[유치수] [NOBTS] add mysql interceptor

git-svn-id: http://svn.bds.nhncorp.com/pe/hippo-tomcat-profiler/trunk@556 84d0f5b1-2673-498c-a247-62c4ff18d310

src/main/java/com/profiler/StopWatch.java

@@ -0,0 +1,31 @@
+package com.profiler;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import com.profiler.util.NamedThreadLocal;
+
+public class StopWatch {
+
+	private static ThreadLocal<Map<String, Long>> local = new NamedThreadLocal<Map<String, Long>>("StopWatch");
+
+	public static void start(String name) {
+		Map<String, Long> map = local.get();
+		if (map == null) {
+			map = new HashMap<String, Long>(1);
+			map.put(name, System.currentTimeMillis());
+			local.set(map);
+		} else {
+			map.put(name, System.currentTimeMillis());
+		}
+	}
+
+	public static long stopAndGetElapsed(String name) {
+		Map<String, Long> map = local.get();
+		if (map == null) {
+			throw new IllegalStateException("Stopwatch is not started.");
+		} else {
+			return System.currentTimeMillis() - map.get(name);
+		}
+	}
+}