Unsupported type of parallelization (%s)", $split));
}
$req_list = array();
foreach ($list as $key => $sreq) {
# if (isset($user_req->props['db_server'])&&($user_req->props['db_server'] != $sreq->props['db_server'])) continue;
# if (isset($user_req->props['db_name'])&&($user_req->props['db_name'] != $sreq->props['db_name'])) continue;
$req_list[$key] = $sreq->props;
}
return $req_list;
}
private function Schedule(array $req_list) {
$fname = "{$this->sched_path}.cache";
$rname = "{$this->sched_path}.reset";
if (!$this->lock->Lock(LOCK::BLOCK|LOCK::EXCLUSIVE))
throw new ADEIException(translate("Scheduler is not able to acquire a lock for \"%s\"", $fname));
if (count($req_list) > 0) {
if ((($this->sched_flags&SCHEDULER::AUTO_RESTART) == 0)&&(file_exists($fname)))
@file_put_contents($rname, "");
$bytes = file_put_contents($fname, serialize($req_list));
$this->lock->Unlock();
} else {
if (file_exists($fname))
@unlink($fname);
if (file_exists($rname))
@unlink($rname);
}
if ($bytes === false)
throw new ADEIException(translate("Scheduler is not able to open \"%s\"", $fname));
}
function ScheduleRequestList(REQUESTList $list, $split = "sources") {
$user_req = $this->req;
$req_list = array();
foreach ($list as $sreq) {
if (isset($user_req->props['db_server'])&&($user_req->props['db_server'] != $sreq->props['db_server'])) continue;
if (isset($user_req->props['db_name'])&&($user_req->props['db_name'] != $sreq->props['db_name'])) continue;
array_push($req_list, $sreq->props);
}
$this->Schedule($list);
}
function ScheduleRequest(REQUEST $req = NULL, $split = "sources") {
if (!$req) $this->req = $req;
$list = $this->GetList($req, $split);
if ($this->sched_mode == SCHEDULER::MODE_ARCHIVE) {
$wlist = $this->GetList($req, $split, REQUEST::LIST_WILDCARDED);
$list = array_diff_key($wlist, $list);
}
$this->Schedule($list);
}
function Get() {
$iname = "{$this->sched_path}.index";
$fname = "{$this->sched_path}.cache";
$rname = "{$this->sched_path}.reset";
if (!$this->lock->Lock(LOCK::BLOCK|LOCK::EXCLUSIVE))
throw new ADEIException(translate("Scheduler is not able to acquire a lock for \"%s\"", $fname));
if (!file_exists($fname)) {
$this->lock->Unlock();
return array();
}
$data = @file_get_contents($fname);
if ($data === false) {
$this->lock->Unlock();
throw new ADEIException(translate("Scheduler is not able to read \"%s\"", $fname));
}
$props_list = unserialize($data);
if (($props_list === false)||(!is_array($props_list))) {
$this->lock->Unlock();
throw new ADEIException(translate("Scheduler is not able to parse \"%s\"", $fname));
}
if (count($props_list) == 0) {
return array();
}
$index = @file_get_contents($iname);
if ($index === false) $index = 0;
else if ($index >= count($props_list)) {
// We restarting standard, but pausing archive caching
if (($this->sched_flags&SCHEDULER::AUTO_RESTART) == 0) {
unlink($fname);
if (file_exists($rname)) unlink($rname);
else {
$bytes = file_put_contents($iname, 0);
$this->lock->Unlock();
if ($bytes === false)
throw new ADEIException(translate("Scheduler is not able to open \"%s\"", $iname));
return array();
}
}
$index = 0;
}
$bytes = file_put_contents($iname, ($index + 1));
$this->lock->Unlock();
if ($bytes === false)
throw new ADEIException(translate("Scheduler is not able to open \"%s\"", $iname));
$keys = array_keys($props_list);
$res = array_merge($props_list[$keys[$index]], array(
"sched_activity" => $this->sched_activity,
"sched_mode" => $this->sched_mode // In Universal mode, we should return the real mode of the returned item
));
return $res;
}
function GetProps() {
return $this->Get();
}
}
?>
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