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config.go
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config.go
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// Copyright 2021 FishGoddess. 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 cachego
import (
"context"
"time"
)
const (
// noTTL means entry lives forever.
noTTL = 0
)
// config is the config of cache.
type config struct {
// mapSize is the size of map inside.
mapSize int
// segmentSize is the size of segments.
// This value will affect the performance of concurrency.
// It should be the pow of 2 (such as 64) or the segments may be uneven.
segmentSize int
// gcDuration is the duration of gc.
gcDuration time.Duration
// singleflight means cache will enable single-flight mode.
singleflight bool
}
// newDefaultConfig returns the default config of cache.
func newDefaultConfig() *config {
return &config{
mapSize: 256,
segmentSize: 256,
gcDuration: 0,
singleflight: true,
}
}
// opConfig is the config of operations.
type opConfig struct {
// ctx is the context of operation.
ctx context.Context
// ttl is the ttl of entry set to the cache in operation.
ttl time.Duration
// onMissed is the function which will be called if not nil in operation.
onMissed func(ctx context.Context) (data interface{}, err error)
// singleflight means the call of onMissed is single-flight mode.
// This is a recommended way to load data from storages to cache, however,
// it may decrease the success rate of loading data.
singleflight bool
// reload means this operation will reload data from onMissed to cache.
reload bool
}
// newDefaultGetConfig returns the default config of Get operations.
func newDefaultGetConfig() *opConfig {
return &opConfig{
ctx: context.Background(),
ttl: 10 * time.Second,
onMissed: nil,
singleflight: true,
reload: true,
}
}
// newDefaultSetConfig returns the default config of Set operations.
func newDefaultSetConfig() *opConfig {
return &opConfig{
ttl: noTTL,
}
}