diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 5a9a65e..81f65c1 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -5,16 +5,8 @@
   </component>
   <component name="ChangeListManager">
     <list default="true" readonly="true" id="03ed5703-81a1-441b-849c-c426276586b7" name="Default" comment="">
-      <change type="NEW" beforePath="" afterPath="$PROJECT_DIR$/base_context.go" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/cache_db.go" afterPath="$PROJECT_DIR$/cache_db.go" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/cache_memory.go" afterPath="$PROJECT_DIR$/cache_memory.go" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/config/config.json" afterPath="$PROJECT_DIR$/config/config.json" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/context.go" afterPath="$PROJECT_DIR$/context.go" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/db.go" afterPath="$PROJECT_DIR$/db.go" />
       <change type="MODIFICATION" beforePath="$PROJECT_DIR$/example/main.go" afterPath="$PROJECT_DIR$/example/main.go" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/obj.go" afterPath="$PROJECT_DIR$/obj.go" />
-      <change type="MODIFICATION" beforePath="$PROJECT_DIR$/session.go" afterPath="$PROJECT_DIR$/session.go" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="TRACKING_ENABLED" value="true" />
@@ -36,11 +28,11 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="context.go" pinned="false" current-in-tab="true">
+      <file leaf-file-name="context.go" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/context.go">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="425">
-              <caret line="40" column="16" lean-forward="false" selection-start-line="40" selection-start-column="16" selection-end-line="40" selection-end-column="16" />
+            <state relative-caret-position="510">
+              <caret line="30" column="0" lean-forward="true" selection-start-line="30" selection-start-column="0" selection-end-line="30" selection-end-column="0" />
               <folding>
                 <element signature="e#16#65#0" expanded="true" />
                 <marker date="1503454050929" expanded="true" signature="715:832" ph="{...}" />
@@ -59,6 +51,16 @@
           </provider>
         </entry>
       </file>
+      <file leaf-file-name="config.json" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/config/config.json">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="238">
+              <caret line="14" column="17" lean-forward="false" selection-start-line="14" selection-start-column="17" selection-end-line="14" selection-end-column="17" />
+              <folding />
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file leaf-file-name="func.go" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/func.go">
           <provider selected="true" editor-type-id="text-editor">
@@ -69,6 +71,18 @@
           </provider>
         </entry>
       </file>
+      <file leaf-file-name="main.go" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/example/main.go">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="289">
+              <caret line="56" column="28" lean-forward="false" selection-start-line="56" selection-start-column="28" selection-end-line="56" selection-end-column="28" />
+              <folding>
+                <element signature="e#14#137#0" expanded="true" />
+              </folding>
+            </state>
+          </provider>
+        </entry>
+      </file>
       <file leaf-file-name="map.go" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/map.go">
           <provider selected="true" editor-type-id="text-editor">
@@ -111,26 +125,6 @@
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="slice.go" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/slice.go">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="799">
-              <caret line="48" column="0" lean-forward="false" selection-start-line="48" selection-start-column="0" selection-end-line="48" selection-end-column="0" />
-              <folding />
-            </state>
-          </provider>
-        </entry>
-      </file>
-      <file leaf-file-name="type.go" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/type.go">
-          <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="102">
-              <caret line="6" column="0" lean-forward="false" selection-start-line="6" selection-start-column="0" selection-end-line="6" selection-end-column="0" />
-              <folding />
-            </state>
-          </provider>
-        </entry>
-      </file>
     </leaf>
   </component>
   <component name="FileTemplateManagerImpl">
@@ -169,8 +163,6 @@
         <option value="$PROJECT_DIR$/example/tpt/index.html" />
         <option value="$PROJECT_DIR$/application.go" />
         <option value="$PROJECT_DIR$/base.go" />
-        <option value="$PROJECT_DIR$/config/config.json" />
-        <option value="$PROJECT_DIR$/example/main.go" />
         <option value="$PROJECT_DIR$/base_context.go" />
         <option value="$PROJECT_DIR$/db.go" />
         <option value="$PROJECT_DIR$/cache_db.go" />
@@ -178,6 +170,8 @@
         <option value="$PROJECT_DIR$/obj.go" />
         <option value="$PROJECT_DIR$/session.go" />
         <option value="$PROJECT_DIR$/context.go" />
+        <option value="$PROJECT_DIR$/example/main.go" />
+        <option value="$PROJECT_DIR$/config/config.json" />
       </list>
     </option>
   </component>
@@ -288,6 +282,92 @@
               <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
             </PATH_ELEMENT>
           </PATH>
+          <PATH>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="hotime" />
+              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="External Libraries" />
+              <option name="myItemType" value="com.jetbrains.php.config.library.PhpExternalLibrariesNodePatcher$PatchedExternalLibrariesNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="GOPATH &lt;hotime&gt;" />
+              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.NamedLibraryElementNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="go.hoteas.com" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="hotime" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="example" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="tpt" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+          </PATH>
