Changed: the way caches expire. (see dev forum)

Added: "private" caching. (see dev forum too ;)) git-svn-id: file:///svn/phpbb/trunk@4684 89ea8834-ac86-4346-8a33-228a782c2dd0
author: Ludovic Arnaud <ludovic_arnaud@users.sourceforge.net> 2003-11-26 23:34:33 +0000
committer: Ludovic Arnaud <ludovic_arnaud@users.sourceforge.net> 2003-11-26 23:34:33 +0000
commit: ac0b5d79ad4c6b7d1e9bf52763918f1e0017b9a0 (patch)
tree: ae435d9e1fe6180d9bed855c8f72b01ab3215d1a /phpBB/includes/acm
parent: 1dd9ad2f79c5d3e26705ea21396456d346c42c30 (diff)
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2 files changed, 191 insertions, 105 deletions
diff --git a/phpBB/includes/acm/acm_db.php b/phpBB/includes/acm/acm_db.php
index 6301307723..ed57e7605a 100644
--- a/phpBB/includes/acm/acm_db.php
+++ b/phpBB/includes/acm/acm_db.php
@@ -13,30 +13,51 @@
 
 class acm
 {
+	// Contains all loaded variables
 	var $vars = '';
-	var $is_modified = FALSE;
+
+	// Contains the names of the variables that are ready to be used
+	// (iow, variables that have been unserialized)
+	var $var_ready = array();
+
+	// Contains variables that have been updated or destroyed this session
+	var $var_expires = array();
+
+	// Contains variables that have already been requested
+	// If a variable has been requested but not loaded, it simply means it
+	// wasn't found in the db
+	var $var_requested = array();
 
 	function load($var_names = '')
 	{
 		global $db;
 		$this->vars = array();
 
-		$sql = 'SELECT var_name, var_ts, var_data
-			FROM ' . CACHE_TABLE;
-
-		if (!empty($var_names))
+		if (is_array($var_names))
 		{
-			$sql .= "\nWHERE var_name IN ('" . implode("', '", $var_names) . "')";
+			$var_requested = $var_names;
+			$sql_condition = "var_name IN ('" . implode("', '", $var_names) . "')";
+		}
+		else
+		{
+//			$sql_condition = "var_name NOT LIKE '\_%'";
+			$sql_condition = "LEFT(var_name, 1) <> '_'";
 		}
 
+		$sql = 'SELECT var_name, var_data
+			FROM ' . CACHE_TABLE . '
+			WHERE var_expires > ' . time() . "
+				AND $sql_condition";
 		$result = $db->sql_query($sql);
 
 		while ($row = $db->sql_fetchrow($result))
 		{
-			$this->vars[$row['var_name']] = array(
-				'data'	=>	unserialize($row['var_data']),
-				'ts'		=>	intval($row['var_ts'])
-			);
+			$this->vars[$row['var_name']] = $row['var_data'];
+
+			if (!$var_names)
+			{
+				$var_requested[] = $row['var_name'];
+			}
 		}
 	}
 
@@ -48,31 +69,22 @@ class acm
 
 	function save()
 	{
-		if (!$this->is_modified)
-		{
-			return;
-		}
-
 		global $db;
 
 		$delete = $insert = array();
-		foreach ($this->vars as $var_name => $var_ary)
+		foreach ($this->var_expires as $var_name => $expires)
 		{
-			if (!empty($var_ary['is_modified']))
+			if ($expires == 'now')
 			{
-				if (!empty($var_ary['delete']))
-				{
-					$delete[] = $var_name;
-				}
-				else
-				{
-					$delete[] = $var_name;
-					$insert[] = "'$var_name', " . time() . ", '" . $db->sql_escape(serialize($var_ary['data'])) . "'";
-				}
-
-				$this->vars[$var_name]['is_modified'] = FALSE;
+				$delete[] = $var_name;
+			}
+			else
+			{
+				$delete[] = $var_name;
+				$insert[] = "'$var_name', $expires, '" . $db->sql_escape(serialize($this->vars[$var_name])) . "'";
 			}
 		}
+		$this->var_expires = array();
 
 		if (count($delete))
 		{
@@ -85,7 +97,8 @@ class acm
 			switch (SQL_LAYER)
 			{
 				case 'mysql':
-					$sql = 'INSERT INTO ' . CACHE_TABLE . ' (var_name, var_ts, var_data)
+				case 'mysql4':
+					$sql = 'INSERT INTO ' . CACHE_TABLE . ' (var_name, var_expires, var_data)
 						VALUES (' . implode('), (', $insert) . ')';
 					$db->sql_query($sql);
 				break;
@@ -93,70 +106,114 @@ class acm
 				default:
 					foreach ($insert as $values)
 					{
-						$sql = 'INSERT INTO ' . CACHE_TABLE . " (var_name, var_ts, var_data)
+						$sql = 'INSERT INTO ' . CACHE_TABLE . " (var_name, var_expires, var_data)
 							VALUES ($values)";
 						$db->sql_query($sql);
 					}
 			}
 		}
-
-		$this->is_modified = FALSE;
 	}
 
