| Path : /usr/share/z-push/lib/core/ |
|
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| Current File : //usr/share/z-push/lib/core/pingtracking.php |
<?php
/***********************************************
* File : pingtracking.php
* Project : Z-Push
* Descr :
*
* Created : 20.10.2011
*
* Copyright 2007 - 2016 Zarafa Deutschland GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Consult LICENSE file for details
************************************************/
class PingTracking extends InterProcessData {
/**
* Constructor
*
* @access public
*/
public function __construct() {
// initialize super parameters
$this->allocate = 512000; // 500 KB
$this->type = 2;
parent::__construct();
$this->initPing();
}
/**
* Destructor
* Used to remove the current ping data from shared memory
*
* @access public
*/
public function __destruct() {
// exclusive block
if ($this->blockMutex()) {
$pings = $this->getData();
// check if our ping is still in the list
if (isset($pings[self::$devid][self::$user][self::$pid])) {
unset($pings[self::$devid][self::$user][self::$pid]);
$stat = $this->setData($pings);
}
$this->releaseMutex();
}
// end exclusive block
}
/**
* Initialized the current request
*
* @access public
* @return boolean
*/
protected function initPing() {
$stat = false;
// initialize params
$this->initializeParams();
// exclusive block
if ($this->blockMutex()) {
$pings = ($this->hasData()) ? $this->getData() : array();
// set the start time for the current process
$this->checkArrayStructure($pings);
$pings[self::$devid][self::$user][self::$pid] = self::$start;
$stat = $this->setData($pings);
$this->releaseMutex();
}
// end exclusive block
return $stat;
}
/**
* Checks if there are newer ping requests for the same device & user so
* the current process could be terminated
*
* @access public
* @return boolean true if the current process is obsolete
*/
public function DoForcePingTimeout() {
$pings = false;
// exclusive block
if ($this->blockMutex()) {
$pings = $this->getData();
$this->releaseMutex();
}
// end exclusive block
// check if there is another (and newer) active ping connection
if (is_array($pings) && isset($pings[self::$devid][self::$user]) && count($pings[self::$devid][self::$user]) > 1) {
foreach ($pings[self::$devid][self::$user] as $pid=>$starttime)
if ($starttime > self::$start)
return true;
}
return false;
}
/**
* Builds an array structure for the concurrent ping connection detection
*
* @param array $array reference to the ping data array
*
* @access private
* @return
*/
private function checkArrayStructure(&$array) {
if (!is_array($array))
$array = array();
if (!isset($array[self::$devid]))
$array[self::$devid] = array();
if (!isset($array[self::$devid][self::$user]))
$array[self::$devid][self::$user] = array();
}
}