<?php
if(!defined('sugarEntry') || !sugarEntry) die('Not A Valid Entry Point');
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 * SugarCRM is a customer relationship management program developed by
 * SugarCRM, Inc. Copyright (C) 2004 - 2008 SugarCRM Inc.
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License version 3 as published by the
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 * to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED WORK
 * IN WHICH THE COPYRIGHT IS OWNED BY SUGARCRM, SUGARCRM DISCLAIMS THE WARRANTY
 * OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 * 
 * 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 General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, see http://www.gnu.org/licenses or write to the Free
 * Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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 * 
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require_once('modules/Trackers/monitor/Monitor.php');
require_once('modules/Administration/Administration.php');


class TrackerManager {

private static $instance;
private static $monitor_id;
private $metadata = array();
private $monitors = array();
private $disabledMonitors = array();
private $paused = false;

/**
 * Constructor for TrackerManager.  Declared private for singleton pattern.
 *
 */
private function TrackerManager() {
	require('modules/Trackers/config.php');
	$this->metadata = $tracker_config;
    self::$monitor_id = create_guid();
}

/**
 * setup
 * This is a private method used to load the configuration settings whereby
 * monitors may be disabled via the Admin settings interface
 *
 */
private function setup() {
	if(!empty($this->metadata) && empty($GLOBALS['installing'])) {
        
		$admin = new Administration();
		$admin->retrieveSettings('tracker');
		foreach($this->metadata as $key=>$entry) {
		   if(isset($entry['bean'])) {
		   	  if(!empty($admin->settings['tracker_'. $entry['name']])) {
		   	  	 $this->disabledMonitors[$entry['name']] = true;
		   	  }
		   }
		}
	}   	
}

public function setMonitorId($id) {
    self::$monitor_id = $id;
    foreach($this->monitors as $monitor) {
       $monitor->monitor_id = self::$monitor_id;	
    }	
}

/**
 * getMonitorId
 * Returns the monitor id associated with this TrackerManager instance
 * @returns String id value
 */
public function getMonitorId() {
    return self::$monitor_id;
}

/**
 * getInstance
 * Singleton method to return static instance of TrackerManager
 * @returns static TrackerManager instance 
 */
static function getInstance(){	
    if (!isset(self::$instance)) {
        self::$instance = new TrackerManager();
		//Set global variable for tracker monitor instances that are disabled
        self::$instance->setup();  
    } // if
    return self::$instance;
}

/**
 * getMonitor
 * This method returns a Monitor instance based on the monitor name.
 * @param $name The String value of the monitor's name to retrieve
 * @return Monitor instance corresponding to name or a BlankMonitor instance if one could not be found
 */
public function getMonitor($name) {
	//don't waste our time on disabled monitors
	if(!empty($this->disabledMonitors[$name]))return false;
	if(isset($this->monitors[$name])) {
	   return $this->monitors[$name];	
	}
	
	if(isset($this->metadata) && isset($this->metadata[$name])) {
       
	  
       try {
	       $instance = $this->_getMonitor($this->metadata[$name]['name'], //name
	       						   self::$monitor_id, //monitor_id
	                               $this->metadata[$name]['metadata'],
	                               $this->metadata[$name]['store'] //store 
	                               );
	       $this->monitors[$name] = $instance;
	       return $this->monitors[$name];
       } catch (Exception $ex) {
       	   $GLOBALS['log']->error($ex->getMessage());
       	   $GLOBALS['log']->error($ex->getTraceAsString());
       	   require_once('modules/Trackers/monitor/BlankMonitor.php');
       	   $this->monitors[$name] = new BlankMonitor();
       	   return $this->monitors[$name];
       }

    } else {
       $GLOBALS['log']->error($GLOBALS['app_strings']['ERR_MONITOR_NOT_CONFIGURED'] . "($name)");
       require_once('modules/Trackers/monitor/BlankMonitor.php');
       $this->monitors[$name] = new BlankMonitor();
       return $this->monitors[$name];    
    }
}

private function _getMonitor($name='', $monitorId='', $metadata='', $store=''){
	$class = strtolower($name.'_monitor');
	$monitor = null;
	if(file_exists('custom/modules/Trackers/monitor/'.$class.'.php')){		
		require_once('custom/modules/Trackers/monitor/'.$class.'.php');
		if(class_exists($class)){				
			$monitor = new $class($name, $monitorId, $metadata, $store);
		}
	}elseif(file_exists('modules/Trackers/monitor/'.$class.'.php')){		
		require_once('modules/Trackers/monitor/'.$class.'.php');
		if(class_exists($class)){
			$monitor = new $class($name, $monitorId, $metadata, $store);
		}
	}else{
		$monitor = new Monitor($name, $monitorId, $metadata, $store);
	}
	return $monitor;
}

/**
 * save
 * This method handles saving the monitors and their metrics to the mapped Store implementations
 */
public function save() {
    if(!$this->paused){
		foreach($this->monitors as $monitor) {
			if(empty($this->disabledMonitors[$monitor->name]) && array_key_exists('Trackable', class_implements($monitor))) {
			   $monitor->save();
		    }
    	}
    }	
}

/**
 * saveMonitor
 * Saves the monitor instance and then clears it
 */
public function saveMonitor($monitor, $flush=true) {
	if(!$this->paused && !empty($monitor)){
		if(empty($this->disabledMonitors[$monitor->name]) && array_key_exists('Trackable', class_implements($monitor))) {
		   $monitor->save($flush);
		   if($flush) {
			   $monitor->clear();
			   unset($this->monitors[strtolower($monitor->name)]);
		   }
	    }
	}
}

/**
 * unsetMonitor
 * Method to unset the monitor so that it will not be saved
 */
public function unsetMonitor($monitor) {
   if(!empty($monitor)) {
      unset($this->monitors[strtolower($monitor->name)]);
   }
}

/**
 * pause
 * This function is to be called by a client in order to pause tracking through the lifetime of a Request.
 * Tracking can be started again by calling unPauseTracking
 *
 * Usage: TrackerManager::getInstance()->pauseTracking();
 */
public function pause(){
	$this->paused = true;
}

/**
 * unPause
 * This function is to be called by a client in order to unPause tracking through the lifetime of a Request.
 * Tracking can be paused by calling pauseTracking
 *
 *  * Usage: TrackerManager::getInstance()->unPauseTracking();
 */
public function unPause(){
	$this->paused = false;
}


/**
 * isPaused
 * This function returns the current value of the private paused variable.
 * The result indicates whether or not the TrackerManager is paused.
 * 
 * @return boolean value indicating whether or not TrackerManager instance is paused.
 */
public function isPaused() {
   return $this->paused;
}

/**
 * getDisabledMonitors
 * Returns an Array of Monitor's name(s) that hhave been set to disabled in the
 * Administration section.
 * 
 * @return Array of disabled Monitor's name(s) that hhave been set to disabled in the
 * Administration section.
 */
public function getDisabledMonitors() {
	return $this->disabledMonitors;
}


/**
 * unsetMonitors
 * Function to unset all Monitors loaded for a TrackerManager instance
 * 
 */
public function unsetMonitors() {
	$mons = $this->monitors;
	foreach($mons as $key=>$m) {
		$this->unsetMonitor($m);
	}
}

}
?>
