mirror of
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102 lines
3.3 KiB
Go
102 lines
3.3 KiB
Go
// Copyright 2013 Prometheus Team
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package metric
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import (
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"github.com/prometheus/prometheus/model"
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"sort"
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"time"
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)
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var (
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// firstSupertime is the smallest valid supertime that may be seeked to.
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firstSupertime = []byte{0, 0, 0, 0, 0, 0, 0, 0}
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// lastSupertime is the largest valid supertime that may be seeked to.
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lastSupertime = []byte{127, 255, 255, 255, 255, 255, 255, 255}
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)
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// Represents the summation of all datastore queries that shall be performed to
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// extract values. Each operation mutates the state of the builder.
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type ViewRequestBuilder interface {
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GetMetricAtTime(fingerprint model.Fingerprint, time time.Time)
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GetMetricAtInterval(fingerprint model.Fingerprint, from, through time.Time, interval time.Duration)
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GetMetricRange(fingerprint model.Fingerprint, from, through time.Time)
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ScanJobs() scanJobs
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}
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// Contains the various unoptimized requests for data.
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type viewRequestBuilder struct {
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operations map[model.Fingerprint]ops
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}
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// Furnishes a ViewRequestBuilder for remarking what types of queries to perform.
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func NewViewRequestBuilder() viewRequestBuilder {
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return viewRequestBuilder{
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operations: make(map[model.Fingerprint]ops),
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}
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}
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// Gets for the given Fingerprint either the value at that time if there is an
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// match or the one or two values adjacent thereto.
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func (v viewRequestBuilder) GetMetricAtTime(fingerprint model.Fingerprint, time time.Time) {
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ops := v.operations[fingerprint]
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ops = append(ops, getValuesAtTimeOp{
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time: time,
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})
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v.operations[fingerprint] = ops
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}
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// Gets for the given Fingerprint either the value at that interval from From
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// through Through if there is an match or the one or two values adjacent
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// for each point.
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func (v viewRequestBuilder) GetMetricAtInterval(fingerprint model.Fingerprint, from, through time.Time, interval time.Duration) {
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ops := v.operations[fingerprint]
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ops = append(ops, getValuesAtIntervalOp{
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from: from,
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through: through,
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interval: interval,
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})
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v.operations[fingerprint] = ops
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}
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// Gets for the given Fingerprint either the values that occur inclusively from
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// From through Through.
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func (v viewRequestBuilder) GetMetricRange(fingerprint model.Fingerprint, from, through time.Time) {
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ops := v.operations[fingerprint]
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ops = append(ops, getValuesAlongRangeOp{
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from: from,
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through: through,
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})
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v.operations[fingerprint] = ops
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}
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// Emits the optimized scans that will occur in the data store. This
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// effectively resets the ViewRequestBuilder back to a pristine state.
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func (v viewRequestBuilder) ScanJobs() (j scanJobs) {
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for fingerprint, operations := range v.operations {
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sort.Sort(operations)
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j = append(j, scanJob{
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fingerprint: fingerprint,
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operations: optimize(operations),
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})
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delete(v.operations, fingerprint)
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}
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sort.Sort(j)
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return
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}
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