Initial commit based on https://github.com/minio/minio/releases/tag/RELEASE.2020-07-02T00-15-09Z

cmd/disk-cache-stats.go

@@ -0,0 +1,75 @@
+/*
+ * 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 {
+	// 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
+}
+
+// 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{}
+}