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