cadvisor/storage/cache/memcache.go
2014-07-23 14:57:18 -07:00

73 lines
2.4 KiB
Go

// Copyright 2014 Google Inc. All Rights Reserved.
//
// 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 cache
import (
"github.com/google/cadvisor/info"
"github.com/google/cadvisor/storage"
"github.com/google/cadvisor/storage/memory"
)
type cachedStorageDriver struct {
maxNumStatsInCache int
maxNumSamplesInCache int
cache storage.StorageDriver
backend storage.StorageDriver
}
func (self *cachedStorageDriver) AddStats(ref info.ContainerReference, stats *info.ContainerStats) error {
err := self.cache.AddStats(ref, stats)
if err != nil {
return err
}
err = self.backend.AddStats(ref, stats)
if err != nil {
return err
}
return nil
}
func (self *cachedStorageDriver) RecentStats(containerName string, numStats int) ([]*info.ContainerStats, error) {
if numStats < self.maxNumStatsInCache {
return self.cache.RecentStats(containerName, numStats)
}
return self.backend.RecentStats(containerName, numStats)
}
func (self *cachedStorageDriver) Percentiles(containerName string, cpuUsagePercentiles []int, memUsagePercentiles []int) (*info.ContainerStatsPercentiles, error) {
return self.backend.Percentiles(containerName, cpuUsagePercentiles, memUsagePercentiles)
}
func (self *cachedStorageDriver) Samples(containerName string, numSamples int) ([]*info.ContainerStatsSample, error) {
if numSamples < self.maxNumSamplesInCache {
return self.cache.Samples(containerName, numSamples)
}
return self.backend.Samples(containerName, numSamples)
}
func (self *cachedStorageDriver) Close() error {
self.cache.Close()
return self.backend.Close()
}
func MemoryCache(maxNumSamplesInCache, maxNumStatsInCache int, driver storage.StorageDriver) storage.StorageDriver {
return &cachedStorageDriver{
maxNumStatsInCache: maxNumStatsInCache,
maxNumSamplesInCache: maxNumSamplesInCache,
cache: memory.New(maxNumSamplesInCache, maxNumStatsInCache),
backend: driver,
}
}