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// 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}
}
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