initial import

core/prof/profiler.go

@@ -0,0 +1,58 @@
+package prof
+
+import "zero/core/utils"
+
+type (
+	ProfilePoint struct {
+		*utils.ElapsedTimer
+	}
+
+	Profiler interface {
+		Start() ProfilePoint
+		Report(name string, point ProfilePoint)
+	}
+
+	RealProfiler struct{}
+
+	NullProfiler struct{}
+)
+
+var profiler = newNullProfiler()
+
+func EnableProfiling() {
+	profiler = newRealProfiler()
+}
+
+func Start() ProfilePoint {
+	return profiler.Start()
+}
+
+func Report(name string, point ProfilePoint) {
+	profiler.Report(name, point)
+}
+
+func newRealProfiler() Profiler {
+	return &RealProfiler{}
+}
+
+func (rp *RealProfiler) Start() ProfilePoint {
+	return ProfilePoint{
+		ElapsedTimer: utils.NewElapsedTimer(),
+	}
+}
+
+func (rp *RealProfiler) Report(name string, point ProfilePoint) {
+	duration := point.Duration()
+	report(name, duration)
+}
+
+func newNullProfiler() Profiler {
+	return &NullProfiler{}
+}
+
+func (np *NullProfiler) Start() ProfilePoint {
+	return ProfilePoint{}
+}
+
+func (np *NullProfiler) Report(string, ProfilePoint) {
+}