add profile support

src/main/java/com/alibaba/druid/support/profile/ProfileEntry.java

@@ -0,0 +1,42 @@
+package com.alibaba.druid.support.profile;
+
+public class ProfileEntry {
+
+    private final Key    key;
+    private final String type;
+
+    public ProfileEntry(Key key, String type){
+        super();
+        this.key = key;
+        this.type = type;
+    }
+
+    public Key getKey() {
+        return key;
+    }
+
+    public String getType() {
+        return type;
+    }
+
+    public static class Key {
+
+        private String parent;
+        private String name;
+
+        public Key(String parentName, String name){
+            super();
+            this.parent = parentName;
+            this.name = name;
+        }
+
+        public String getParent() {
+            return parent;
+        }
+
+        public String getName() {
+            return name;
+        }
+
+    }
+}

src/main/java/com/alibaba/druid/support/profile/Profiler.java

@@ -0,0 +1,59 @@
+package com.alibaba.druid.support.profile;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import com.alibaba.druid.support.profile.ProfileEntry.Key;
+
+public class Profiler {
+
+    public static ThreadLocal<Boolean>                              enableLocal    = new ThreadLocal<Boolean>();
+
+    private static ThreadLocal<Map<ProfileEntry.Key, ProfileEntry>> entriesLocal = new ThreadLocal<Map<Key, ProfileEntry>>();
+
+    private final static ThreadLocal<ProfileEntry>                  currentLocal   = new ThreadLocal<ProfileEntry>();
+
+    public static void setThreadLocalEnable() {
+        enableLocal.set(true);
+    }
+
+    public static void setThreadLocalDisable() {
+        enableLocal.remove();
+    }
+
+    public static boolean isEnable() {
+        return Boolean.TRUE == enableLocal.get();
+    }
+
+    public static void enter(String name, String type, long startNano) {
+        ProfileEntry parent = currentLocal.get();
+        String parentName = null;
+        if (parent != null) {
+            parentName = parent.getKey().getName();
+        }
+        
+        ProfileEntry.Key key = new ProfileEntry.Key(parentName, name);
+        
+        Map<ProfileEntry.Key, ProfileEntry> entries = entriesLocal.get();
+        if (entries == null) {
+            entries = new HashMap<ProfileEntry.Key, ProfileEntry>();
+            entriesLocal.set(entries);
+        }
+        
+        ProfileEntry entry = entries.get(key);
+        if (entry == null) {
+            entry = new ProfileEntry(key, type);
+            entries.put(key, entry);
+        }
+        
+        currentLocal.set(entry);
+    }
+
+    public static ProfileEntry current() {
+        return currentLocal.get();
+    }
+
+    public static void release(long nanoSpan) {
+
+    }
+}