Generate build timing metrics to proto format file
Test: Dumped the text formated based metrics file to out dir,
and checked the file.
Bug: b/63815990
Change-Id: Iff476f72a0be74eb53b6b26ef468d11c0f24a404
diff --git a/ui/metrics/time.go b/ui/metrics/time.go
new file mode 100644
index 0000000..7e8801a
--- /dev/null
+++ b/ui/metrics/time.go
@@ -0,0 +1,71 @@
+// Copyright 2018 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package metrics
+
+import (
+ "time"
+
+ "android/soong/ui/metrics/metrics_proto"
+ "android/soong/ui/tracer"
+)
+
+type timeEvent struct {
+ desc string
+ name string
+
+ atNanos uint64 // timestamp measured in nanoseconds since the reference date
+}
+
+type TimeTracer interface {
+ Begin(name, desc string, thread tracer.Thread)
+ End(thread tracer.Thread) metrics_proto.PerfInfo
+}
+
+type timeTracerImpl struct {
+ activeEvents []timeEvent
+}
+
+var _ TimeTracer = &timeTracerImpl{}
+
+func (t *timeTracerImpl) now() uint64 {
+ return uint64(time.Now().UnixNano())
+}
+
+func (t *timeTracerImpl) Begin(name, desc string, thread tracer.Thread) {
+ t.beginAt(name, desc, t.now())
+}
+
+func (t *timeTracerImpl) beginAt(name, desc string, atNanos uint64) {
+ t.activeEvents = append(t.activeEvents, timeEvent{name: name, desc: desc, atNanos: atNanos})
+}
+
+func (t *timeTracerImpl) End(thread tracer.Thread) metrics_proto.PerfInfo {
+ return t.endAt(t.now())
+}
+
+func (t *timeTracerImpl) endAt(atNanos uint64) metrics_proto.PerfInfo {
+ if len(t.activeEvents) < 1 {
+ panic("Internal error: No pending events for endAt to end!")
+ }
+ lastEvent := t.activeEvents[len(t.activeEvents)-1]
+ t.activeEvents = t.activeEvents[:len(t.activeEvents)-1]
+ realTime := atNanos - lastEvent.atNanos
+
+ return metrics_proto.PerfInfo{
+ Desc: &lastEvent.desc,
+ Name: &lastEvent.name,
+ StartTime: &lastEvent.atNanos,
+ RealTime: &realTime}
+}