+          <PATH>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="hotime" />
+              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="External Libraries" />
+              <option name="myItemType" value="com.jetbrains.php.config.library.PhpExternalLibrariesNodePatcher$PatchedExternalLibrariesNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="GOPATH &lt;hotime&gt;" />
+              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.NamedLibraryElementNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="go.hoteas.com" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="hotime" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="example" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="config" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+          </PATH>
+          <PATH>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="hotime" />
+              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.ProjectViewProjectNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="External Libraries" />
+              <option name="myItemType" value="com.jetbrains.php.config.library.PhpExternalLibrariesNodePatcher$PatchedExternalLibrariesNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="GOPATH &lt;hotime&gt;" />
+              <option name="myItemType" value="com.intellij.ide.projectView.impl.nodes.NamedLibraryElementNode" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="go.hoteas.com" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="hotime" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+            <PATH_ELEMENT>
+              <option name="myItemId" value="config" />
+              <option name="myItemType" value="com.jetbrains.php.projectView.PhpTreeStructureProvider$1" />
+            </PATH_ELEMENT>
+          </PATH>
           <PATH>
             <PATH_ELEMENT>
               <option name="myItemId" value="hotime" />
@@ -557,7 +637,7 @@
       <workItem from="1502760226287" duration="153000" />
       <workItem from="1502935911308" duration="1724000" />
       <workItem from="1503366689326" duration="2378000" />
-      <workItem from="1503451223794" duration="2825000" />
+      <workItem from="1503451223794" duration="2965000" />
     </task>
     <task id="LOCAL-00001">
       <created>1500458878821</created>
@@ -664,11 +744,18 @@
       <option name="project" value="LOCAL" />
       <updated>1503452484959</updated>
     </task>
-    <option name="localTasksCounter" value="16" />
+    <task id="LOCAL-00016" summary="demo">
+      <created>1503454064456</created>
+      <option name="number" value="00016" />
+      <option name="presentableId" value="LOCAL-00016" />
+      <option name="project" value="LOCAL" />
+      <updated>1503454064456</updated>
+    </task>
+    <option name="localTasksCounter" value="17" />
     <servers />
   </component>
   <component name="TimeTrackingManager">
-    <option name="totallyTimeSpent" value="61082000" />
+    <option name="totallyTimeSpent" value="61222000" />
   </component>
   <component name="TodoView">
     <todo-panel id="selected-file">
@@ -971,24 +1058,6 @@
         </state>
       </provider>
     </entry>
-    <entry file="file://$PROJECT_DIR$/config/config.json">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="238">
-          <caret line="14" column="17" lean-forward="false" selection-start-line="14" selection-start-column="17" selection-end-line="14" selection-end-column="17" />
-          <folding />
-        </state>
-      </provider>
-    </entry>
-    <entry file="file://$PROJECT_DIR$/example/main.go">
-      <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="459">
-          <caret line="66" column="29" lean-forward="true" selection-start-line="66" selection-start-column="29" selection-end-line="66" selection-end-column="29" />
-          <folding>
-            <element signature="e#14#137#0" expanded="true" />
-          </folding>
-        </state>
-      </provider>
-    </entry>
     <entry file="file://$PROJECT_DIR$/base_context.go">
       <provider selected="true" editor-type-id="text-editor">
         <state relative-caret-position="85">
@@ -1107,10 +1176,18 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/config/config.json">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="238">
+          <caret line="14" column="17" lean-forward="false" selection-start-line="14" selection-start-column="17" selection-end-line="14" selection-end-column="17" />
+          <folding />
+        </state>
+      </provider>
+    </entry>
     <entry file="file://$PROJECT_DIR$/context.go">
       <provider selected="true" editor-type-id="text-editor">
-        <state relative-caret-position="425">
-          <caret line="40" column="16" lean-forward="false" selection-start-line="40" selection-start-column="16" selection-end-line="40" selection-end-column="16" />
+        <state relative-caret-position="510">
+          <caret line="30" column="0" lean-forward="true" selection-start-line="30" selection-start-column="0" selection-end-line="30" selection-end-column="0" />
           <folding>
             <element signature="e#16#65#0" expanded="true" />
             <marker date="1503454050929" expanded="true" signature="715:832" ph="{...}" />
@@ -1118,5 +1195,15 @@
         </state>
       </provider>
     </entry>
+    <entry file="file://$PROJECT_DIR$/example/main.go">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="289">
+          <caret line="56" column="28" lean-forward="false" selection-start-line="56" selection-start-column="28" selection-end-line="56" selection-end-column="28" />
+          <folding>
+            <element signature="e#14#137#0" expanded="true" />
+          </folding>
+        </state>
+      </provider>
+    </entry>
   </component>
 </project>
\ No newline at end of file
diff --git a/example/main.go b/example/main.go
index d6b1789..1808146 100644
--- a/example/main.go
+++ b/example/main.go
@@ -54,7 +54,7 @@ func main() {
 
 						return true
 					})
-					this.Display(0, "chenggong")
+					this.Display(5, "chenggong")
 				},
 				"websocket": func(this *hotime.Context) {
 					hdler := websocket.Handler(func(ws *websocket.Conn) {