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/*
* Copyright 2024 gRPC 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 stats
import "maps"
// MetricSet is a set of metrics to record. Once created, MetricSet is immutable,
// however Add and Remove can make copies with specific metrics added or
// removed, respectively.
//
// Do not construct directly; use NewMetricSet instead.
type MetricSet struct {
// metrics are the set of metrics to initialize.
metrics map[string]bool
}
// NewMetricSet returns a MetricSet containing metricNames.
func NewMetricSet(metricNames ...string) *MetricSet {
newMetrics := make(map[string]bool)
for _, metric := range metricNames {
newMetrics[metric] = true
}
return &MetricSet{metrics: newMetrics}
}
// Metrics returns the metrics set. The returned map is read-only and must not
// be modified.
func (m *MetricSet) Metrics() map[string]bool {
return m.metrics
}
// Add adds the metricNames to the metrics set and returns a new copy with the
// additional metrics.
func (m *MetricSet) Add(metricNames ...string) *MetricSet {
newMetrics := make(map[string]bool)
for metric := range m.metrics {
newMetrics[metric] = true
}
for _, metric := range metricNames {
newMetrics[metric] = true
}
return &MetricSet{metrics: newMetrics}
}
// Join joins the metrics passed in with the metrics set, and returns a new copy
// with the merged metrics.
func (m *MetricSet) Join(metrics *MetricSet) *MetricSet {
newMetrics := make(map[string]bool)
maps.Copy(newMetrics, m.metrics)
maps.Copy(newMetrics, metrics.metrics)
return &MetricSet{metrics: newMetrics}
}
// Remove removes the metricNames from the metrics set and returns a new copy
// with the metrics removed.
func (m *MetricSet) Remove(metricNames ...string) *MetricSet {
newMetrics := make(map[string]bool)
for metric := range m.metrics {
newMetrics[metric] = true
}
for _, metric := range metricNames {
delete(newMetrics, metric)
}
return &MetricSet{metrics: newMetrics}
}
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