prometheus/storage/metric/interface.go
2013-03-21 18:08:46 +01:00

88 lines
3 KiB
Go

// Copyright 2013 Prometheus Team
// 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 metric
import (
"github.com/prometheus/prometheus/model"
"github.com/prometheus/prometheus/storage"
"time"
)
// MetricPersistence is a system for storing metric samples in a persistence
// layer.
type MetricPersistence interface {
// A storage system may rely on external resources and thusly should be
// closed when finished.
Close() error
// Commit all pending operations, if any, since some of the storage components
// queue work on channels and operate on it in bulk.
// Flush() error
// Record a new sample in the storage layer.
AppendSample(model.Sample) error
// Record a new sample in the storage layer.
AppendSamples(model.Samples) error
// Get all of the metric fingerprints that are associated with the provided
// label set.
GetFingerprintsForLabelSet(model.LabelSet) (model.Fingerprints, error)
// Get all of the metric fingerprints that are associated for a given label
// name.
GetFingerprintsForLabelName(model.LabelName) (model.Fingerprints, error)
GetMetricForFingerprint(model.Fingerprint) (*model.Metric, error)
GetValueAtTime(model.Metric, time.Time, StalenessPolicy) (*model.Sample, error)
GetBoundaryValues(model.Metric, model.Interval, StalenessPolicy) (*model.Sample, *model.Sample, error)
GetRangeValues(model.Metric, model.Interval) (*model.SampleSet, error)
ForEachSample(IteratorsForFingerprintBuilder) (err error)
GetAllMetricNames() ([]string, error)
// Requests the storage stack to build a materialized View of the values
// contained therein.
// MakeView(builder ViewRequestBuilder, deadline time.Duration) (View, error)
}
// Describes the lenience limits for querying the materialized View.
type StalenessPolicy struct {
// Describes the inclusive limit at which individual points if requested will
// be matched and subject to interpolation.
DeltaAllowance time.Duration
}
// View provides view of the values in the datastore subject to the request of a
// preloading operation.
type View interface {
GetValueAtTime(model.Fingerprint, time.Time) []model.SamplePair
GetBoundaryValues(model.Fingerprint, model.Interval) []model.SamplePair
GetRangeValues(model.Fingerprint, model.Interval) []model.SamplePair
// Destroy this view.
Close()
}
type Series interface {
Fingerprint() model.Fingerprint
Metric() model.Metric
}
type IteratorsForFingerprintBuilder interface {
ForStream(stream stream) (storage.RecordDecoder, storage.RecordFilter, storage.RecordOperator)
}