diff --git a/main.js b/main.js
index 3f7e19d..4371178 100644
--- a/main.js
+++ b/main.js
@@ -1,16 +1,21 @@
 var config = require('./config');	//include config file
 var mapnik = require('mapnik');
 var TC = require('./node-tokyocabinet/build/default/tokyocabinet');
-
 var path = require('path');
 var clutch = require('clutch');
+var mercator = require('mapnik/sphericalmercator')
+var mappool = require('mapnik/pool')
+
 //var hasher = require('crypto').createHash('md5');
 
-var async = require('async');
+//var async = require('async');
 
-var queue = async.queue(render,2);
+//var queue = async.queue(render,2);
 
-var stylesheet = path.join(__dirname,"style.xml");
+var stylesheet = path.join(__dirname,"/mapnik/osm_new.xml");
+/*var stylesheet = path.join(__dirname, "node-mapnik/examples/stylesheet.xml")*/
+
+var maps = mappool.create(2);
 
 console.log("Tokyo Cabinet version " + TC.VERSION);
 
@@ -18,10 +23,10 @@ var HDB = TC.HDB;
 
 var hdb = new HDB;
 
- if (!hdb.open('tile.tch', HDB.OWRITER | HDB.OCREAT)) {
+if (!hdb.open('tile.tch', HDB.OWRITER | HDB.OCREAT)) {
     sys.error(hdb.errmsg());
-  }
-  
+}
+
 function writeResponse(content, res) {
 	res.writeHead(200, {
                         'Content-Type': 'image/png',
@@ -32,20 +37,56 @@ function writeResponse(content, res) {
 	res.end(new Buffer(content.data,'base64'));
 
 }
+
+var acquire = function(id,options,callback) {
+    methods = {
+       create: function(cb) {
+            var obj = new mapnik.Map(256, 256);
+            try {
+                obj.load(id);
+            }
+            catch (err) {
+                callback(err,null);
+            }
+            cb(obj);
+       },
+       destroy: function(obj) {
+            obj.clear();
+            delete obj;
+       },
+       idleTimeoutMillis: 20000,
+
+    }
+    maps.acquire(id, methods, function(obj) {
+        callback(null, obj);
+    });
+}
  
   
 function render(task, callback) {
 	
-	var map = new mapnik.Map(256,256);
-    map.load(task.stylesheet+".xml");
-    map.zoom_all();
-	
-	map.render(map.extent(),function(data) {
-			
-				if(data) {
+    acquire(stylesheet,{}, function(err, map) {
+        if(err) {
+            console.log(err);
+        }
+        else {
+            console.log("map acquired\n")
+       
+    //map.zoom_to_box(tile2long(task.x,task.z),tile2lat(task.y,task.z),tile2long(task.x+1,task.z),tile2lat(task.y+1,task.z));
+    //map.zoom_all()
+    //var bbox = [tile2lat(task.y,task.z),tile2long(task.x,task.z),tile2lat(task.y-1,task.z),tile2long(task.x-1,task.z)];
+	//var bbox = [13.0882097323,52.3418234221,13.7606105539,52.6697240587]
+    //map.zoom_all()//map.zoom_to_box(extent);
+    //map.zoom_all();
+    
+    
+    var bbox = mercator.xyz_to_envelope(task.x, task.y, task.z, false)
+    map.render(bbox,"png",function(error,data) {
+		        //console.log(data)
+                console.log("tile rendered");
+				if(!error) {
 					//TODO clean up tags, different values for different tiles	
 						
-					
 					var temp = 	{
 						'data' 			:	data.toString('base64'),
 						'timestamp'		:	new Date().getTime(),
@@ -54,27 +95,31 @@ function render(task, callback) {
 					};
 					
 					writeResponse(temp,task.res)	
-					//console.log(temp.timestamp);
+					console.log(temp.data)
+                    //console.log(temp.timestamp);
 					//console.log(temp.ETag);
 					//TODO do async
-					hdb.put(task.url, JSON.stringify(temp));
+					//hdb.put(task.url, JSON.stringify(temp));
 					//hdb.put(url, data.toString('base64'));
 
 					hdb.putAsync(task.url, JSON.stringify(temp), function(err) {
 						if(err) {
 							console.log(err);
-						}	
+						}
+                        else {
+                            console.log("tile saved")
+                        }
 					});		
 				}
 				else {
+                    console.log(error.message)
 					task.res.writeHead(404, {'Content-Type': 'text/plain'});
 					task.res.end();
 				}
 				callback();
 			});
-	
-	
-	
+        }	
+	});
 } 
 
 function requestHandler(req, res, style, z, x, y) {
@@ -88,31 +133,32 @@ function requestHandler(req, res, style, z, x, y) {
 				'url' : url,
 				'res' : res,
 				'stylesheet' : style,
-				'z' : z,
-				'x' : x,
-				'y' : y
+				'z' : parseInt(z),
+				'x' : parseInt(x),
+				'y' : parseInt(y)
 				};
 				
-			queue.push(renderTask, function() {});
+			//queue.push(renderTask, function() {});
 			//var data = map.render_to_string();
-            
+            render(renderTask,function() {});
 		}
 		else {
 			//console.log(value);
 			var content = JSON.parse(value);
 			//TODO changeable expire time... 1000*60*60*24 = one day
-			if((new Date().getTime() - content.timestamp) > 1000*30) {
+			if((new Date().getTime() - content.timestamp) > 1000*60*60) {
 				//rerender
 				var renderTask = {
                 'url' : url,
                 'res' : res,
                 'stylesheet' : style,
-                'z' : z,
-                'x' : x,
-                'y' : y
+                'z' : parseInt(z),
+                'x' : parseInt(x),
+                'y' : parseInt(y)
                 };
 				//response is send in render function
-				queue.push(renderTask, function() {});
+                /*queue.push(renderTask, function() {});*/
+                render(renderTask,function() {});
 			} 
 			else {
 				//tile is not expired