Source File
	fast.go

Belonging Package
	golang.org/x/tools/internal/event/core

// Copyright 2019 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 core

import (
	"context"

	"golang.org/x/tools/internal/event/keys"
	"golang.org/x/tools/internal/event/label"
)

// Log1 takes a message and one label delivers a log event to the exporter.
// It is a customized version of Print that is faster and does no allocation.
func Log1(ctx context.Context, message string, t1 label.Label) {
	Export(ctx, MakeEvent([3]label.Label{
		keys.Msg.Of(message),
		t1,
	}, nil))
}

// Log2 takes a message and two labels and delivers a log event to the exporter.
// It is a customized version of Print that is faster and does no allocation.
func Log2(ctx context.Context, message string, t1 label.Label, t2 label.Label) {
	Export(ctx, MakeEvent([3]label.Label{
		keys.Msg.Of(message),
		t1,
		t2,
	}, nil))
}

// Metric1 sends a label event to the exporter with the supplied labels.
func Metric1(ctx context.Context, t1 label.Label) context.Context {
	return Export(ctx, MakeEvent([3]label.Label{
		keys.Metric.New(),
		t1,
	}, nil))
}

// Metric2 sends a label event to the exporter with the supplied labels.
func Metric2(ctx context.Context, t1, t2 label.Label) context.Context {
	return Export(ctx, MakeEvent([3]label.Label{
		keys.Metric.New(),
		t1,
		t2,
	}, nil))
}

// Start1 sends a span start event with the supplied label list to the exporter.
// It also returns a function that will end the span, which should normally be
// deferred.
func Start1(ctx context.Context, name string, t1 label.Label) (context.Context, func()) {
	return ExportPair(ctx,
		MakeEvent([3]label.Label{
			keys.Start.Of(name),
			t1,
		}, nil),
		MakeEvent([3]label.Label{
			keys.End.New(),
		}, nil))
}

// Start2 sends a span start event with the supplied label list to the exporter.
// It also returns a function that will end the span, which should normally be
// deferred.
func Start2(ctx context.Context, name string, t1, t2 label.Label) (context.Context, func()) {
	return ExportPair(ctx,
		MakeEvent([3]label.Label{
			keys.Start.Of(name),
			t1,
			t2,
		}, nil),
		MakeEvent([3]label.Label{
			keys.End.New(),
		}, nil))
}

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