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Copy pathdisk-cache-stats.go
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87 lines (75 loc) · 2.2 KB
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/*
* MinIO Cloud Storage, (C) 2019, 2020 MinIO, Inc.
*
* 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 cmd
import (
"sync/atomic"
)
// CacheDiskStats represents cache disk statistics
// such as current disk usage and available.
type CacheDiskStats struct {
// used cache size
UsageSize uint64
// total cache disk capacity
TotalCapacity uint64
// indicates if usage is high or low, if high value is '1', if low its '0'
UsageState int32
// indicates the current usage percentage of this cache disk
UsagePercent uint64
Dir string
}
// GetUsageLevelString gets the string representation for the usage level.
func (c *CacheDiskStats) GetUsageLevelString() (u string) {
if atomic.LoadInt32(&c.UsageState) == 0 {
return "low"
}
return "high"
}
// CacheStats - represents bytes served from cache,
// cache hits and cache misses.
type CacheStats struct {
BytesServed uint64
Hits uint64
Misses uint64
GetDiskStats func() []CacheDiskStats
}
// Increase total bytes served from cache
func (s *CacheStats) incBytesServed(n int64) {
atomic.AddUint64(&s.BytesServed, uint64(n))
}
// Increase cache hit by 1
func (s *CacheStats) incHit() {
atomic.AddUint64(&s.Hits, 1)
}
// Increase cache miss by 1
func (s *CacheStats) incMiss() {
atomic.AddUint64(&s.Misses, 1)
}
// Get total bytes served
func (s *CacheStats) getBytesServed() uint64 {
return atomic.LoadUint64(&s.BytesServed)
}
// Get total cache hits
func (s *CacheStats) getHits() uint64 {
return atomic.LoadUint64(&s.Hits)
}
// Get total cache misses
func (s *CacheStats) getMisses() uint64 {
return atomic.LoadUint64(&s.Misses)
}
// Prepare new CacheStats structure
func newCacheStats() *CacheStats {
return &CacheStats{}
}