-	function tidy($max_age = 0)
+	function tidy()
 	{
 		global $db;
 
 		$sql = 'DELETE FROM ' . CACHE_TABLE . '
-			WHERE var_ts < ' . (time() - $max_age);
+			WHERE var_expires < ' . time();
 		$db->sql_query($sql);
 	}
 
-	function get($var_name, $max_age = 0)
+	function get($var_name)
 	{
-		return ($this->exists($var_name, $max_age)) ? $this->vars[$var_name]['data'] : NULL;
+		if (!is_array($this->vars))
+		{
+			$this->load();
+		}
+
+		if ($var_name{0} == '_')
+		{
+			if (!in_array($this->var_requested, $var_name))
+			{
+				$this->var_requested[] = $var_name;
+
+				global $db;
+				$sql = 'SELECT var_data
+					FROM ' . CACHE_TABLE . "
+					WHERE var_name = '$var_name'
+						AND var_expires > " . time();
+				$result = $db->sql_query($sql);
+				if ($row = $db->sql_fetchrow($result))
+				{
+					$this->vars[$var_name] = $row['var_data'];
+				}
+			}
+		}
+
+		if ($this->exists($var_name))
+		{
+			if (empty($this->var_ready[$var_name]))
+			{
+				$this->vars[$var_name] = unserialize($this->vars[$var_name]);
+				$this->var_ready[$var_name] = TRUE;
+			}
+
+			return $this->vars[$var_name];
+		}
+		else
+		{
+			return NULL;
+		}
 	}
 
-	function put($var_name, $var_data)
+	function put($var_name, $var_data, $ttl = 31536000)
 	{
-		$this->vars[$var_name] = array(
-			'data'			=>	$var_data,
-			'ts'				=>	time(),
-			'is_modified'	=>	TRUE
-		);
+		$this->vars[$var_name] = $var_data;
+
+		if ($var_name{0} == '_')
+		{
+			global $db;
+
+			switch (SQL_LAYER)
+			{
+				case 'mysql':
+				case 'mysql4':
+					$INSERT = 'REPLACE';
+				break;
+			
+				default:
+					$sql = 'DELETE FROM ' . CACHE_TABLE . "
+						WHERE var_name = '$var_name'";
+					$db->sql_query($sql);
+
+					$INSERT = 'INSERT';
+			}
 
-		$this->is_modified = TRUE;
+			$sql = "$INSERT INTO " . CACHE_TABLE . " (var_name, var_expires, var_data)
+				VALUES ('$var_name', " . (time() + $ttl) . ", '" . $db->sql_escape(serialize($var_data)) . "')";
+			$db->sql_query($sql);
+		}
+		else
+		{
+			$this->var_expires[$var_name] = time() + $ttl;
+		}
 	}
 
 	function destroy($var_name, $void = NULL)
 	{
 		if (isset($this->vars[$var_name]))
 		{
-			$this->is_modified = TRUE;
-
-			$this->vars[$var_name] = array(
-				'is_modified'	=>	TRUE,
-				'delete'			=>	TRUE
-			);
+			$this->var_expires[$var_name] = 'now';
+			unset($this->vars[$var_name]);
 		}
 	}
 
-	function exists($var_name, $max_age = 0)
+	function exists($var_name)
 	{
 		if (!is_array($this->vars))
 		{
 			$this->load();
 		}
 
-		if ($max_age > 0 && isset($this->vars[$var_name]))
-		{
-			if ($this->vars[$var_name]['ts'] + $max_age < time())
-			{
-				$this->destroy($var_name);
-				return FALSE;
-			}
-		}
-
 		return isset($this->vars[$var_name]);
 	}
 }
diff --git a/phpBB/includes/acm/acm_file.php b/phpBB/includes/acm/acm_file.php
index 02f42a6f95..6a3d6335a9 100644
--- a/phpBB/includes/acm/acm_file.php
+++ b/phpBB/includes/acm/acm_file.php
@@ -14,7 +14,7 @@
 class acm
 {
 	var $vars = '';
-	var $vars_ts = array();
+	var $var_expires = array();
 	var $is_modified = FALSE;
 
 	var $sql_rowset = array();
@@ -35,7 +35,7 @@ class acm
 	{
 		$this->save();
 		unset($this->vars);
-		unset($this->vars_ts);
+		unset($this->var_expires);
 		unset($this->sql_rowset);
 	}
 
