将ServiceManager修改为单例模式，修改几处ServiceManager调用

Westdc/Db/Dbh.php

@@ -54,6 +54,7 @@ class Dbh
 			}
 		}else{
 			$sql = "INSERT INTO \"".$table."\" ($fields) VALUES ($datas) RETURNING id";
+			//exit($sql);
 			try{
 				$sth = $this->db->prepare($sql);
 				if($sth->execute())

Westdc/File/Listener/DefaultFileUploadListener.php

@@ -14,7 +14,7 @@ class DefaultFileUploadListener implements ListenerAggregateInterface
 
 	function __construct()
 	{
-        $this->serviceManager = new ServiceManager();
+        $this->serviceManager = ServiceManager::getInstance();
         $this->serviceManager = $this->serviceManager->getServiceManager();
 	}
 	

Westdc/Mail/Mail.php

@@ -43,7 +43,7 @@ class Mail extends AbstractEventManager implements ServiceManagerAwareInterface{
     {
         if(!$this->serviceManager instanceof ServiceManager)
         {
-            $serviceManager = new WestdcServiceManager();
+            $serviceManager = WestdcServiceManager::getInstance();
             $this->serviceManager = $serviceManager->getServiceManager();
         }
 

Westdc/Mail/Sender.php

@@ -29,7 +29,7 @@ class Sender implements ServiceManagerAwareInterface{
     {
         if(!$this->serviceManager instanceof ServiceManager)
         {
-            $serviceManager = new WestdcServiceManager();
+            $serviceManager = WestdcServiceManager::getInstance();
             $this->serviceManager = $serviceManager->getServiceManager();
         }
     }

Westdc/Service/ServiceManager.php

@@ -1,20 +1,25 @@
 <?php
-/**
- * Created by PhpStorm.
- * User: Administrator
- * Date: 2014/11/11
- * Time: 11:12
- */
-
 namespace Westdc\Service;
 
 use Zend\ServiceManager\ServiceManager as Zend_ServiceManager;
 
 class ServiceManager {
 
+    private static $instance = NULL;
+
+    public static function getInstance()
+    {
+
+        if (self::$instance === null) {
+            self::$instance = new self;
+        }
+
+        return self::$instance;
+    }
+
     private $serviceManager;
 
-    function __construct()
+    private function __construct()
     {
         $this->serviceManager = new Zend_ServiceManager;
         $this->serviceManager->addAbstractFactory(new ServiceFactory);