116 lines
3.1 KiB
Go
116 lines
3.1 KiB
Go
// Copyright 2014 Google Inc. All Rights Reserved.
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//
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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 container
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import (
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"fmt"
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"sync"
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"time"
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"github.com/google/cadvisor/info"
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"github.com/google/cadvisor/sampling"
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)
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type samplerFactor interface {
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String() string
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NewSampler(*StatsParameter) (sampling.Sampler, error)
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}
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type samplerManager struct {
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factoryMap map[string]samplerFactor
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lock sync.RWMutex
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}
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func (self *samplerManager) Register(factory samplerFactor) {
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self.lock.Lock()
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defer self.lock.Unlock()
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if self.factoryMap == nil {
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self.factoryMap = make(map[string]samplerFactor, 3)
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}
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self.factoryMap[factory.String()] = factory
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}
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func (self *samplerManager) NewSampler(param *StatsParameter) (sampling.Sampler, error) {
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self.lock.RLock()
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defer self.lock.RUnlock()
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if f, ok := self.factoryMap[param.Sampler]; ok {
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return f.NewSampler(param)
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}
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return nil, fmt.Errorf("unknown sampler %v", param.Sampler)
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}
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var globalSamplerManager samplerManager
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func NewSampler(param *StatsParameter) (sampling.Sampler, error) {
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return globalSamplerManager.NewSampler(param)
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}
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type reservoirSamplerFactory struct {
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}
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func (self *reservoirSamplerFactory) String() string {
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return "uniform"
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}
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func (self *reservoirSamplerFactory) NewSampler(param *StatsParameter) (sampling.Sampler, error) {
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s := sampling.NewReservoirSampler(param.NumSamples)
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if param.ResetPeriod.Seconds() > 1.0 {
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s = sampling.NewPeriodicallyResetSampler(param.ResetPeriod, s)
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}
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return s, nil
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}
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type esSamplerFactory struct {
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startTime time.Time
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}
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func (self *esSamplerFactory) String() string {
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return "weighted"
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}
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func (self *esSamplerFactory) NewSampler(param *StatsParameter) (sampling.Sampler, error) {
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s := sampling.NewESSampler(param.NumSamples, func(d interface{}) float64 {
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stats := d.(*info.ContainerStats)
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delta := self.startTime.Sub(stats.Timestamp)
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return delta.Seconds()
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})
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if param.ResetPeriod.Seconds() > 1.0 {
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s = sampling.NewPeriodicallyResetSampler(param.ResetPeriod, s)
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}
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return s, nil
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}
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type chainSamplerFactory struct {
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}
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func (self *chainSamplerFactory) String() string {
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return "window"
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}
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func (self *chainSamplerFactory) NewSampler(param *StatsParameter) (sampling.Sampler, error) {
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s := sampling.NewChainSampler(param.NumSamples, param.WindowSize)
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if param.ResetPeriod.Seconds() > 1.0 {
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s = sampling.NewPeriodicallyResetSampler(param.ResetPeriod, s)
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}
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return s, nil
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}
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func init() {
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globalSamplerManager.Register(&reservoirSamplerFactory{})
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globalSamplerManager.Register(&esSamplerFactory{time.Now()})
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globalSamplerManager.Register(&chainSamplerFactory{})
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}
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