vendor/go.opencensus.io/stats/view/view.go

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// Copyright 2017, OpenCensus Authors
//
// 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 view

import (
	"bytes"
	"errors"
	"fmt"
	"reflect"
	"sort"
	"sync/atomic"
	"time"

	"go.opencensus.io/metric/metricdata"
	"go.opencensus.io/stats"
	"go.opencensus.io/tag"
)

// View allows users to aggregate the recorded stats.Measurements.
// Views need to be passed to the Register function before data will be
// collected and sent to Exporters.
type View struct {
	Name        string // Name of View. Must be unique. If unset, will default to the name of the Measure.
	Description string // Description is a human-readable description for this view.

	// TagKeys are the tag keys describing the grouping of this view.
	// A single Row will be produced for each combination of associated tag values.
	TagKeys []tag.Key

	// Measure is a stats.Measure to aggregate in this view.
	Measure stats.Measure

	// Aggregation is the aggregation function to apply to the set of Measurements.
	Aggregation *Aggregation
}

// WithName returns a copy of the View with a new name. This is useful for
// renaming views to cope with limitations placed on metric names by various
// backends.
func (v *View) WithName(name string) *View {
	vNew := *v
	vNew.Name = name
	return &vNew
}

// same compares two views and returns true if they represent the same aggregation.
func (v *View) same(other *View) bool {