From b752befd19233618c7681ce29308cd485502dd5e Mon Sep 17 00:00:00 2001
From: marcus <marcus@36083f99-b078-4883-b0ff-0f9b5a30f544>
Date: Thu, 6 Nov 2008 11:09:10 +0000
Subject: Added test to see if memcache is available.

git-svn-id: https://code.elgg.org/elgg/trunk@2411 36083f99-b078-4883-b0ff-0f9b5a30f544
---
 engine/lib/cache.php    |  9 ++-------
 engine/lib/memcache.php | 25 +++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 7 deletions(-)

diff --git a/engine/lib/cache.php b/engine/lib/cache.php
index 0363f501b..23f3c302b 100644
--- a/engine/lib/cache.php
+++ b/engine/lib/cache.php
@@ -450,13 +450,8 @@
 		// TODO : hook out to the world ? (can't if using as object cache)
 		
 		// Try and see if memcache is present & enabled
-		try {
-			if ((isset($CONFIG->memcache) && ($CONFIG->memcache=true)))
-				return new ElggMemcache($namespace);
-		} catch (Exception $e) {
-			if ((isset($CONFIG->debug)) && ($CONFIG->debug == true))
-				error_log("$e");
-		}
+		if (is_memcache_available())
+			return new ElggMemcache($namespace);
 		
 		return new ElggStaticVariableCache($namespace);
 	}
diff --git a/engine/lib/memcache.php b/engine/lib/memcache.php
index 8afef6302..ec3ebc783 100644
--- a/engine/lib/memcache.php
+++ b/engine/lib/memcache.php
@@ -213,4 +213,29 @@
 			$this->save_persistent_keylist();
 		}*/
 	}
+	
+	/**
+	 * Return true if memcache is available and configured.
+	 *
+	 * @return bool
+	 */
+	function is_memcache_available()
+	{
+		global $CONFIG;
+		
+		static $memcache_available;
+		
+		if ((!isset($CONFIG->memcache)) || (!$CONFIG->memcache))
+			return false;
+		
+		if (($memcache_available!==true) && ($memcache_available!==false)) // If we haven't set variable to something
+		{
+			try {
+				$tmp = new ElggMemcache();
+				$memcache_available = true; // No exception thrown so we have memcache available
+			} catch (Exception $e) { $memcache_available = false; }
+		}
+		
+		return $memcache_available;
+	}
 ?>
\ No newline at end of file
-- 
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