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// Copyright 2020 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package event_test
import (
"context"
"io"
"log"
"testing"
"golang.org/x/tools/internal/event"
"golang.org/x/tools/internal/event/core"
"golang.org/x/tools/internal/event/export"
"golang.org/x/tools/internal/event/keys"
"golang.org/x/tools/internal/event/label"
)
type Hooks struct {
A func(ctx context.Context, a int) (context.Context, func())
B func(ctx context.Context, b string) (context.Context, func())
}
var (
aValue = keys.NewInt("a", "")
bValue = keys.NewString("b", "")
aCount = keys.NewInt64("aCount", "Count of time A is called.")
aStat = keys.NewInt("aValue", "A value.")
bCount = keys.NewInt64("B", "Count of time B is called.")
bLength = keys.NewInt("BLen", "B length.")
Baseline = Hooks{
A: func(ctx context.Context, a int) (context.Context, func()) {
return ctx, func() {}
},
B: func(ctx context.Context, b string) (context.Context, func()) {
return ctx, func() {}
},
}
StdLog = Hooks{
A: func(ctx context.Context, a int) (context.Context, func()) {
log.Printf("A where a=%d", a)
return ctx, func() {}
},
B: func(ctx context.Context, b string) (context.Context, func()) {
log.Printf("B where b=%q", b)
return ctx, func() {}
},
}
Log = Hooks{
A: func(ctx context.Context, a int) (context.Context, func()) {
core.Log1(ctx, "A", aValue.Of(a))
return ctx, func() {}
},
B: func(ctx context.Context, b string) (context.Context, func()) {
core.Log1(ctx, "B", bValue.Of(b))
return ctx, func() {}
},
}
Trace = Hooks{
A: func(ctx context.Context, a int) (context.Context, func()) {
return core.Start1(ctx, "A", aValue.Of(a))
},
B: func(ctx context.Context, b string) (context.Context, func()) {
return core.Start1(ctx, "B", bValue.Of(b))
},
}
Stats = Hooks{
A: func(ctx context.Context, a int) (context.Context, func()) {
core.Metric1(ctx, aStat.Of(a))
core.Metric1(ctx, aCount.Of(1))
return ctx, func() {}
},
B: func(ctx context.Context, b string) (context.Context, func()) {
core.Metric1(ctx, bLength.Of(len(b)))
core.Metric1(ctx, bCount.Of(1))
return ctx, func() {}
},
}
initialList = []int{0, 1, 22, 333, 4444, 55555, 666666, 7777777}
stringList = []string{
"A value",
"Some other value",
"A nice longer value but not too long",
"V",
"",
"ı",
"prime count of values",
}
)
type namedBenchmark struct {
name string
test func(*testing.B)
}
func Benchmark(b *testing.B) {
b.Run("Baseline", Baseline.runBenchmark)
b.Run("StdLog", StdLog.runBenchmark)
benchmarks := []namedBenchmark{
{"Log", Log.runBenchmark},
{"Trace", Trace.runBenchmark},
{"Stats", Stats.runBenchmark},
}
event.SetExporter(nil)
for _, t := range benchmarks {
b.Run(t.name+"NoExporter", t.test)
}
event.SetExporter(noopExporter)
for _, t := range benchmarks {
b.Run(t.name+"Noop", t.test)
}
event.SetExporter(export.Spans(export.LogWriter(io.Discard, false)))
for _, t := range benchmarks {
b.Run(t.name, t.test)
}
}
func A(ctx context.Context, hooks Hooks, a int) int {
ctx, done := hooks.A(ctx, a)
defer done()
return B(ctx, hooks, a, stringList[a%len(stringList)])
}
func B(ctx context.Context, hooks Hooks, a int, b string) int {
_, done := hooks.B(ctx, b)
defer done()
return a + len(b)
}
func (hooks Hooks) runBenchmark(b *testing.B) {
ctx := context.Background()
b.ReportAllocs()
b.ResetTimer()
var acc int
for i := 0; i < b.N; i++ {
for _, value := range initialList {
acc += A(ctx, hooks, value)
}
}
}
func init() {
log.SetOutput(io.Discard)
}
func noopExporter(ctx context.Context, ev core.Event, lm label.Map) context.Context {
return ctx
}
|