@@ -47,7 +47,7 @@ class acm
 		}
 
 		global $phpEx;
-		$file = '<?php $this->vars=' . $this->format_array($this->vars) . ";\n\$this->vars_ts=" . $this->format_array($this->vars_ts) . ' ?>';
+		$file = '<?php $this->vars=' . $this->format_array($this->vars) . ";\n\$this->var_expires=" . $this->format_array($this->var_expires) . ' ?>';
 
 		if ($fp = @fopen($this->cache_dir . 'data_global.' . $phpEx, 'wb'))
 		{
@@ -60,19 +60,21 @@ class acm
 		$this->is_modified = FALSE;
 	}
 
-	function tidy($max_age = 0)
+	function tidy()
 	{
 		global $phpEx;
 
 		$dir = opendir($this->cache_dir);
 		while ($entry = readdir($dir))
 		{
-			if (substr($entry, 0, 4) != 'sql_')
+			if (!preg_match('/^(sql_|data_(?!global))/', $entry))
 			{
 				continue;
 			}
 
-			if (time() > filemtime($this->cache_dir . $entry) + $max_age)
+			$expired = TRUE;
+			include($this->cache_dir . $entry);
+			if ($expired)
 			{
 				unlink($this->cache_dir . $entry);
 			}
@@ -81,35 +83,62 @@ class acm
 
 		if (file_exists($this->cache_dir . 'data_global.' . $phpEx))
 		{
-			foreach ($this->vars_ts as $var_name => $timestamp)
+			if (!is_array($this->vars))
 			{
-				if (time() > $timestamp + $max_age)
+				$this->load();
+			}
+
+			foreach ($this->var_expires as $var_name => $expires)
+			{
+				if (time() > $expires)
 				{
 					$this->destroy($var_name);
 				}
 			}
 		}
+	}
+
+	function get($var_name)
+	{
+		if ($var_name{0} == '_')
+		{
+			global $phpEx;
+
+			include($this->cache_dir . 'data' . $var_name . ".$phpEx");
+			return (isset($data)) ? $data : NULL;
+		}
 		else
 		{
-			$this->vars = $this->vars_ts = array();
-			$this->is_modified = TRUE;
+			return ($this->exists($var_name)) ? $this->vars[$var_name] : NULL;
 		}
 	}
 
-	function get($var_name, $max_age = 0)
+	function put($var_name, $var, $ttl = 31536000)
 	{
-		return ($this->exists($var_name, $max_age)) ? $this->vars[$var_name] : NULL;
-	}
+		if ($var_name{0} == '_')
+		{
+			global $phpEx;
 
-	function put($var_name, $var)
-	{
-		$this->vars[$var_name] = $var;
-		$this->vars_ts[$var_name] = time();
-		$this->is_modified = TRUE;
+			if ($fp = @fopen($this->cache_dir . 'data' . $var_name . ".$phpEx", 'wb'))
+			{
+				@flock($fp, LOCK_EX);
+				fwrite($fp, "<?php\n\$expired = (time() > " . (time() + $ttl) . ") ? TRUE : FALSE;\nif (\$expired) { return; }\n\n\$data = unserialize('" . str_replace("'", "\\'", str_replace('\\', '\\\\', serialize($var))) . "');\n?>");
+				@flock($fp, LOCK_UN);
+				fclose($fp);
+			}
+		}
+		else
+		{
+			$this->vars[$var_name] = $var;
+			$this->var_expires[$var_name] = time() + $ttl;
+			$this->is_modified = TRUE;
+		}
 	}
 
 	function destroy($var_name, $table = '')
 	{
+		global $phpEx;
+
 		if ($var_name == 'sql' && !empty($table))
 		{
 			$regex = '(' . ((is_array($table)) ? implode('|', $table) : $table) . ')';
@@ -133,31 +162,34 @@ class acm
 			}
 			@closedir($dir);
 		}
+		elseif ($var_name{0} == '_')
+		{
+			@unlink($this->cache_dir . 'data' . $var_name . ".$phpEx");
+		}
 		elseif (isset($this->vars[$var_name]))
 		{
 			$this->is_modified = TRUE;
 			unset($this->vars[$var_name]);
-			unset($this->vars_ts[$var_name]);
+			unset($this->var_expires[$var_name]);
 		}
 	}
 
