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// Copyright 2016 The LUCI 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 store
import (
"context"
"time"
"go.chromium.org/luci/common/tsmon/types"
)
// NewNilStore creates a metric store that completely ignores all metrics.
//
// It's setters are noop, and getters return nil.
func NewNilStore() Store {
return nilStore{}
}
// IsNilStore returns true if given Store is in fact nil-store.
func IsNilStore(s Store) bool {
_, yep := s.(nilStore)
return yep
}
type nilStore struct{}
func (nilStore) DefaultTarget() types.Target { return nil }
func (nilStore) SetDefaultTarget(t types.Target) {}
func (nilStore) Get(ctx context.Context, m types.Metric, resetTime time.Time, fieldVals []interface{}) interface{} {
return nil
}
func (nilStore) Set(ctx context.Context, m types.Metric, resetTime time.Time, fieldVals []interface{}, value interface{}) {
}
func (nilStore) Incr(ctx context.Context, m types.Metric, resetTime time.Time, fieldVals []interface{}, delta interface{}) {
}
func (nilStore) GetAll(ctx context.Context) []types.Cell {
return nil
}
func (nilStore) Reset(ctx context.Context, m types.Metric) {
}