-	function exists($var_name, $max_age = 0)
+	function exists($var_name)
 	{
-		if (!is_array($this->vars))
+		if ($var_name{0} == '_')
 		{
-			$this->load();
+			global $phpEx;
+			return file_exists($this->cache_dir . 'data' . $var_name . ".$phpEx");
 		}
-
-		if ($max_age > 0 && isset($this->vars_ts[$var_name]))
+		else
 		{
-			if (time() > $this->vars_ts[$var_name] + $max_age)
+			if (!is_array($this->vars))
 			{
-				$this->destroy($var_name);
-				return FALSE;
+				$this->load();
 			}
-		}
 
-		return isset($this->vars[$var_name]);
+			return (time() > $this->var_expires[$var_name]) ? FALSE : isset($this->vars[$var_name]);
+		}
 	}
 
 	function format_array($array)
@@ -179,34 +211,35 @@ class acm
 			}
 			else
 			{
-				$lines[] = "'$k'=>'" . str_replace("'", "\'", str_replace('\\', '\\\\', $v)) . "'";
+				$lines[] = "'$k'=>'" . str_replace("'", "\\'", str_replace('\\', '\\\\', $v)) . "'";
 			}
 		}
 		return 'array(' . implode(',', $lines) . ')';
 	}
 
-	function sql_load($query, $max_age)
+	function sql_load($query)
 	{
 		global $phpEx;
 
 		// Remove extra spaces and tabs
 		$query = preg_replace('/[\n\r\s\t]+/', ' ', $query);
+		$query_id = 'Cache id #' . count($this->sql_rowset);
 
-		$filemtime = intval(@filemtime($this->cache_dir . 'sql_' . md5($query) . '.' . $phpEx));
-		if (time() > $filemtime + $max_age)
+		include($this->cache_dir . 'sql_' . md5($query) . ".$phpEx");
+		if (!isset($expired))
 		{
 			return FALSE;
 		}
-
-		$query_id = 'Cache id #' . count($this->sql_rowset);
-		include($this->cache_dir . 'sql_' . md5($query) . '.' . $phpEx);
-
-//		$this->sql_rowset[$query_id] =& $rowset;
+		elseif ($expired)
+		{
+			unlink($this->cache_dir . 'sql_' . md5($query) . ".$phpEx");
+			return FALSE;
+		}
 
 		return $query_id;
 	}
 
-	function sql_save($query, &$query_result)
+	function sql_save($query, &$query_result, $ttl)
 	{
 		global $db, $phpEx;
 
@@ -225,15 +258,11 @@ class acm
 			{
 				$this->sql_rowset[$query_id][] = $row;
 
-				$line = 'array(';
-				foreach ($row as $key => $val)
-				{
-					$line .= "'$key'=>'" . str_replace("'", "\'", str_replace('\\', '\\\\', $val)) . "',";
-				}
-				$lines[] = substr($line, 0, -1) . ')';
+				$lines[] = "unserialize('" . str_replace("'", "\\'", str_replace('\\', '\\\\', serialize($row))) . "')";
 			}
+			$db->sql_freeresult($query_result);
 
-			fwrite($fp, "<?php\n\n/*\n$query\n*/\n\n\$this->sql_rowset[\$query_id] = array(" . implode(',', $lines) . ') ?>');
+			fwrite($fp, "<?php\n\n/*\n$query\n*/\n\n\$expired = (time() > " . (time() + $ttl) . ") ? TRUE : FALSE;\nif (\$expired) { return; }\n\n\$this->sql_rowset[\$query_id] = array(" . implode(',', $lines) . ') ?>');
 			@flock($fp, LOCK_UN);
 			fclose($fp);
author	Ludovic Arnaud <ludovic_arnaud@users.sourceforge.net>	2003-11-26 23:34:33 +0000
committer	Ludovic Arnaud <ludovic_arnaud@users.sourceforge.net>	2003-11-26 23:34:33 +0000
commit	ac0b5d79ad4c6b7d1e9bf52763918f1e0017b9a0 (patch)
tree	ae435d9e1fe6180d9bed855c8f72b01ab3215d1a /phpBB/includes/acm
parent	1dd9ad2f79c5d3e26705ea21396456d346c42c30 (diff)
download	forums-ac0b5d79ad4c6b7d1e9bf52763918f1e0017b9a0.tar forums-ac0b5d79ad4c6b7d1e9bf52763918f1e0017b9a0.tar.gz forums-ac0b5d79ad4c6b7d1e9bf52763918f1e0017b9a0.tar.bz2 forums-ac0b5d79ad4c6b7d1e9bf52763918f1e0017b9a0.tar.xz forums-ac0b5d79ad4c6b7d1e9bf52763918f1e0017b9a0.zip